Graco 312185U - MD2 Valve Instructions

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Graco 312185U - MD2 Valve Instructions | Manualzz

Instructions - Parts

MD2 Valve

312185U

EN

For use with disposable mixers to dispense a variety of sealants and adhesives. For professional use only.

120 psi (0.84 MPa, 8.4 bar) Maximum Air Inlet Pressure

Important Safety Instructions

Read all warnings and instructions in this manual. Save these instructions.

See page 2 for model information, including maximum working pressure and approvals.

TI9964A

2

MD2 Valve Models

Contents

MD2 Valve Models . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Component Identification . . . . . . . . . . . . . . . . . . . . 5

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 30

Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 30

MD2 Valve Models

MD2 Valves

Part No.

Maximum Working Pressure psi (MPa, bar) Description

255179

255180

255181

255182

3000 psi (20.7 MPa, 207 bar

1:1 Soft seat, adjustable snuff-back

1:1 Hard seat, non-adjustable snuff-back

Wide ratio, soft seat, adjustable snuff-back

Wide ratio, hard seat, non-adjustable snuff-back

255183 2000 psi (13.8 MPa, 138 bar) Cold spray/joint fill valve

MD2 Valve Handles

255206 120 psig (0.84 MPa, 8.4 bar) Air trigger

255208 3A @ 28 VDC Electric air actuated

255249 0.5 @ 28 VDC Electric actuated lever

Model Selection

The following table provides a summary of the MD2 dispense valves that are described in this manual.

Type

Hand held valves with internal air trigger

Hand held valve with electric switch

Wide ratio valves

Hard seats

Soft seats

Description

The internal air trigger controls the air piston that operates the MD2 valve. A pilot port can be used to control a pump motor.

The switch signals the customer’s controller to open and close the ports on the MD2 valve using a remote 4-way air control valve which is not included.

The wide ratio MD2 valve has a center injection tip. This feature is helpful with wider ratio applications, specifically when the low volume material is a much lower viscosity than the high volume material. Frequent cleaning intervals may be required to maintain the tip.

Carbide seats and hardened needles are good for abrasive materials and stall against pressure applications.

UHMWPE seals are good for precise snuff-back control.

312185U

Warnings

Warnings

The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risk. Refer back to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where applicable.

WARNING

SKIN INJECTION HAZARD

High-pressure fluid from dispense valve, hose leaks, or ruptured components will pierce skin. This may look like just a cut, but it is a serious injury that can result in amputation.

Get immediate surgical treatment.

• Do not point dispense valve at anyone or at any part of the body.

• Do not put your hand over the end of the dispense nozzle.

• Do not stop or deflect leaks with your hand, body, glove, or rag.

• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning, checking, or servicing equipment.

EQUIPMENT MISUSE HAZARD

Misuse can cause death or serious injury.

• Do not operate the unit when fatigued or under the influence of drugs or alcohol.

• Do not exceed the maximum working pressure or temperature rating of the lowest rated system component. See Technical Data in all equipment manuals.

• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about your material, request MSDS forms from distributor or retailer.

• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manufacturer’s replacement parts only.

• Do not alter or modify equipment.

• Use equipment only for its intended purpose. Call your distributor for information.

• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.

• Do not kink or over bend hoses or use hoses to pull equipment.

• Keep children and animals away from work area.

• Comply with all applicable safety regulations.

TOXIC FLUID OR FUMES HAZARD

Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or swallowed.

• Read MSDS’s to know the specific hazards of the fluids you are using.

• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.

• Always wear impervious gloves when spraying or cleaning equipment.

PERSONAL PROTECTIVE EQUIPMENT

You must wear appropriate protective equipment when operating, servicing, or when in the operating area of the equipment to help protect you from serious injury, including eye injury, inhalation of toxic fumes, burns, and hearing loss. This equipment includes but is not limited to:

• Protective eyewear

• Clothing and respirator as recommended by the fluid and solvent manufacturer

• Gloves

• Hearing protection

312185U 3

Warnings

WARNING

FIRE AND EXPLOSION HAZARD

Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent fire and explosion:

• Use equipment only in well ventilated area.

• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop cloths (potential static arc).

• Keep work area free of debris, including solvent, rags and gasoline.

• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes are present.

• Ground all equipment in the work area. See Grounding instructions.

• Use only grounded hoses.

• Hold gun firmly to side of grounded pail when triggering into pail.

• If there is static sparking or you feel a shock, stop operation immediately.

Do not use equipment until you identify and correct the problem.

• Keep a working fire extinguisher in the work area.

4 312185U

Component Identification

Component Identification

B

C

F

D

G

F IG . 1: Component Identification

Key:

A Snuff-back adjustment knob (soft seat versions only)

B 1/8 in. npt (f) air to close (O).

C 1/8 in. npt (f) air to open (I).

D 9/16 straight thread o-ring boss “B” fluid inlet (low volume)

E 9/16 straight thread o-ring boss “A” fluid inlet (high volume)

F Zerk grease fitting

G Nosepiece with 7/8-9 bell outlet

H Air cylinder

E

B

C

A

H

TI10391A

312185U 5

Features

Features

Electric Switch Valve Pneumatic Valve

1/4 in npt (f) air inlet

TI10383A

Series A handle shown

Normally open momentary contact switch

Note: The Trigger/Lever activates an electrical switch in the handle, which activates a remote 4 way solenoid valve. Bring an “OPEN” air signal to the 1/8 in. npt(f) port (I) on this side of the valve, and a “CLOSE” signal to the port (O). See

Accessories , page 23, to order fit-

tings and tubing.

Electric Actuated Lever Valve

TI10407A

The 1/8 in. npt (f) port (I) can be used to send an “ON”

signal back to a pump pilot or control. See F IG . 1.

F IG . 2: Features of the MD2 Valves

TI10409A

6 312185U

Installation

Installation

Grounding How to Use the Valve Trigger

Safety

The following grounding instructions are minimum requirements for a basic dispensing system. Your system may include other equipment or objects which must be grounded. Check your local electrical code for detailed grounding instructions for your area and type of equipment. Your system must be connected to a true-earth ground.

• Pump: ground the pump by connecting ground wire and clamp as described in your separate pump instruction manual.

• Air compressors and hydraulic power supplies: ground the equipment according to the manufacturer's recommendations.

• Fluid hoses: use only grounded fluid hoses with a maximum of 500 feet (150 m) combined hose length to ensure grounding continuity. Check the electrical resistance of your fluid hoses at least once a week.

If your hose does not have a tag on it which specifies the maximum electrical resistance, contact the hose supplier or manufacturer for the maximum electrical resistance limits, replace the hose immediately.

• Dispensing valve: ground the valve by connecting it to a properly grounded fluid hose and pump.

• Fluid supply container: ground according to your local code.

• Flammable liquids in the dispense area: must be in approved, grounded containers. Do not store more than the quantity needed for one shift.

• All solvent pails used when flushing: ground according to local code. Use only metal pails, which are conductive. Do not place the pail on a non-conductive surface, such as paper or cardboard, which interrupts the grounding continuity.

• To maintain grounding continuity when flushing or relieving pressure, hold a metal part of the valve firmly to the side of a grounded metal pail, then trigger the valve.

1.

If you are using one of the hand-held versions of the valve, lock the valve trigger safety by turning the

latch to a right angle with the gun body. See F

IG

. 3.

2. To unlock the valve trigger safety turn it parallel with the gun body.

F IG . 3

LOCKED

TI10442A

UNLOCKED

TI10441A

312185U 7

8

Setup

Setup

Fluid and Air Connections

9/16 Straight Thread O-Ring Boss Fluid

Inlets

There is one fluid inlet on the A-side and one fluid inlet on the B-side. The fluid inlets are located on the side of the valve and swivel to permit various mounting and hose configurations.

1/8 npt(f) Air Inlets

The machine mount valves and the electric switch hand-held valves have an on port (I) and off port (O), which are operated by a remote 4-way air control valve.

Use one of the two air inlets located on the bottom and on the back of the valve.

The air switch hand-held valves have a single air inlet with an internal 4-way spool which operates the air piston.

See Accessories on page 19, to order air control valves

and tubing.

Inlet Check Valves

Inlet check valves are recommended on the fluid inlets where viscosity allows. An inlet check valve prevents back-flow or crossover when the mixer is plugged or one fluid is much lower viscosity than the other. When required, a high crack pressure check valve is installed to maintain back-pressure on low viscosity fluids.

See Accessories on page 19 for a list of check valves.

Balancing the System

A proportioner is used to feed the two-component dispense valve. The system must be pressure balanced to avoid “lead-lag” ratio errors when starting and stopping the flow.

Balancing is done by hose sizing or inlet check restriction. A properly balanced system has near equal back-pressure on the gauges when flowing without a mixer installed.

Selecting Hoses

Hoses between your proportioner and the MD2 valve should be selected carefully. Many factors effect hose selection.

1.

Fluid Compatibility: Fluid must not degrade the core material or end fittings of the hose. Nylon or

PTFE cores are commonly used for chemical compatibility. If your fluid is moisture sensitive you should use PTFE or Moisture-Lok hoses.

2.

Pressure Rating: Be sure hoses have a working pressure rating above the pressure capability of the system.

3.

Compressibility: Hoses, especially nylon paint hoses, expand with an increase in pressure. A pressure change in the system may cause a volume change, which can appear as a ratio error with wide mix ratios. Compressible hoses absorb pressure spikes which is helpful to the operator during an application, such as trying to lay a bead.

4.

Internal Diameter: Small I.D.'s create higher back pressures, lower flows, and small retained volume.

Typically hose I.D.'s are selected for: a.

System Pressure Balance. “A” pressure drop vs. “B” pressure drop.

b.

Volume Balance. A:B volume ratio vs. Hose retained volume.

c.

Flexibility and weight for operator or robot.

d.

Overall Pressure Drop. Pressure drop should be minimum possible within the above guidelines.

5.

Length: Hoses normally are kept as short as practical to minimize pressure drop and compressible volume. 10 ft (3.1 m) is recommended for reciprocating pump systems.

312185U

Setup

System Start-up

When initially loading the fluids through the system, leave the mixer off until both fluids flow freely from the nose piece without any air. This prevents cross contamination from having fluid on one side pushing back up the other side.

Mixer Selection

Disposable mixers are available from 3/16 in. I.D. to 1/2 in. I.D. in lengths from 12 elements to 36 elements. In general, wide viscosity or mix ratios require more mix elements. Small I.D. mixers produce lower flow, higher back-pressure, and waste little material. Large I.D. mixers produce higher flow, lower back-pressure, and fewer lead-lag ratio errors. Different mixers can have differing snuff-back characteristics.

Setting the Amount of

Snuff-back

NOTE: For Models 255179 and 255181 only

The MD2 valves with hard seats use two snuff-back restrictor rings (13) to set the amount of snuff-back.

These two rings are trapped between the main valve body and the nose piece. When the fluid valve pulls back to close, it enters the restrictions, stops flow, and pulls the fluid back until the needle reaches its carbide seat.

Maximum snuff-back results when both restrictors are used. Some snuff-back is still achieved without the restrictors because of the pull-back action of the needles.

When dispensing wide mix ratios, it is best to use a snuff-back restrictor only on the high volume side. This keeps the high volume side from being pulled back into the low volume side.

The MD2 valves with soft seats have an adjustable snuff-back. Turn the knob on the back of the soft seat

MD2 valve to adjust the amount of snuff-back.

In general, use only as much snuff-back as necessary to give a good cut-off of flow. Too much snuff-back pulls an air bubble into the mixer. This can cause a drip, or cause the mixer to spit when the valve is re-opened.

312185U 9

Operation

Operation

Pressure Relief Procedure

• Apply and maintain air pressure to the ON (I) air port on the valve, and remove air pressure from the OFF

(O) air port on the valve to open the valve.

• Apply and maintain air pressure to the OFF (O) air port on the valve, and remove air pressure from the

ON (I) air port on the valve to close the valve.

1.

Shut off the air to the supply pumps.

2.

Close the bleed-type master air valve (required in your system).

3.

Hold a metal part of the valve firmly to the side of a grounded metal pail, and trigger the dispense valve to relieve pressure.

4.

Shut off the air to the dispense valve, if applicable.

If you suspect that the dispense needle or hose is completely clogged, or that pressure has not been fully relieved after following the steps above, very slowly loosen the hose end coupling and relieve pressure gradually, then loosen completely. Now clear the needle or hose.

Lever Actuated Valve and

Electric Switch Hand-held Valve

• Be sure the air supply lines are connected correctly to the (I) and (O) valve air ports.

• To open or close the valve and maintain the open or closed status, a minimum of 40 psi (280 kPa, 2.8

bar) air pressure must be supplied and maintained at the (I) or (O) port.

• The trigger and lever only activates the electrical switch in the handle, which turns the remote sole-

noid on and off. See page 20 for electrical diagram.

• Trigger the gun or pull the lever to turn the solenoid on. Release the trigger or lever to turn the solenoid off.

Pneumatic Hand-held Valve

The valve operation is such that it is either fully open or fully closed.

The valve is opened and closed by the internal air control valve. Trigger the gun to open the valve. Release the trigger to close the valve.

Ratio Checking

The output mix ratio of your proportioner can be checked by dispensing the two fluids separately out of the nosepiece into tared cups. The cups can then be weighed and the weights divided to get the mix ratio by weight.

Use ratio check nozzles 255247 with 15K688 retaining nut for 1:1 models, or 255245 with 15K688 retaining nut for 10:1 models to make ratio checks.

Ratio checks provide information on the ratio of an overall sample. Transient problems (soft spots) caused by starting and stopping the flow (lead-lag) may not show up in this kind of ratio check. Physical tests of the mixed fluid are the best check of correct ratio and mix quality.

Machine Mount Valve

• Be sure the air supply lines are connected correctly to the ON (I) and OFF (O) valve air ports.

• To open or close the valve and maintain the open or closed status, a minimum of 40 psi (280 kPa, 2.8

bar) air pressure must be supplied and maintained at the ON (I) or OFF (O) port.

10 312185U

Maintenance

Daily Shutdown

When you are through using the MD2 valve, the outlet to the mixer should be cleaned and protected from drying or crystallization.

1.

Remove and properly dispose of the static mixer.

2.

Dispense a shot of material into a waste container to clear any crossover in the nosepiece.

3.

Wipe the nose with a clean rag being careful not to let the materials contact each other.

4.

Install the PTFE night cap (1:1 valves - 15K652,

10:1 valves - 15K628) and retaining nut (15K688).

Preventive Maintenance

There is a grease filled secondary seal/bearing area on each valve shaft. Every 10,000 cycles, or twice each month, new grease should be flushed across this area.

To grease the valve:

1.

Remove the zerk grease fitting from each side of the front or back of the valve.

2.

Pump grease (115982) with grease gun (117792) across the valve until clean grease comes out of the other side.

3.

Reinstall the zerk grease fitting.

312185U

Maintenance

11

Troubleshooting

Troubleshooting

Problem Cause Solution

Valve does not open.

Valve does not close and leaks.

Insufficient air pressure.

Air not exhausted from the front side of air cylinder piston.

Insufficient air pressure.

Turn on air or increase air pressure.

Use 4-way, relieving type air valve.

Turn on air or increase air pressure.

Air not exhausted from the back side of air cylinder piston.

Use 4-way, relieving type air valve.

Blockage between needle and seat.

Remove and clean needle and seat.

Replace gasket (38).

Damaged or missing gasket between seat and housing (hard seat only).

Damaged or worn needle or seat.

Replace both the needle and seat.

Higher than normal back pressure.

Nose piece is clogged.

Soft spots in mixed material.

Mixer is curing.

Replace mixer.

Nose piece is clogged on one side.

Remove and clean.

System is not properly balanced.

Low flow rate.

Too little snuff-back.

High static pressures build when valve shuts off.

Snuff-back rings (13) are installed

(hard seat only).

Unscrew snuff-back adjustment needle (25) 1/4 turn at a time.

Remove and clean.

Balance system with hoses, check valves, restrictors.

Turn off proportioner pump when valve closes.

Remove snuff-back rings if they are not required for maximum snuff-back.

12 312185U

Repair

Repair

Disassembly

5.

Remove the two fluid housing screws (18) and clamps (17) from the fluid housing (14). Slide the

fluid housing (14) off of the air cylinder (2). See F IG .

5.

6.

Remove the bearings (11), bearing o-rings (36, 13), and secondary fluid seals (12, 15).

1.

Relieve all air and fluid pressure, page 10.

2.

Disconnect the valve from the system.

NOTE: In the following steps, keep the parts from the A side and B side separate to prevent cured material from forming on them.

14 15

36

13

3.

Remove the two nosepiece screws (19), and pull the nosepiece (29) away from the valve. Remove the needle seats (27) and o-rings (20) for the

255179 and 255181 models. See F IG . 4.

4.

255179 and 255181 only: use a 5/32 in. socket

(4mm) to unscrew the needle (25). If the shaft (5) spins, insert a dowel pin in the shaft hole to hold it steady, then unscrew the needle. Slide the seal (26) off the needle. Repeat for the other needle (25).

255180 and 255182 models: use a 3/32 pin punch to remove the needle, then remove the seats (27) and gaskets (28) from the inlet housing.

F IG . 5

16

11

12

2

18

17

TI9974A

F IG . 4

19

29

25

27

26

20 14

TI9972A

312185U 13

Repair

7.

Remove the retaining ring (1) from the back of the air cylinder (2). Push the two shafts (5) into the air cylinder (2) to dislodge the air cylinder cap (22). See

F IG . 6.

8.

Push the two shafts (5) to dislodge the piston (9) assembly from the air cylinder (2).

9.

Use an o-ring pick to remove the o-rings (23) and use a screwdriver to remove the sleeve bearings (7) from the air cylinder (2).

10. Remove the o-rings (6) from the piston (9) and air cylinder cap (22).

11. Remove the screw (24) and snuff-back adjustment knob (21) from the cap (22). Use an o-ring pick to remove the o-ring (23).

12. Remove the lock nuts (3), the pin (8), o-rings (4), and piston o-ring (6) from the shaft (5).

204

210

212

F IG . 7

201

24

23

22

39

2

6

1

21

4

9

6

3

214

203

202

203

213

211

205

206

TI10408A

Electric Switch Handle (if equipped)

1.

Disconnect the power from the gun.

2. The switch and cable are not repairable. Replace these parts as a complete assembly. Use kit 255463 for series A handles. Use kit 24D049 for series B handles.

3.

Loosen the relief connector (112) and remove the air valve plug (111).

4.

Remove the wire which will take the electric switch (114) and spacer (115) with it.

8

23

7

5

TI9975B

F IG . 6

Pneumatic Handle (if equipped)

1.

Remove the four screws (214). Pull the handle (205) and gasket (204) away from the air cylinder (2).

2.

Unscrew air valve plug (211) and remove spring

(213). Using a small diameter tool, push spool (202) out from front. Inspect o-rings (203).

113

116

114

115 111

112

120

101

TI10384B

104

F IG . 8

14 312185U

Repair

Reassembly

Air Cylinder Section

1.

Lubricate the shaft o-rings (23) and the bearings (7).

Insert o-rings into the air cylinder (2) and air cap

(22) cavities.See F IG . 6.

NOTE: The snuff-back adjustment knob (21), shaft o-rings (23), and screw (24) are not present in models 255180, 255182, and 255183.

2.

255179 and 255182 only: Insert the snuff-back adjustment knob (21) in the cap (22). Tighten the screw (24) on the end of the snuff-back adjustment knob (21). Torque to 25-30 in.-lb (2.8-3.4 N•m).

3.

Press the bearings (7) flush into the air cylinder housing (2) and air cap (22), trapping the o-rings

(23).

4.

Lubricate and reassemble the piston assembly: piston (9), o-ring (6), dowel pin (8), nuts (3), o-ring (4), and air cylinder shafts (5). Tighten nuts (3) to 25-30 in-lb (2.8-3.4 N•m). The shafts (5) should hang with some play to be self-aligning in the bearing.

5.

Lubricate the air cylinder (2) ID. Push the piston (9) assembly into the air cylinder.

6.

Lubricate and assemble the o-ring (6) onto cap (22).

Push cap (22) into cylinder (2).

7.

Install the outside retaining ring (1).

Fluid Section

1.

Lubricate the bearings (11), o-rings (13, 36) and seals (12, 15). Put the o-rings (13, 36) on the bearings. Carefully insert the seals (12) into the bearing recess, with the lips of the seals facing into the bearing. Insert the seals (15) into the bearing with the spring facing out of the housing. Be careful not to

damage the seal lips. See F IG . 5.

2.

Push the bearings (11) into the air cylinder (2).

3.

Grease the fluid housing (14) and install over the bearings (11). Install the clamps (17) and screws

(18). Tighten to 25-30 in-lb (2.8-3.4 N•m).

4.

For 255180 and 255182, insert the gaskets (28) and seats (27).

5.

Screw in the needle (25) and tighten it to 25-30 in.-lb

(2.8-3.4 N•m). See F IG . 4.

6.

255179 and 255181, Insert the seals (26) with the springs facing into the fluid housing (14).

7. With the “X” on the nosepiece on the same side as the “MD2” on the air cylinder, install the nosepiece

(31) with the o-rings (20), seats (27), and nosepiece screws (19). Tighten the nosepiece screws to

115-120 in-lb (14-15 N•m).

8.

255181 and 255182, Install injector tube (30) with assembly tool (48). Torque to 168-192 in-lb

(19.0-21.7 N•m).

9.

255181 and 255182, Install injector tip (47) and torque to 60-72 in-lb (6.8-8.1 N•m).

10. Remove zerk grease fitting (39). Fill grease in the grease port below until grease begins to exit where the zerk grease fitting (39) was located. Repeat for

the other zerk grease fitting (39). See F IG . 6.

Pneumatic Handle (if equipped)

1.

Liberally lubricate o-rings (203) and reassemble.

Install spool (202) and spring (213). Torque plug

(211) to 125-135 in-lb (14-15 N•m). See F IG . 7.

2.

Align the gasket (204) and dispense valve on the top of the handle (205). Torque the four screws

(214) evenly to 15-20 in-lb (1.7-2.2 N•m).

Electric Switch Handle (if equipped)

1.

Install the plunger (113) and spring (116). See F IG .

8.

2.

Insert the switch assembly (255463) while routing the ground lug (108) through the hole in the top of the handle.

3. Torque plug (111) to 125-135 in-lb (14-15 N•m).

4. Tighten the strain relief (112).

5.

Install the ground screw (110) through the lock washer (109) and ground lug (108). Torque to 15-20 in-lb (1.7-2.2 N•m).

6.

Align the dispense valve on the top of the handle

(101). Torque the four screws (120) evenly to 15-20 lb (1.7-2.2 N•m).

312185U 15

Parts

Parts

255179 and 255181

255181

47 30

29

2

16

18

1

2

19

27*

1

25*

26*

20* †

14

29

15

36

13

11

8

5

4 ❖✖

12 ✖

39

2

23

7 ❖

17

1

24

23 ❖

16

1 Torque to 25-30 in-lb (2.8-3.4 N•m).

2 Torque to115-120 in-lb (14-15 N•m).

9

6

3

1

22

6

1

TI21240A

21

312185U

Parts

MD2 Valve

The parts listed below are common to all MD2 Dispense valves. Parts which vary are found in the table at the bottom of this page.

Ref Part Description

1 120762 RING, retainer

2 24X839 KIT, housing, air cylinder

3 102920 NUT, lock

4

❖✖

157628 O-RING, buna-n

5 ✖ 15K421 SHAFT, primary

6

156593 O-RING, buna-n

7 ❖ 551181 BEARING, sleeve 1/4, 3/8, 1/4, nylon

8

9

551183 PIN, dowel 1/8 x 1.25 18-8 sst

626067 PISTON, air cylinder

11 15K422 BEARING, seal

12 ✖ 551191 PACKING, u-cup, nitrile

13

113746 O-RING

14 15K441 HOUSING, inlet

15

120768 SEAL, UHMWPE

16 15K442 SPACER, valve

17 15K444 CLAMP, adapter, inlet

18 121224 SCREW, cap, socket head, M5 x

0.8 x 8 mm

Qty

2

2

2

2

1

1

2

2

2

2

2

2

2

2

2

1

1

Ref Part Description

19 107530 SCREW, cap, socket head, high strength

20 *† 117517 O-RING, fluoroelastomer

32 15K688 NUT, mixer; not shown

33 104765 PLUG, pipe, headless; not shown

36 ✖ 118594 O-RING, fluoroelastomer

38 551189 LUBRICANT, grease 3 oz. cartridge; not shown

39 120892 FITTING, grease

Qty

2

4

2

2

2

1

1

Parts included in Valve Air Cylinder Repair Kit

255217 (purchase separately).

Parts included in Valve Lube Seal Repair Kit 255218

(purchase separately).

* Parts included in Front Valve Repair Kit 255219 (purchase separately).

† Parts included in Front Valve Repair Kit 255220 (purchase separately).

Ref.

No.

Description

21

25

26

KNOB, snuff-back, adjust

22a CAP, air cylinder, snuff-back

23 O-RING, buna-n

24 STOP, snuff-back

NEEDLE, snuff-back

SEAL, UHMWPE

27

29

30

31

SEAT, needle

HOUSING, nose

TUBE, injector, sst

CAP; not shown

40 ADAPTER, ratio check

47 TIP, injector

48 TOOL, assembly aid; not shown

1:1

255179

15K419

15K420

156454

15V627

* 15K428

* 120784

* 15K460

15K445

15K652

255247

10:1

255181

15K419

15K420

156454

15V627

* 15K428

* 120784

* 15K460

15K649

15V624

15V628

256794

15V623

256793

2

1

2

2

3

1

1

1

1

2

1

1

1

Qty

312185U 17

Parts

255180, 255182, and 255183

255182

47 30

29

29

16

2 18

1

15

36

13

11

12 ✖

2

19

25 †

27 †

26 †

28 †

20* †

14

8

5

4 ❖✖

39

2

23

7 ❖

17

18

1 Torque to 25-30 in-lb (2.8-3.4 N•m).

2 Torque to115-120 in-lb (14-15 N•m).

9

6

3

1

22

6

1

TI21241A

312185U

Parts

MD2 Valve

The parts listed below are common to all MD2 Dispense valves. Parts which vary are found in the table at the bottom of this page.

Ref Part Description

1 120762 RING, retainer

2 24X840 KIT, housing, air cylinder

3 102920 NUT, lock

4

❖✖

157628 O-RING, buna-n

5 ✖ 15K421 SHAFT, primary

6

156593 O-RING, buna-n

7 ❖ 551181 BEARING, sleeve 1/4, 3/8, 1/4, nylon

8

9

551183 PIN, dowel 1/8 x 1.25 18-8 sst

626067 PISTON, air cylinder

11 15K422 BEARING, seal

12 ✖ 551191 PACKING, u-cup, nitrile

13

113746 O-RING

14 15K441 HOUSING, inlet

15

120768 SEAL, UHMWPE

16 15K442 SPACER, valve

17 15K444 CLAMP, adapter, inlet

18 121224 SCREW, cap, socket head, M5 x

0.8 x 8 mm

Qty

2

2

2

2

1

1

2

2

2

2

2

2

2

2

2

1

1

Ref.

No.

Description

22 CAP, air cylinder

23 O-RING, buna-n

25 NEEDLE, snuff-back

26

27

SEAL, UHMWPE

SEAT, needle

28

29

30

31

GASKET, seat

HOUSING, nose

TUBE, injector, sst

CAP; not shown

40 ADAPTER, ratio check

47 TIP, injector

48 TOOL, assembly aid

1:1

255180

15K447

156454

† 626062

† 185467

† 626060

† 171860

15K445

15K652

255247

Ref Part Description

19 107530 SCREW, high strength

20 *† 117517 O-RING, fluoroelastomer

32 15K688 NUT, mixer; not shown

33 104765 PLUG, pipe, headless; not shown

36 ✖ 118594 O-RING, fluoroelastomer

38 551189 LUBRICANT, grease 3 oz. cartridge; not shown

39 120892 FITTING, grease

42 299518 CAP, plug; not shown

Qty

2

2

1

2

2

1

4

2

❖ Parts included in Valve Air Cylinder Repair Kit

255217 (purchase separately).

✖ Parts included in Valve Lube Seal Repair Kit 255218

(purchase separately).

* Parts included in Front Valve Repair Kit 255219 (purchase separately).

† Parts included in Front Valve Repair Kit 255220 (purchase separately).

1:1

255183

15K447

156454

† 626062

† 185467

† 171860

16T648

15V624

15K652

255247

10:1

255182

15K447

156454

† 626062

† 185467

† 626060

† 171860

15K649

15V624

15V628

24P850

15V623

256793

1

1

2

2

2

1

1

1

2

2

1

2

Qty

312185U 19

Parts

Electric Switch Handle, 255208

NOTE: Extension cable 123660 is available.

1

106

104

1 105

TI10384B

Series B handle shown

Ref Part Description Qty

101 15K666 HANDLE, 2K, dispense valve, electric

104 15B209 TRIGGER, gun

105 192272 PIN, pivot

106 203953 SCREW, cap, hex hd, 10-24

111*

112*

UNC-3A x 3/8

PLUG, air valve

CONNECTOR, relief 1/4 npt

113 15K668 PLUNGER, trigger, 2K handle

114* SWITCH, elect mini snap action

115* SPACER, switch

116 551396 SPRING, 0.26X, 0.37X, 0.51 music

119* wire

CABLE, trigger, female, 3-pin connector (Series A Handles Only)

CABLE, trigger, male, 4-pin connector (Series B Handles Only)

120 117026 SCREW, cap, sch, M5 x 0.80 x

12 mm

1

1

1

4

* Parts included in Series A Handles Kit 255463 and

Series B Handles Kit 24D049 (purchase separately).

1

1

1

1

1

1

1

1

1

20

120

113

116

114*

115*

111*

2

112*

119*

101

TI14761A

1 Torque to 25 in-lb (2.8 N•m).

2 Torque to 125-135 in-lb (14-15 N•m).

312185U

Parts

Pneumatic Handle, 255206

204

216

4 210

202

203

2

214

203

2

213

211

3

215

3

212

3

201

207

205

206

1

TI21242A

Ref Part Description Qty

201 100721 PLUG, pipe 1

202 15B202 VALVE, spool

203* O-RING, chemically resistant fluorocarbon

1

3

204 15K661 GASKET, handle

205 15K658 HANDLE, 2K dispense valve, air

206 119626 PLUG, breather

207 192272 PIN, pivot

1

1

1

1

210 203953 SCREW, cap hex hd, 10-24 UNC-3A x 3/8 1

211 15B208 PLUG, air valve, 1/4 npt 1

212 15B209 TRIGGER, gun

213 117485 SPRING, compression

1

1

214 117026 SCREW, cap, sch, M5 x 0.80 x 12 mm

215 117509 COUPLER, line, air, 1/4 npt

216 117510 FITTING, line, air, 1/4 npt

4

1

1

* Parts included in Kit 246354 (purchase separately).

1 Torque to 35 in-lb (4 N•m).

2 Apply lubricant on seals.

3 Apply thread sealant. Torque to 130 in-lb (15 N•m).

4 Torque to 25 in-lb (2.8 N•m).

312185U 21

Parts

Actuated Lever, 255249

302

307

305

1

319

303

304

308

310

301

306

1

303

309

1 Torque to 25 in-lb (2.8 N•m).

TI10410B

Ref Part Description

301 15K922 BLOCK, mounting lever, 2K

302 121191 BOLT, eye, 1/4-20 x 2 in. (51 mm)

303 100015 NUT, hex, 1/4-20 UNC 2-B

304 100016 WASHER, lock

305 192272 PIN, pivot

306 203953 SCREW, cap, hex, hd

307 551318 CONNECTOR, relief, 1/4 npt

308 121192 SWITCH, pushbutton

309 121193 PLUNGER, spring, 1/4-20

310 15M479 LEVER, actuator, valve

311 121194 SCREW, socket head cap, M5 - 0.8 x

30 mm (not shown)

319 123619 CABLE, trigger

Qty

1

1

1

1

1

1

2

1

4

1

1

1

22 312185U

Accessories

Accessories

Plastic Tube Fittings to Connect Air Signals

Tube OD

5/32 in.

1/4 in.

Tube OD

5/32 in.

1/4 in.

1/8 NPT (M) Straight

114263

115671

1/4 NPT (M) Straight

598252

104165

1/8 NPT (M) 90° Swivel

114151

112698

1/4 NPT (M) 90° Swivel

114469

114109

Inlet Check Valves (3000 psi working pressure)

Part No.

501867

501684

949709

949710

Size

1/4 NPT (M x M)

3/8 NPT (M x M)

3/8 NPT (M x M)

3/8 NPT (M x M)

Description

303 sst with PTFE o-ring poppet (2 psi crack pressure).

303 sst with PTFE o-ring poppet (2 psi crack pressure).

Carbon steel carbide seat (50 psi crack pressure).

Carbon steel carbide seat (100 psi crack pressure).

Catalyst Injectors

Catalyst injectors are restrictive check valves which are often used to create back pressure on the catalyst side inlet to the MD2 valve. Catalyst injectors are also used to balance pressures and flow on wide-ratio, low-viscosity catalyst applications.

Injector No.

948291

948258

947937

570251

Size Code

#125

#35

#40

#42

Bore Dia.

0.125 in.

0.110 in.

0.098 in.

0.0935 in.

Needle Dia.

0.086 in.

0.086 in.

0.086 in.

0.086 in.

Typical

Application

Viscosity

500-50,000 cps

1000-10,000 cps

200-1,500 cps

50-800 cps

Typical Used

Sealant*

Polysulfide

Silicone

Urethane

Urethane

* Wide ratio applications 8:1 to 13:1 by volume.

** Injectors have a “snout” and must be screwed into a 1/4 npt(f) female coupling. Inlet is 1/4 npt(f).

312185U 23

Accessories

Plastic Tubing for Air Signal Lines

Part No.

Description

514607

C12509

5/32 in. O.D. Nylon

1/4 in. O.D. Nylon

Mixers and Shroud

ID x # elements 50 pack 250 pack

3/16 x 32

1/4 x 24

3/8 x 24

3/8 x 36

LC0077

LC0078

LC0079

LC0080

3/8 Combo LC0081

3/16 x 32 Luer Lock LC0082

1/4 x 24 Luer Lock LC0083

*Mixers can be trimmed as needed.

LC0084

LC0085

LC0086

LC0087

LC0088

LC0089

LC0090

Shroud

LC0063

LC0057

LC0058

LC0059

LC0060

LC0061

LC0062

Nose Piece Accessories

Part No.

15K652

15V628

255247

24P850

258687

256793

15K688

Description Notes

1:1 nightcap

10:1 nightcap

PTFE cap to protect the 1:1 outlet when not in use

PTFE cap to protect the 10:1 outlet when not in use

1:1 ratio check nozzle Splits the flow on 1:1 valves to facilitate ratio checks

10:1 ratio check nozzle Splits the flow on 10:1 valves to facilitate ratio checks

10:1 check tip

Tool

7/8-9 retaining nut

Assembly for low volume side material that is very thin

Assembly tool to aid in the installation and removal of injector tube 15V623

Use to hold 15K652, 255247 and 255245 on to valve

24 312185U

Accessories

Orifice Kits

In the following table, shaded rows indicate “Super Standard” items that are typically stocked and provide the best delivery dates.

Impingement

Port Size in.

mm

Kit Type and Kit Number

250 Model Polyol

Orifice Kit

250 Model Iso

Orifice Kit

Impingement

Port Size in.

mm

Kit Type and Kit Number

250 Model Polyol

Orifice Kit

250 Model Iso

Orifice Kit

0.016

0.41

24C805 24D229

0.047

1.19

24C753 24D225

0.020

0.51

24C751 24D223

0.052

1.32

24C811 24D235

0.024

0.61

24C806 24D230

0.055

1.40

24C812 24D236

0.028

0.71

24C807 24D231

0.060

1.52

24C754 24D226

0.031

0.79

24C752 24D224

0.063

1.60

24C813 24D237

0.035

0.89

24C808 24D232

0.067

1.70

24C755 24D227

0.039

0.99

24C809 24D233

0.073

1.85

24C815 24D238

0.042

1.07

24C810 24D234

0.086

2.18

24C756 24D228

Orifice Kit

504

503

502

501

4

505

3

3

507

3

506

509 ti21829a2

3 Apply a light coating of lubricant to seals and surfaces specified.

4 Fasten stem (505) into housing (501). Fasten cap (509) onto housing (501) and torque to 60-70 in-lb

(6.8-7.9 N•m). Unscrew stem (505) until it bottoms out against cap (509).

Ref.

Part

501 ---

502†‡ ---

503† ---

504† ◆ ---

505 ---

506† ---

507† ---

509 ---

510 ---

Description

HOUSING, orifice

O-RING, 0.63 in. diameter

O-RING, 0.44 in. diameter

O-RING, 0.37 in. diameter

STEM, valve

RING, backup, PTFE

O-RING, 0.28 in. diameter

CAP, orifice

TOOL, cleanout; #78 drill bit (not shown)

Qty.

1

1

1

1

1

1

1

1

1

† Parts included in kit 24D321.

‡ Parts included in kit 248130 (pack of 6).

◆ Part included in kit 248128 (pack of 6).

312185U 25

Accessories

24E505 Orifice Block Kit

Part 122737, Swivel Adapter - JIC 6 x 1/4 npt, not included in kit

Part 122961, Swivel Adapter - JIC 5 x 1/4 npt, not included in kit

401

MD2 Valve not included

401d

401b

401c

401a

1

Lubricate all o-rings and specified surfaces.

2

Torque to 20-30 in-lb (2.2-3.4 N•m).

Ref.

Part Description

401 HOUSING, orifice, assy;

401a

401b includes 401a-401d

HOUSING, orifice

WASHER

401c NUT

401d 123886 O-RING

402 KIT, orifice block plug; includes

402a

402a and 402b

PLUG, orifice

402b 117724 O-RING

Qty.

1

1

1

1

1

1

1

1

24E505 does not include an MD2 valve. See

MD2

Valve Models on page 2.

24E505 does not include swivel adapters. Swivel adapters 122961 and 122737 must be purchased separately.

See manual 3A0861 for ratio check assembly

24F227.

26

402b

402a 1 2 ti21829a1

312185U

Accessories

Valve Accessories

551351 Short Throw Spacer

A spacer under the air piston that limits how far the fluid needles push open. It reduces the amount of material surge when the valve opens, and reduces the amount of snuff-back available. Used for dispensing low flow small diameter beads. For 255180 and 255182 only.

123660 Extension Cable, 6.0 m (19.7 ft)

For locating the valve further from the base system than allowed with the original cable provided. For use with the electric handle 255208 and actuated lever 255249.

Conversion Kits

Part No.

255206

Description

Pneumatic Handle

255208

255249

255273

123902

Electric Handle

Electric Lever Switch

Hanger Adapter

Cable

Notes

Convert any valve to a hand held valve with an internal pneumatic 4-way valve. See page

21 .

Convert any valve to a hand held valve with an internal normally open switch. See page

20 .

Convert any valve to a hanging valve with an internal normally open switch. See page

22 .

Add to any hand held valve to allow it to be hung.

Replaces trigger cable included with electric handle 255208 and actuated lever 255249. For converting handle/lever to connect to systems previously connected to a TwinMixer

® gun. Use pins 1 (brown) and 3 (blue).

Hanger Adapter

255273

TI10512A

312185U 27

Accessories

Front Valve Repair Kits

Part No.

255219

255220

Description

Repair Kit for adjustable snuff-back valves 255179 and

255181 only.

Repair Kit for non-adjustable snuff-back valves 255180,

255182, and 255183 only.

G 1/2 Outlet Kit

Part No.

16T802

Description

Adapter to allow for the mounting of G 1/2 threaded mixers. Applicable for 10:1 MD2 valves only.

Angled Adapter Kits

24W045 - 25° angle

24W046 - 15° angle

24W047 - 5° angle

Ref.

Part Description

601 17B515 25° adapter block

17B516 15° adapter block

17B517 5° adapter block

602 15K661 GASKET, handle 2

603 117026 SCREW, socket head, M5x12 8

Qty.

1

1

1

602

603

601

602 x o r_16t802

28 312185U

Technical Data

Technical Data

Maximum Fluid Pressure

Maximum Cylinder Air Pressure

Air Inlets (open (I) and close (O) ports)

Fluid Inlets

Fluid Outlet

Fluid Viscosity Range

Soft Seats

Hard Seats

Fluid Section Sealing

Divorced Air Cylinder

Weight

255179 / 255180 (1:1 valves)

255181 / 255182 (10:1 valves)

255206 (pneumatic handle)

255208 (electric handle)

255249 (electric lever)

Wetted Parts

Stainless Steel Valve

255179-255182: 3000 psi (20.7 MPa, 207 bar)

255183: 2000 psi (13.8 MPa, 138 bar)

120 psi (0.84 MPa, 8.4 bar)

1/8 npt(f)

9/16 straight thread o-ring boss “A” and “B”

7/8-9 bell outlet

1-1 million cps

20-1 million cps

Isolation chamber with zerk fittings and dual seals.

Double acting, buna-n o-rings

1.45 lb (0.66 kg)

1.50 lb (0.68 kg)

0.85 lb (0.39 kg)

0.90 lb (0.41 kg)

0.75 lb (0.34 kg)

303 sst, 17-4 SS, UHMWPE, PEEK, Chemical Resistant o-rings. 440C SS and C2 carbide with cobalt binder (hard seat only)

Dimensions

0.28 in. (7.1 mm)

M5 x 0.8 mounting holes (2)

1.06 in. (26.9 mm)

M5 x 0.8 mounting holes (4)

312185U

TI9977A

TI10654A

29

Graco Standard Warranty

Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale to the original purchaser for use. With the exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by

Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco’s written recommendations.

This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of Graco equipment with structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or maintenance of structures, accessories, equipment or materials not supplied by Graco.

This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in material or workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and transportation.

THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT

LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE .

Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other remedy

(including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the date of sale.

GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE, IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD BUT NOT

MANUFACTURED BY GRACO . These items sold, but not manufactured by Graco (such as electric motors, switches, hose, etc.), are subject to the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in making any claim for breach of these warranties.

In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder, or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract, breach of warranty, the negligence of Graco, or otherwise.

FOR GRACO CANADA CUSTOMERS

The Parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnaissent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires exécutés, donnés ou intentés, à la suite de ou en rapport, directement ou indirectement, avec les procédures concernées.

Graco Information

For the latest information about Graco products, visit www.graco.com

.

For patent information, see www.graco.com/patents

.

TO PLACE AN ORDER, contact your Graco distributor or call to identify the nearest distributor.

Phone: 612-623-6921 or Toll Free: 1-800-328-0211 Fax: 612-378-3505

All written and visual data contained in this document reflects the latest product information available at the time of publication.

Graco reserves the right to make changes at any time without notice.

Original instructions.

This manual contains English. MM 312185

Graco Headquarters: Minneapolis

International Offices: Belgium, China, Japan, Korea

GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA

Copyright 2001, Graco Inc. All Graco manufacturing locations are registered to ISO 9001.

www.graco.com

Revision U, January 2017

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