Marwin UT IOM

Marwin UT IOM
I & M UT Series (2003 Design)
Installation & Maintenance Instructions for
Marwin UT Series Actuators
UT-0 thru UT-4.5 (2003 Design)
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.marwinvalve.com
Warning: Marwin Valve Ball Valves must only be used, installed and repaired in accordance with these Installation &
Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event of leakage
or other malfunction, call a qualified service person; continued operation may cause system failure or a general hazard.
Please read these instructions carefully!
Your Marwin Valve product will provide you with long, trouble-free service if it is correctly installed and maintained.
Spending a few minutes now reading these instructions can save hours of trouble and downtime later. When making
repairs, use only genuine Marwin Valve parts, available for immediate shipment from the factory.
Scope
This manual is intended as a guide to assist customers in the storage, installation, and maintenance of Marwin UT Series Pneumatic Actuators UT-0 thru UT-4.5 ~ 2003 Design. See photo on back page for further identification.
Main Characteristics
 Maximum Air Supply: 116 psi (8 bar)
 Supply: Dry air (STANDARD). Other fluids or gases are possible if compatible with actuator materials.
 Temperature: From -4°F to +185°F (-20°C to +85°C) for standard version with NBR seals.


From -4°F to +302°F (-20°C to +150°C)) for HIGH TEMP version (Viton seals).
From -40°F to +185°F (-40°C to +85°C) for LOW TEMP version.
Rotation: 90° stroke with regulation +/-5° for open and closed position (double adjustment). Upon request full
stroke regulation 0° / 90°.
Lubrication: during assembly, for the actuator life.
Operating Principle
The Marwin UT pneumatic actuator is a quarter-turn rack and pinion type that transforms the linear motion of the pistons (11), due to the thrust caused by the pressure on the surface area, to a 90° rotary motion of the pinion (2).
Double Acting
CLOSED
11
2
OPEN
2
11
F
F1
F
F1
P1
IN
AIR
P2
11
Pressurizing the left or bottom air port (P1) fills the external chambers. The action of the pressure on the surface
of the pistons (11) creates a force (F) that pushes them
toward the pinion, generating a torque with CLOCKWISE
ROTATION.
IN
AIR
11
Pressurizing the right or top air port (P2) fills the internal
chamber. The action of the pressure on the surface of
the pistons (11) creates a force (F1) that pushes them
toward the end caps, generating a torque with COUNTERCLOCKWISE ROTATION.
Spring Return
M
11
2
M
M
OPEN
11
2
M
CLOSED
Fm
F1
F1
Fm
P2
IN
AIR
11
11
When the pistons (11) are next to the pinion (2) (springs
(M) uncompressed), pressurizing the right or top air port
(P2) fills the internal chamber. The action of the pressure
on the surface of the pistons creates a force (F1) that
pushes them toward the end caps, generating a torque
with COUNTERCLOCKWISE ROTATION.
When the pistons (11) are next to the end caps (springs
(M) compressed), de-pressurizing air port P2, allows the
springs to uncompress. The spring force (Fm) pushes
the pistons toward the pinion, generating a torque with
CLOCKWISE ROTATION.
Storage
For applications where the actuator is not put into immediate service, it is recommended that the actuator be kept in
a clean and dry location with ample protection from the environment. For unmounted actuators, the original packing
box helps in optimizing the storage.
For a long storage period, we recommend periodically pressurizing the chambers to completely cycle the actuator.
The actuators have two air ports, which should be plugged during storage to avoid any intrusion.
Maintenance
The lubrication used during the assembly of the actuator, and the self-lubricating material used in the guides, gives
a life of one million cycles for normal working conditions. When replacing worn seals, it is recommended that the
guides be replaced as well to ensure best actuator performance.
Disassembly
1.
2.
3.
4.
Disconnect all pneumatic and electrical supplies from the actuator.
Remove any accessory from the actuator that could be damaged.
Remove actuator from valve (noting the valve position, actuator position, and actuator orientation on the valve
for correct reinstallation).
Place the actuator on a support with the same male drive of the pinion female connection, in order to easily execute the following steps:
Support
-2-
5.
Before starting the disassembly, verify by the stamped marking on the body if the actuator is double acting (DA)
or spring return (SR).
For DOUBLE ACTING actuator:
6.
Slowly remove the end caps screws (22) from each end cap (19,20) using a diagonal pattern.
FOR SPRING RETURN actuator:
7.
8.
9.
10.
11.
12.
13.
Slowly disengage the bolts (20) part way from each end cap (18 and 19), to allow the springs to fully uncompress. Unscrew the bolts 0.38" to 0.5" at a time in a diagonal patter, and repeat the sequency until the springs
are fully uncompressed.
Remove the end caps (19,20).
Remove the snap ring (10) from its place on the pinion (2).
Remove pinion washer (9).
Remove the cam (7) and spacer ring (6).
Rotate the actuator body (1) in a clockwise direction in respect to the pinion (2), so that the pistons move towards body ends. Now it is possible to remove the two pistons.
Carefully remove pinion (2) from the body (1).
Actuator Parts
10
17
18
20
21
13
8
9
12
11
7
22
6
14
13
11
12
14
16
5
1
4
2
21
22
19
3
15
18
17
Spring Setting
Set
External Spring
Internal Spring
Air Supply, psi/(bar)
01
1
1
36 - 44 / (2.5 - 3)
02
2
0
44 - 58 (3 - 4)
03
1
2
58 - 73 (4 - 5)
04
2
1
73 - 80 (5 - 5.5)
05
2
2
80 - 87 (5.5 - 6)
Material Specifications - UT-0 thru UT-4.5
Description
Material
Treatment
Qty. DA
Qty. SR
1
Item
Body
Extruded Aluminum
Hard Anodized
1
1
2
Anti-Blowout Pinion
Steel
Nickel Plated
1
1
3*
(R)
Lower Pinion O-Ring
NBR
1
1
4*
(R)
Pinion Spacer Ring
POM Acetalyc Copolymer
1
1
5*
(R)
Top Pinion O-Ring
NBR
1
1
6*
(R)
Cam Spacer Ring
POM Acetalyc Copolymer
1
1
7
Cam
Stainless Steel
1
1
8
Position Indicator
Nylon
2
2
9
1
1
1
1
Die Cast Aluminum
2
2
Piston O-Ring
NBR
2
2
13* (R)
Anti-Friction Ring
POM Acetalyc Copolymer
2
2
14* (R)
Piston Thrust Block
POM Acetalyc Copolymer
2
2
Stop Bolt Retaining Nut
Stainless Steel
2
2
16
Stop Bolt
Stainless Steel
2
2
17
External Spring
Steel
Zinc Phosphate
0
18
Internal Spring
Steel
Zinc Phosphate
0
See Spring
Chart
19
Left End Cap
Die Cast Aluminum
Painted
1
1
20
Right End Cap
Die Cast Aluminum
Painted
1
1
End Cap Gasket
NBR
2
2
End Cap Fixing Bolt
Stainless Steel
8
8
10
(R)
Pinion Washer
Stainless Steel
Pinion Snap Ring
Steel
Piston
11
12* (R)
15
21
22
(R)
* Parts subject to wear.
Nickel Plated
(R) Repair Kit Item.
Assembly
1.
2.
3.
4.
Clean the components before proceeding with the assembly.
Lightly grease the internal chamber of the body (1) and the seals on the pistons. We suggest the use of an extreme pressure lithium based grease such as Kluber Centoplex 2 EP.
Carefully insert the pinion (2) into the body (1), so that the two pinion flat surfaces are parallel to the axis of the
body.
Insert the pistons (pre assembled and greased) into the body as shown here below.
Assembly Possibilities - Top View
Closed
Open
Open
Closed
A
B
Counterclockwise Rotation (Standard)
Clockwise Rotation (Reversed Pistons)
-4-
5.
6.
7.
Push the pistons (11) into the body (1) until the piston teeth are stopped by the teeth of the pinion (2).
Keeping a soft pressure with the hands on the pistons (11), rotate the body (1) in clockwise rotation in respect
to the pinion (2) until feeling two clicks, when the pistons engage with the pinion (2).
Now rotate the body (1) in counterclockwise rotation, and verify that at the end of the rotation the two pinion
flat surfaces are about 7° rotated to the axis of the body.
Note: Correct assembly gives symmetric stroke of the pistons, which can be verified by measuring distance
from each end face of the body. These distances should be equal.
8.
9.
Assemble the cam spacer ring (6) and the cam (7).
Assemble the pinion washer (9) and insert the snap ring (10) in its place on the pinion (2). NOTE: Use snap
rings with reinforced thickness DIN 471 - UNI 7436.
10. Proceed making the adjustment of the stroke, acting on adjusting screws (16), fixing their position securing the
nuts (15).
FOR DOUBLE ACTING ACTUATORS
11. Assemble the end caps (19,20) to the body (1) with the screws (22), using a diagonal bolting pattern.
FOR SPRING RETURN ACTUATORS
12. With the pistons in the CLOSED position, insert the springs in spring set (M) into the body (1), putting them
in the piston (11) recess. Then assemble the end cap (19) on the springs. Center the end cap recess on the
springs. Assemble the screws (22), using a diagonal bolting pattern to tighten each screw a little at a time, so
that the springs are uniformly compressed, until end cap (19) is completely closed.
13. Repeat the operation on the other side.
14. Operate the actuator to verify the correct functioning before re-installing it.
Stroke Adjustment
The left stop bolt adjusts the OPEN valve position for STANDARD (direct) rotation, and the closed valve position for
reverse rotation.
-5-
The right stop bolt adjusts the CLOSED valve position for STANDARD (direct) rotation, and the open valve position
for reverse rotation.
Stroke adjustment procedure (when pistons are in open position):
 Remove air supply or move the pistons to the closed position.
 Adjust the corresponding stop bolt.
 Move the pistons to the open position and verify the new adjustment.
 Repeat this operation until desired adjustment is achieved.
Stroke adjustment procedure (when pistons are in closed position):
 Remove air supply or move the pistons to the open position (necessary for SR).
 Adjust the corresponding stop bolt.
 Move the pistons to the closed position and verify the new adjustment.
 Repeat this operation until desired adjustment is achieved.
2003 versus Pre-2003 Design
Pre 2003 Design
UT-0 Shown
Representative of:
 All UT actuators 0A thru 7 (32-270mm bore) prior to 2003
 UT-0A, and UT-5 thru 7 (32 & 160-270mm bore) only after 2003
2003 Design
UT-0 Shown
Representative of:
 UT Actuators 0 thru 4.5 (52-140mm bore) after 2003
Bulletin IM-UT(2003Design)-1211
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.marwinvalve.com
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