PA VB 450-200 Quick Start Manual

Latest Update: 20/04/2018

VB 450-200/300

- Unloader Valve

Technical Booklet:

E 258

Pressure regulating unloader valve.

It bypasses water flow at low pressure when gun shuts off.

DN 32



60.4020.00

VB 450/200 1”1/4 Bsp FF



60.4030.00

VB 450/300 1”1/4 Bsp FF

-Intended for use with high flow rates

-Special steel spring with superior mechanical features, to maintain calibration settings for longer

-Check valve specifically designed to prevent jammings

-Screw/Locknut adjusment to set maximum pressure level

-Dynamic seals with O-ring and sliding gasket

-Fixing screw slots

P/N RATED

PRESSURE bar - MPa

Technical Data

Max. Flow Rate: 450 l/min. Max. Temperature: 90°C (1)

PERMISSIBLE

PRESSURE bar - MPa

MIN.

ADJUSTABLE

PRESSURE bar - MPa

(2)MAX PRESS.

INCREASE AT

SYSTEM SHUT

OFF

%

(3)PRESSURE

DROP AT

BYPASS

RESET

%

INLET

OUTLET

BYPASS WEIGHT g

60.4020.00 200 - 20

60.4030.00 300 - 30

220 - 22

330 - 33

20 - 2

30 - 3

10,7%

7,8%

43,8%

43,3%

1“1/4 Bsp FF 1“1/2 Bsp F

1“1/4 Bsp FF 1“1/2 Bsp F

5950

6025

(1) The valve is especially designed for a constant use at a water temperature of 60°C. It can withstand up to a max. temperature of 90°C for short intervals only.

(2) The max. pressure increase at system shut off is a percent value of calibration pressure. When it occurs, the valve is set in operation and the whole fluid is diverted into bybass.

(3) The pressure decrease at bypass reset is a percent value of calibration pressure. It indicates the pressure drop required for the valve to restore pressure in the system. n. 12.9258.00 Instruction, Maintenance, Installation, Spare Parts Booklet.

For a correct use of the item, please follow the instructions.

Please copy all relevant information on the use and maintenance booklet of the machine.

1

DIMENSIONAL DRAWING

Latest Update: 20/04/2018

INSTRUCTIONS

SELECTION

This product is to be used with clean, fresh water, or water slightly additivated with ordinary detergents. For use involving harsh or even corrosive fluids, always ask PA Technical department first. Appropriate filtration should be installed when using unclean fluids.

To select the right valve, always take in consideration rated running data of the system (rated pressure, max. flow rate and max. temperature). In no case shall the system pressure exceed the permissible pressure marked on the valve.

INSTALLATION

On a water heating machine, fit the valve before the heat generator . This product is bound to be incorporated on a finished machine.

On a water heater, it is necessary to mount accessories that limit the accidental increase of fluid temperature.

Always install a safety valve to protect the pressurized outlet channel.

Select the right nozzle size, which allows a regular discharge into bypass of at least 5% of the total flow rate of the system. This will keep a constant pressure setting and prevent pressure spikes at shut off which could damage the system.

By nozzle wearout, the pressure drops. When replacing the nozzle, reset the system to the original pressure level.

OPERATION

The valve regulates the max. system pressure through a piston, which acts on a cone that, normally positioned, closes the bypass opening. A check valve cuts out the delivery section, the pressure of which controls the piston drive.

All adjustments should be carried out when the system is in operation and the nozzle is working.

IMPORTANT: The nut (pos.15) must never be removed, as it is a mechanical safety device that limits the max pressure and prevents serious damage to persons and things.

DISCHARGE SYSTEM AND WATER ADDUCTION

The bypass conduct shall discharge outside of the machine or into a tank, but never directly into intake conduct. In case, it is advisable to install a baffled tank.

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Latest Update: 20/04/2018

PROBLEM HANDLING: CAUSES AND SOLUTIONS

PROBLEMS

Valve recycles frequently

Valve does not reach desired pressure level

PROBABLE CAUSES

Check Valve O-ring worn out

Leaking couplings

Bypass blocked or throttled

Piston seals worn out

Material matter between seat and shutter

Nozzle worn out

SOLUTIONS

Replace

Check and Restore

Clean or Adjust

Replace

Clean up seat

Replace

Pressure spikes

Valve does not bypass at low pressure

Less than 5% of total flow rate discharged in bypass

Excessive flow rate in bypass

Adjustment carried out with spring completely compressed

Jammed check valve

Check valve O-ring worn out

Material matter on check valve

Reset

Choose different valve type or adjust passages

Loosen knob and replace nozzle

Clean or replace

Replace

Clean

REGULATIONS :

See Standard Manual.

referred to in the

Declaration of Conformity

.

For a correct use, follow the instructions given in this booklet and re-print them on the Use and

Maintenace Manual of the machine.

Make sure that you are given the original Declaration of Conformity for the chosen item. This booklet is applicable for all unloader valves type VB 450-200/300

MAINTENANCE

All maintenace operations must be carried out by qualified personnel only.

ROUTINE: every 400 hours of operation (around 10000 cycles), check and lubrify seals with waterproof grease.

EXTRAORDINARY:every 800 hours of operation (around 20000 cycles), check conditions of seals and other internal components. If required, replace them with original PA spare parts.When installing the spares, lubrify them with waterproof grease.

IMPORTANT : in case of replacement, assemble the valve correctly, resetting all conditions to starting levels and making sure to fix the nut pos.25 with thread locking liquid.

The manufacturer is not liable for damages resulted from incorrect fitting and maintenance.

Technical data, descriptions and illustrations are indicative and subject to modification without notice.

3

60.4020.00 VB450/200 unload. 1"1/4 Bsp F

60.4030.00 VB450/300 unload. 1"1/4 Bsp F

60.4220.00 VRP 450/200 reg.valv 1"1/4 Bsp F

60.4230.00 VRP 450/300 reg.valv.1"1/4 Bsp F

Pos.

P/N Description

1 60.4014.31R Piston holder, 1"1/4 Bsp F

2 10.3208.28R O-ring, 2,62x36,17 mm Ni85

3 60.4013.51R Spring, 1,6x23,1x44mm (1,2)

4 60.4012.31R Check valve (1,2)

5 10.3350.00R O-ring, 6x18 mm (1,2)

6 60.4001.35R Housing -VB450, 1"1/4Bsp F, brass

7 10.3077.08R O-ring, 1,78x28,3 mm Ni 85

8 60.4002.51R Seat

9 60.4003.51R Shutter, M 12

10 10.3206.08R O-ring, 2,62x28,25 mm Ni85

11 60.4005.31R Bushing

12 10.4084.00R Back-up ring, 16x20,5x2mm

13 10.3181.20R O-ring, 2,62x15,88 mm

Kit P/N Description

K1 60.4022.24 Spares kit -VB 450/200-300, 10x1pcs.

K2 60.4222.24 Spares kit -VRP 450/200-300, 9x1pcs.

(1) 60.4020.00 (2) 60.4030.00 (3) 60.4230.00

Q.ty K1K2K3K4

1

2 • •

1

1

1 •

1

1 • •

1 • •

1 • •

1 • •

1

1 • •

1 • •

3

5

3

10

10

1

10

3

10

3

5

3

3

Pos.

P/N

14 60.4007.31R Bushing

Description

15 10.3246.05R O-ring 3,53x28,17 mm

16 10.4096.00R Back-up ring, 28x34x2mm

17 60.4004.51R Piston, M 12

18 14.7465.00R Ball, 1/2" Sst.

19 60.4009.31R Piston holder

20 60.4010.31R Ball holder

21 60.4006.61R Spring, 9x33x110mm

22 60.4015.61R Spring (2,3)

23 60.4016.31R Spring holder

24 60.4008.31R Screw plug M 48

25 11.4845.00R Nut, M16x1,5 Sst.

26 60.4011.51R Screw, M16x54mm Sst.

1

1

1

1

1

1

1

1

1

1

1

Q.ty K1K2K3K4

1

1 • •

1 • •

1

3

5

2

3

3

2

5

1

3

3

5

5

3

Last updated 24/10/2020