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Pressure relief valve instructions, Disassembly danger, Assembly – Viking Pump TSM143: N-P 335/4335 User Manual

Page 14: Danger, Pressure adjustment

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INLET

OR

SUCTION

OUTLET

OR

DISCHARGE

RELIEF VALVE

ADJUSTING

SCREW CAP

SECTION TSM

143

ISSUE

E

PAGE 14 OF 15

PRESSURE RElIEf VAlVE INSTRUCTIONS

lIST Of PARTS

1. Valve Cap

2. Adjusting Screw

3. Lock Nut

4. Spring Guide

5. Bonnet

6. Valve Body

7. Valve Spring

8. Poppet

9. Cap Gasket

10. Bonnet Gasket

DISASSEMbly

DANGER !

before opening any Viking pump liquid cham-

ber (pumping chamber, reservoir, relief valve

adjusting cap fitting etc.) be sure:

1. That any pressure in

the

chamber has been

completely vented through

the

suction

or discharge lines or other appropriate

openings or connections.

2. That the driving means (motor, turbine,

engine, etc.) has been “locked out” or made

non- operational so that it cannot be started

while work is being done on pump.

3.

That you know what liquid the pump

has been handling and the precautions

necessary to safely handle the liquid.

Obtain a material safety data sheet (MSDS)

for the liquid to be sure these precautions

are understood.

failure to follow the above listed precaution-

ary measures may result in serious injury or

death.

Mark valve and head before disassembly to ensure proper

reassembly.
1. Remove the valve cap.
2. Measure and record the length of extension of adjusting

screw. Refer to “A” on Figure 19.

3. Loosen the locknut and back out the adjusting screw

until the spring pressure is being released.

4. Remove the bonnet, spring guide, spring and poppet

from the valve body. Clean and inspect all parts for wear

and damage and replace as necessary.

ASSEMbly

Reverse the procedures outlined under

DISASSEMbly. If

the valve is removed for repairs, be sure to replace in the

same position.The relief valve adjusting screw cap must

always point towards suction side of the pump. If the pump

rotation is reserved, remove the relief valve and turn end for

end. Refer to Figure 20.

DANGER !

before starting the pump, be sure all drive

equipment guards are in place.

failure to properly mount guards may result in

serious injury or death.

PRESSURE ADJUSTMENT

If a new spring is installed or if the pressure setting of the

pressure relief valve is to be changed from that which the

factory has set, the following instructions must be carefully

followed.
1. Carefully remove the valve cap, which covers the

adjusting screw.
Loosen the locknut, which locks the adjusting screw so

the pressure setting will not change during operation of

pump.

fIGURE 19

fIGURE 20