Viking Pump TSM163: N-R 337/4337 - Manual (Page 14)

SECTION TSM 163 ISSUE D PAGE 14 OF 15
DANgER !
Before starting pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may
result in serious injury or death.
INLET
OR
SUCTION
OUTLET
OR
SUCTION
RELIEF
VALVE
ADjUSTINg
SCREW
FIgURE 20
DISASSEMBLY
DANgER !
Before opening any Viking pump liquid
chamber (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 above listed
precautionary measures may result in
serious injury or death.
ASSEMBLY
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.
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 pump rotation is
reversed, remove the relief valve and turn end for end. Refer
to Figure 20 below.
LIST OF PARTS
1. Valve Cap 6. Valve Body
2. Adjusting Screw 7. Valve Spring
3. Lock Nut 8. Poppet
4. Spring Guide 9. Cap Gasket
5. Bonnet 10. Bonnet
FIgURE 19
Sizes N and R
PRESSURE RELIEF VALVE
INSTRUCTIONS