Viking Pump TSM143: N-P 335/4335 - Manual (Page 14)

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