Viking Pump TSM161.3: LS-M 127/4127 - Manual (Page 11)

SECTION TSM 161.3 ISSUE D PAGE 11 OF 12
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.
If a new spring is installed or if pressure setting of pressure
relief valve is to be changed from that which the factory has
set, the following instructions must be carefully followed.
1. Carefully remove valve cap which covers adjusting
screw.
Loosen locknut which locks adjusting screw so pressure
setting will not change during operation of pump.
2. Install a pressure gauge in discharge line for actual
adjustment operation.
3. Turn adjusting screw in to increase pressure and out to
decrease pressure.
4. With discharge line closed at a point beyond pressure
gauge, gauge will show maximum pressure the valve will
allow while pump is in operation.
In ordering parts for pressure relief valve, always give model
number and serial number of pump as it appears on
nameplate and name of part wanted. When ordering springs,
be sure to give pressure setting desired.
PRESSURE ADJUSTMENT
IMPORTANT
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.
Mark valve and head before disassembly to insure proper
reassembly.
1. Remove valve cap.
2. Measure and record length of extension of adjusting
screw. Refer to “A” on figures 9 and 10.
3. Loosen locknut and back out adjusting screw until spring
pressure is released.
4. Remove bonnet, spring guide, spring and poppet from
valve body. Clean and inspect all parts for wear or
damage and replace as necessary.
Reverse procedures outlined under Disassembly. If valve
is removed for repairs, be sure to replace in same position.
Relief valve adjusting screw cap must always point towards
suction side of pump. If pump rotation is reversed, remove
relief valve and turn end for end. Refer to figures 1 and 2,
page 1.
ASSEMBLY