Viking Pump TSM845: K-KK 825, 823, 827 - Manual (Page 12)

SECTION TSM 845 ISSUE F PAGE 12 OF 14
VALVE - AS, AK AND AL SIzES
VALVE - 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 Gasket
DANGER !
Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
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.
(See detailed procedure for venting
the pumps, pages 4, 5 and 6).
2. That the driving means (motor,
turbine, engine, etc.) has been
“locked out” or made otherwise non-
operational so that it cannot be
inadvertently started while work is
being done on the 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.
PRESSURE RELIEF VALVE
DISASSEMBLY: RELIEF VALVE
ASSEMBLY: RELIEF VALVE
PRESSURE ADJUSTMENT
IMPORTANT
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 Figure 3, page 2.
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 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
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 Figure 23.
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
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.
FIGURE 23