PRESSURE RELIEF VALVE
INSTRUCTIONS
Valve - List Of Parts
V1.
Valve Cap
V6.
Valve Body
V2.
Adjusting Screw
V7.
Valve Spring
V3.
Lock Nut
V8.
Poppet
V4.
Spring Guide
V9.
Cap Gasket
V5.
Bonnet
V10.
Bonnet Gasket*
* AS, AK, AL sizes only
FIGURE 15: RELIEF VALVE - ALL SIZES
V8
V7
V9
V10
V6 V5
V1
V3
V4
V2
A
NOTE:
Image is
representative only.
DISASSEMBLY
Mark valve and head before disassembly to ensure proper
reassembly.
1.
Remove valve cap.
2.
Measure and record length of extension of adjusting
screw. Refer to “A” on
“Figure 15” on page 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 if necessary.
ASSEMBLY
Reverse procedures outlined under
“Disassembly” on
page 10
. 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.
PRESSURE ADJUSTMENT
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
adjusting operation.
3.
Turn adjusting screw CW (in) to increase pressure
and CCW (out) to decrease pressure. For guidance
dimensions, contact your Viking Pump
®
representative for
Engineering Standard ES-37.
4.
Close the discharge line at a point beyond the pressure
gauge. Limit the amount of time the pump is being
operated at this condition. The temperature inside the
pump will rise rapidly. Gauge will show maximum pressure
that valve will allow while pump is in operation.
5.
Once pressure is set, tighten locknut and replace cap
gasket and valve cap.
IMPORTANT ORDERING INFORMATION
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.
⚠
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.
TSM 1741 | Issue B | Page 10 of 20
© 2019 Viking Pump, Inc. • Cedar Falls, IA
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
© Viking Pump, Inc.
