BULLETIN 20.96 R
RELIEF VALVE INSTRUCTIONS
Remove valve bonnet.
Measure and record the length of extension of
the adjusting screw.
Loosen the adjusting nut and rotate the
adjusting screw counter-clockwise until the
spring pressure is released fully.
Remove the cap, retainer disc, spring and
poppet, from the valve body. Clean and inspect
all parts for wear or damage and replace If
disassembly If the valve has been removed from the
pump for inspection, be sure to replace in the same
position. The bonnet should point towards the suction
The pressure setting on any relief valve supplied on a
pump should be adjusted and/or checked for setting on
individual applications as the valve is supplied with a
spring that is adjustable within a given pressure range.
To check the setting place a pressure gauge In the
discharge line between the pump and discharge gate
valve Slowly close the gate valve until full bypass
pressure is obtained This pressure should be greater
than the normal operating pressure If not, It can be
Increased by turning the relief valve adjusting screw
Inward until the desired setting is achieved After the
relief valve has been set, the locking nut can be
tightened and the bonnet can be re-assembled.
When ordering relief valve springs, be sure to state the
maximum operating pressure required.
REPLACEMENT PARTS LIST
NAME OF PART
NAME OF PART
page C12 -5