10
Instruction Manual
3.2 RELIEF VALVE ADJUSTMENT
THE PRESSURE RELIEF VALVE
IS FACTORY SET TO OPEN AT A
PRESSURE SLIGHTLY ABOVE THE PUMP MAXIMUM
OPERATING DISCHARGE PRESSURE; NEVER SET THE VALVE
AT ANY GREATER PRESSURE.
All HPD liquid ends have a built in relief valve that
allows hydraulic uid to return to the hydraulic uid
reservoir if excessive pressure builds up in the
discharge line. This effectively stops the pump from
pumping, since the forward stroke of the piston
will not displace the hydraulic uid and force the
diaphragm to ex.
The HPD liquid end relief valve may be adjusted
to operating conditions by the following procedure.
Adjust the relief valve after rst installing the pump
and after any maintenance procedures.
1. A pressure gauge and shut OFF valve must be
installed in the discharge line to complete this
procedure. If the necessary equipment is not
installed, refer to the “Typical Piping” instructions
in Section 2.
2. Make sure shut OFF valve is open. Start pump
and pump process liquid to drain or other safe
point to establish proper pumping action.
3. Set capacity control at 30%.
KEEP HANDS AWAY FROM
RECIPROCATING PLUNGER
AND CROSSHEAD. DO NOT LEAVE PUMP OPERATING
UNATTENDED WITH SHUT OFF VALVE CLOSED. EXCESSIVE
PRESSURE CAN BUILD QUICKLY, POSSIBLY CAUSING
SEVERE DAMAGE TO PUMP AND / OR PIPING. SINCE THE
RELIEF VALVE IS NOT YET PROPERLY ADJUSTED, IT CAN NOT
BE RELIED ON TO LIMIT EXCESSIVE PRESSURE BUILD-UP. BE
SURE TO WATCH PRESSURE GAUGE VERY CAREFULLY AND
OPEN SHUT OFF VALVE IMMEDIATELY IF EXCESSIVE
PRESSURE DEVELOPS.
4. Close shut OFF valve slowly (“dead head” the
pump) and closely watch the pressure increase
on the pressure gauge. If pressure exceeds
desired value, quickly open shut OFF valve to
relieve pressure in line.
5. With shut OFF valve still closed, loosen relief
valve adjusting screw located on top of valve
until the maximum pressure gauge reading
reaches and maintains the relief valve pressure
setting desired.
6. After setting relief valve, make sure shut OFF
valve is fully open. Remove pressure gauge
from line or leave in place, as desired, and place
pump in routine service.
NEVER OPEN THE AIR PURGE
VALVE (IF EQUIPPED 0261)
DURING PRESSURIZED PUMP OPERATION.
7. The diaphragm head is equipped with an
air bleed purge valve built in just below the
discharge port. (Item 0350). The purpose of
this device is to vent entrapped air from the
diaphragm head during priming and start-up.
This end of this tting will accept exible tubing
in order to pipe OFF the solution to a non-
hazardous location. Immediately after priming,
the tting should be tightened.
SECTION 3 - OPERATION
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