308793 9
Installation (All Pumps)
Non-Circulating Systems
In non-circulating systems with a fluid outlet that can
be closed off (causing the pump to stall), install a fluid
pressure relief valve (AA) and a return line (BB) lead-
ing back to the fluid supply line (C). See Fig. 3.
WARNING
COMPONENT RUPTURE HAZARD
The pressure relief valve reduces the
risk of the pump overpressurizing if the
piston seal is worn and leaking, and the
fluid outlet is closed off. Install the valve so the ar-
row on its body matches the direction of fluid flow.
Do not install a fluid shutoff valve in the fluid line
between the pump outlet (DD) and the pump inlet
(CC). Doing so defeats the purpose of the pressure
relief valve if the shutoff valve is closed, resulting in
pump overpressurization. Overpressurization can
cause the pump or components to rupture, result-
ing in serious injury and property damage.
7656A
DD
C
AA
BB
CC
E
1
Fig. 3
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Do not install a fluid shutoff valve in the fluid line
between the pump outlet (DD) and the pump inlet (CC).
See the WARNING above.
Pressure Relief Valve
(for non-circulating systems)
KEY
B Pump Stand
C Fluid Supply Line; 38 mm (1–1/2 in.) minimum diameter
D Fluid Shutoff Valve
E Fluid Line; 25 mm (1 in.) minimum diameter
AA External Pressure Relief Valve
BB Fluid Return Line
CC Pump Fluid Inlet
DD Pump Fluid Outlet
B
CDD 1
1
