General Pump part ZK71, ZK72, ZK73 Flow Sensitive Unloader Valve. Maximun PSI 3500, Maximun Temp 165 deg F., 3/8 in. FNPT Inlet, 3/8″ MNPT Outlet, 3/8 in. FNPT By-Pass. Choose orifice size from drop down. ZK71 3.0 – 4.2 GPM, ZK72 4.2 – 6.6 GPM, ZK73 6.6 – 10.8 GPM.
Select an unloader appropriate for the pressure and flow of your system (see specification chart). This unloading valve is a flow-through design and should be mounted on the discharge line of the pump in any
position (horizontal or vertical) which allows easy access to the adjusting bolt. A pressure gauge should
be installed on either side of the body of the unloader to accurately read pressure during adjustment.
Minumum 5% bypass is required for proper operation. Flow sensitive unloader valve.
Maximum Volume:?4.2-10.8 GPM
Maximum Discharge Pressure:?3500 PSI
Maximum Temperature: 165?F
Inlet: 3/8? FNPT
Outlet: 3/8? MNPT
Bypass: 3/8? FNPT
Dimensions: 7.5? x 3.75? x 3.50?
Material: Brass, Stainless Steel, Buna-N
ZK71 ->?2.9 – 4.2 GPM
ZK72 -> 4.2 – 6.6 GPM
ZK73 -> 6.6 – 10.8 GPM