General Pump ZK71 Flow Sensitive Unloader Valve, 3500 psi, 2.9-4.2 GPM

ZK71 – GP K7 Flow Sensitive Unloader Valve 2.9-4.2 GPM @ 3500 PSI

ZK71 GP K7 Flow Sensitive Unloader Valve 2.9-4.2 GPM @ 3500 PSI by General Pump. Eliminates high pressure in all lines while unit is in bypass mode. Maximun PSI 3500, Maximun Temp 165 deg F., 3/8 in. FNPT Inlet, 3/8″ MNPT Outlet, 3/8 in. FNPT By-Pass. Choose model with orifice size carefully due to the fact that these flow sensitive unloaders will not work properly with flow rates outside of their flow range. Available orifice sizes: ZK71 3.0 – 4.2 GPM, ZK72 4.2 – 6.6 GPM, ZK73 6.6 – 10.8 GPM.

Flow sensitive unloader valves do not work well with high pressure hose lengths in excess of 100′.

Features:

• Features all stainless and brass internal parts.
• New design reduces sensitivity to entrapped air.
• No external moving parts or springs.
• Eliminates high pressure in all lines while unit is in bypass mode.
• Bypass restrictor eliminates pressure peaks during bypass.
• Unique balanced piston design permits precise pressure adjustments.
• Simple design for easy maintenance and service.

Specifications:

• Maximum Volume Range: 2.9-4.2 GPM
• Maximum Pressure: 3500 PSI
• Maximum Temperature: 165 Deg. F.
• Inlet: 3/8 BSP-F
• Outlet: 3/8 BSP-M
• Bypass: 3/8 BSP-F
• Overall Dimension: 7.5 x 3.75 x 3.5
• Material: Brass, Stainless Steel, Buna-N
• Weight: 4.5 Lbs.

INSTALLATION:

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.