Griffco Back Pressure Valve, 1/2" PVC, Standard 0-100 PSI, Set 100 PSI, Field Adjustable, EPDM/PTFE

Griffco diaphragm back pressure valves apply positive discharge pressure to a metering pump system to prevent siphoning and eliminate varying dosage rates caused by fluctuating downstream pressure. The diaphragm is held against the valve seat by an internal spring. When the preset pressure is exceeded, the diaphragm is forced up and chemical flows through the valve to the injection point.

The valves are preset for 50 psi, however they are field adjustable from 10 - 150 psi via the adjustment screw. Installation should be as close to the injection point as possible to prevent chemical line drainage, and it is most important that all chemical system equipment such as pulsation dampeners and pressure gauges are between the pump and back pressure valve.

Features:

• Molded Noryl Top 
• High Reliability / Low Cost
• Compact Size for OEM Applications
• Adjustable Pressure Settings
• Optional 350 PSI Rated Valve
• Anti-Siphon Function
• Robust, Machined Body Construction
• Vulcanised PTFE/EPDM Diaphragm
• Wide Range of Materials
• NSF/ANSI 61 Certified (PVC)