Griffco Valve Inc: Back Pressure Valves

Back Pressure Valves

Griffco diaphragm back pressure valves are designed to enhance the performance of chemical feed systems by providing a constant back pressure to the chemical feed pump, while also acting as an anti-siphon valve. Robust construction ensures reliability in the rigorous service of municipal and industrial applications.

Available in sizes 1/4" through 2".

Materials of construction include PVC, PP, PVDF, PTFE, 316 SS, Alloy 20, and Hastalloy C.

Features:

High Reliability / Low Cost
Robust, Machined Construction
Vulcanized PFA/EPDM Diaphragm
Externally Adjustable 0 - 150 psi
Anti-Siphon Function
Wide Range of Materials
Tamper Resistant Adjustment Screw
Manufactured and Stocked in the USA

Operation:

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 0 - 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.