MGM Model 167 Back Pressure Check Valves are designed to allow flow in one direction only. The check mechanism is held in the closed position by a spring. This stops flow in the reverse direction. They are made completely of carbon steel and/or stainless steel not castings, for added durability.
When pressure from flow in the permitted direction overcomes the force of the spring, the check mechanism opens. When this flow stops or reverses, the check closes. The metal to metal seal allows slight leakage after closure. These valves are recommended for use in all inflowing lines. They may be used in any position. The MGM Model 167 Back Pressure Check Valves are designed for installation in lines that flow into pressure tanks. They should be in inflowing lines when outward flow is never required.
NOTE: Do not reduce outlet pipe size. Back Pressure Check Valves should be installed as close as possible to the container, with the stem pointed inwardly toward the container.
All Size Values are in Inches.