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Pressure Relief Valve

Lead Free* Models Available


½” and ¾” NPT threaded


The Model LFPV20CB is a direct sensed direct acting, diaphragm actuated Pressure Relief valve.

It is normally held closed by the force of the adjustable spring setting above the diaphragm. It modulates toward an open position when control pressure, exerting force below the diaphragm, exceeds the spring set-point, and modulates toward a closed position when the control pressure falls below the spring set-point. The LFPV20CB senses upstream pressure through a tapped inlet port. The large diaphragm-to-seat ratio allows it to open and close within close pressure tolerances.

This stand-alone unit is UL and FM approved for Fire applications and can handle inlet pressures up-to 450 psig.

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Disclaimer: Ames product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Ames Technical Service. Ames reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Ames products previously or subsequently sold.

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*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.