Pilot Assisted Check Valve for Low Pressure Applications

About this technology

Overview

Inventors at NASA have developed an advanced check valve with a pressure sensing design that allows the valve to crack open at low pressure differentials while still providing the required sealing stress on the valve seat at all pressures below cracking pressure. The design of the valve also allows it to maintain sealing stress on the seat regardless of downstream pressure. In low pressure conditions of 100 psi or less, sealing issues often occur when a low cracking pressure is desired. Alternative check valves are unable to provide the required sealing stress on the valve seat. This results in seat damage and eventual leak issues due to the rotation of internal parts relative to the seat. This valve provides a solution to low pressure applications with stringent leak requirements.