Two position, two way Normally Closed, positive flow shut off, safety valves.

DESIGNED to provide instantaneous, positive flow shut-off in the event either of the following abnormal conditions occur: (1) a high pressure surge at the Inlet, (2) development of a pressure differential downstream of the Outlet connection or in the receiving control circuit.

SPECIAL FEATURES include the valve's suitability for use with either pneumatic or hydraulic fluid, control circuits. Several different models can be provided for either Field or Panel mount and/or special low pressure (below 200 PSI) applications.

REASON TO USE: It is excellent for as a rupture response, flow control valve for use with diaphragm operated, Bourdon Tubes or Helical Coil, control devices. The Velocity Check Valve would prevent discharge of fugitive emissions from ruptured Transmitters, Pressure Gauges, pneumatic/electrical Switches and Pressure Sensors.

More frequently, the HLR 7790 Series Velocity Check Valves are being utilized in "Push-To-Charge" (pressurize), control circuit applications. A sudden loss of operating pressure due to actuation of an ESD Valve or other component, will result in instantaneous flow shut off. In this manner, the instrument supply media (Nitrogen, Hydraulic fluid or Natural Gas) is conserved or isolated. Our Velocity Check Valves are also being utilized with Line Pressure Operated safety systems. It provides both the pressure shut-off response and the manual reset feature necessary.