SAFETY VALVES BEING PRESSURE RELIEF

Brand Owner Address Description
NORRISEAL WELLMARK Norriseal-WellMark, Inc. 11122 West Little York Houston TX 77041 safety valves being pressure relief valves for oil and gas facilities; automatic control valves; automatic liquid level control machines; liquid level switches for monitoring and controlling liquids in tanks and vessels; pressure controllers for controlling the pressure of liquid, semi-liquid, and gaseous substances in industrial processes; liquid level gauges; electric valve actuator;pressure regulators being parts of machines; check valves as parts of machines; butterfly valves being parts of machines; pneumatic and hydraulic valve actuators;Externally-mounted chambers and domes for use with liquid level switches or liquid level controllers, namely, metal storage tanks for oil and gas;pressure regulators for gas pipes and lines;
 

Where the owner name is not linked, that owner no longer owns the brand

    
Technical Examples
  1. A hydraulic system has at least one primary hydraulic functions and a plurality of secondary hydraulic functions all of which are connected in parallel to a supply conduit and a return conduit. A first pressure relief valve prevents pressure in the supply conduit from exceeding a first limit and second pressure relief valve prevents the pressure at the secondary hydraulic functions from exceeding the lower second pressure limit. Novel pressure relief circuits are provided which enable only two pressure relief valves to provide one of two pressure limits at more than two hydraulic functions.