Profile: Valve Research & Mfg. Co. designs and manufactures quality hydraulic and pneumatic valves. Our product line includes 2, 3 and 4 way direct or pilot operated valves, check valves, relief valves, and flow regulator valves. Our 2-way solenoid valves are used in the commercial aircraft, military aircraft, and the aerospace industries. Valve types include normally open and normally closed valves, for use in fuel, hydraulic, or pneumatic applications.