Proportion-Air, Inc. offers QL3 high resolution pressure control valves. These valves have pressure ranges from 0 to 165 PSIG, supply ranges from 15 to 24 VDC, operating temperatures ranging from 32 to 158°F, and an IP65/NEMA 4 protection rating. These valves are constructed from aluminum, stainless steel, Buna-N, Viton, brass, and nickel plating materials.
Proportion Air makes pneumatic pressure control valves, including electro-pneumatic valves, closed loop valves, high flow valves, and high resolution valves. Their high res control valves have a pressure range of 0 to 150psig with output pressure from 0-100% of the range and 40 micron actual filtration, and wetted elastomers made of Buna N, an aluminum nickel plated manifold, and Utem 1000 aluminum P. transducer.Website
Proportion-Air manufactures the packaged F-Series FCV, a proportional flow control valve that consists of an electronic pneumatic positioner, a pneumatic valve actuator, an LVDT position sensor to continuously monitor valve position, an angle seat valve, and a parabolic shaped linear valve trim. These valves fit pipe sizes from 0.25" to 1.5", and permit flow ranges from as low as 1-20 scfh to 25-250 scfm. The company's basic flow control valve allows a maximum Cv of 19, as well as an integral closed-loop position with +/-0.3% F.S. resolution; analog outputs of 0-10 Vdc and 4-20 mA are available.Website
Proportion Air manufactures electronic air pressure regulators and air flow control valves in a variety of configurations. High flow control valves are closed loop electronic pressure regulators that can achieve forward flow rates up to 200 SCFM and exhaust flow rates up to 300 SCFM. Electronic pressure control valves feature control limits up to 1000 PSI, while ultra high resolution pressure control valves are capable of resolutions as high as +/- 0.005% F.S.Website