Circle Valve Technologies offers pressure valves and relief valves in various series' with differing configurations. The HP500 series relief valves are configured in stainless steel and brass and in sizes 1/4 and 1/2 inch. The 5100 Series of relief valves feature accurate set pressure, wide range of cracking pressure and positive reseal at high percentage of cracking pressure.

Plast-O-Matic Valves provides pressure regulators that are spring operated, air operated and differential. These regulators are also known as pressure reducing valves or forward pressure regulators. True Blue pressure regulators feature one piece body, fail dry safety feature, stainless steel external fasteners and rolling diaphragms.

Gadren Machine Company offers pressure reducing valves for maintaining uniform water pressure from overhead tanks/pumps in industrial and building applications. These valves allow for ongoing outlet pressures when inlet pressures rise above acceptable ranges, and they work to lower pressures/reduce wear in plumbing systems. They come in valve sizes ranging from 1/2" to 3", and they are constructed from brass/stainless steel materials.

Clark-Cooper Div. manufactures high pressure solenoid valves in the EH 30, 40, 50 and 70 series'. The EH 30 series are direct operated pressure valves in a 1/4 inch size with a reduced internal port size. The EH 40 series are compact high flow pressure valves in a 1/4 inch size with a full internal port size.

Parker manufactures a line of medium pressure valves and filters. Product lineup includes LPRA medium pressure relief valves, MPB series ball valves, MPBV series bleed valves, MPC series check valves, MPF series filter, MPGV series needle valves, MPN series needle valves and MPR series relief valves.

GEMS offers Predyne pneumatic solenoid and miniature solenoid valves for high-pressure applications, including cryogenic valves, isolation valves, cryogenic valves, and manifolds. These valves can be configured in 2-way, three-way normally closed, 3-way normally open, 3-way multipurpose, and 3-way directional control types.

Cole-Parmer offers Parker high-pressure multi-media solenoid valves, up to 1250PSI, such as the EW-01870-01 valve, a two-way 1/16" A-Lok valve, operating on 24VDC, high speed with estimated response time less than 5 milliseconds, designed for high repeatability.

Omega Engineering makes Omega-Flo 2-way high pressure solenoid valves, in sizes of 1/2" to 2.5" NPT, with pressures up to 700 PSI, for gases or liquids, at temperatures up to 99C/210F, with 120VAC standard.

Georg Fischer supplies a line of pressure control valves, including pressure retaining valves, pressure reducing valves and pressure relief valves. Pressure retaining valves consists of V786 in a size range from 1/2 to 1 1/2 inches, V186 in a size range from 1/2 to 2 inches, and V86 in a size range from 2 1/2 to 3 inches.

Automated Valve & Equipment Co. has available pressure regulating valves in bronze, cast iron and ductile iron materials. The O Series, B Series, 455 Series and 402/403 Series of pressure regulating valves have inlet pressures up to 450 psig with threaded and flanged connections. The R Series and 3040 Series of relief back pressure valves feature bronze and cast iron materials, maximum inlet pressure of 300 psi and a size range from 1/2 to 3 inches. The 175 Series and 153 Series of temperature regulating valves (self operated) for heating and cooling with a temperature range of 20° to 250°F and a size range from 1/2 to 4 inches.

Ives Equipment Corp. is a US based stocking distributor of industrial parts and components. Product offerings include pressure valves such as high pressure metal seated ball valves and pressure regulators.

Maxpro South distributes medium pressure and high pressure valves, fitting and tubing. Medium pressure valves are offered in 2 way straight, 2 way angle, 3 way/2 on, 3 way/1 on, 3 way/2 stem manifold and 2 way angle/replaceable seat designs with pressure up to 20,000 psi. The 36V series of high pressure valves are rated to 36,000 psi in 2 way straight, 2 way angle, 3 way/2 on, 3 way/1 on, 3 way/2 stem manifold and 2 way angle/replaceable seat designs. The 65V series of high pressure valves are rated to 65,000 psi in 2 way straight, 2 way angle, 3 way/2 on, 3 way/1 on, 3 way/2 stem manifold and 2 way angle/replaceable seat designs.

Valv-Trol produces a low pressure valve series and a high pressure valve series. The low pressure valve series is designed for directional control of low pressure systems up to 500 psi and includes direct acting (normally open) quick acting 2 way valves, reverse acting (normally closed) quick acting 2 way valves, quick acting 3 way valves, and 3 way/2 position 500 psi valves in size ranges from 1/2 to 1 1/4 inch. The high pressure valve series is designed for pressure systems up to 3,500 psi and optional pressure ranges of 10,000 to 30,000 psi, and includes two pressure valve assembly, balanced 3 way/2 position valves, 3 way diverter and selector valves, balanced 2 way/2 position valves, angle check valves, sequence or high pressure inlet valves, balanced 2 way/3 position valves for throttling services, low flow 2 way and 3 way valves, balanced 2 way valve normally open or normally closed, pressure reducing (regulating) valves, pilot-operated check valves, and back pressure relief valves.

Proportion Air manufactures electronic air pressure regulators and air flow control valves. Their high flow control valves are closed loop electronic pressure regulators for 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. The ultra high resolution pressure control valves feature resolution as high as +/- 0.005% F.S. The flow monitor and flow control valves control flow up to 250 scfm electronically. The proportions flow control valve features an angles seat design, integral LVDT valve position indicator, parabolic valve trim and stainless steel body.

Thorco manufactures pressure and vacuum relief valves as well as other low pressure relieving products. Their line of pressure/vacuum relief valves include 1200A relief valves to prevent over pressure or excessive vacuum, 1220A relief valves with pipe-away for escaping vapors, 160A relief valves with pipe away, and 1300A vacuum relief valves suited for conditions that only require vacuum relief. The line of emergency pressure relief valves includes 2000A emergency pressure relief valves that are weight loaded and 2100 A emergency pressure relief valves that are spring loaded.