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Check & Relief Valves

Check & Relief ValvesCheck valves, also known as clack valves or one-way valves, are an inexpensive yet effective solution to controlling back flow in high and low pressure fluid systems. Available in a wide range of sizes and cracking pressures, our mechanical check valves can handle up to 6,000 psi and temperatures up to 600°F.

We maintain a large inventory of instrument check valves, including welded check valves, compact check valves, ball check valves, high pressure check valves, and adjustable check valves. End connection options include male / female NPT, Hy-Lok tube fittings, and metal gasket & O-ring face seals. Hy-Lok offers stainless steel check valves  brass check valves, and alloy 400 check valves.

Browse our Instrument Check Valve PDFs for more information on technical dimensions, temperature and pressure ratings, and ordering information:

Welded Check Valve PDF CVW Welded Check Valve PDF
700 Series Check Valve PDF 700 Series Check Valve PDF
700H Check Valve PDF 700H Series High Pressure Compact Check Valve PDF
RV Series Check Valve PDF RV Series Relief Valve PDF
CVA Adjustable Check Valve PDF CVA Adjustable Check Valve PDF

Contact your Hy-Lok fluid system solutions expert today to learn more or locate a distributor.

Or go directly to: CVM, 700, 700H, RV, CVA


700 Series Check Valves 700 Series:  Instrument Check Valves
  • Pressure rating to 3,000 psi (207 bar) at 70°F (21°C).
  • Temperature rating from -10°F to 375°F (-23°C to 191°C) with Viton O-ring seat standard.
  • O-ring provides leak tight shut-off.
  • Back stopped poppet design prevents the spring from being over-stressed. 
  • Variety of springs are available for the cracking pressure in the range from 1/3 psi to 100 psi. 
  • Wide range of body sizes allows Cv choices from 0.16 to 8.8.
  • Suitable for gas and liquids. 
  • Variety of end connections include male/female NPT, ISO, BSP threads and female Hy-Lok tube fittings.
  • Body Material is standard in 316 stainless steel and brass.

 

700H High Pressure Check Valves 700H Series:  High Pressure Compact Check Valves
  • Pressure rating to 6,000 psi (413 bar) at 70°F (21°C).
  • Temperature rating from -10°F to 400°F (-23°C to 204°C) with Viton seat standard.
  • O-ring poppet design for replaceable high integrity seal.
  • Tight shut-off and accurate cracking pressure. 
  • Cracking pressure includes 1/3, 1, 5, 10, and 25 psi. 
  • Maximum flow design allows Cv choices from 0.67 to 4.7.
  • Suitable for gas and liquids.
  • Special applications are available in sour gas and fluorocarbon free. 
  • Size range from 1/8" to 1" tubing and pipe. 
  • Variety of end connections include male/female NPT, ISO, BSP threads and female Hy-Lok tube fittings.
  • Body Material is standard in 316 stainless steel.

 

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RV Series Relief Valves RV Series:  Relief Valves
  • Pressure rating to 3,000 psi (207 bar) at 70°F (21°C) for RV1 low pressure, and up to 6,000 psi (413 bar) at 170°F (21°C) for RV2 high pressure.
  • Temperature rating from -10°F to 400°F (-23°C to 204°C) with Viton seat standard.
  • Standard 4.8mm (0.19in) orifice.
  • Cracking pressure range from 10 psi to 250 psi for RV1 and from 225 psi to 6,000 psi for RV2 series. 
  • One spring adjustable over entire cracking pressure range for RV1 series. 
  • Compact design for small space installation.
  • Cracking pressure adjustable externally.
  • Lock wire capability to maintain pressure relief setting. 
  • Size range from 1/4" to 1/2" tubing and pipe. 
  • Variety of end connections include male/female NPT, ISO, BSP threads and female Hy-Lok tube fittings.
  • Body material standard in 316 stainless steel.

 

CVA Adjustable Relief Valves CVA Adjustable Check Valves
  • Pressure rating up to 3,000 psi (207 bar) at 70°F (21°C) 
  • Temperature rating from -10°F to 375°F (-23°C to 191°C) with Viton seat standard.
  • One piece body construction
  • Wide range of cracking pressures 
  • Ease of adjustment
  • Size range 1/4" & 1/2" pipe.   
  • Body material is 316 stainless steel and Brass.

 


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