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Check & Relief Valves

Hy-Lok check and relief valves offer secure, leak-free connections and provide the lowest overall cost of any instrument check and relief valve used in the market today. Rugged and compactly designed, Hy-Lok offers a wide range of sizes and  cracking pressures. End connection options include male / female NPT, Hy-Lok tube fittings, metal gasket and O-ring face seals. Available in stainless steel, brass, and alloy 400.

Check and Relief Series This Page: 700, 700H, RV, CVA

With pressure handling up to 6,000 psi and temperatures up to 600°F, Hy-Lok has a check and relief valve solution to meet your needs.

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


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.
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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 1/8" to 1" tubing and pipe. 
  • Variety of end connections include male/female NPT, ISO, BSP threads and female Hy-Lok tube fittings.
  • Body material standard in 316 stainless steel.
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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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