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: 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 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.

	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.

	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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