Hylok Oceania

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Home > Hy-Lok Fluid System Products > Valves > Check & Relief Valves

Check & Relief Valves

Check 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.

700 Series 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

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.

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.

RV Series: Relief Valves

Pressure rating to 3,000 psi (207 bar) at 70°F (21°C) for RV1 low 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.

RV2 Series: Relief Valves

Upto 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 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.

701 Series 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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