Telephone Icon

relief and check valves

Relief Valves

Relief valves are used in hydraulic circuits to protect the downstream circuit from overpressurization by a pump. They are factory set for a specified cracking pressure (i.e. set pressure), and are adjustable or available with tamper proof wire to inhibit field readjustment. When inlet pressure is reduced to within 25% of set pressure, the relief valve reseals.

Relief Valves are manufactured with zinc plated carbon steel bodies with hardened stainless steel sealing components.

Relief Valve Illustration

A relief valve is a last resort safety device and is not intended to be used as a pressure reducing or regulator valve.

Relief Valves

Ports: ¾" NPT: Inlet - Male; Outlet - Female
Cv = 2.0
For tamper proof option, add "-TP" to the part number
Currently available installation drawings are indicated in blue.
Click on link to download
Part # Model # Working
40-1864 RV-1250 1000 psi 1250 psi
40-1647 RV-1750 1500 psi 1750 psi
40-1865 RV-2250 2000 psi 2250 psi
40-1646 RV-3300 3000 psi 3300 psi
40-1648 RV-5500 5000 psi 5500 psi
Relief Valve Data Sheet


Check Valves

Check valves provide unidirectional flow, sealing against reverse flow, and are commonly used on the outlet side of a pump.

Illustration of Check Valve

Never rely on the check valve as a block valve for upstream maintenance.

Check valves are manufactured with zinc plated carbon body and hardened stainless steel in-line poppet to provide a metal-to-metal seal for long life in hydraulic oil and lubricated water.

Check Valve

Pressure Rating: 5000 psi
Part # Model # Port Size, Female Length (in.) Weight (lbs) Cv
40-1508 CV-50 1/2" NPT 3.73" 0.6 5
40-1507 CV-100 1" NPT 4.88" 2.1 12
Relief Valve

Check Valve

Check Valve