PacSeal Hydraulics’ hard seat relief valves are used in hydraulic control systems to protect the downstream circuit from over-pressurization* by a pump. Contrary to soft seated relief valves, they are metal seated for improved reliability and longevity in severe service conditions.
The relief valves are also factory set for a specified cracking pressure (i.e. set pressure). When inlet pressure is reduced by 25% of set pressure, the relief valve reseals. The set pressure may be specified custom or standard ranging from 1250 to 5500 psi. Test reports may be supplied if requested.
The relief valve can be purchased as standard with an adjustable set pressure or as tamper proof to inhibit readjustment in the field.
*A relief valve is a last-resort safety device and is not intended to be used as a pressure reducing or regulating valve.