The Pressure Relief Valve is designed to ensure the system does not exceed set pressure. When installing a relief valve, consideration must be given to the downstream venting arrangements.
Spring loaded
For general duties and orifice sizes up to 11.1mm (0.437") a simple spring loaded seat design is used covering pressure up to 450 bar (6500 psi). For more accurate control, a combination of balance piston and cone seat is used, the pressure acting on the differential area between the piston and the seat.