Request Information
Parker’s MARA series (Metal Seat) relief valves provide reliable venting of gases or liquids for set pressures from 3,000 psi (206.8 bar) minimum to 15,000 psi (1035 bar). The standard temperature range for all models is -423ºF to 400ºF (-252ºC to 204ºC). A high temperature option to 750ºF (400ºC) is also available. These precision valves are designed for pressure gas systems, cryogenic systems, petrochemical applications and other special systems.

Capable of handling air, gases, steam, vapor and liquids, they are however, not recommended for steam boiler applications nor are they ASME code stampable. Relief valves are designed to open proportionally to increasing pressure. Therefore, they are not recommended for applications requiring immediate full valve flow at set pressure (such as decompositions, polymerizations, etc.). Full flow of relief valve is defined at 10% over set pressure. Relief valve accuracy = +/-3% of setpoint.

NOTE:
  • For 2507 Super Duplex option, replace -SS with -2507. For 2507 Repair kits, include -2507 as suffix.
  • -XF Ferrules are required for 3/4" and 1" 316 SS or 2507 Super Duplex Tubing.
  • Relief Valves are factory set - Supply Set Pressure at time of order.
    • Unit of Measure

    Connection

    		 N/A MPI™ to FNPT

    Size

    		 N/A 1/2 x 3/4

    Orifice Diameter

    		 N/A .188 in

    Pressure Rating [Min]

    		 N/A 5000 psi345 bar

    Pressure Rating [Max]

    		 N/A 10000 psi690 bar

    Back Pressure [Max]

    		 N/A 500 psi34 bar

    A

    		 N/A 10.62 in

    Repair Kits

    		 N/A R8MARA-10K-2507

    Caution

    		 N/A
    1. Parker Relief Valves are preset and factory sealed. Warranty is voided if seal is broken by customer.
    2. Maximum system operating pressure should not exceed 90% of relief valve set pressure. Pressures in excess of this value may cause weepage resulting in damage to plug and seat.
    3. Care should be taken when locating a relief valve within a piping system to keep the relief valve as far from the pump as possible. Certain pumps create an end-of-stroke spike in pressure that is not detectable by common instrumentation. These spikes could cause premature failure of the relief valve.