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Parker’s MARSA series (Soft Seat) relief valves utilize a soft seat design for reliable venting of gases at set pressures from 1,500 psi (103 bar) to 15,000 psi (1035 bar). The operating temperature range is -50ºF (-46ºC) to 400ºF (204ºF). The soft seat design provides bubble tight sealing, repeatable pop-off, and reseat. Additionally, soft seat valves provide a higher cycle life than metal seat relief valves.

These precision valves are designed for pressure gas systems, where zero leakage is critical. They are not recommended for liquid nitrogen or liquid carbon dioxide, which produce gas at cryogenic temperatures upon relief. 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 9/16 x 3/4

    Orifice Diameter

    		 N/A .156 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 R9MARSA-10K

    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.