Masoneilan 525-526 Series Pressure Regulators

General features:
  • Flow to open or close design (depending on function)
  • Internal pressure sensing
  • Resilient single seat
  • Elastomeric Diaphragm
  • Flexible body orientation to simplify installation
  • Spring Loaded, Direct-Operated Regulator for Pressure Reducing or Relief Applications
  • Features

    Top and Bottom Guiding

    A well accepted industry standard particularly suited for double seated plugs to provide adequate support against side loads.

    High Capacity with Low Recovery

    Flow capacity is at top levels for contemporary double seated regulators and is attained with very little pressure recovery as indicated by a high critical flow factor.

    Reduced Capacity Trim

    0.4 Factor Trim - the most practical double seated trim design giving a substantial reduction in capacity while maintaining desirable flow characteristics.

    High Performance Materials

    Materials of construction have been selected for high performance and long life when handling the high pressure drop capabilities of the valve.

    High Temperature Applications

    For temperatures over the rating of the diaphragm material, the regulator must be mounted with the actuator below the centerline of the regulator body. The diaphragm will be protected from the high temperature by a condensate barrier in the sensing line and actuator diaphragm case. If installed otherwise, an adequate condensate barrier must be incorporated. Consult factory for more information.


    Models 525 and 526 Regulators are designed for use with the 10900 Series Actuators for reducing, back pressure and differential pressure applications. Refer to Technical Specifications bulletin GEA19537A for actuator selection.


    General Data Function

    Pressure Reducing(525)
    Differential Pressure Reducing(525-50)
    Back Pressure(526)
    Differential Back Pressure(526-50)


    Steam, Gas, Liquids


    ¾” through 4” (20 through 100 mm)


    Type : High Capacity Globe with Double Seated Top and Bottom Guided Plug
    Materials : Carbon steel, stainless steel

    Ratings and Connections

    Flanged : ASME CL150-600
    Welded : BW or SW
    Screwed : NPT ¾” through 2” (20-50 mm)


    Plug Type : Disc
    Seat Ring : Threaded
    Guide : Heavy Top and Bottom Guided
    Capacity : Full Area, Reduced Capacity in All Sizes


    Type : 10900 Spring Diaphragm


    Masoneilan 525/526 Regulator Tech Spec (English)

    Tech Spec/Fact Sheet English 656.65 KB

    Masoneilan 525/526 Regulator Manual (English)

    Manuals English 709.73 KB

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