Z28Q

High Pressure High Temperature Class 2500, full differential pressure for sizes up to and including 2″ (DN50), differential pressure of up to 255 bar (3700 psi) for sizes 2½” (DN65) and above with hybrid seats. Pressure containing parts are in compliance with ASME B16.34, for wall thickness, design type-tested for burst testing of four times the pressure rating for 5 minutes. A one-size-up stem made of high tensile material complies with ASME B16.34 and API 6D for drive train requirements provides a sufficient safety factor during operation. A special hybrid seat design is comprised of a metal housing and polymer insert machined as a single unit which provides bubble tight shut-off (Rate A), combined with lower operating torque.

Applicable Standards
  • ASME B16.34

    Valves--Flanged, Threaded, and Welding End...

  • ANSI FCI 70-2

    , Standard for Control Valve Seat Leakage

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