Wafer Style, Jorlon Diaphragm

The Mark 575 Series wafer style sliding gate back pressure regulator is used to regulate the upstream pressure to a predetermined setpoint. The spring in the Mark 575 holds the sliding gate seats in their normally closed position. The wafer style design allows for easy installation and maintenance due to its reduced weight and sliding gate seats.

Features & Benefits
  • Wafer Style Body — reduces weight
  • High Capacity — 6″ (DN150) provides 400 Cv (345Kv)
  • No Sensing Line Required
  • Sliding Gate Trim — unique seat design for unsurpassed trim life and accuracy.
  • Jorcote Seat Coating — ceramic composite for liquids, gases and especially steam. Very low friction with outstanding wear resistance and a temperature rating of up to 550°F (288°C). Steam tested to 1,000,000 cycles and still maintained Class IV leakage.
  • Jorlon Diaphragm — extremely durable, virtually universally applicable up to 450°F. Tested without failure to over 1,000,000 full stroke cycles. Ideal for steam, gases and liquids. 316SST diaphragm applicable up to 550°F.
  • Straight-through Flow — The flow is straight through the valve seats and body. Direction of the disc travel is perpendicular to the flow, not opposed to the direction of the flow. Thus, the flow does not unbalance the seats. The MK50 can use a wider range of its stroke to give accurate control; less offset and rangeability up to 20:1.
  • Quiet Operation — typically 5-10 dB less than conventional globe style regulators. The disc and plate are always in contact, which eliminates chattering. Straight-through flow minimizes turbulence. Multiple orifices in the plate and disc divide the flow stream into smaller flow components.
  • Minimum Maintenance — The MK575 sliding gate seats require no special tools for disassembly. The seats are pre-lapped at the factory and are self-lapping while in operation ensuring a continual tight shutoff.

Sizes: 3″ – 6″ (DN80 – DN150)

Cv (Kv): up to 400 (up to 345)

Diaphragm: Jorlon, EPDM, Neoprene/Nylon, Viton, Buna-N

Setpoint: 4 – 30 psi (0,28 – 2,07 bar)

Body Material: Carbon Bar, Carbon Steel, Stainless Steel Bar, Stainless Steel

Options: Handwheel (In Range), Stainless Bolting, Clean for Oxygen, or Oil-Free Service


Benefits of the Sliding Gate

Read on to learn the benefits of owning sliding gate regulators and control valves.

Sliding Gate Infographic

Download this infographic on the benefits of the sliding gate in regulators and control valves.

Sliding Gate Valve Overview

Watch this video for an overview of Sliding Gate Pressure Regulators and Control Valves

Sliding Gate Videos

Learn more about the sliding gate seat design by watching these videos.


CRN Number
Mark 575: 3″ – 6″

ATEX Certified

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