Controlled Failure Option

The Mark 85 Series is a self-operated temperature regulator with controlled failure option which allows you to predetermine the position of the valve in the event of a thermal system failure. The Mark 85 is designed to fail closed on heating applications and to fail open on cooling applications. The Mark 85 Series is ideal for slower responding systems such as autoclaves and large storage tanks.

Features & Benefits
  • Rugged actuator for long service life – No gaskets or bellows to wear out
  • Replaceable thermal system – Can be replaced in the field for quick and easy range changes. Available with capillaries up to 100 feet long (1,5 meters)
  • Sliding gate seats provide straight-through flow for reduced turbulence and quiet operation
  • Short stroke for fast response and accurate regulation
  • Easily interchangeable CV’s
  • Tight shutoff

Sizes: 1/4″ – 3/4″ (DN8 – DN20)

Body Material: Ductile Iron, Bronze, Carbon Steel, Stainless Steel

End Connection: Threaded, Flanged, Socket Weld, Butt-Weld

Cv (Kv): up to 4.4 (up to 3,8)

Seat Material: Jorcote

Control Range: 40°F (4°C) to 285°F (141°C)


Benefits of the Sliding Gate

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

Sliding Gate Videos

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

Temperature Regulator Applications

What types of applications are temperature regulators the choice? Read on.

  • EC Declaration of Conformity/PED:
    Mark 85
  • CRN Number
    Mark 85: 1/4″ – 3/4″
  • ATEX Certified

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Related Products

Mark 80 Series

Self-Operated, No External Power Source

Mark 85 Series

Controlled Failure Option

Mark 86 Series

Ambient Temperature

Mark 87 Series

Externally Piloted

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