High Sensitivity

The Mark 51 Series handles a broad range of applications including steam, water, oil, gas air and chemicals. Excellent capacity and the sliding gate trim enables the Mark 51 to quickly and accurately regulate upstream pressure preventing over-pressure situations. It features a larger diaphragm to provide greater sensitivity.

Features & Benefits

Larger diaphragm than a Mark 50 to provide even greater sensitivity and more accurate regulation of your required setpoint


Sizes: 1/4″ – 3/4″ (DN8 – DN20)

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

Diaphragm: Stainless Steel, Elastomer

Setpoint: 0.5 to 170 psi (0,03 to 11,7 bar)

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

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


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 51 Series: 1/4″ – 3/4″

ATEX Certified

Jordan Valve Express

Mark 51 Series

Sizes: All Sizes
FNPT end connection, SST/Jorlon Diaphragm

Some exclusions may apply

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Related Products

Mark 50 Series

Self-Operated Back Pressure Regulator

Mark 501/502 Series

High Flow

Y-Type Strainers

Line Strainers

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