Double-eccentric rotary plug valve

The Rotator

The Maxifluss Rotary Plug Valves have a double-eccentric plug, which moves away from the seat without any friction as soon as it opens. The valves are designed with an optimized flow contour to permit high flow rates. The high KVS coefficient and control ratio of 200:1 make the valves suitable for a wide range of applications. Thanks to the double-eccentric design of the rotary plug, the full cross-section of flow is released leaving the flow path unobstructed.

Features at a glance

Flexible flow control

Various seat features are available for rotary plug valves, allowing the KVS coefficients to be adapted to suit the process conditions. As a result, the valves can be configured to meet specific process requirements and to make best possible use of the control range.

Control over a wide load range

The rangeability of the double-eccentric rotary plug valves is between 100:1 and 200:1. As the plug moves closer to the seat to close the valve, the flow rate is changed gradually until the plug contacts the seat. This means, in theory, the valves can control within a range including a zero flow rate.

Design advantage

Much smaller actuators can be used since the plug moves crossways to the flow path. As a result, the plug is only fully exposed to the flow forces in the closed position.

Innovation in action

Blow-out protection

The double-eccentric design of the Type 82.7 Rotary Plug Valves is achieved by the offset of the shaft in combination with the plug as well as the offset of the plug's pivot. The exhibited rotary plug valve is fitted with a blow-out protection to retain the shaft securely inside the valve even when an actuator is not mounted. This design option facilitates maintenance work on the valve and protects operating personnel from a potentially hazardous situation that can arise while mounting the actuator.

An optional blow-out protection of the valve shaft provides extra safety for operating personnel by ensuring that the shaft cannot be released uncontrollably when the actuator is removed.

The double offset causes the plug to be immediately lifted out of the seat without any friction as soon as the valves open. This ensures a smooth opening action, resulting in a stable control response even at small opening angles.

Type 72.3 Valves are available in different versions to handle various temperature ranges. Noise-reducing features, a range of packings and various body and trim materials allow the valves to be customized to meet application requirements.

Trade fair impressions

ACHEMA 2022

A member of the SAMSON GROUP

Control valves from a single source

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