Rotary Control Valve

The Rotary Control Valve is an industrial control valve used to regulate the flow of liquids, gases, or steam. It features a rotatable, centrically mounted throttle disc which, together with a fixed counter surface with defined radial flow channels, controls the cross-sectional flow area within the valve. By rotating the throttle disc through a limited angle, the flow can be continuously and accurately regulated.

Rotary control valves are typically compact in design, offer excellent control performance especially at low rated flow coefficients, and provide high seat tightness when closed. They are preferred in applications that require high rangeability – especially at extreme temperatures, minimal leakage, and robust performance with abrasive or critical media.

They are commonly actuated by pneumatic or electric rotary actuators. The moving components are sealed against each other by the differential pressure as well as by a compression spring for preloading. Either maintenance-free, spring-loaded V-ring packings or conventional, adjustable stuffing box packings are used for the external sealing of the valve shaft to ensure reliable operation even at high temperatures and pressures. Typical areas of application include the chemical industry, power generation, oil and gas processing, and general process engineering.