The butterfly valve is opened or closed completely by an open-close rotary actuator. Continuous rotary actuators are controlled by a commercially available controller and move the valve discs into any position desired.
The disc made of stainless steel is pressed into the soft-sealing EPDM seat by a rotary movement and ensures leakage rate A (tight).
The flow rate losses are slight in open position and the kvs value is high.
Lug type butterfly valves, for shut-off functions, in open and closed cold and hot water systems, for switching heating and cooling machines on and off
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