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Series 311 | Soft Start Valve
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Series 311 | Soft Start Valve

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Series Number 311
Series Name Soft Start Valve
Description Soft-start valves consist of two halves of throttle flaps supported on a common axis and maintained in the open position by a spring. The axis is held in an ISO-KF centering ring that is formed as a body with valve seat. When mounting them between two ISO-KF flanges (instead of a centering ring), the open flaps must be orientated against the air flow in the vacuum line. When the roughing system goes into operation, a strong air flow occurs in the roughing line, which immediately closes the valve and reduces the pipe section by about 99%. When reaching a differental pressure of approx. 15 mbar, the valve opens and leaves the pipe sectionnearly unobstructed for further pumping.
Nominal inside diameters (ID) in mm (inch) 16 (5/8") - 16 (5/8")
Body material Aluminum

 

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