Patent ID: 6095193
Filing Date: 2000-08-01
Classification: F16K,Y10T

Abstract:
A smooth vent valve, comprisinga valve body having an inlet and an outlet,a flow path within the valve body communicating the inlet with the outlet for flow of a fluid in a downstream direction from the inlet to the outlet,an on-off valve in the flow path, the on-off valve including a main valve element,a flow control valve in the flow path in series with and downstream of the on-off valve, the flow control valve including a sub-valve element having a sub-valve shaft portion,an on-off valve actuator in the body for selectively cycling the on-off valve between a closed position and an open position,a flow control valve actuator in the body for selectively cycling the flow control valve between a throttling position and an open position so that when the on-off valve is in the open position, the flow control valve can be switched from the throttling position to the open position and thereby change the rate of fluid flow along the flow path from the inlet to the outlet from a slower rate to a higher rate, anda sub-shaft bellows provided around the sub-shaft portion of the sub-valve element, the sub-shaft bellows being connected at one end thereof to the sub-valve element and being connected at the other end thereof to the main valve element.