| 摘要 |
A normally closed regulator valve for controlling the pressure of flowing fluid and also for selectively fully enabling or stopping the flow. The regulator valve includes a valve housing having an inlet passage and an outlet passage connected by a flow passage with a seat surrounding the flow passage. A valve member is movable toward and away from contact with the seat. A control housing is attached to the valve housing. An elongated rod connected at one end to the valve member has an opposite end extending into the control housing. A rod partition, which may take the form of a rigid piston or a flexible diaphragm, is connected to the opposite end of the elongated rod and is movable in the control housing in sealing relation with the walls thereof. A compression spring is provided to bias the rod partition and the valve member in directions either toward or away from sealing engagement with the flow passage seat. An auxiliary partition, which may take the form of a rigid piston or a flexible diaphragm, is positioned in the control housing on the side of the rod partition away from the seat. A spacer is engageable with the rod partition to maintain a minimum spacing between the rod partition and the auxiliary partition. Alternately, a cup-shaped member with an integral spacer could be on the rod partition. First and second ports and a vent port are formed in the control housing and can be alternately connected by conduits to deliver pressure to move the valve member toward or away from the valve seat. A solenoid operated control valve or similar device is positioned in the conduit leading from the inlet passage for controlling the flow of fluid in this conduit.
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