| 摘要 |
A three-way valve includes a rotatable shaft positioned within a cylindrical, linear bore within a housing. A fluid pressure source is coupled via an input port to an inner end of the bore which includes a valve chamber. An output port coupled to a pressure-operated device is also disposed in the housing and is connected to the valve chamber, as is a drain port. Attached to the shaft's inner end is a first seal, while a second seal is attached to the shaft in closely spaced relation to the first seal. Rotational displacement of the shaft clockwise causes the first seal to seal off the source of fluid pressure from the valve chamber, while allowing for fluid discharge through the drain port. Rotational displacement of the shaft in a second, opposed direction connects the pressure-operated device to the pressure source via valve chamber and isolates valve chamber from drain port. |
| 主权项 |
1. A three-way valve, comprising:
a housing formed to include a bore extending into the housing, the bore formed to include a first valve seat, a tubular sleeve having a first end and a second end spaced apart from the first end and formed to include an internal passageway extending from the first end to the second end, the first end of the sleeve positioned within the bore of the housing, the first end of the sleeve formed to include a second valve seat, the second valve seat spaced apart from the first valve seat when the sleeve is received in the bore to define a valve chamber between the first and second valve seats, a stem positioned in the internal passageway of the sleeve and configured to move relative to the sleeve within the internal passageway, and a mounting member coupled to the stem and positioned within the valve chamber, the mounting member including a first compressible seal member positioned to engage with the first valve seat and a second compressible seal member positioned to engage with the second valve seat, wherein the housing is further formed to include an input port in fluid communication with the valve chamber, an output port in fluid communication with the valve chamber, and a drain passageway in fluid communication with the valve chamber, the mounting member movable between a first position where the first compressible seal member is engaged with the first valve seat to block fluid from passing through the input port, a second position where the second compressible seal member is engaged with the second valve seat to block fluid from passing through the drain passageway, and a third position between the first and second positions to allow fluid to flow through any of the input port, output port, or drain passageway. |
