| 摘要 |
A valve assembly comprises a housing, a movable member, a fixed member, and a resilient member. The seat element has an upstream side, a downstream side, and an outlet port providing fluid communication therebetween, with the seat element fixed in a flow control segment adjacent a valve outlet. The drain element, operable between a first axial position closest to an inlet structure, and a second axial position abutting an upstream surface of the fixed seat element, is retained upstream from the fixed seat element and includes an upstream side, a downstream side, and a plurality of inlet ports through the drain element providing fluid communication therebetween. The resilient element is disposed axially within a middle fluid chamber defined by a portion of the flow control segment located between the fixed seat element and the movable drain element, the resilient element applying a first biasing force to urge the drain element upstream toward the first position, urging the valve into an open, flow permissive configuration.
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