| 摘要 |
A valve of the ball type having a ported rotatable valve member (i.e., valve ball) within a valve body, and a sealing assembly which provides a seal between the body and the valve member. The sealing assembly includes a metal ring having non-metallic resilient sealing means which contacts the valve working surface of the valve ball. The fluid pressure areas of the sealing assembly are such that line pressure for flow in either direction does not cause the seal between the sealing means and the valve member to be broken. The ring is fitted and guided within the valve body in such a manner as to prevent cocking. The non-metallic resilient sealing means carried by the metal ring provides a double seal on two concentric areas, and ducts permit communication with the space between such sealing areas from the exterior of the body. Preferably only one sealing assembly is employed, and this is located in that portion of the body which is integral with the main portion of the body, whereby the remaining welded-on body part may be applied in the final phases of manufacture without disturbing the alignment of the valve member or injury to the sealing assembly.
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