| 摘要 |
A pressure regulator valve including a valve seat separating a fluid flowpath into an upstream region and a downstream region. A valve closure member is mounted on a valve stem, the valve stem operable to vary a separation between the valve seat and the valve closure member. A diaphragm is mounted in a housing, mobile portions of the diaphragm responding to changes of pressure in the downstream region by changing position relative to the housing. A diaphragm stem is attached to the diaphragm such that movement of the mobile portions of the diaphragm causes movement of the diaphragm stem. A linkage mechanically couples the diaphragm stem to the valve stem. The linkage includes four connected links, the links attached to each other at connection points. The linkage having a mechanical advantage which varies as the positions of the diaphragm stem and valve stem change.
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