| 摘要 |
<p>A valve (10) including: a bonnet (20); a body (30) secured to the bonnet (20) and including at least two ports (100,110) and at least one weir (80) positioned between the ports; a valve stem (90) being movably coupled with the bonnet (20), the valve stem (90) including first and second longitudinal ends, and a recess (200) in the first longitudinal end; a diaphragm (60) positioned substantially adjacent to the second end of the valve stem (90) so as to be deflectable towards the weir (80) by the valve stem (90) to restrict a flow between the ports (100,110); a handwheel (120) rotatably secured to the valve stem (90) so as to enable a torque to be applied to the valve stem (90), the handwheel (120) including a longitudinal aperture (160); and, a screw (240) directed through and engaged with the handwheel aperture (160) and being selectively engagable within the recess (200) of the valve stem (90), such that the valve stem (90) and handwheel (120) remain in a constant relative longitudinal position with respect to one another, and when the diaphragm (60) sets against the weir (80) the handwheel (120) abuts the bonnet (20) to serve as a closing lift valve stop.</p> |
