| 摘要 |
A valve comprising a gate closure member which is actuated by a stem that is operatively connected with the valve operator handle at the upper end of the stem and the lower end of the stem connected to a toothed pinion engaging an arcuate toothed rack on the gate thereby rotating the gate, or to a toothed pinion engaging a linearly straight toothed rack on the gate thereby reciprocating the gate across the fluid flow-path in a direction transverse to the stem axis, an when the closure member is a tapered wedge gate, the stem is operatively connected with the valve operator handle by means of a Lift-and-Turn mechanism. |
