| 摘要 |
The present invention provides a diaphragm valve moveable between a ful ly open position and a fully closed position, the valve comprising: a bonnet having a first thread and an abutment surface; a stem having at least one aperture and a second thread that cooperates with the first thread to allow the stem to be axially moveable relative to the bonnet; a handwheel being freely rotatable on the stem and freely axially slidable on the stem and having a stop with a surface for contacting the abutment surface of the bonnet; and a pin extending through the handwheel and into the at least one aperture in the stem for limiting rotary motion of the handwheel relative to the stem. In on e aspect of the invention, the at least one aperture is a slot. In another aspect of the invention, the at least one aperture is a plurality of apertures.</SDOAB > |
