Diaphragm valve having adjustable closure means

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