Manual two or three port control valve - is operated manually or by differential fluid pressure and has floating obturator between two chambers of valve body

摘要

The two or three port control valve can be operated manually or by fluid pressure. The central part of the of the valve has two chambers connected together at the outside. An obturator is positioned to float in the flow of fluid. A skirt is moved either through a handwheel (3) and a rack and pinion (4,16) or by differential fluid pressure through channels (10) passing through the end plates (6) and the centre spigot (13) into chambers (11,12) either side of a piston (15) attached to the skirt. Pref. there is a spring (17) on one side of the piston (15).