The diaphragm valve is essentially a simple pinch clamp, closed by pressing a flexible diaphragm against transverse weir, when fully closed, the diaphragm seats against the weir providing a leak tight closure. The diaphragm valves are recommended...
Control valves pneumatic actuated globe type control valves actators direct acting(air to open, fail to close) reverse acting(air to close, fail to open), spring return diaphragm, spring return piston types two-way three-way mixing or diverting size...
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