Diaphragm {valves or} cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage {; Pinch valves} with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being mechanically actuated, e.g. by screw-spindle or cam
Diaphragm {valves or} cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage {; Pinch valves} with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being mechanically actuated, e.g. by screw-spindle or cam