Manual Diaphragm Valves sourcingAbout Manual Diaphragm Valves
Handwheel operated diaphragm valves in weir and straight through patterns, rubber, EPDM and PTFE diaphragms, DN15 to DN350, lined and stainless bodies.
Manual diaphragm valves are handwheel operated isolation and regulating valves in which a threaded spindle drives a compressor that presses the diaphragm onto the seat, a weir in weir-pattern bodies or the body floor in straight-through pattern bodies. The handwheel is normally non-rotating-stem with an indicating or rising-spindle option so the operator can read position, and better designs include an adjustable closing stop that prevents over-compression of the diaphragm, the most common cause of premature diaphragm failure in manual service. Because the diaphragm doubles as the stem seal there is no gland, so the valve is maintenance-light and suited to corrosive dosing lines, water treatment, effluent, dilute acids and alkalis and utility services. Indian manufacturers commonly supply cast iron, WCB and CF8M bodies, rubber, neoprene, EPDM, butyl and PTFE-faced diaphragms, linings to suit the medium, and sizes from DN15 to DN350, flanged to ASME B16.5 Class 150 or EN 1092 PN10/16 with screwed small bores. An enquiry should state pattern, size, body and lining materials, diaphragm grade, medium, concentration and temperature, pressure, end connections, quantity and any locking or indication requirements.
