Pneumatic Diaphragm Valves sourcingAbout Pneumatic Diaphragm Valves
Pneumatically actuated diaphragm valves for automated dosing and process isolation, fail-close, fail-open and double acting, weir and straight through bodies.
A pneumatic diaphragm valve pairs a weir or straight through diaphragm valve body with a compact air actuator, piston or rolling-diaphragm type, mounted in place of the handwheel bonnet assembly. Spring-return actuators give fail-close or fail-open action on air failure, while double acting units use air for both strokes where fail position is unimportant and higher thrust is wanted. The combination automates chemical dosing, water and effluent treatment, CIP routing and batch process isolation, with solenoid valves for on-off switching, limit switch boxes for position feedback, and positioners where the valve must modulate flow in a control loop. Because the process diaphragm still provides glandless isolation, the actuated valve keeps the corrosion and contamination advantages of the manual type. Indian manufacturers commonly supply cast iron, WCB and CF8M bodies with rubber, EPDM, butyl and PTFE-faced diaphragms, sizes DN15 to DN250 and larger on request, flanged to ASME B16.5 Class 150 or EN 1092 PN10/16. An enquiry should state body pattern and materials, diaphragm grade, medium and temperature, line pressure, available air supply pressure, fail action, accessories and quantity.
