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PTFE Diaphragm
Relief, By-Pass, Anti-Siphon and Back Pressure Valves...

FEATURES:

One valve design functions as a relief valve, by-pass valve, pump backpressure valve, anti-siphon valve, and backpressure regulator.

 

• Relief: protects systems and equipment from over-pressure/pressure surges.
• By-Pass: prevents pumps from "dead heading".
• Back-Pressure: maintains necessary reverse pressure in closed loop systems.
• Anti-Siphon: Used on the outlet of a pump wherever gravity or other downstream conditions may create negative pressure (siphon) and drain a tank. The valve is pre-set to open under pump pressure, but closes bubble-tight when the pump is shut off. Because of the design of the RVDT, this valve actually closes more tightly when unwanted siphon occurs.
• Unique PTFE Diaphragm is excellent for use with highly aggressive liquids...and also provides the ultimate in contamination-free sealing.
• Rugged thermoplastic construction is ideal for a broad range of industrial applications.
• Relief setting is infinitely adjustable from 5 psi to 100 psi.
• Maximum inlet pressure is 150 psi.
• Large diaphragm area delivers more sensitivity and less pressure drop under flow conditions.
• Non-wetted u-cup seal provides a second isolation of the control spring; design includes patented Fail-Dry vent, a safety feature that provides visual warning of seal malfunction and permits the valve to continue operation until a scheduled maintenance can be planned thereby avoiding a costly shutdown.
• Non-leaching feature of fluoropolymer diaphragm makes it ideal for use with ultra-pure water and concentrated etchants, as in the semiconductor industry.
• Available in 1/4", 1/2", 3/4" sizes. For other sizes consult factory.

   

Materials of Construction, Manufacturing Process & Quality Assurance:

Series RVDT relief valves are available in Geon® PVC, Natural Polypropylene (virgin, unpigmented, unfilled PPL), Kynar® PVDF and Teflon® PTFE body materials. The wetted diaphragm is PTFE energized by a non-wetted Viton® diaphragm. Spring housing (not wetted) is PVC. Springs (not in wetted area) are zinc-plated steel, external fasteners are stainless steel. Lock nut and adjusting screw are HDPE. If your environment is incompatible with any of the external materials, or you are interested in some other type of body material, options are available on quantity or special orders.

Valve bodies are machined on state-of-the-art CNC lathes and machining centers. Parts are individually inspected prior to assembly. Valves are hand assembled, then inspected. Assembled valves are 100% individually tested (while pressurized) prior to shipment. All operations performed in our plant in Cedar Grove, NJ.

Optional Class 100 cleanroom cleaning and packing including wipe, rinse, Triton flush, nitrogen flush, DI rinse, nitrogen purge/dry, flourescent inspection, capping & 6 mil PE bag and heat seal available upon request. Performed at a certified remote location; priced per valve.

Larger valve shown in photo has a Natural Polypropylene body. Spring housing (completely non-wetted) is Geon PVC, but can be constructed of the wetted body material for a slightly higher cost. Cutaway example in photo is an all-PVC valve.