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

for Smooth, Sensitive Operation and the Ultimate in Corrosion Resistance...
with No Wetted Elastomers!

FEATURES:

One valve design functions as a relief valve, by-pass valve, and back pressure valve.
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.
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.
Large diaphragm area delivers more sensitivity and less pressure drop under flow conditions.
Patented Fail-Dry safety feature 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 PTFE® makes it also ideal for use with ultra-pure water and concentrated etchants, as in the semiconductor industry.
Available in 1/4", 1/2", 3/4", 1" and 1 1/2" sizes. Others on request.

MATERIALS OF CONSTRUCTION:

Series RVDT relief valves are available in PVC, Polypropylene, PVDF (Kynar@) and PTFE@ body materials. The wetted diaphragm is PTFE® energized by a non-wetted Viton@ diaphragm. Springs (not in wetted area) are zinc-plated steel, fasteners are stainless steel and adjusting screw is high-density polyethylene.

Dimensions: