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PTFE Diaphragm
Relief, By-Pass, Anti-Siphon and Back Pressure Valves...
for Smooth, Sensitive Operation and the Ultimate in Corrosion Resistance
...with No Wetted Elastomers or Metals!
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 GeonŽ PVC, Natural Polypropylene
(virgin, unpigmented, unfilled PPL), KynarŽ PVDF and TeflonŽ PTFE body
materials. The wetted diaphragm is PTFE energized by a non-wetted VitonŽ
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.
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RVDT-050-VTF |
1/2" PORTS |
$675.00 |
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