PTFE Diaphragm Relief, By-Pass, Anti-Siphon and Back Pressure Valves
Series RVDT & RVDTM

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

应用程序:

• Relief:从排泄/保护系统和设备pressure surges.
• By-Pass:prevents pumps from "dead heading".
• Back-Pressure Regulator:maintains necessary reverse pressure in closed loop systems.
• Back-Pressure Valve:enhance pump performance by maintaining backpressure on the pump outlet
• 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 valveactually closes more tightlywhen unwanted siphon occurs.

Plastic Body Materials, Sizes & Features:

• Geon� PVC and Corzan� CPVC body materials in 1/4", 1/2", 3/4", 1", 1 1/2", 2" and 3" sizes.
• Natural Polypropylene and Kynar� PVDF body materials in 1/4" - 2" sizes.
• PTFE body material offered in 1/4" - 1" sizes.
• Relief setting is infinitely adjustable from 5 psi to 100 psi.
• Maximum inlet pressure is 150 psi.
• Diaphragm material is PTFE for all sizes and body materials, and is excellent for use with highly aggressive liquids...provides the ultimate in contamination-free sealing.
• Rugged thermoplastic construction is ideal for a broad range of industrial applications.
• 大的隔膜区域提供更多的年代ensitivity and less pressure drop under flow conditions.
• Non-wetted u-cup seal provides a second isolation of the control spring; design includes patentedFail-Dryvent, a safety feature that provides visual warning of seal malfunction. This permits the valve to continue operation until a scheduled maintenance can be planned thereby avoiding a costly shutdown. Fail-Dry connection on Series RVDT is 1/8" FNPT.
• Non-leaching feature of fluoropolymer diaphragm makes it ideal for use with ultra-pure water and concentrated etchants, as in the semiconductor industry.

Metal Body Materials, Sizes & Features:

• 316L Stainless Steel body offered in 1/2", 3/4", and 1" sizes. For other grades/metals, please consult factory.
• Relief setting is infinitely adjustable from 5 psi to 100 psi.
• Maximum inlet pressure is 400 psi at 75� F. With PVC spring housing, pressure is derated accordingly at higher temperatures. Alternate spring housing materials are available; please consult factory.
• Diaphragm material is PTFE for all sizes.
• Rugged construction is ideal for a broad range of industrial applications.
• 大的隔膜区域提供更多的年代ensitivity and less pressure drop under flow conditions.
• Non-wetted u-cup seal provides a second isolation of the control spring; design includes patentedFail-Dryvent, a safety feature that provides visual warning of seal malfunction. This permits the valve to continue operation until a scheduled maintenance can be planned thereby avoiding a costly shutdown. Fail-Dry connection on Series RVDT is 1/8" FNPT.
• Non-leaching feature of fluoropolymer diaphragm makes it ideal for use with high purity applications.

Materials, Manufacturing Process & Quality Assurance:

Materials used in addition to the body include PTFE wetted diaphragm energized by a non-wetted FKM 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 on 1/4" - 1" and 3" sizes. Lock nut and adjusting screw are stainless steel on 1�" and 2" sizes. 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 packingincluding 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.

The standard valves are precision machined from the highest quality brand thermoplastic bar stock with female NPT connections. 1/2" sizes in Geon PVC, Corzan CPVC, Natural Polypro & Kynar PVDF, as well as 1" sizes in Geon PVC, Natural Polypro & Kynar PVDF are molded with a choice of FNPT or socket connections. Spigot connections & flare fittings are also available on all sizes. For orders of 25 or more valves, connections can be provided with male threads, sockets, unions, etc. Please consult our Technical Group for more information, (973)256-3000.

Mounting

1/2" size in PVC, CPVC, Natural Polypro & Kynar PVDF, as well as 1" sizes in PVC, Natural Polypro & Kynar PVDF have integral mounting lugs on the base of the body, as shown at right. This is in addition to mounting holes in the base. These sizes and materials can be ordered optionally without the mounting lugs if desired.

All other sizes & materials have threaded mounting holes in the base.

Gauge Ports & Fail Dry Port

1/2" size in PVC, CPVC, Natural Polypro & Kynar PVDF have opposing 1/8" NPT gauge ports on the side of the body, on the same plane as the piping connections, as shown at right. 1" size in PVC, Natural Polypro & Kynar PVDF have opposing 1/4" NPT gauge ports on the side of the body, on the same plane as the piping connections, as shown at right. The gauge ports are not tapped unless so ordered; incurs small charge. On the standard body, the untapped port has no effect on flow or performance. Gauge ports are not readily available on other size/material combinations; please consult factory for alternatives.

The threaded port above the piping connection is the patented Fail-Dry early warning vent. Fail-Dry is standard on all sizes and materials.

3" Body Style

Offered in PVC or CPVC, the heavy duty 3" size is visually different from smaller sizes due to a compression fabricated body and multi-diameter spring housing. Internally the valve is virtually identical to the smaller sizes; it provides the same PTFE diaphragm sealing and the highest flow rates in the industry.

Each of the 3" RVDT valves are precision machined on state-of-the art CNC machines. They are then individually compression fabricated and assembled by hand, and individually tested under pressure. The design minimizes production waste and facilitates an ultra-heavy duty connection thickness, offered in NPT, socket, BSP, JIS, DIN, and custom fittings.

Dimensions ¼" - 2":

For3" dimensions, see below

Dimensions 3":

Part Numbers:

Note Concerning "V" Part Numbers:Previous part numbering of the RVDT Series had a second "V" in place of the second "T" -- for example, RVDT075T-PV was formerly RVDT075V-PV. The second "V" indicated the backing seal material, Viton, rather than the primary seal material, PTFE. In 2009 the nomenclature was changed to eliminate confusion. The valves are the same.

Flow Reference Charts:

NOTE: Flow performance tested with city water under laboratory conditions; your results may vary. Solid lines representrecommended flow rangefor that pipe size.

CAD Files

HELPFUL LINKS: