Datasheet Content
PTFE DIAPHRAGM RELIEF,
BY-PASS, ANTI-SIPHON
AND BACK PRESSURE VALVES
Series RVDT & RVDTM
APPLICATIONS:
One valve design functions as an all-purpose backpressure valve in many
applications:
• Relief: protects systems and equipment from over-pressure/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
valve actually closes more tightly when unwanted siphon occurs.
PLASTIC BODY MATERIALS & SIZES:
• PVC and Kynar® PVDF body materials in 1/4" - 4" sizes.
• CPVC body materials in 1/4" - 2" sizes.
• Natural Polypropylene body materials in 1/4" - 2".
• PTFE body material offered in 1/4" - 1" sizes.
• Relief setting is infinitely adjustable from 5 psi to 125 psi. METAL BODY
5-100 psi on 3" and 4" sizes. MATERIALS & SIZES:
• Maximum inlet pressure is 150 psi. • 316 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 125 psi.
• Maximum inlet pressure is 150 psi at 75ºF. With
PVC spring housing, pressure is de-rated
accordingly at higher temperatures. Alternate
spring housing materials are available; please
consult factory.
RVDT-0423-C-1
FEATURES: MATERIALS, PIPING CONNECTIONS
• Diaphragm material is PTFE for all sizes and body materials, and is & QUALITY ASSURANCE:
excellent for use with highly aggressive liquids...provides the
Materials used in addition to the body include PTFE wetted diaphragm
ultimate in contamination-free sealing.
energized by a non-wetted FKM diaphragm. Springs (non-wetted) are
• Large diaphragm area delivers more sensitivity and less pressure zinc plated music wire, 11⁄2", 2", 3" & 4" springs are powder coated
drop under flow conditions. chrome silicon. External fasteners are stainless steel. Lock nut and
• Non-leaching feature of fluoropolymer diaphragm makes it ideal for adjusting screw are thermoplastic, except 4" size is stainless steel.
use with ultra-pure water and concentrated etchants, as in the Alternate materials available by special order.
semiconductor industry.
Female NPT and schedule 80 sockets available on all sizes. Spigots,
• Non-wetted u-cup seal provides a second isolation of the control
flanges, flare fittings and other connections available on most sizes/
spring; design includes patented Fail-Dry vent, a safety feature that
provides visual warning of seal malfunction. This permits the valve materials. Please consult our Technical Group for more information,
to continue operation until a scheduled maintenance can be planned (973) 256-3000. Assembled valves are 100% individually tested (while
thereby avoiding a costly shutdown. Fail-Dry connection is 1/8" FNPT; pressurized) prior to shipment. All operations performed in our plant in
1/4" FNPT 3" AND 4" sizes. Cedar Grove, NJ.
MOUNTING: 3" AND 4" BODY STYLE
The 1/2" and 1" sizes in PVC, CPVC, Natural Polypro & Kynar PVDF The heavy duty 3" and 4" sizes are visually different from smaller sizes
have integral mounting lugs on the base of the body. All other sizes & but internally the valve is virtually identical; it provides the same PTFE
materials have threaded mounting holes in the base. diaphragm sealing and the highest flow rates in the industry.
Each of the 3" and 4" RVDT valves are precision machined, then
GAUGE PORTS: fabricated and assembled by hand, and individually tested under
The 1/2" and 1" sizes in PVC, CPVC, Natural Polypro & Kynar PVDF pressure. Connections are available in NPT, socket, BSP, JIS, DIN,
have opposing 1/8" NPT gauge ports on the side of the body, on the flanged, and custom fittings.
same plane as the piping connections. 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 sizes or on 1/2" PTFE body; please
consult factory for alternatives.
PIPE Natural Stainless
SIZE PVC CPVC Polypro PTFE PVDF Steel
⁄4"
1
RVDT025T-PV RVDT025T-CP RVDT025T-PP RVDT025T-TF RVDT025T-PF *
⁄2"
1
RVDTM050T-PV RVDTM050T-CP RVDTM050T-PP RVDT050T-TF RVDTM050T-PF RVDT050T-SS
3
⁄4" RVDT075T-PV RVDT075T-CP RVDT075T-PP RVDT075T-TF RVDT075T-PF RVDT075T-SS
1" RVDTM100T-PV RVDTM100T-CP RVDTM100T-PP RVDT100T-TF RVDTM100T-PF RVDT100T-SS
11⁄2" RVDT150T-PV RVDT150T-CP RVDT150T-PP * RVDT150T-PF *
2" RVDT200T-PV RVDT200T-CP RVDT200T-PP * RVDT200T-PF *
3" RVDT300T-PV * * * RVDT300T-PF *
4" RVDT400T-PV * * * RVDT400T-PF *
* Consult Factory
Part numbers shown are for threaded connections. For sockets, add an “S” after the second “T” example: RVDT050TS-PV.
RVDT-0423-C-2
RVDT(M) 1/4" - 1" FLOW CHART
TESTED WITH CITY WATER*
RVDT 1-1/2", 2", 3" & 4" FLOW CHART
TESTED WITH CITY WATER*
OVERPRESSURE (PSI)
* Tested under laboratory conditions; your results may vary. Solid lines represent recommended
flow range for that pipe size.
RVDT-0720-C-3
PIPE D D1 D2 D3
MODEL
SIZE IN. MM. IN. MM. IN. MM. IN. MM.
RVDT025 1
⁄4" 2.00 50.8 1.63 41.4 - - - -
RVDT(M)050 1
⁄2" 2.50 63.5 1.63 41.4 2.97 75.4 3.36 85.3
RVDT075 3
⁄4" 3.00 76.2 2.00 50.8
RVDT(M)100 1" 3.50 88.9 2.00 50.8 4.10 104.1 4.69 119.1
RVDT150 11⁄2" 5.00 127.0 - - - - - -
RVDT200 2" 6.00 152.4 - - - - - -
RVDT300 3" 10.0 254.0 5.25 133.0 - - - -
RVDT400 4" 11.5 292.0 5.38 137.0 - - - -
PIPE H H1 H2 T
MODEL
SIZE IN. MM. IN. MM. IN. MM. THREAD SIZE/HOLE SIZE
RVDT025 1
⁄4" 6.15 156.2 0.47 11.9 4.77 121.2 #8-32
RVDT(M)050 1
⁄2" 5.83 148.0 0.69 17.4 4.35 110.4 8-32/#8 THRU HOLE
RVDT075 ⁄4" 8.98 228.1 0.78 19.8 6.17 156.7 1/4" - 20
3" & 4" sizes differ visually from
3
RVDT(M)100 1" 11.38 289.1 1.19 30.2 8.38 212.9 1/4"-20 / 1/4" CLEARANCE smaller sizes
RVDT150 11⁄2"…
