Key Features
✓ Direct-acting pressure sustaining / back pressure valve
✓ Automatically maintains a constant minimum upstream pressure
✓ 1–5 Bar or 4–10 Bar adjustable pressure ranges
✓ Alternative pressure ranges available on request
✓ Balanced piston and diaphragm design for stable pressure regulation
✓ Fast response to changing downstream flow demand
✓ Direct-acting operation requires no external pilot controller
✓ ½", ¾", 1", 1½" and 2" BSPT connections
✓ Optional NPT or BSPP (G) threads
✓ Heavy-duty 316 stainless steel construction
✓ Optional Duplex stainless steel construction
✓ Maximum inlet pressure 25 Bar
✓ Pressure tested to 35 Bar
✓ Flow capacity from Cv 2.5 to 17 according to valve size
✓ Stainless steel upstream pressure gauge included
✓ NBR seals as standard
✓ Optional FKM (Viton) or EPDM seals
✓ Maximum media temperature up to +100°C with FKM or EPDM seals
✓ Suitable for compressed air and compatible industrial gases
✓ Suitable for water, pure water and RO water
✓ Suitable for compatible light oils up to 40 cSt
✓ Precision UH-ring sealing for low leakage and long service life
✓ Simple external pressure adjustment on ½" to 1" models
✓ Protected concealed adjustment on 1½" and 2" models
Description
316 Stainless Steel Pressure Sustaining Valve – Z-Tide Industrial RFT Series
The Z-Tide Industrial RFT Series is a precision direct-acting pressure sustaining and back pressure valve designed to automatically maintain a constant minimum upstream pressure in industrial water, compressed air, gas and compatible process fluid systems.
Manufactured from 316 stainless steel with a balanced piston and diaphragm design, the RFT provides stable and repeatable back pressure regulation despite changes in downstream demand. Available in threaded sizes from ½" to 2", with adjustable pressure ranges up to 10 Bar, the RFT is particularly suited to water treatment, RO systems, compressed air, chemical processing and industrial applications requiring dependable upstream pressure control.
Valve Function & Operation
Function: Direct-acting pressure sustaining valve
Alternative function: Back pressure valve (BPV)
Operating principle: Balanced piston and diaphragm
The valve automatically regulates flow to maintain the selected minimum pressure on the upstream side of the valve. If upstream pressure begins to fall below the set point, the valve restricts flow to protect and sustain the required upstream pressure. As upstream pressure increases, the valve opens further to allow additional flow downstream.
Pressure gauge: Displays sustained inlet / upstream pressure
Port sizes: ½", ¾", 1", 1½" and 2" BSPT
Optional threads:
NPT
BSPP (G)
Mounting position: Pressure gauge upright with adjusting stem downward
Pressure & Regulation
Maximum inlet pressure: 25 Bar
Pressure tested: 35 Bar
Back pressure adjustment ranges:
1 to 5 Bar
4 to 10 Bar
Alternative pressure ranges available on request
Minimum media temperature: -15°C
Maximum media temperature:
NBR: +60°C
FKM (Viton): +100°C
EPDM: +100°C
Maximum media viscosity: 40 cSt
Flow capacity: Cv 2.5 to 17 according to valve size
Construction & Materials
Body: 316 stainless steel
Optional body: Duplex stainless steel
Upper cover: 316 stainless steel
Piston: 316 stainless steel
Shaft: 316 stainless steel
Diaphragm: NBR or FKM
UH-ring: NBR or FKM
Spring: Spring steel
Lower cover: 316 stainless steel
Adjusting stem: 304 stainless steel
Pressure gauge: Stainless steel gauge included
Standard seals: NBR
Optional seals:
FKM (Viton)
EPDM
Media Compatibility
✓ Compressed air
✓ Industrial gases
✓ Water
✓ Pure water
✓ Reverse osmosis (RO) water
✓ Light oils
✓ Fluids under 40 cSt compatible with the valve materials
Performance & Design
✓ Maintains the selected minimum upstream pressure regardless of normal changes in downstream demand
✓ Balanced piston and diaphragm design provides stable and repeatable back pressure regulation
✓ Direct-acting design provides automatic pressure control without an external pilot system
✓ Precision piston and diaphragm provide fast response to changing system conditions
✓ UH-ring sealing helps minimise leakage and provides reliable long-term operation
✓ Stainless steel pressure gauge provides continuous visual indication of sustained upstream pressure
✓ External adjustment screw on ½" to 1" models allows straightforward pressure setting
✓ Concealed adjustment mechanism on 1½" and 2" models helps prevent accidental or unauthorised pressure changes
✓ 316 stainless steel construction provides excellent corrosion resistance for demanding water and industrial process applications
Typical Applications
Industrial water systems
Reverse osmosis (RO) systems
Pure water installations
Water treatment plants
Compressed air systems
Industrial gas systems
Chemical processing
Light oil systems
Pump and upstream equipment protection
OEM machinery
Process engineering
Applications requiring stable minimum upstream pressure
Manufacturing Quality
Manufactured from heavy-duty 316 stainless steel with precision-machined internal components, the Z-Tide Industrial RFT Series is engineered for reliable and repeatable upstream pressure regulation in demanding industrial environments.
The balanced piston and diaphragm design automatically maintains the selected back pressure despite changing downstream demand, while precision UH-ring sealing provides excellent sealing performance, rapid response and long service life.
The supplied stainless steel pressure gauge continuously displays the sustained upstream pressure for straightforward commissioning and monitoring. On ½" to 1" models, an external adjustment screw provides convenient pressure setting, while the concealed adjustment mechanism used on 1½" and 2" models helps protect the setting against accidental adjustment.
Optional Duplex stainless steel construction, alternative seal materials, thread standards and pressure adjustment ranges are available for specialist applications.
Ordering Information
Simply select the required port size, back pressure adjustment range and seal material before adding the valve to your basket.
Standard sizes are ½", ¾", 1", 1½" and 2" BSPT, with optional NPT or BSPP (G) threads available.
NBR seals are standard, with FKM (Viton) or EPDM options available. Optional Duplex stainless steel construction and alternative pressure adjustment ranges are also available on request.
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