Key Features
- Micro Pressure Sustaining Valve
- Back Pressure Valve Operation
- Direct-Acting Pressure Control
- Maintains Upstream Pressure
- 0.02 to 0.2 Bar Adjustment
- Regulation from Just 20 mbar
- Maximum Inlet Pressure 5 Bar
- Pressure Tested to 16 Bar
- Large Sensitive Diaphragm
- Precise Low-Pressure Control
- 1/2" to 2" BSPT Connections
- NPT & BSPP Thread Options
- DN15 to DN50 PN16 Flanges
- ANSI & JIS Flange Options
- 316 Stainless Steel Body
- Stainless Steel Internals
- 316 Stainless Pressure Gauge
- NBR Seals as Standard
- Optional FKM / Viton Seals
- Media Temperature to +80°C
- Air, Water, Gas & Light Oils
- Fluids up to 40 cSt
Datasheets
Description
Micro Pressure Sustaining Back Pressure Valve – Z-Tide RFMT / RFMF
The Z-Tide Industrial RFMT and RFMF Series are precision direct-acting micro pressure sustaining valves designed to maintain an exceptionally low and stable upstream pressure from just 0.02 Bar (20 mbar).
Operating as a pressure sustaining or back pressure valve (BPV), the RFMT / RFMF automatically responds to small changes in upstream pressure. When pressure falls towards the selected set point, the valve begins to close, restricting downstream flow and maintaining the required upstream pressure. As upstream pressure recovers, the valve progressively opens again.
Manufactured from 316 stainless steel and available with threaded connections from 1/2" to 2" or PN16 flanges from DN15 to DN50, the RFMT / RFMF is particularly suited to reverse osmosis, pure water, process systems, compressed air and other applications requiring accurate micro-pressure control. The manufacturer specifies a 0.02–0.2 Bar adjustable sustaining range across all sizes.
Valve Function & Operation
The RFMT / RFMF is a 2-way direct-acting pressure sustaining valve. Unlike a conventional pressure reducing valve that controls downstream pressure, a pressure sustaining valve regulates the pressure on its upstream or inlet side.
The large diaphragm provides the sensitivity required to detect very small pressure changes.
When upstream pressure falls towards the preset sustaining pressure, the valve progressively closes to restrict downstream flow and prevent the upstream pressure falling further.
When upstream pressure rises above the set point, the valve progressively opens to allow additional flow.
This provides automatic mechanical back pressure control without requiring an external pilot controller, electrical supply or pneumatic control signal.
Micro Pressure Regulation
Adjustable back pressure range: 0.02 to 0.2 Bar
Equivalent to approximately: 20 to 200 mbar
The same adjustable pressure range is specified across the RFMT threaded and RFMF flanged sizes.
This extremely low pressure range makes the valve particularly useful where conventional industrial back pressure regulators cannot provide sufficiently sensitive control.
Pressure & Performance
Back pressure adjustment: 0.02 to 0.2 Bar
Maximum inlet pressure: 5 Bar
Factory test pressure: 16 Bar
Maximum media viscosity: 40 cSt
Pressure indication: 316 stainless steel pressure gauge included
The supplied gauge indicates the sustained upstream pressure, allowing the valve setting and system pressure to be monitored directly.
RFMT Threaded Connections
The RFMT Series is available with:
1/2" BSPT – Cv 2.4
3/4" BSPT – Cv 9.0
1" BSPT – Cv 11.0
1½" BSPT – Cv 21.0
2" BSPT – Cv 25.0
Optional threaded connections include:
✓ NPT
✓ BSPP (G)
These Cv values and threaded sizes are confirmed by the manufacturer data.
RFMF Flanged Connections
The RFMF Series provides the same micro pressure sustaining function with industrial flanged connections.
Available sizes:
DN15
DN20
DN25
DN40
DN50
Standard flange: PN16
Optional flange standards include:
✓ ANSI 150 lb
✓ JIS10K
✓ JIS20K
Alternative NPT and BSPP connections and custom pressure, media and seal configurations are also listed as available options.
Construction & Materials
Body: 316 stainless steel
Cover: 316 stainless steel
Piston: 316 stainless steel
Shaft: 316 stainless steel
Spring cover: 316 stainless steel
Adjusting stem: 304 stainless steel
Fixing bolts: 304 stainless steel
Spring: Spring steel
Diaphragm: Nylon-reinforced EPDM
Standard sealing: NBR
Optional sealing: FKM
Media Compatibility
Suitable for:
✓ Compressed air
✓ Water
✓ Pure water
✓ Reverse osmosis water
✓ Compatible industrial gases
✓ Compatible light oils
✓ Compatible process fluids
Maximum fluid viscosity is 40 cSt. Final media suitability should always be confirmed against the selected seal materials and materials of construction.
Temperature Range
Media temperature: -15°C to +80°C maximum
The manufacturer also specifies a maximum viscosity of 40 cSt and permits mounting in any position.
Pressure Gauge
A 316 stainless steel pressure gauge is included with the RFMT / RFMF valve.
Unlike the gauge on a pressure reducing valve, this gauge monitors the upstream sustained pressure, providing a clear indication of the pressure being maintained by the valve.
Typical Applications
✓ Reverse Osmosis Systems
✓ Pure Water Systems
✓ Water Treatment Equipment
✓ Laboratory Installations
✓ Low Pressure Process Systems
✓ Compressed Air Systems
✓ Compatible Industrial Gases
✓ Chemical Processing Systems
✓ OEM Process Equipment
✓ Precision Back Pressure Control
Why Choose the RFMT / RFMF?
Most industrial pressure sustaining valves are intended for substantially higher operating pressures. The RFMT / RFMF is specifically designed for applications requiring very low back pressure regulation between 20 and 200 mbar.
Its large diaphragm detects small changes in upstream pressure, while the direct-acting mechanical design continuously adjusts the valve opening to maintain the selected pressure.
Combined with 316 stainless steel construction, threaded or flanged connections and an included pressure gauge, this makes the RFMT / RFMF particularly useful for specialist low-pressure process and water-treatment applications.
Ordering Information
Select the required valve configuration:
RFMT – Threaded micro pressure sustaining valve
RFMF – Flanged micro pressure sustaining valve
Then select the required connection size and seal material.
Standard sizes range from 1/2" to 2" threaded and DN15 to DN50 flanged.
Alternative thread standards, flange standards, seals and custom pressure configurations are available on request.
Related Products & Categories
Pressure Reducing Valves
Pressure Sustaining Valves
Pressure Relief Valves
Technical Specification
Brand: Z-Tide Co Ltd
Model: RFMT,RFMF
Width: 310.00 mm
Height: 310.00 mm
Depth: 70.00 mm
Weight: 6.00 kg
Valve / Product Type: Pressure Sustaining Valve
Body Material: Stainless Steel
Port Size: 1 thread, 1/2 thread, 11/2 thread, 2 thread, 3/4 thread
Operation: Direct Acting from 0 Pressure
Pressure: 0.02 Bar (20 mBar), 0.1 Bar (100 mBar), 0.2 Bar (200 mBar)
Seals: NBR, FKM (Viton)
Media: Air, Fluid (Non Aggressive), Fluid (Slight Acid/Alkali), Gases (Non Aggressive), Gases (Slight Acid/Alakli), Oils + Fuels 50cSt Max, Water, Water (RO/Pure/Demin)
Options required: Manual Control
Orifice: 15mm, 20mm, 25mm, 40mm, 50mm
Found in these Categories
DN15-50 1/2-2" Pressure Sustaining Valve 316SS 0.02-0.2 Bar
£1,742.66 incl. VAT £1,452.22 ex. VAT
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