Description
Flanged 316 Stainless Steel Low Pressure Reducing Valve – Z-Tide Industrial RELF Series
The Z-Tide Industrial RELF Series is a precision direct-acting low pressure reducing valve designed for highly accurate downstream pressure control in sensitive water, air, gas and industrial process applications.
Manufactured from 316 stainless steel with a balanced piston and large diaphragm design, the RELF provides stable outlet pressure across an adjustable 0.3 to 1.5 Bar range, even when inlet pressure or downstream demand changes. A special micro-pressure version down to approximately 0.02 Bar is also available for exceptionally low-pressure applications.
Available with PN16 flanges from DN15 to DN50, with optional ANSI 150 lb or JIS10K flanges, the RELF is particularly suited to RO and pure water systems, water treatment, laboratories, chemical processing and other applications requiring precise low-pressure regulation.
Valve Function & Operation
Function: Direct-acting low pressure reducing valve
Control: Automatic downstream pressure regulation
Operating principle: Balanced piston and large diaphragm
The valve automatically regulates flow to maintain the selected downstream pressure. The large diaphragm provides increased sensitivity at low pressures, while the balanced piston design helps maintain stable outlet pressure despite normal variations in inlet pressure.
Pressure gauge: 0–2 Bar glycerine-filled stainless steel gauge displaying regulated outlet pressure
Flange sizes: DN15, DN20, DN25, DN40 or DN50
Standard flange: PN16
Optional flange standards:
ANSI 150 lb
JIS10K
Pressure & Regulation
Maximum inlet pressure: 10 Bar
Pressure tested: 16 Bar
Standard outlet pressure adjustment range: 0.3 to 1.5 Bar
Micro-pressure version: Approximately 0.02 Bar available on special order
Alternative pressure ranges available on request
Minimum media temperature: -15°C
Maximum media temperature:
NBR: +60°C
FKM (Viton): +100°C
Maximum media viscosity: 40 cSt
Construction & Materials
Body: 316 stainless steel
Optional body: Duplex stainless steel
Upper cover: 316 stainless steel
Piston: 316 stainless steel
Diaphragm support: 316 stainless steel
Lower cover: 316 stainless steel
Shaft: 316 stainless steel
Spring: Spring steel
Standard seals: NBR
Optional seals:
FKM (Viton)
EPDM
Pressure gauge: 0–2 Bar glycerine-filled stainless steel gauge included
Media Compatibility
✓ Pure water
✓ Reverse osmosis (RO) water
✓ Process water
✓ Compressed air
✓ Industrial gases
✓ Light oils
✓ Fluids under 40 cSt compatible with the valve materials
Performance & Design
✓ 0.3–1.5 Bar regulation range provides precise control for sensitive low-pressure systems
✓ Special 0.02 Bar micro-pressure version provides a solution for exceptionally low regulated pressures
✓ Large diaphragm provides excellent sensitivity to small changes in downstream pressure
✓ Balanced piston design maintains stable outlet pressure despite inlet pressure variations
✓ Precision UH-ring sealing helps minimise leakage and improve regulation accuracy
✓ Fast response maintains pressure stability as downstream demand changes
✓ Direct-acting operation eliminates the need for a separate external pilot system
✓ 0–2 Bar glycerine-filled pressure gauge provides clear, vibration-resistant outlet pressure indication
✓ Heavy-duty flanged construction provides secure installation into industrial process pipework
✓ 316 stainless steel construction provides excellent corrosion resistance for demanding water and process applications
Typical Applications
Reverse osmosis (RO) systems
Pure water systems
Water treatment plants
Low-pressure process water systems
Chemical processing
Laboratory installations
Pharmaceutical manufacturing
Industrial compressed air systems
Compatible industrial gas systems
OEM equipment
Sensitive instrumentation and process equipment
Ultra-low pressure applications with micro-pressure version
Manufacturing Quality
Manufactured from heavy-duty 316 stainless steel with precision-machined internal components, the Z-Tide Industrial RELF Series is engineered specifically for applications requiring accurate and repeatable low-pressure regulation in flanged process pipework.
The balanced piston and large diaphragm design provides excellent sensitivity across the standard 0.3 to 1.5 Bar adjustment range, helping maintain stable downstream pressure despite normal variations in inlet pressure and flow demand.
Precision UH-ring sealing enhances regulation accuracy, minimises leakage and provides reliable long-term operation. The supplied 0–2 Bar glycerine-filled stainless steel pressure gauge provides clear outlet pressure indication and helps dampen pointer movement in installations subject to vibration or pressure pulsation.
For particularly sensitive applications, a special micro-pressure version capable of regulating down to approximately 0.02 Bar is available on request, together with optional Duplex stainless steel construction, alternative seals and flange standards.
Ordering Information
Simply select the required flange size, outlet pressure range and seal material before adding the valve to your basket.
Standard sizes are DN15, DN20, DN25, DN40 and DN50 with PN16 flanges. Optional ANSI 150 lb or JIS10K flanges are available on request.
NBR seals are standard, with FKM (Viton) or EPDM options available. Optional Duplex stainless steel construction, alternative pressure ranges and the special micro-pressure version are also available on request.
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