Description
316 Stainless Steel Low Pressure Sustaining (Back Pressure) Valve – Z-Tide Industrial RFLT Series
The Z-Tide Industrial RFLT Series is a precision direct-acting low pressure sustaining valve designed to maintain a constant upstream (back) pressure in low-pressure industrial and process systems. Manufactured from 316 stainless steel with a balanced piston and large diaphragm design, the RFLT Series provides exceptionally sensitive back pressure regulation while maintaining stable upstream pressure despite fluctuating flow conditions. Available with threaded BSPT connections from ½" to 2", with optional NPT or BSPP (G) threads, these valves are ideally suited to reverse osmosis systems, laboratory installations, compressed air systems and sensitive process applications requiring accurate low-pressure control.
Valve function & operation
Function:
Direct-acting pressure sustaining valve
Low-pressure back pressure valve
Operating principle: Balanced piston and large diaphragm
Automatically maintains a constant upstream pressure
Pressure gauge displays sustained upstream pressure
Port sizes: ½", ¾", 1", 1½" and 2" BSPT
Optional threads:
NPT
BSPP (G)
Mounting position: Pressure gauge upright
Adjusting stem downward
Pressure ranges & regulation
Maximum inlet pressure: 5 Bar
Pressure tested: 16 Bar
Back pressure adjustment range: 0.2 to 1.5 Bar
Pressure gauge: 316 stainless steel gauge included
Maximum media temperature:
+60°C with NBR seals
+100°C with FKM seals
Minimum media temperature: -15°C
Maximum media viscosity: 40 cSt
Flow capacity: 34.6 to 360.4 L/min
(According to valve size)
Construction & materials
Body: 316 stainless steel
Optional body: Duplex 316 stainless steel
Upper cover: 316 stainless steel
Piston: 316 stainless steel
Shaft: 316 stainless steel
Large diaphragm: EPDM or FKM
UH-ring: NBR or FKM
Spring: Spring steel
Lower cover: 316 stainless steel
Pressure gauge: 316 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 a constant upstream (back) pressure regardless of downstream demand
✓ Balanced pressure system provides stable, repeatable pressure regulation
✓ Large diaphragm delivers excellent sensitivity at very low pressures
✓ Precision piston and UH-ring sealing minimise leakage and improve regulation accuracy
✓ Stainless steel pressure gauge provides continuous monitoring of sustained pressure
✓ Heavy-duty 316 stainless steel construction for corrosive industrial environments
✓ Compact direct-acting design requires no external pilot controller
Applications
Reverse osmosis (RO) systems
Water treatment plants
Laboratory installations
Chemical processing
Industrial compressed air systems
Low-pressure process water
Gas control systems
OEM equipment
Precision back pressure control
General industrial process engineering
Manufacturing quality
Manufactured using heavy-duty 316 stainless steel with precision-machined internal components, the Z-Tide Industrial RFLT Series has been engineered for industrial applications requiring exceptionally accurate low-pressure sustaining control. The balanced piston and large diaphragm design provide outstanding sensitivity while maintaining a constant upstream pressure despite changing downstream demand. Precision UH-ring sealing enhances regulation accuracy, reduces leakage and provides excellent long-term durability, while the supplied 316 stainless steel pressure gauge allows continuous monitoring of sustained pressure. Optional Duplex stainless steel construction, alternative seal materials and custom pressure 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. Optional NPT or BSPP (G) threads, Duplex 316 stainless steel construction, FKM or EPDM seals, alternative pressure ranges and flanged RFLF versions are available on request.
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