Description
Flanged 316 Stainless Steel Direct-Acting Pressure Relief (Limiting) Valve – Z-Tide Industrial RLF Series
The Z-Tide Industrial RLF Series is a precision direct-acting pressure relief valve designed to protect industrial water, compressed air and process systems from excessive pressure. Manufactured from 316 stainless steel with a balanced piston and diaphragm design, the RLF Series provides fast, accurate pressure limiting while maintaining reliable long-term operation. The valve remains closed during normal operation and automatically opens when the preset pressure is reached, safely relieving excess pressure before gently resealing as system pressure returns below the set value. Available with flanged connections from DN15 to DN150, the RLF Series is ideally suited to industrial process systems, water treatment plants, compressed air installations and demanding corrosive environments.
Valve function & operation
Function:
Direct-acting pressure relief valve
Pressure limiting valve (PLV)
Safety over-pressure protection
Operating principle: Balanced piston and diaphragm
Automatically opens when preset pressure is reached
Automatically reseals as pressure falls below the set value
Pressure gauge displays inlet pressure
Flange sizes: DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100 and DN150
Standard flange: PN16
Optional flange standards:
ANSI 150 lb
PN25
Pressure ranges & relief settings
Maximum working pressure: 25 Bar
Pressure tested: 35 Bar
Pressure relief adjustment ranges:
1 to 5 Bar
4 to 10 Bar
8 to 13 Bar
Alternative pressure ranges available on request
Maximum media temperature:
+60°C with NBR seals
+100°C with FKM (Viton®) seals
Minimum media temperature: -15°C
Maximum media viscosity: 40 cSt
Flow capacity (Cv): 2.5 to 170
(According to valve size)
Construction & materials
Body: 316 stainless steel
Optional body: Duplex 316 stainless steel
Flanges: DN15–DN50: 316L stainless steel welded flanges
DN65–DN150: CF8M stainless steel flanges
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
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
✓ Demineralised water
✓ Light oils
✓ Fluids under 40 cSt compatible with the valve materials
Performance & design
✓ Automatically limits system pressure by rapidly relieving excess pressure
✓ Balanced pressure system provides accurate and repeatable pressure relief
✓ Precision piston and reinforced diaphragm deliver fast response with excellent regulation accuracy
✓ UH-ring sealing system minimises leakage while extending service life
✓ Stainless steel pressure gauge provides continuous monitoring of inlet pressure
✓ Heavy-duty flanged construction for industrial process pipework
✓ Corrosion-resistant 316 stainless steel construction for demanding industrial environments
✓ Factory pressure tested for dependable long-term operation
Applications
Compressed air systems
Industrial water distribution
Water treatment plants
Reverse osmosis (RO) systems
Chemical processing
Gas pressure control
Light oil systems
Food and beverage production
Industrial safety pressure protection
General process engineering
Manufacturing quality
Manufactured using heavy-duty 316 stainless steel with precision-machined internal components, the Z-Tide Industrial RLF Series has been engineered for dependable over-pressure protection in demanding industrial environments. The balanced piston and diaphragm design provide rapid, accurate pressure relief when the preset limit is reached, while the UH-ring sealing system enhances sealing performance, minimises leakage and delivers excellent long-term durability. Heavy-duty flanged construction, corrosion-resistant materials and factory pressure testing ensure reliable operation throughout the valve's service life. Optional Duplex 316 stainless steel construction, alternative pressure adjustment ranges and PN25 flange configurations are available for specialist applications.
Ordering information
Simply select the required flange size, pressure relief setting and seal material before adding the valve to your basket. Optional ANSI 150 lb or PN25 flanges, Duplex 316 stainless steel construction, FKM (Viton®) or EPDM seals and alternative pressure adjustment ranges are available on request.
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