Port Size: 1/2 inch Flange DN15, 3/4 Flange DN20, 1 inch Flange DN25, 11/4 inch Flange DN32, 11/2 inch Flange DN40, 2 inch Flange DN50
Operation: Direct Acting
Pressure: 0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.5 Bar
The Z-Tide Industrial RLLF Series is a precision direct-acting low pressure relief valve designed to protect low-pressure industrial and process systems from excessive pressure. Manufactured from 316 stainless steel with a balanced piston and large diaphragm design, the RLLF Series provides highly accurate pressure limiting while maintaining fast response and reliable 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 the system returns below the set pressure. Available with PN16 flanges from DN15 to DN50, with optional ANSI 150 lb or JIS10K flanges, the RLLF Series is ideally suited to water treatment plants, reverse osmosis systems, laboratories and industrial process applications.
Valve function & operation
Function:
Direct-acting pressure relief valve
Pressure limiting valve (PLV)
Safety over-pressure protection
Operating principle: Balanced piston and large 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, DN40 and DN50
Standard flange: PN16
Optional flange standards:
ANSI 150 lb
JIS10K
Pressure ranges & relief settings
Maximum working pressure: 10 Bar
Pressure tested: 16 Bar
Pressure relief adjustment range: 0.3 to 1.5 Bar
Alternative pressure ranges available on request
Maximum media temperature:
+60°C with NBR seals
+100°C with FKM (Viton®) seals
+100°C with EPDM seals
Minimum media temperature: -15°C
Maximum media viscosity: 40 cSt
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: Stainless steel gauge included
Standard seals: NBR
Optional seals:
FKM (Viton®)
EPDM
Media compatibility
✓ Water
✓ Pure water
✓ Reverse osmosis (RO) water
✓ Demineralised water
✓ Compressed air
✓ Industrial gases
✓ Light oils
✓ Fluids compatible with the valve materials
Performance & design
✓ Automatically limits system pressure by rapidly relieving excess pressure
✓ Balanced pressure system provides highly accurate low-pressure relief
✓ Large diaphragm delivers exceptional sensitivity and repeatable operation
✓ Precision piston and UH-ring sealing minimise leakage while improving long-term reliability
✓ Heavy-duty flanged construction for industrial process pipework
✓ Corrosion-resistant 316 stainless steel construction for demanding environments
✓ Direct-acting design requires no external pilot controller
Applications
Reverse osmosis (RO) systems
Water treatment plants
Laboratory installations
Chemical processing
Compressed air systems
Gas control equipment
Low-pressure process water
OEM equipment
Industrial safety pressure protection
General industrial fluid systems
Manufacturing quality
Manufactured using heavy-duty 316 stainless steel with precision-machined internal components, the Z-Tide Industrial RLLF Series has been engineered for reliable low-pressure over-pressure protection in demanding industrial environments. The balanced piston and large diaphragm design provide exceptional sensitivity while ensuring rapid pressure relief when the preset limit is reached. Precision UH-ring sealing enhances sealing performance, minimises leakage and provides excellent long-term durability, while the supplied stainless steel pressure gauge allows continuous monitoring of inlet pressure. Heavy-duty flanged construction, corrosion-resistant materials and factory pressure testing ensure dependable operation throughout the valve's service life. Optional Duplex 316 stainless steel construction, alternative seal materials and custom pressure adjustment ranges 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 JIS10K flanges, Duplex 316 stainless steel construction, FKM (Viton®) or EPDM seals and alternative pressure adjustment ranges are available on request.
Port Size:
1/2 inch Flange DN15, 3/4 Flange DN20, 1 inch Flange DN25, 11/4 inch Flange DN32, 11/2 inch Flange DN40, 2 inch Flange DN50
Operation:
Direct Acting
Pressure:
0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.5 Bar
