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 RLLT 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 RLLT 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 threaded BSPT connections from ½" to 2", the RLLT Series is ideal for reverse osmosis systems, laboratory equipment, compressed air systems and sensitive 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
Port sizes: ½", ¾", 1", 1½" and 2" BSPT
Optional threads:
NPT
BSPP (G)
Mounting position: Pressure gauge upright
Adjusting stem downward
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 and improve reliability
✓ Heavy-duty 316 stainless steel construction for corrosive industrial 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
OEM machinery
Low-pressure process water
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 RLLT 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 delivers excellent regulation accuracy and long service life, while the supplied stainless steel pressure gauge provides continuous monitoring of inlet pressure. 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 port size, pressure relief setting and seal material before adding the valve to your basket. Optional NPT or BSPP (G) threads, Duplex 316 stainless steel construction, FKM (Viton®) or EPDM seals and alternative pressure adjustment ranges are available on request.
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
