The R-K NLB series pressure bypass valve is a 3-port valve designed to relieve excess fluid pressure in high purity applications where lubrication is not permitted. When mounted in-line, the pressure by-pass valve will permit fluid to pass through the system. When the fluid is vented through the bottom port.
Adjustable screw and lock-nut makes it easy to accurately pre-set relief pressure.
Wide working pressure range (10 to 80 PSIG)
Top entry for easy in-line maintenance and can be factory pre-set upon request.
It is ideal for DI water and other highly purity piping systems as well as most harsh chemicals and corrosives.
No metal contact with fluid Note:This valve is not designed to be used in piping systems with back-pressure on the downstram side.
Upstream Pressure Vacuum to 150 PSIG
Relief Pressure 10 to 80 PSIG
Pressure differential Plus or Minus 5 PSIG from any pre-set pressure relief point.
Material ValveBody PVC Type 1, Grade 1
Polypropylene
PVDF
Teflon
Piston Teflon
Diaphragm Primary Teflon
Backup EPDM
Seal EPDM
Viton(R)
Kalrez(R)
Pressure differential Plus or Minus 3 PSIG from any pre-set pressure relief point.
Temperature Range 0 F to 140 for PVC
0 F to 180 F for POLYPRO
0 F to 280 F for PVDF
0 F to 340 F for TEFLON
Valve ports 1/4" to 1" Valve FNPT
1.5" to 2" Valve MPT
All valves are fully ported
Mounting Method (4) 1/4" -20 tapped holes for
standard machine valve body.
(1/4" to 1.00")
Kalrez® and Viton® are registered trademarks of DuPont Dow Elastomers.
Order
Information
The chart below will specify R-K standard
valves regarding valve size, valve material, and seal material.
For special orders, please consult the factory for pricing
and delivery information.
