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Bulk Instrumentation and Accessories Instrument Valves & Manifolds •
Relief Valves RL4 Series
C
DESCRIPTION Parker RL4 Relief Valves are designed such that when the upstream pressure exceeds the closing force exerted by the spring, the lower stem opens, permitting flow through the valve. Flow hrough the valve increases proportionately to the increase in upstream pressure.
FEATURES
• Pressure settings are externally adjustable while the valve is in operation. Seven different spring ranges provide greater system sensitivity and enhanced performance.
• Manual override option with positive stem retraction is available for the full working pressures range.This option permits the user to relieve upstream pressure while maintaining the predetermined cracking pressure. • Color coded springs and labels indicate spring cracking range.
• Back pressure has minimum effect on cracking pressure. • Lock wire feature secures a given pressure setting.
SPECIFICATIONS Working pressure:
Cracking pressure: Up to 400 psig (28 bar) CWP
Up to 600 psig (41 bar) during relief with no internal seal damage.
Seven springs with the following ranges 10-25 psig (0.7-1.7 bar) 25-50 psig (1.7-3.4 bar) 50-100 psig (3.4-6.9 bar) 100-150 psig (6.9-10.3 bar)