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Bulk Instrumentation and Accessories Instrument Valves & Manifolds •
Relief Valves RH4 Series
DESCRIPTION Parker RH4 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 through the valve increases proportionately to the increase in upstream pressure.
FEATURES
• Pressure settings are externally adjustable while the valve is in operation. Eight different spring ranges provide greater system sensitivity and enhanced performance.
• Captured molded seat design is blow-out and chip resistant.
• Manual Override option with positive stem retraction is available for pressures up to 1500 psig (103 bar).This option permits the user to relieve upstream pressure while maintaining the predetermined cracking pressure. • Color coded springs and labels indicate spring cracking range.
• Lock wire feature secures a given pressure setting.
SPECIFICATIONS Working Pressure:
Cracking Pressure: Up to 6000 psig (414 bar) CWP.
Up to 8000 psig (552 bar) during relief with no internal seal damage.
Eight springs, from 50 psig to 6000 psig in the following ranges