BIS Valves Type RL50 Relief Valve, internally adjusted. Model range: 200 to 15,000 psi 15K spring range: 4,000 to 15,000 psi Set pressure: Customer to advise when ordering Connections: 1/2 inch NPT female ports. Internal adjustment via A/F hex key. 'WD' ~ 17/4 St.St Seat for Water Duty, 316SS
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