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Picture of Parker 4Z-RH4A-BNT-SS-K1 - Relief Valves, 6,000 PSI - R Series

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Parker 4Z-RH4A-BNT-SS-K1 - Relief Valves, 6,000 PSI - R Series

Parker's R Series 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. Pressures range from 10 PSI (0.7 BAR) to 6,000 PSI (413.7 BAR).
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Brand Parker
Part No. 4Z-RH4A-BNT-SS-K1
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Products specifications
Attribute nameAttribute value
Maximum Operating Pressure350 psiMaximum Operating Temperature225 °F
Minimum Operating Temperature-30 °FConnection Size1/4 inch
Materials of ConstructionStainless Steel 316DivisionInstrumentation Products Division
Connection 1 SizeSingle Ferrule CompressionConnection 2 SizeSingle Ferrule Compression
Actuation TypeStandardFlow Coefficient0.41 Cv
Packing MaterialNitrile RubberCracking Pressure50 to 350 psi
Back-Up Washer MaterialPTFEConnection Size1/4"
Material316 Stainless SteelConnection 1 StyleSingle Ferrule Compression Fitting
Connection 2 StyleSingle Ferrule Compression FittingConnection Size 21/4"
ActuationStandardPacking MaterialNitrile Rubber
Cracking Pressure (psi)50 - 350
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