Direct-operated pressure relief valve PSFA series

stainless steelback pressurepoppet

This direct-acting valve is ideally suited for low pressure hydraulic applications where a safety relief valve with extremely low leakage is needed to seal the system when closed. The valve’s fast opening response helps to prevent system damage from pressure spikes. Minimum cracking pressures are available from 20-100 psid. - Zero Leak Relief Valve - Diameter: 0.187 inches - Full Open Lohm Rate: 750 Lohms max - Nominal System Pressure: Up to 3000 psi - Cracking Pressure Range: 20 to 100 psi General Performance - Leakage at Minimum Cracking Pressure: 0 Drops in a 1 Minute Test - Leakage at Minimum Shutoff Pressure: 0 Drops in a 1 Minute Test - Nominal Weight: 1.5 grams - Test Fluid: MIL-PRF-83282 at 85°F Materials - Body: 15-5PH CRES, AMS 5659 - Poppet: 303 CRES, QQ-S-763C - Spring: 17-7PH CRES, AMS 5678 - Optional Shims: 300 Series CRES, ASTM A 666 - Pin: 17-4PH CRES, AMS 5643 - Elastomeric Seat (Option 1): Flourocarbon, AMS-R-83485 or AMS-R-83248 - Elastomeric Seat (Option 2): EPDM, AMS-R-83285 Finish: All CRES parts passivated. Pins are prewaxed. Do not degrease. Do not lubricate. Replacement Parts & Accessories - PART NUMBER: CUTA1870110C, Installation / Extraction Tool Set - PART NUMBER: CSFA1870003A, Replacement Pin - Flow Curve and Cross Section Views available in the gallery images. - For more information, see the Technical Hydraulic Handbook of Aerospace, Energy, and Motorsport Solutions (Page F16-F17). - Part numbers and technical specifications are available for various configurations (Forward/Reverse flow, Fluorocarbon/EPDM seat, cracking pressures from 20 to 100 psid). - Installation and extraction procedures, as well as CAD envelopes, are available upon request. Key Technical Specifications: - Valve Type: Direct-acting, zero-leak pressure relief valve - Diameter: 0.187 inches - Nominal System Pressure: Up to 3000 psi - Cracking Pressure Range: 20 to 100 psi - Full Open Lohm Rate: 750 Lohms max - Nominal Weight: 1.5 grams - Materials: 15-5PH CRES (body), 303 CRES (poppet), 17-7PH CRES (spring), 300 Series CRES (shims), 17-4PH CRES (pin), Flourocarbon or EPDM (seat) - Finish: All CRES parts passivated; pins prewaxed - Test Fluid: MIL-PRF-83282 at 85°F - Leakage: 0 drops in a 1-minute test at both minimum cracking and shutoff pressure