Direct-operated pressure relief valve PRFA series

This direct-acting valve is ideally suited for low pressure hydraulic applications where a fast-opening safety valve is needed to prevent system damage from pressure spikes. Minimum cracking pressures are available from 20-100 psid. An integral safety screen is available for added protection. - Safety Relief Valve - Diameter: 0.187 inches - Full Open Lohm Rate: 400 Lohms max. - Nominal System Pressure: Up to 3000 psi - Cracking Pressure Range: 20 to 100 psi General Performance - Tolerance on Cracking Pressure: ± 10% - Full Open Lohm Rate: Unscreened: 400 Lohms Maximum, Screened: 460 Lohms Maximum - Lohm Rate at 125% of Actual Crack: Unscreened: 1100 Lohms Maximum, Screened: 1500 Lohms Maximum - Restriction at Min. Recommended Valve Lift: 1500 Lohms Maximum - Reseat Leakage (90% of Actual Crack): 10 Drops / Minute Maximum - Shutoff Leakage (85% of Actual Crack): 10 Drops / Hour Maximum - Nominal System Pressure: up to 3000 psi - Screen Hole Size (Screened Version Only): 0.008 inches Nominal - Nominal Weight: Unscreened: 1.5 grams, Screened: 1.7 grams - Test Fluid: MIL-PRF-83282 at 85°F Materials - Body: 303 CRES, Specification: QQ-S-763C - Pin: 17-4PH CRES, Specification: AMS 5643 - Spring: 17-7PH CRES, Specification: AMS 5678 - Ball: 440C CRES, Specification: AMS 5630 - Cage: 303 CRES, Specification: QQ-S-763C - Spring Seat: 303 CRES, Specification: QQ-S-763C - Ball Follower: 303 CRES, Specification: QQ-S-763C - Screen (Screened Version Only): 304L CRES, Specification: ASTM A 666 - Braze (Screened Version Only): -, Specification: AMS 4774 Finish: All CRES parts passivated. Pins are prewaxed. Do not degrease. Do not lubricate. Replacement Parts & Accessories - PART NUMBER: CUTA1870104C, DESCRIPTION: Installation / Extraction Tool Set - PART NUMBER: JETA1870004A, DESCRIPTION: Replacement Pin - Flow Curve and Cross Section Views available in the image gallery. - Screened and unscreened configurations available. Key Technical Specifications - Valve Type: Direct-acting pressure relief valve - Cracking Pressure Range: 20-100 psid - Nominal System Pressure: Up to 3000 psi - Diameter: 0.187 inches - Full Open Lohm Rate: 400 Lohms max (unscreened), 460 Lohms max (screened) - Screen Hole Size (Screened Version): 0.008 inches nominal - Nominal Weight: 1.5 g (unscreened), 1.7 g (screened) - Materials: 303 CRES, 17-4PH CRES, 17-7PH CRES, 440C CRES, 304L CRES - Test Fluid: MIL-PRF-83282 at 85°F