Hydraulic Pneumatic Valve Data: pressure_relief
Flow coefficients and performance data for hydraulic and pneumatic directional, pressure, and flow control valves — NFPA D03 through D10 body sizes and pneumatic 1/8" to 1" NPT port sizes. Covers Cv, Kv, nominal flow, pressure drop, leakage, response time, hysteresis, and frequency response.
| valve type | size flow key | Cv flow coefficient (gpm/psi^0.5) | Kv metric (m3/hr/bar^0.5) | leakage rate cc per min (cc/min) | max pressure psi (psi) | nominal flow gpm (gpm) | notes | operating fluid | pressure drop at rated flow psi (psi) | response time ms (ms) | size designation |
|---|---|---|---|---|---|---|---|---|---|---|---|
| pressure_relief | NFPA_D03_10gpm_dP0 | 3.5 | 3 | 50 | 5,000 | 10 | Direct-acting pressure relief; crack-to-reseat dP ~60-80 psi; internal leakage at set pressure; Cv at full open | hydraulic_oil,water_glycol,phosphate_ester | 0 | 30 | NFPA_D03 |
| pressure_relief | NFPA_D05_25gpm_dP0 | 7 | 6 | 100 | 4,500 | 25 | D05 pilot-operated relief; set range 100-3500 psi; leak at set = internal pilot flow ~0.3 gpm | hydraulic_oil,water_glycol,phosphate_ester | 0 | 40 | NFPA_D05 |
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