Hydraulic Pneumatic Valve Data: check
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) | size designation |
|---|---|---|---|---|---|---|---|---|---|---|
| check | NFPA_D03_15gpm_dP10 | 15 | 13 | 0.5 | 5,000 | 15 | Ball/poppet check; 0.4 cc/min max leak at set pressure; full-flow dP ~10 psi; crack pressure 5-15 psi | hydraulic_oil,water_glycol,phosphate_ester | 10 | NFPA_D03 |
| check | NFPA_D05_35gpm_dP10 | 36 | 31.1 | 0.5 | 5,000 | 35 | Pilot-operated check; used for load holding; pilot ratio 3:1 to 4.5:1; near-zero leak when closed | hydraulic_oil,water_glycol,phosphate_ester | 10 | NFPA_D05 |
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