Hydraulic Pneumatic Valve Data: directional_poppet
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| directional_poppet | NFPA_D03_8gpm_dP40 | 4 | 3.5 | 1 | 5,000 | 8 | Poppet directional; near-zero leakage; lower dP than spool at same flow; typical Cv ~4.0 at D03 port | hydraulic_oil,water_glycol,phosphate_ester | 40 | 35 | NFPA_D03 |
| directional_poppet | NFPA_D05_20gpm_dP40 | 10 | 8.6 | 1 | 5,000 | 20 | Poppet D05; cavity-mounted; lower pressure drop; preferred for load-holding duty | hydraulic_oil,water_glycol,phosphate_ester | 40 | 50 | NFPA_D05 |
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