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Hydraulic Valve CETOP Sizing & Flow Calculator
Size CETOP/ISO 4401 valves based on flow rate and pressure drop. Calculate the required flow coefficient Kv (in L/min/√bar), power loss, and recommended valve size.
Results
Flow Capacity (Kv)
Unit convention: this calculator uses the hydraulics convention with Kv in L/min/√bar — the flow in L/min of water (SG = 1) that produces a 1 bar pressure drop. The standard metric valve coefficient (VDI/VDE 2173, IEC 60534) is defined as water flow in m³/h at 1 bar, so Kv [m³/h] = 0.06 × Kv [L/min/√bar]. Always check which convention a manufacturer’s catalogue uses before comparing values. Note that ISO 4401 standardizes only the valve mounting interface — not the flow coefficient convention.
Power Loss
CETOP Size Reference
| CETOP | NG | P,T Ports | A,B Ports | Bolts | Face (mm) | Typical Kv (L/min/√bar) | Daloy (L/min) |
|---|---|---|---|---|---|---|---|
| 03 | NG6 | G3/8 | G3/8 | 4×M5 | 69.9×36.5 | 8–12 | 40–80 |
| 05 | NG10 | G1/2 | G1/2 | 4×M6 | 102.4×56.4 | 15–25 | 80–120 |
| 07 | NG16 | G3/4 | G3/4 | 4×M8 | 152×80 | 30–50 | 120–350 |
| 08 | NG25 | G1 | G1 | 4×M10 | 197×102 | 55–80 | 350–600 |
| 10 | NG32 | G1-1/4 | G1-1/4 | 4×M12 | 255×130 | 90–120 | 600–1000 |
Praktikal na Halimbawa
Kinakailangang Kv = 80 / √(8/0.87) = 80 / 3.03 = 26.4 L/min/√bar (≈ 26.4 × 0.06 = 1.6 m³/h in the standard metric Kv convention)
CETOP 05 has typical Kv = 15–25 → borderline → CETOP 07 (NG16) recommended
Power loss = 80 × 8 / 600 = 1.07 kW
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