12 Application technology Specifications for foot valves Opening pressure and pressure losses Item no. Female thread Nominal width Opening pressure p0 (mbar) Pressure loss pf (mbar) 16.1691 G1/2 15 23 130 16.1693 G3/4 20 20 154 16.1694 G1 25 17 78 16.1696 G1¼ 33 13.4 74 16.1697 G1½ 40 12.3 78 16.1699 G2 50 10.2 52 16.1625 G2½ 63 8.9 36 16.1630 G3 75 4.6 22 16.1640 G4 100 4.5 14 Calculation of pump suction capacity Units: 1 g/cm2 ≈ 1 mbar = 1 cm WS required suction capacity, pump: Hp = ∆H + pf ∆H ... suction height (well) Hp ... suction capacity Example: - Suction height = 5 m - Foot valve G¾ (No. 1693) pf = 154 cm WS required suction capacity = 6.5m 225 GEKA® Main Catalogue
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