6 Installation at Site
39 of 60
A minimum pressure is required for opening. If this minimum pressure is not reached,
the spring can be dismantled.
Table32: Opening pressures (p
o
) as a function of flow direction in mbar
DN
↔ ↓ ↑ ↑
Without spring
15 20 16 24 4
20 20 16 24 4
25 20 16 24 4
32 20 16 24 4
40 20 15,5 24,5 4,5
50 20 15 25 5
65 20 14,5 25,5 5,5
80 20 13,5 26,5 6,5
100 20 13,5 26,5 6,5
125 20 32 12
150 20 34 14
200 20 35 15
NOTE
Flow through lift check valves must be in the direction of the arrow on the valve
body. Valves without spring can only be installed in vertical pipes with upward
flow.
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