Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2020.10
77/168
Physical and connection data
5.3 Mounting of suction isolation valve
The suction isolation valve is shipped separately from the factory, so it can be installed at various
positions in the suction line piping to the compressor.
Note: Do not install the valve at the compressor suction side with flow against the cone.
If the isolation valve is installed in this position, uneven flow is generated across the suction check
valve, which is mounted at the inlet to the compressor. This uneven flow causes the discs in the
check valve to strike against the stop pin and eventually damage the inside of the check valve.
If installing an elbow near the check valve, make sure that the plate is stressed evenly.
If the isolation valve is mounted at the compressor suction side, it should be installed with flow
across the cone. Please design your system piping accordingly.
If the suction isolation valve is installed as prescribed, we recommend a minimum distance to the
check valve of 2 x piping diameter. If it is not possible to install the valve as prescribed, or an el-
bow is installed, we recommend a distance of minimum 5 x pipe diameter to prevent damaging
the check valve.
Fig. 55: Correct placement.
Fig. 56: Alternative, but not recommended, placement
with longer distance to check valve.
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