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Always follow standard safety procedures when working on a valve.
Check valves must be installed such that the arrow on the body of
the valve points in the direction of desired fluid flow.
All check valves should be installed at least ten pipe diameters away
from upstream pumps, elbows, fittings or equipment.
Velan check valves without springs should be installed with the bonnet
up, and the angle of incline should be no more the 45° from horizontal.
Also, the roll angle of the valve bonnet should be no more than 45°
from side to side.
For vertical installation of a tilting check valve, special disc machining
is required if vertical installation was not specified during quotation
stage.
Verify with Velan Engineering if the flow meets the minimum flow requirements
of the valve in question. Low flows can cause disc chatter, wear of
the seat and disc, and erosion.
Check valves in multiple pump circuits may require special
designs to prevent slang due to inadvertent pump trip. Verfiy flows,
pump coast-down characteristics. Consult with Velan
Engineering to ensure trouble-free service.
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