Butterfly Valve Bi-directional valve installation
Butterfly Valve Bi-directional valve installation
(OP)
We have a twin 1600mm ductile iron water pipeline that can flow in either direction. Pressure is 11 bar. The pipeline is 100 km long with butterfly isolation valves at 5km intervals
The butterfly valves are installed on flanged spigots cast into the valve chamber wall with a flange adaptor on the downstream (normal direction of flow) side of the valve. In the normal direction of flow the closed valve body is therefore in tension.
If flow is in the opposite direction and the valve is closed the valve body will be in compression.
Is this arrangement (i.e closed valve body in compression) acceptable ?
The butterfly valves are installed on flanged spigots cast into the valve chamber wall with a flange adaptor on the downstream (normal direction of flow) side of the valve. In the normal direction of flow the closed valve body is therefore in tension.
If flow is in the opposite direction and the valve is closed the valve body will be in compression.
Is this arrangement (i.e closed valve body in compression) acceptable ?





RE: Butterfly Valve Bi-directional valve installation
For interest, what exactly do you mean by the donwstream flange being a "flange adaptor". Is this the cause of your concern by not being strong in axial force capacity? A diagram, drawing or sketch would be most useful.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Butterfly Valve Bi-directional valve installation
I do not have any concerns at all with this arrangement but I have got myself in the middle of an argument between the client and his design engineer.
RE: Butterfly Valve Bi-directional valve installation
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Butterfly Valve Bi-directional valve installation