Please take care of insulation also.
*working pressure is also important:
-Types of b/f valves:
1. Resilient butterfly valve which has a flexible rubber seat. Working pressure 232 PSI

2. High performance butterfly valve which is usually double eccentric in design. Working pressure up to 725 PSI

3. Tricentric butterfly valve which is usually with metal seated design. Working pressure up to 1450 PSI
*Butterfly valves are valves with a circular body and a rotary motion
disk closure member which is pivotally supported by its stem.

A Butterfly valve can come in various styles including eccentric and high-performance valves.

These are normally a type of valve that uses a flat plate to control the flow of water.

As well as this, Butterfly valves are used on fire apparatus and
typically are used on larger lines, such as front and rear suctions and
tank to pump lines.

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