CONTROL VALVE an INTRODUCTION | Butterfly Valve APPLICATION

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Control Valve>Rotary Valve>Butterfly Valve

Butterfly valves shall be considered for the following circumstances:
- if the required size would make it economically attractive (usually due to a high flow rate
with a low pressure drop);
- if eccentric plug / segmented ball or globe valves are not suitable;
- for corrosive services, where body lining of globe valves becomes economically
Unattractive.

Double or triple eccentric butterfly valves, also known as high performance (HP) butterfly valves, can be used in Class V or VI TSO applications in accordance with IEC 60534-4. They can handle high temperatures and high differential pressures. The applicable MESC buying descriptions and MESC additional requirements (Specifications, or SPEs) for butterfly valves shall be selected from the appropriate piping class in accordance with requirements.

NOTE: Spring-opening butterfly valves should not be of the wafer or lug type but should have a valve body to allow removal of the valve from the piping system with the disc in 'open' position. Alternatively, a spring-opening wafer or lug type butterfly valve may be provided with a hand wheel or upstream and downstream spool pieces. The provision of a hand wheel requires the Principal's approval.

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