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Triple offset butterfly valves with no keyways or pins

Offshore oil rig

The problem with conventional triple offset butterfly valves

Standard Triple Offset Butterfly valves, both gearbox and actuated with primarily a wafer lugged design are often installed in offshore applications. The butterfly discs are mechanically operated through the use of pins or keyways along the drive chain. This design reduces the strength of the shaft by compromising its integrity, and in high flow applications this weakening is exposed and can often lead to the disc and shaft shearing (breaking off), leaving the valve inoperable, irreparable and the Oil Rig in need of a replacement!

Hobbs Triple Offset Butterfly Valves with no keyways or pins

The innovative design of Hobbs Valve Triple Offset Butterfly Valve means there are no keyways or pins into the shaft of the valve. The Hobbs valve incorporates a square shaft, which runs along the full length of the drive chain. This means the disc can be bolted in position rather than using keys or pins, and the integrity of the shaft is strengthened, rather than compromised. This eliminates the problems of a weaker shaft and the problem of shearing during high velocity applications.
Bolted shaft butterfly valve

The design also uses free floating cylindrical bearings meaning the torque required to operate the valves is kept to a minimum at all times, and is significantly lower than standard Triple Offset Butterfly Valves.

For more information on Hobbs revolutionary butterfly valve disc design, read a real-life application story here.

Company Profile

Hobbs Valve Limited

Hobbs Valve are UK based and are at the forefront of innovation, designing and manufacturing high performance Triple Offset Butterfly Valves for the global Industries of Oil and Gas, Chemical, Petrochemical, Nuclear, Marine and Power.

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