The choice of valves have always to be taken considering the limitations and availabilities given. Most important: - Process, function, material, fluid and physical requirements and details - Commercial availability - Official and factory safety limitations and requirements Within this framework your choice should end up with theBall Valves valve with the best or optimum cost over lifetime. Starting with Resilient Seated Gate Valvescommercial availability and checking against your other parameters, you could well end up with the Automatic Control Valvesanswer to your question that the reason is production cost for valves and commercial competition among Butterfly Valvesvalve producers, and no real technical reason related to your process. Searching theBellows Seal Valves world-wide market you could even end up with the same conclusion the other way: both types available and possible to use, but the one more competitive or more commonly used for your process or in your area, or for this specific pressure class and connection type.

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