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Shanghai EK Controls Co., Ltd.
A Brief Overview of the Principles, Applicable Applications, and Operating Conditions of Butterfly Valves
2017-03-26
Because the disc of a butterfly valve exhibits a wiping action during operation, most butterfly valves are suitable for service with media containing suspended solid particles; depending on the strength of the sealing elements, they can also be used for powdery and granular media.
Butterfly valves feature a compact structural length and overall height, rapid opening and closing, low fluid resistance in the fully open position, and precise flow control when opened to between approximately 15° and 70°.
Butterfly valves are recommended for the following operating conditions:
① Requires throttling and regulating control of flow;
② Mud media and media containing solid particles;
③ Applications requiring a short valve body length;
④ Applications requiring fast opening and closing speeds;
⑤ Applications with a small pressure differential.
Butterfly valves are suitable for applications involving two-position control, throttling in the flow passage, low noise levels, cavitation and vaporization, minor leakage to the atmosphere, and abrasive media.
When butterfly valves are used under special operating conditions—such as throttling control, stringent sealing requirements, severe wear, or cryogenic (deep-cold) service—it is necessary to employ specially designed, triple-eccentric or double-eccentric butterfly valves equipped with metal-sealed, adjustable actuators.
Using the device
Connect the cable cores to the corresponding terminals in accordance with the electrical control requirements, and properly seal the cable entry. At the same time, secure the cable to prevent damage to the cable connections due to external pulling forces. When the valve is in the “fully closed” position, rotate the lower closing cam clockwise or the upper opening cam counterclockwise. During pipeline clamping, ensure that the connection force is uniform and reliable. After installation of the butterfly valve, the valve disc must be in the open position during pipeline pressure testing. Following installation, the butterfly valve should be inspected regularly, with the following key inspection items: check for damage to the valve seat and O-ring seals; verify the sealing performance of the valve disc sealing surface; ensure that there is no binding or obstruction when the valve is opened and closed after maintenance and reassembly; and conduct a sealing performance test as required after maintenance and reassembly.
Shanghai EK Controls Co., Ltd.
Tel: +86 021-31009135
Phone: +86 13917280488
Email: mandy.chen@ekcontrol.com
Address: Caohejing Pujiang High-Tech Park, Minhang District, Shanghai
Room A502, Building 22; Room B103, No. 588 Xinjun Huanlu
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