Structure and Working Principle
• The dual - action throttle stop valve has a more complex structure compared to a single - function throttle stop valve. It often features a pressure - balanced structure. The valve disc may have a special design with two - stage throttling elements. When the valve is opened, the fluid first passes through a fixed throttling orifice at the bottom of the valve seat for primary throttling, and then through another throttling orifice formed by the opening of the valve sleeve and the end surface of the valve core for secondary throttling. This two - stage throttling design can effectively reduce the impact of high - pressure fluid on the sealing pair.
• It also usually has a pressure - balancing function for the valve core. When the valve is opened or closed, the balance pressure helps to reduce the operating torque, making the operation lighter and reducing the wear and tear of the sealing pair during closing.
Features
• High - Performance Throttling: With two - stage throttling, it can handle large throttling pressure differences, achieving significant throttling effects, especially suitable for high - pressure fluid systems.
• Low - Torque Operation: Thanks to the pressure - balanced structure, the torque required for opening and closing is greatly reduced, which not only makes the operation more convenient but also extends the service life of the valve.
• Enhanced Sealing: The dual - sealing design of the valve core and valve seat ensures excellent sealing performance, meeting the requirement of gas - medium leakage - free operation.
Applications
Mainly applied in natural gas exploitation, gathering, desulfurization, and natural gas treatment pipelines. For instance, in natural gas long - distance transmission pipelines, it can be used to regulate the gas flow and ensure the stable operation of the pipeline system; in gas treatment plants, it can control the flow of gas during various treatment processes.
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