{"id":1688,"date":"2025-12-11T09:00:00","date_gmt":"2025-12-11T09:00:00","guid":{"rendered":"https:\/\/www.tgvalve.com\/?p=1688"},"modified":"2025-12-17T00:28:47","modified_gmt":"2025-12-17T00:28:47","slug":"centerline-butterfly-valves-guide","status":"publish","type":"post","link":"https:\/\/www.tgvalve.com\/ar\/blog\/butterfly-valve\/centerline-butterfly-valves-guide\/","title":{"rendered":"\u0645\u0627 \u0647\u0648 \u0635\u0645\u0627\u0645 \u0627\u0644\u0641\u0631\u0627\u0634\u0629 \u0627\u0644\u0645\u0631\u0643\u0632\u064a\u061f"},"content":{"rendered":"\n

A centerline butterfly valve is a valve design where the stem axis, disc center, and body center align in the same position. This simple construction makes it one of the most common butterfly valve types used in water systems and low-pressure applications.<\/p>\n\n\n\n

\"What<\/figure>\n\n\n\n

How Butterfly Valves Work<\/strong><\/h2>\n\n\n\n

The valve operates through a straightforward mechanism. When you pull the handle clockwise or counterclockwise, it rotates the stem. The stem then turns the disc 90 degrees to open or close the valve. This means the disc sits directly in the flow path when closed, creating a seal against the valve seat.<\/p>\n\n\n\n

Centerline valves rely on compression to seal. As the disc rotates from 0 to 90 degrees during closing, it gradually compresses the rubber seat gasket. The elastic force from this compression creates the sealing pressure needed to stop leaks.<\/p>\n\n\n\n

For more expanded reading for types of centerline butterfly valve:
[The Difference Between Centerline, Double and Triple Eccentric Butterfly Valves<\/strong><\/a>]<\/p>\n\n\n\n

Key Components<\/strong><\/h2>\n\n\n\n

Center line systems include several working parts:<\/p>\n\n\n\n

    \n
  • Valve body<\/strong>: Cast as one piece, it houses all internal components<\/li>\n\n\n\n
  • Disc (butterfly plate)<\/strong>: The rotating element that controls flow, designed with a streamlined disc shape<\/li>\n\n\n\n
  • Valve stem<\/strong>: Connects the actuator to the disc and provides the rotation axis<\/li>\n\n\n\n
  • Seat seal<\/strong>: A rubber gasket embedded in the valve body that creates the seal<\/li>\n\n\n\n
  • Shaft sleeve<\/strong>: Supports the stem and reduces friction<\/li>\n\n\n\n
  • Actuator<\/strong>: Can be a manual handle, gear operator, electric actuator, or pneumatic device<\/li>\n<\/ul>\n\n\n\n

    The disc design includes two smooth planes near the stem that contact the rubber seat. The outer edge features a spherical shape with specific surface roughness to ensure proper sealing.<\/p>\n\n\n\n