3-Piece Flanged Ball Valves

Three-piece flange ball valve consists of a left valve body, a right valve cover and an intermediate valve body. It is connected to the pipeline through a flange, and the ball rotates 90° around the valve stem to open and close the medium or switch the flow direction.

Its core structural features include:

‌Modular design‌: The three-piece structure can be disassembled for maintenance, which is convenient for replacing the sealing ring or ball;
‌Flange connection‌: It is suitable for standard flanges such as GB and ANSI, with a diameter range of DN10-DN100 (1/2"-4");
‌Material diversity‌: The valve body can be selected from cast steel (WCB), stainless steel (304/316), etc., and the sealing surface is made of PTFE or hard alloy.

Selection points:

Media matching: For medium containing particles, hard seals or V-shaped balls should be selected, and PTFE soft seals are suitable for clean fluids;
Flange standard: Confirm that the flange specifications (such as HG/T20592, ASME B16.5) match the pipeline;
Drive mode: For high-frequency operation, it is recommended to use a pneumatic actuator (AC220V/380V) or an explosion-proof electric device.

Installation and maintenance guide
Installation specifications: Ensure that the flange bolts are tightened symmetrically to avoid leakage caused by uneven force on the valve body; Reserve space for valve stem rotation (≥90°) to avoid interference in operation.
Maintenance recommendations: Regularly check the wear of the sealing surface, replace the soft seal every 2 years, and repair or replace the hard seal if the wear is greater than 1mm; When the valve cavity is not used for a long time, the medium must be emptied to prevent the ball from sticking to the valve seat.

 

3-Piece Flanged Ball Valves

 

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