Ball valves consist of a spherical obturator with a cylindrical hole, usually of the same diameter as the pipe, although it can be smaller. Operation is by rotation (1/4 turn) of a shaft mounted, often horizontally, with its axis at right angles to the cylindrical hole. Seals are usually resilient and can provide drop tight shut off. Ball valves are commonly used in small diameters (up to DN 300) . Ball valves are manufactured in one-piece, top entry, two-piece and three-piece bodies. A top entry body allows access to the ball and seats for maintenance without the need to remove the valve and is preferred for larger sizes.

  The ball valve is an inexpensive alternative to other valves. Ball valves use a metal ball with a hole bored through the center, sandwiched between two seats to control flow. Used in many hydrocarbon process applications, ball valves are capable of throttling gases and vapors and are especially useful for low-flow situations. These valves are quick opening and provide a very tight closure on hard-to-hold fluids.

    Ball valves do not use a handwheel but instead use a wrench to control the flow. A 90° turn of the wrench opens or closes the valve. This simple design yields a nonsticking operation that produces minimal pressure drop when the valve is in its full-open position. 

    Ball valves are shutoff valves that use a ball to stop or start the flow of fluid downstream of the valve. The ball, performs the same function as the disc in other valves. As the valve handle is turned to open the valve, the ball rotates to a point where part or the entire hole that is machined through the ball is in line with the valve body inlet and outlet. This allows fluid flow to pass through the valve. When the ball is rotated so that the hole is perpendicular to the flow path, the flow stops.

  For more information please contact with Wenzhou Ruixin Valve Co.,Ltd ,www.ruixinvalve.com