Author:Site Editor Publish Time: 2018-11-11 Origin:Site
Floating ball valves are used primarily in the pipeline to cut, distribute and change the direction of flow of the medium. Floating ball valve is a new type of valve widely used in recent years. It has the following advantages: its fluid resistance is small, its resistance coefficient is equal to that of the same length of pipe section; it is small in size, light in weight, compact and reliable, easy to operate, and quick to open and close.
Floating ball valve is fully open to full off as long as 90° rotation, easy to control over long distances, easy to maintain; pneumatic ball valve is simple in structure, the sealing ring is generally active, easy to disassemble and replace; in full or full closed, the ball and seat The sealing surface is isolated from the medium and does not cause erosion of the sealing surface of the valve when the medium passes.
The floating ball valve has a reliable seat seal, complete fire protection structure design, reliable sealing of the valve stem, natural anti-static structure, anti-misoperation structure design, and bracket platform for mounting the drive unit.
The floating ball valve is designed with an elastic sealing ring structure. When the medium pressure is small, the sealing ring in the floating ball valve has a small contact area with the ball, and a large sealing specific pressure is formed at the contact between the sealing ring and the ball to ensure a reliable sealing. When the medium pressure is large, the contact area of the sealing ring and the sphere increases with the elastic deformation of the floating ball valve sealing ring, so the sealing ring can withstand a large medium thrust without being damaged.
When a fire occurs at the site of use of a floating ball valve, when a seat seal, a valve stem seal, a stem seal packing, and a middle flange gasket made of a non-metallic material such as polytetrafluoroethylene are decomposed or destroyed at a high temperature The ultra-ball valve can effectively control the internal leakage and leakage of the valve by means of a specially designed metal-to-metal auxiliary sealing structure.
The valve stem of the floating ball valve adopts a blowout prevention structure to ensure that the valve stem will not be blown out by the medium even in extreme cases such as abnormal pressure rise of the valve cavity and failure of the packing platen. The industrial valve stem adopts a bottom-mounted structural design with a seal. The sealing force of the inverted seal increases with the increase of the medium pressure, so that the valve stem can be reliably sealed under various pressures.