Stainless steel applications are many and miscellaneous, which can be described in various fields. This article is concerned with the application of one of the stainless steel ball valve. The principle is to use the rotary valve to make the valve unblocked or blocked. Stainless steel ball valve switch light, small size, can be made large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and spherical often in the closed state, can prevent the medium erosion, the field of application is wide.
Stainless steel ball valves and plug valves belong to the same type of valve, but its closure is a sphere that rotates around the center of the valve to open and close a valve. Stainless steel ball valve in the pipeline’s main role is to cut off, distribution and change the direction of media flow.
Stainless steel ball valve has many advantages, first of all, its resistance to fluid is small, the resistance coefficient is the same length as the pipe section. Second, the equipment is simple in structure, small in size and light in weight. In addition, stainless steel ball valve is closely and reliably. At present, the sealing surface of ball valve is widely used in plastics, and has good tightness. It is also widely used in vacuum system. The operation is convenient, open and close rapidly, from fully open to fully closed as long as 90 degrees rotation of the remote control is very convenient. And maintenance is convenient, because the ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are very good operation. In full or full closed, the ball and valve seat sealing surface and dielectric isolation, the media through, it will not cause the sealing surface of the valve erosion. Therefore, the scope of the application of stainless steel ball valve, diameter from a few millimeters to a few meters, from high vacuum, high pressure can be applied. Now, stainless steel ball valves have been widely used in petroleum, atomic, chemical, paper making, aviation, power generation, rockets and daily life.
Stainless steel ball valve features three main points, first of all, three way ball valve, in the structure of the integrated structure, four seat seal type, flange connection less, high reliability, very lightweight. The three ball core type T and type L, long service life, large flow capacity, small resistance and. In addition, the stainless steel ball valve is divided into two types: action type, single function type and double function type. The single acting type is characterized by that when the power source fails, the ball valve will be in the required state of the control system. The ball valve can be divided into straight through type according to its channel position, the three and right angles. The latter two ball valves are used to distribute the medium and change the flow direction of the medium.
Stainless steel ball valve can be divided into three kinds according to the structure.
Floating ball stainless steel ball valve
Ball valve is floating, in the media under the action of pressure, the stainless steel sphere can form a certain displacement, and tight at the outlet end of the sealing surface, so as to ensure that the export end seal. Floating ball valve structure is simple, good sealing, but the ball to withstand the load medium all passed to the export sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This stainless steel ball valve structure is more used in medium and low pressure ball valve.
Fixed ball stainless steel ball valve
The ball of this kind of stainless steel ball valve is fixed and will not be moved by the pressure of the medium. Fixed ball valve also has a floating seat, pressure by the media, the valve seat to move, so that the sealing ring tightly pressed on the sphere, to ensure that the seal. General with the ball in the upper and lower shaft with bearings, operating torque, suitable for use in high pressure and large diameter valves. In order to reduce the valve operating torque and increase the reliability of the seal, valve seal has emerged in recent years, both the pressure injection of a special lubricant in the sealing surface, to form a layer of film that enhances the sealing, and reduce operating torque, more suitable for large-diameter high-pressure valve.
Elastic ball stainless steel ball valve
The ball body of the stainless steel ball valve has elasticity. Ball and seat seals are made of metal materials, sealing than pressure, rely on the pressure of the media itself and flat to meet the requirements of sealing, so be sure to exert external force. This valve is suitable for high temperature and high pressure medium. An elastic sphere is obtained by opening an elastic slot at the lower end of the inner wall of a sphere. When the channel closes, the ball is opened with the wedge head of the valve stem and pressed against the valve seat to form a seal.
Source: China Ball Valve Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)