Ball valves are mainly used to cut off or connected media can also be used for fluid regulation and control, V-type ball valve can be more precise flow regulation and control, while the three-way ball valve is used for the distribution media and change the flow of media. What are the main types of ball valves that do? The following is a brief introduction of several commonly used:
First, the ball valve form of the structure can be divided into:
1)Floating ball valve.
The ball valve is floating under the media pressure, the ball can produce a certain displacement and pressed on the sealing surface of the outlet end, ensure the outlet end seal.
Floating ball valve simple structure, good sealing, but the ball all bear the load of the working medium to pass the exit ring, so to consider the ring material can withstand the work load media sphere. This structure is widely used in the low-pressure valve.
2)Fixed ball valve or trunnion mounted ball valve.
The ball valve is fixed, no pressure produces no movement. Fixed ball valve comes with a floating valve seat, by medium pressure, the valve seat to move, so that seals pressed onto the ball, in order to ensure the seal. Usually with the ball, the lower shaft with bearings, operating torque, suitable for high pressure and large diameter valves.
To reduce the trunniuon ball valve torque value and can increase the degree of sealing, ball valve seals has emerged in recent years, both the pressure injection of a special lubricant between the sealing surface to form a layer of film that enhances the seal, and reduces operator torque, more suitable for large-diameter high-pressure valve.
3)Elastic ball valve.
The ball valve is elastic. Ball and valve seat rings are metal materials, sealing pressure than the large, rely on the media itself has reached less than the pressure seal of requirements to be imposed force. This ball valve is suitable for high temperature and high pressure medium.
Elastic sphere is the sphere in the lower end of the inner wall to open a resilient groove, and get flexible. When closing the channel, with the stem of the wedge-shaped head with the ball to open up the seat pressing to seal. Before turning the ball first release wedge-shaped head, the ball along with restoration of the original prototype, so that small gap, sealing surface can reduce friction and operating torque between the ball and valve seat.
Second, the ball valve according to the driving mode can be divided into:
1)The electric ball valve: With electric drive ball valve.
2)Pneumatic ball valve: With compressed air ball valves.
3)Hydraulic ball valve: With oil fluid pressure actuated ball valve.
In addition there are more than a combination of several driving modes, such as gas – electric ball valves.
4)Manual ball valve: With the manual ball valve hand wheels, handles to manipulate the ball valve action. When the ball valve opening and closing torque is large, it can be set between the hand wheel worm reducer and stem. If necessary, you can also use the direction of the joint and the drive shaft for remote operation.
Third, the ball valve can be divided according to the connection method:
1) Threaded ball valve: Ball valve with internal or external thread and pipe thread connections.
2) Flanged ball valve: Ball valve with flange and pipe flange.
3)Solder connection Ball Valve: Ball valve with welding and pipe welding groove connection.
4)Wafer ball valves: bolt directly to the ball and clipped together through two pipelines form of connection.
Fourth, the ball valve can be divided according to body material:
1)The metal material ball valve: other parts of its body is made of a metallic material. Such as cast iron ball valve, carbon steel ball valve, steel ball valve, copper alloy ball valve, aluminum ball valve, titanium ball ball, Monel ball valve.
2)Non-metallic materials ball valve: their body and other parts are made of non-metallic materials. Such as plastic ball valve.
3)Metal body lined Ball valve: body shape for the main surface of the metal, interior where contact with the media are lining, such as rubber lined ball valve, lined ball valve.
Fifth, the ball valve can be divided according to their channel position:
Straight ball valve, ball valve (L-type ball valve, T-type ball valve and Y-type three-way ball valve), the four-way ball valve and right angle ball valve. After three valve for dispensing the media and change the flow of media.
Sixth, the ball valve can be divided according to their channel types: full bore ball valve, constriction ball valve, double necking ball valve.
Seven, ball valve can be divided according to the other: a monolithic ball valve, 2-pc ball valve, 3-pc ball valve, side-mounted ball valve, top entry ball valve.
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