The principle of the structure of butterfly valve is particularly suitable for the production of large diameter valves. Butterfly not only in oil, gas, chemical, general industrial water treatment is widely used, but also applies to thermal power plant cooling water systems.
Butterfly valves are commonly used for clip-on butterfly valve and two Flanged butterfly valve. Clip-on butterfly is double-headed bolts to connect the valve between the two pipe flange, flange type butterfly valve is a valve on the flange, the bolts on both ends of the valve in the pipe flange connection method Lan on.
Ball
Ball is evolved by the stopcock. It has the same 90-degree rotation to action, unlike the faucet body is a sphere, a circular through-hole or channel through its axis. Spherical and the proportion of openings should be such that when the ball 90-degree rotation, in imports and exports should all show spherical, thus cutting off the flow.
Ball only about 90 degrees rotation of the rotating operation and a small torque can be closed tightly. Full equality for the medium of the body cavity to provide a little resistance, through the flow channel. Ball valve is generally believed that the most appropriate use of direct opening and closing, the recent development has been designed as a ball valve so that it flows with the expenditure and control purposes. Ball is in itself the main features of compact structure, easy operation and maintenance, applicable to water, solvents, acid and gas, such as working media in general, but also applicable to the work of the medium conditions, such as oxygen, hydrogen peroxide, methane and ethylene and so on. Ball Valve can be a whole can also be modular.
Selected by the valve to prevent the media back
This type of valve is to allow only one direction to the flow of media, but also to prevent the flow direction. This valve is usually the work automatically, in a direction of flow of fluid under pressure, open the valve; fluid flowing in the opposite direction, fluid pressure and the valve from the valve since the role of coincidence in the valve seat, thereby cutting off the flow. Non-return valve which belongs to this type of valve, which includes Swing Check Valve Check Valve and the take-off and landing. Swing Check Valve bodies are ordinary hinge, there is a door the same as the free flap valve against the valve seat sloping surface. In order to ensure that every valve seat surface to reach the appropriate position in the valve hinge design in order to have a valve Swing have sufficient space and the real valve, all-round contact with the valve seat. Valve could be made of metal can also be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements. Swing Check Valve fully opened in the circumstances, almost unimpeded fluid pressure, so the pressure drop through the valve is relatively small. Take-off and landing flap-type check valve is located at the valve seat sealing surface of the body. In addition to this valve valve is free to take-off and landing, the other part as the same cut-off valve, fluid pressure valve lift from the valve seat sealing surface, leading to medium return valve to the valve seat down, and cut off the flow. Under the conditions of use, valve can be all-metal structure can also be rack mounted in the valve rubber mat or rubber ring form. The same as the cut-off valve, fluid movements through the channel-type check valve is narrow, and therefore through the movements of the pressure drop Check Valve Swing Check Valve than larger, and Swing Check Valve flow restrictions rarely.
Parameters selected by the media regulator valve
In the production process, in order for the pressure medium, the flow in line with the process parameters such as the requirements of regulating agencies need to regulate the above-mentioned parameters. Regulation of the main working principle of agency, by changing the valve with the valve flap valve and the flow area between valve seat to achieve the purpose of adjusting the above parameters. Such valves are collectively referred to as control valves, which rely on the media into the drive itself is called self-drive-style control valves, such as relief valve, regulator valve and so on, leading up any power-driven (such as electricity, compressed air and fluid dynamics), he referred to as drive control valve, control valve, such as electric, pneumatic and hydraulic control valve, such as regulating valve.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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