Ball valve is a quarter-turn valves to control the flow of gas or liquid through the hollow pivot ball. They are reliable, durable, provide a good seal, can be used for a variety of media, and has long service life. The difference in the ball bearing design, design, material used will ensure that it is correctly specified. Ball valves are normally used for water pipe, low fluid discharge point, high vent for gas, steam, or gas processing applications. Ball valve is a quarter-turn valves can control the flow of gas or liquid through the hollow ball rolled, such as 1. They often because of its reliable, durable, good seal, a wide range of media options, and long service life, even if occasionally use. This article will discuss the working principle of the Industrial Valves design options, and specify a typical applications, the valve is common and good practice. Principle 1: the cross section of the double ball valve stem O - manual operation The ball valve seat ring shell handle ( Is shown in the 2) Most of the ball valve handle for manual operation. When the user turns a handle 90 degrees, the valve stem ( 1) And the ball ( 4) 。 Ball has described by its hole, as shown in 1, the move allowed to flow through the valve handle is parallel to the pipe or hose connection. When rotated 90 degrees, the hollow section and vertical flow, to prevent the gas or liquid through the valve. In the seat, 5) Allow appropriate spin around the seal to prevent media from around the ball. O-ring ( 2) And rotation allows proper sealing of the valve stem. According to the different shell (of the type of media, 3) Ball bearings, ( 4) And seat ( 5) Materials are available to ensure that no corrosion. Floating condition and pivot ball ball valve design option 1 and 2 shows one of the most common ball valve design, & other; The design of floating ball. In this design, depends on the direction of the pressure, the pressure on a seat, and to provide a seal and support. When the pressure in the opposite direction from the direction, the ball is in another direction and another seat. However, if the application needs to be described operation of large diameter and high pressure ( For example 30 and DN> 100mm） , & other; Trunnion & throughout; Is to design a better fit. The design highlights shaft mechanically small at the bottom and top of the ball bearing in the valve housing. This allows a more solid design, need higher pressure and ball valves. Bore ball valve design above through the ball can be designed into different shapes: reduce the size of the hole: described the size of the hole slightly less than pipe, introduces important friction loss ( Or pressure) In the system. However, they are the cheapest one of the most common type. Full size: inner diameter is precisely the same pipe size, do not produce friction loss. This is required for the free flow of application, when clean ( Pigging) Is required. V: the hole is small V ( The upstream end) And this allows more precise control of flow rate. This allows the linear flow characteristic, but need more durable design, due to the high velocity and wear. Material selection, ball valve shell, seat o-ring and, based on application requirements can be specified in different materials. According to the medium temperature, pressure, and the media for chemical resistance, can choose different material. Know your media properties to specify the appropriate valve, to ensure the sealing and no corrosion of the valve, in order to ensure proper performance and service life. Typical application manual ball valve used in wide range of applications. As long as the application does not need frequent adjustment, has a low flow rate, in order to prevent water hammer, non pollution medium ( Unless you have 2 or 3 - ) Ball valve is used to clean is usually a good choice. You will find them in the water piping, low pressure fluid discharge points, high vent for gas, steam, or gas processing applications.
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