The globe valve opening and closing is plug valve, sealing work like a plane or a cone, the disc along the centerline of fluid movement as a straight line. American standard check valve according to the conditions of use, valve can be all-metal structure, can also be embedded in disc shelves rubber mat or rubber ring form. Pneumatic valve disc sliding along the center line of the body of the Industrial Valves. Pipeline check valve is a new kind of valve, its small size, light in weight and good processing technology, is one of the check valve development direction. But the fluid drag coefficient is slightly superior to swing check valves. Swing check valve can also be used to give the pressure could rise to more than the system pressure of the secondary system supply piping. Stem form of sport development is lifting lever ( rod and hand wheel lifting) And through the rotating lever lifting system ( With the valve stem handwheel using rotary can lift, nut institution is located in the control of the body) 。 Globe valve is only applicable to full open and close, not allowed to adjust and throttling. Globe valves are mandatory sealed valve, so when the Industrial Valves is closed, must be pressure on the disc, forced sealing surface does not leak. 。 Medium from entering the valve at the bottom of the disc, the operating force of resistance is the stem and packing friction and medium pressure to produce thrust. 。 Close the valve is greater than the force to open the valve, so the Industrial Valves stem diameter is larger, otherwise the stem at the top of the bending failure happens. 。 In recent years, the self-styled valve, cut-off valve flow above the disc into the valve chamber. 。 At the same time, under the action of medium, this type of valve is also more closely. Third, we need to have rules in China valve, cut-off valve flow, shall be applied. 。 When the valve is opened, height of valve, nominal diameter 25% to 30%, maximum flow when the valve has reached the fully open position. Therefore, valve seated position, disc stroke should be to determine. Globe valve has the following advantages: 1, the structure is simple, can manufacture and maintenance more convenient. 2. Working stroke is small, open and close time is short. 。 3, sealing, and sealing surface friction small, live longer. Globe valve faults are as follows: 1, the fluid flow resistance is big, required when opening and closing force is larger. 2. Do not apply to the particles, the viscosity, easy to coking of the medium. 。 3, poor regulation performance. As shown in figure 4, the valve stem threads according to the position of the male, and female separate type. By dielectric, cut-through, DC and the Angle of flow distribution. Part of the cut-off valve, the form of the seal packing seal bellows sealed valve and shut-off valve. The main characteristics of development of ball valve is the enterprise itself design of economic structure is compact, reliable sealing system, simple structure, convenient maintenance management, the sealing surface and the spherical often in the closed state, not easily be medium erosion, easy operation and maintenance, suitable for water, solvents, acids and general social work environment media such as natural gas, but also is suitable for the research of bad living conditions affect medium, such as oxygen, hydrogen peroxide, methane and ethylene, can get more extensive application in various fields. Ball valve body can be the student body, also can be combined. Ball valve has the following advantages: 1. Fluid resistance small, full bore ball valve flow resistance. 。 2. Simple structure, small volume, light weight. The compact and reliable. It has two sealing surface, and the ball valve sealing surface material in our country at present and conduct extensive research to use all kinds of plastic, good sealing, can realize enterprise completely sealed. Also has been widely used in vacuum management system used. 4. Convenient operation, opening and closing rapidly, from open to close just rotate it 90, ease of remote control. 。 Convenient maintenance, simple ball valve, seals are generally activities, remove the replacement is more convenient.
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