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Technology | Types Of Valve Characteristics And Selection

 Gost globe valve manufacturers introduces you: Globe valve opening and closing parts are plug-shaped discs, the sealing surface is flat or conical, and the discs move linearly along the centerline of the fluid. There are lifting rod types for valve stem movement (the valve rod is raised and lowered, and the hand wheel does not rise and fall), and there are also lifting and rotating lever types (the hand wheel and the valve stem are rotated and raised together, and the nut is provided on the valve body). gost globe valve china is only applicable to fully open and fully closed, and does not allow adjustment and throttling.
1.Needle globe valve
It is used for precise flow control. The valve disc is usually integrated into the valve stem, and it has a needle makeup head that cooperates with the valve seat with high accuracy. In addition, the thread pitch of the needle-type globe valve stem thread is smaller than that of the ordinary ordinary valve. Under normal circumstances, the size of the needle seat valve seat hole is smaller than the size of the pipe. Therefore, it is usually limited to pipelines with small nominal diameters, and more commonly used for sampling valves.
2.DC-type globe valve
The stem and channel of the DC-type globe valve form a certain angle, and the sealing surface of the valve seat and the inlet and outlet passage also have a certain angle. The valve body can be made integral or separated. The valve body separate cut-off valve uses two valve bodies to sandwich the valve seat in the middle for easy maintenance. This type of stop valve allows the fluid to hardly change the flow direction, and the flow resistance is minimized in the stop valve. The valve seat and valve disc sealing surface can be welded with hard alloy to make the entire valve more resistant to erosion and corrosion, which is very suitable for pipeline control in the alumina production process, and also suitable for pipelines with coke and solid particles.
3.Angle globe valve
The biggest advantage of the angle globe valve is that the valve can be installed at the corner of the piping system, which saves 90 ° elbows and is easy to operate. Therefore, this type of valve is most suitable for use in synthetic ammonia production systems and refrigeration systems in fertilizer plants. Such as J44H-160, J44H-320, L44H-160, L44H-320 are completely designed for synthetic ammonia production systems.
4.Steel ball or porcelain ball sealed globe valve
The structure of the valve is that the valve body is divided into conjoined type and split type. The valve disc is made of STL hard alloy steel balls or amorphous materials, which are powder-formed, high-temperature sintered, and refined ceramic balls. The rolled envelope ball at the lower end of the valve stem is in the valve stem ball hole. When the ball is rotated three-dimensionally in the valve hole, it can generate countless seal lines, which greatly increases the service life of the sealing surface and can also ensure a reliable seal.
Due to the limitation of the ball seal, this valve is generally used for smaller nominal passages, about 6-25mm. The valve is suitable for high-temperature and high-pressure steam pipelines in nuclear power plants and thermal power plants, instrumentation pipelines for sampling and sewage systems, and temperature, pressure, abrasion, and corrosion-resistant pipelines in petrochemical and chemical systems.

Gost Globe Valve China

Gost Globe Valve China

 

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