NORTECH is one of the leading China Globe Valve Manufacturer & Supplier.

What are the advantages and disadvantages of the globe valve?
The opening and closing parts of the shut-off valve are plug-shaped broad petals, and the sealing surface is flat or conical, and it moves linearly along the center line of the fluid. The movement form of the rod has a lifting rod type (the valve stem is raised and lowered, the hand wheel does not rise), and there is a lifting rotating rod type (the hand wheel and the valve stem rotate and rise together, and the nut is set on the valve body). The stop valve is only suitable for fully open and fully closed, adjustment and throttling are not allowed.
The stop valve is a forced sealing valve, so when the valve is closed, pressure must be applied to the flap to force the sealing surface to not leak. When the medium enters the valve six from below the valve disc, the resistance that the operating force needs to overcome is the friction force of the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve The diameter of the rod should be large, otherwise the valve stem jacking pipe will fail. In recent years, since the emergence of self-sealing valves, the medium flow direction of the shut-off valve has changed from above the valve clack into the valve cavity. At this time, under the action of the medium pressure, the force of closing the valve is small, while the force of opening the valve is large. The diameter can be reduced accordingly. At the same time, under the action of the medium, this type of valve is also tighter. my country’s valve “Sanhua” once stipulated that the flow direction of the stop valve should be from top to bottom.
When the shut-off valve is opened, when the opening height of the disc is 25%-30% of the nominal diameter, the flow has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the shut-off valve should be determined by the stroke of the valve disc.
The stop valve can be divided into: stop valve, upper thread stem stop valve, lower thread stem stop valve, straight-through stop valve, angle stop valve, three-way stop valve, direct current stop valve, plunger stop valve, needle Shaped globe valve.
Advantages: simple structure, convenient manufacturing and maintenance.
The working stroke is small, and the opening and closing time is short.
Good sealing performance, small friction between the sealing surfaces, and long life.
Disadvantages:
The fluid resistance is large, and the force required for opening and closing is large.
It is not suitable for media with particles, high viscosity and easy to coke.
Poor adjustment performance
Precautions for installation and maintenance: The stop valve operated by the hand wheel and handle can be installed at any position of the pipeline.
Handwheels, handles and dynamic mechanisms are not allowed to be used for lifting. The flow direction of the medium should be consistent with the direction of the arrow shown on the valve body.