Welded globe valve
Working principle
We assume that there is a pipe with a cover. Water flows in from the bottom of the pipe and flows out toward the pipe mouth. The cover of the outlet pipe is equivalent to the closing member of the globe valve. If you lift the pipe cover upward by hand, the water will flow out. Covering the pipe will stop the flow of water, which is equivalent to the working principle of a globe valve. The globe valve rotates the handwheel to raise and lower the valve stem, driving the valve disc to move linearly parallel to the flow direction of the medium to achieve the purpose of opening and closing. The handwheel rotates clockwise, and the working medium enters through the channel below the valve disc. At this time, the applied sealing force must be equal to or greater than the sum of the necessary specific pressure generated on the sealing surface and the upward force of the medium. When the globe valve is opened, when the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc.
Note:
1. The globe valve only allows the medium to flow in one direction, and there is a direction during installation.
2. The function of the globe valve is either 0 or 1, either passing or blocking. In other words, the globe valve is only suitable for fully open and fully closed, and adjustment and throttling are not recommended.
Our advantages
Overview
The opening and closing part of the globe valve is a plug-shaped valve disc, with a flat or sea cone surface on the sealing surface. The valve disc moves linearly along the center line of the valve seat. Since the change of the valve seat opening is proportional to the stroke of the valve disc, It is very suitable for regulating flow.
Principle
The valve plays an important role in cutting off and throttling the medium in the pipeline in which it is located. As an extremely important cut-off valve, the stop valve is sealed by applying torque to the valve stem, which moves in the axial direction. The valve disc exerts pressure to make the valve disc sealing surface and the valve seat sealing surface closely fit, preventing the medium from leaking along the gap between the sealing surfaces.
Media
Using different materials, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc.
Appllication fields
Widely used in power plants, nuclear power, petroleum, chemical industry, natural gas, municipal administration, metallurgy, construction, sewage discharge, environmental protection, energy saving and other industries.
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