1. What is the principle of the globe valve?
The globe valve uses the torsion of the valve stem to give downward pressure to the sealing surface. Relying on the pressure of the valve stem, the sealing surface of the disc and the sealing surface of the valve seat are closely attached to prevent the inflow of the medium or to adjust the flow rate of the medium.
2. What is the scope of application of the globe valve?
1. It is suitable for use as a shut-off valve for heat transfer oil, toxic, flammable, highly permeable, environmentally polluting, and radioactive fluid medium pipelines. It can also be used for adjustment. It is a high-quality product for creating a leak-free factory. The valve castings are all precision casting.
2. The stop valve refers to the valve whose disc moves along the center line of the valve seat. According to this movement form of the valve disc, the valve seat port and the valve disc stroke are proportional to each other. Because the valve stem of this type of valve has a short stroke when opening or closing, and has a very reliable cut-off function, and because the change of the valve seat port is proportional to the stroke of the valve disc, it is very suitable for matching The flow adjustment is used as cut-off or adjustment and throttling, and the same pneumatic ball valve is also applicable.
3. What is the function of the globe valve?
1. The opening and closing parts used by the globe valve are plug-shaped discs, which are divided into flat and conical surfaces on the sealing surface, and the discs move linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem is raised and lowered, and the hand wheel does not rise), and there is also a lifting rotary rod type (the hand wheel and the valve stem rotate and rise together, and the nut is set on the valve body).
2. The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The medium flow direction of the shut-off valve is changed to enter the valve cavity from above the disc. At this time, under the action of the medium pressure, the force to close the valve is small, while the force to open the valve is large. The opening or closing stroke of the valve stem is relatively short. Once the globe valve is in In the open state, there is no more contact between its valve seat and the sealing surface of the disc, so its sealing surface has less mechanical wear and has a very reliable cut-off action. Since most of the valve seats and discs of the globe valves are easier to repair or replace the sealing components, the entire instrument valve does not need to be removed from the pipeline. This is very suitable for the occasions where the instrument valve and the pipeline are welded together.
3. In general, the function of the globe valve is only fully open and fully closed, that is, the cut-off function, but some variants of the shut-off valve, through some structural changes, can also achieve the role of adjustment and throttling.
Post time: Nov-03-2021