Why should the globe valve be designed as a low inlet, high outlet and small diameter globe valve? In the design and installation process, low inlet and high outlet are usually used, that is, the globe valve flows from below the valve flap to above the valve flap. The small-diameter globe valve has very small stem torque and small opening and closing operating torque. Even under the influence of working pressure, the impact on the operation is small, because the influence of the flow direction of the medium on the difficulty of operation can be ignored. The small-diameter globe valve is adopted They are all non-balanced structures. Why should the globe valve be designed with low inlet and high outlet with low inlet and high outlet? When it is closed, the medium pressure has a small impact on the valve stem and will not affect the valve stem.
The valve stem is also immersed in the medium, which is not easy to be corroded by the medium, which effectively protects the valve stem; the packing structure is also effectively isolated from the medium, ensuring the influence of the medium on the packing, and effectively extending the life of the valve stem packing.
The most important thing is safety. If the valve stem breaks or other failures occur, the valve can automatically open to prevent system overpressure.
The use of low inlet and high outlet can also effectively avoid the water hammer phenomenon of the shut-off valve. When closed, under the action of the medium pressure, the moving speed under the lubricating flap cannot be fast, and the closing time is relatively long, and it is not easy to cause water hammer at will Phenomenon, causing pipeline vibration and avoiding damage to the entire pipeline related equipment.