High pressure globe valve introduction

High-pressure globe valve opening and closing pieces are plug-shaped flap, the sealing surface was flat or tapered surface, the valve flap along the centerline of the fluid for linear motion. Stem movement form, lifting rod (stem lift, hand wheel does not lift), there are lifting rotary rod (hand wheel with the stem rotating together, the nut is located in the valve body). Globe valve only applies to fully open and fully closed, does not allow for regulation and throttling. Well-known domestic manufacturers Shanghai Valve Co., Ltd. and the authority of Hunan Xinxing Hydropower Equipment Co., Ltd.. Its company is the Ministry of Machinery Industry, Ministry of Chemical Industry, China National Chemical Equipment Corporation fixed-point management of manufacturing enterprises. Its products in the industry have a certain price advantage and technological advantages. High-pressure stop valve is a forced-sealed valve, so the valve is closed, you must apply pressure to the flap to force the sealing surface does not leak. When the medium from below the valve into the valve, the operating force needed to overcome the resistance is the valve stem and packing friction and the pressure generated by the media thrust, off the valve force than the valve open, so the valve The diameter of the rod should be large, otherwise it will happen to the top of the valve stem failure. In recent years, since the self-sealing valve appears, the cut-off valve of the media flow to change over from the top of the valve into the valve cavity, then under medium pressure, the valve closing force is small, and open the valve force, the valve stem The diameter can be reduced accordingly. At the same time, in the medium, this form of valve is also more stringent. China's valve "three to" have provided that the flow of the valve, all from top to bottom. When the high-pressure stop valve is opened, the valve opening height 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 full-stop position of the valve, valve stroke should be determined. High-pressure globe valve has the following advantages: simple structure, manufacturing and maintenance more convenient. Small work schedule, opening and closing time is short. Good sealing, sealing surface friction, long life. Disadvantages of high-pressure stop valve are as follows: fluid resistance, the required force to open and close larger. Not suitable for particles with a larger viscosity, easy to caking medium. Poor regulation performance. Types of high-pressure globe valve: The type of high-pressure globe valve is divided into external thread type and internal thread type according to the position of the stem thread. By media flow points, there are straight-through, DC and angle. Globe valve by sealing form points, there are packing seal globe valve and bellows seal valve. High-pressure globe valve installation and maintenance should note the following: Handwheel, handle-operated globe valve can be installed in any position on the pipeline. Hand wheel, handle and Wei moving mechanism, do not allow lifting. The flow direction of the medium should be the same as the direction of the arrow shown on the valve body.