Globe valve principle globe valve structure globe valve characteristic shut-off valve application shut-off valve construction
The opening and closing member of the shut-off valve is a plug-shaped valve flap, the sealing surface is flat or tapered, and the valve flap moves linearly along the center line of the fluid. The movement form of the valve stem has a lifting rod type (the valve stem is lifted and lowered, the hand wheel does not move up and down), and there is also a lifting rotary rod type (the hand wheel and the valve stem rotate together and the nut is set on the valve body). The shut-off valve is only suitable for full opening and full closing, and adjustment and throttling are not allowed. The shut-off valve is a forced-sealed valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface to leak. When the medium enters the valve from below the valve flap, the resistance to be overcome by the operating force is the friction between the stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve, so the valve stem The diameter of the stem should be large, otherwise the valve stem can be bent. In recent years, after the appearance of the self-sealing valve, the medium flow direction of the shut-off valve is changed into the valve chamber from above the valve flap. At this time, under the action of the medium pressure, the force of closing the valve is small, and the force of opening the valve is large, the valve stem is The diameter can be reduced accordingly. At the same time, this type of valve is also tight under the action of the medium. Classification of the stop valve : 1. According to the channel direction of the stop valve, it is divided into: 1 ) straight-through stop valve. 2 ) DC type cut-off valve: In the direct current or Y -shaped stop valve, the flow path of the valve body is inclined with the main flow path, so that the degree of damage of the flow state is smaller than that of the conventional stop valve, and thus the pressure loss through the valve is correspondingly Small. 3 ) Angle stop valve: In the angle cut-off valve, the fluid only needs to change in one direction, so that the pressure drop through the valve is smaller than that of the conventional structure. 4 ) Plunger shut-off valve: This type of shut-off valve is a variant of a conventional shut-off valve. 5) The shut-off valve is divided according to the sealing form, and has a packing sealing shut-off valve and a bellows sealing shut-off valve. In this valve, the flap and seat are usually designed based on the principle of the plunger. The valve flap is polished into a plunger that is coupled to the valve stem, and the seal is achieved by two elastomeric sealing rings that are placed over the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is pressed by the load exerted by the bonnet nut on the bonnet. The elastomeric seal can be replaced and can be made from a wide variety of materials. The valve is mainly used for "opening" or "off", but with a special form of plunger or special collar, it can also be used to regulate flow. . The stop valve has the following advantages: 1. Simple structure, convenient manufacturing and maintenance. 2 , the work schedule is small, the opening and closing time is short. 3 , good sealing, small friction between sealing surfaces, long life. The disadvantages of the shut-off valve are as follows: 1. The fluid resistance is large, and the force required for opening and closing is large. 2 , does not apply to media with particles, high viscosity, easy to coke. 3 , the adjustment performance is poor. The following items should be noted for the installation and maintenance of the shut-off valve: 1. The shut-off valve operated by the handwheel and the handle can be installed at any position of the pipeline. 2 , hand wheel, handle and aerodynamic mechanism, is not allowed to lift. 3. The flow direction of the medium should be consistent with the direction of the arrow shown in the valve body.
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