Our common globe valves are stainless steel globe valves, forged steel globe valves, cast steel globe valves. The globe valve opening and closing is plug valve, sealing surfaces appear flat or cone, disc make linear movement along the centerline of fluid. Stem form of exercise, lifting lever ( rod and hand wheel lifting) And lift rotating lever ( Hand wheel rotating lifting with the valve stem and nut in the body) 。 Globe valve used throughout close tu, don't allow to adjust and throttling. Cut-off valve belongs to compulsory sealed valve, the valve is closed, must be pressure on the disc, to force a sealing surface does not leak. When the medium from the disc below to the valve, the operating force to overcome resistance, is stem and packing friction with the thrust produced by medium pressure, close the valve force stronger than open the valve, so it's bigger, the diameter of the stem or stem top bending failure happens. In recent years, from the seal valve, cut-off valve is replaced by the disc above the medium flow direction into the Industrial Valves cavity, in the medium pressure at this moment, close the valve of the force is small, and the strength of the valve, the valve stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of valve is tight. in China 'three for' regulation, the flow of cut-off valve, shall be applied. Cut-off valve, also called door and valve is one of the most widely used, it is popular, is due to open and close in the process of friction surface, more durable, opening, manufacturing easy, convenient maintenance, not only suitable for low voltage, and is suitable for high pressure. Globe valve closure principle is, rely on the valve rod pressure, sealing surface and the valve seat valve sealing surface fit closely, prevent medium circulation. One-way flow cut-off valve only medium, the installation direction. The structure of the cut-off valve length is greater than the gate valve, fluid resistance is big, at the same time run for a long time, seal reliability is not strong. Advantage 1, simple structure, manufacture and maintenance more convenient. 2, small work schedule, opening and closing time is short. 3, good sealing, sealing surface friction between the small, long service life. 4, as the structure of the valve body has a straight-through, straight and right Angle type. Straight-through are the most common type of structure, but the maximum resistance of the fluid. Once-through fluid resistance small, usually for containing solids or the viscosity of fluid. Right Angle type body more forged, suitable for small drift diameter, high pressure cut-off valve. Disadvantages 1, the fluid resistance is big, required when opening and closing force is larger. 2, does not apply to take larger particles, viscosity, easy to coking of the medium. 3, poor regulation performance. 4, the kinds of cut-off Industrial Valves according to the position of the stem thread with external thread type, internal thread type. According to the flow of medium, have straight-through type, straight and Angle. Cut-off valve, the form of the seal packing seal globe valve and bellows seal globe valves. 5, bellows seal globe valve adopts the design of the bellows seal, completely eliminates the common valve stem packing seal aging fast easy leakage faults, not only improve the efficiency of the use of energy, increase production equipment safety, maintenance cost was decreased, and the frequent maintenance, also provides a clean and safe work environment. Installation and maintenance of 1, hand wheel, lever operation stop valve can be installed in any position. 2, hand wheel, lever and wei mechanism, does not allow for lifting. 3, the flow of medium should be consistent with the direction arrow shown in the body. 4 sealed valve, cut-off valve belong to mandatory, so the valve is closed, must be pressure on the disc, to force a sealing surface does not leak. When medium by disc below into the valve 6, the operating force needed to overcome the resistance, is stem and packing of the friction force and the thrust produced by medium pressure, close the valve strength is stronger than open the valve, so it's bigger, the diameter of the stem or stem top bending failure happens. In recent years, from the seal valve, cut-off valve is replaced by the disc above the medium flow direction into the valve cavity, in the medium pressure at this moment, close the valve of the force is small, and the strength of the Industrial Valves, the valve stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of valve is tight. in China 'three for' regulation, the flow of cut-off valve, shall be applied. 5, cut-off valve has simple structure, can through the valve stem rotation and the principle of elevator, the valve open or truncation, and ensure that the valve seal and seal function. Due to the special structure of movement principle, and also causes stress between the valve seal is extremely adverse consequences ( Form both the sealing pair must be vertical pressure, and the relative slip between vice friction sealing) 。 Practice has proved that the valve on the seal tend to open/close a few times, just because the sealing pair of scratches and cause leakage. Serious to scratch scratch slightly open repair, are scrapped due to damage, so the consequences of not only increases the manufacturing cost, and the impact on the performance of the valve. To solve these problems to the valve seal structure and materials tested and improved.
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