Stop Industrial Valves is closed ( The disc) Along the valve seat centerline mobile. Due to cut off the function of this valve very reliable, and due to the change of his seat and disc stroke proportional relations, is very suitable for the flow regulation, therefore, cut-off valve is very fit for cutting and adjust and throttling. Globe valves use is widespread, but due to the opening and closing torque is larger, the structure length is longer, the nominal diameter usually under 250 mm, pay special attention to when choose direction of imports and exports, in 150 mm below the cut-off valve, mostly from the lower part of the disc into the medium, and 200 mm and above cut-off valve, mostly from the top of the disc into the, is considering the closing of the valve torque caused by, in order to reduce the open-close torque, generally more than 200 mm of the cut-off valve is set outside bypass or bypass valve. Globe valves according to structure form, generally divided into straight-through type globe valve, Angle stop valve, stop valve, tee once-through cut-off valve, needle valve; According to the seal can be divided into soft seal globe valves and metal seal globe valve; According to the pressure into low pressure cut-off valve, medium pressure cut-off valve, high pressure cut-off valve, vacuum valve; According to the temperature can be divided into high temperature cut-off valve, cut-off valve in temperature, low temperature cut-off Industrial Valves and so on. According to the model selection of the medium temperature, pressure, diameter, medium characteristics for the correct selection. Straight-through cut-off valve, the pressure of it relies on the valve stem, sealing surface and the valve seat valve sealing surface together, prevent medium circulation. The friction between the sealing surface in the process of opening and closing, wear-resisting, small opening, good manufacturing process performance. It is the most widely used in the industrial sector of a valve. Angle type 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) 。 Line pipe cut-off valve is only applicable to all seated, tu do not allow to adjust and throttling. Three-way valve belongs to compulsory sealed valve, the valve is closed, must be pressure on the disc, to force a sealing surface does not leak; Three-way valve can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium such as various types of fluid flow. Three-way valve according to the material also can be divided into cast steel, stainless steel, chrome molybdenum steel and other materials. In once-through or y-shaped cut-off valve, the valve port from the mainstream way into a diagonal lines, so that the flow state damage than conventional cut-off valve, and pressure loss across the valve and the corresponding small. 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 Industrial Valves. Type needle valve features include simple structure, easy maintenance, low manufacturing cost, etc. , but the throttle valve adjustment accuracy is not high, difficult to use as regulating valve, at the same time due to the medium between disc and seat in the valve flow velocity is higher, it's easy to have a cavitation phenomenon, so parts need to use of cavitation resistant material, and not suitable for cutting medium. Type needle valve generally applicable to the occasion of load change is not big, or to speed stability requirement is not high, such as used in the chemical instrumentation, this is because the needle type globe valve without compensation load changes caused by the function of the flow rate is not stable. Needle type globe valve should be paid attention to the use of the environment, the large range of flow regulating, flow differential pressure changes little, small leakage and regulation of the moment. ( Above is the general situation of the simple routine cut-off valve type)
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