Globe valve is also called the 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 Industrial Valves 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. Globe valves are divided into three categories: straight through cut-off valve, right Angle globe valve and once-through cut-off valve. The most obvious advantage is: in the process of opening and closing, due to the friction between the disc in the valve sealing surface is smaller than gate valves, and wear resistance. Open altitude generally only a quarter of the seat channel diameter, so much smaller than gate valves. Typically on the valve body and disc only a sealing surface, thus making craft is good, easy to maintenance. Globe valve nominal pressure or pressure, PN1. 0 - 16. 0 mpa, ANSI CLASS150 - 900、JIS 10- 20 k, or nominal diameter diameter: DN10 ~ 500, NPS 1/2 ~ 36 ', the cut-off valve connection mode: flange, butt welding, thread, etc. , applicable temperature: - 196 ℃ ~ 700 ℃, the cut-off valve drive mode: manual, bevel gear drive, pneumatic, electric, hydraulic, pneumatic hydraulic linkage, electro-hydraulic linkage, valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8, 304). 、CF3( 304L) 、CF8M( 316). 、CF3M( 316 l) 、Ti。 Choose different material cut-off valve, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media. Stop valve is closed ( The disc) Along the valve seat centerline mobile. According to this mobile form of disc, seat and disc change in his itinerary directly proportional relationship. Due to open or close the valve stem travel relatively short, and very reliable cutting function, and due to the change of his seat and disc stroke proportional relationship, is very suitable for the traffic regulation. Therefore, this type of valve is well suited for use as cut off or adjust and throttling. Globe valve selection principle is: 1. The high temperature and high pressure medium or device appropriate chooses cut-off valve. Such as power plants, nuclear power stations, petrochemical system of high temperature and high pressure piping. 2. Convection resistance is relaxed on the pipeline on the pipeline. Thinking about small place of pressure loss. 3. Small valves can choose needle valve, instrument valve, the sampling valve, pressure gauge valve, etc. 4. Flow adjustment or pressure adjustment, but the adjustment accuracy is not high, and pipe diameter and the relatively small, such as nominal drift diameter of 50 mm or less piping, appropriate chooses. 5. Synthetic fertilizer and chemical fertilizer in the industrial production appropriate chooses 16 mpa or PN320 PN160 nominal pressure, nominal pressure, nominal pressure of 32 mpa pressure Angle globe valve or pressure Angle globe valve. 6. Desilication workshop in bayer process of alumina production, easy to coking on the pipeline, easy to choose seat can be separated type, body place, carbide seal once-through cut-off Industrial Valves or once-through globe valve. 7. City water supply, heat supply engineering in construction, nominal menstruation smaller pipes, globe valves, balance valves or optional plunger valve, the pipeline such as nominal drift diameter less than 150 mm.
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