cut-off valve is closed ( The disc) Along the center line of the seat valve. It mainly in the line cut off. The use of stop valve is very common, but since the opening and closing torque is bigger, body is longer, nominal size is usually restricted to DN250. In addition, the nominal size of the cut-off valve also associated with job stress. Globe valve is the most obvious advantages as follows: | 1. In the process of opening and closing, due to the friction between the disc and body sealing surface is smaller than gate valves, and wear. 2. Open high than gate valves. 3. Typically on the valve body and disc only a sealing surface, thus making craft is good, easy to maintenance. However, the cut-off valve fault is also nots allow to ignore. The downside is mainly caused by internal body cavity of shape. In the body cavity, medium flows upward from the straight line direction into, thus cause the pressure loss, especially in hydraulic equipment, particularly the pressure loss. Many different kinds of cut-off valve, general according to the position of the valve stem threads, channel form, disc shape classification. The main can be divided into: 1. On the application of this globe valve is threaded stem globe valve is relatively common. Its stem threads in the outside of the shell, not direct contact with the working medium, which can make stem from the media, also facilitate lubrication, easy operation, as shown in figure 2 38. 2. Threaded stem globe valve under the valve stem threads in the valve body, direct contact with the media, not only cannot lubrication, and vulnerable to the media, as shown in figure 2 39. The cut-off valve, multi-purpose in nominal size is small and medium temperature is not high. 3. Straight through the import of cut-off valve medium two channels in the same direction, in 180 & deg; As shown in figure 2 38 and figure 2 39. This form of cut-off valve the flow state of damage is relatively small, therefore, through the pressure loss of valve also corresponding reduced.

4。 Horn type globe valve type globe Industrial Valves inlet channel is not in the same direction on a 90 & deg; - real Angle, as shown in figure 2 40. This form of cut-off valve made by valve change flow direction of medium, so will produce a certain pressure drop. Angle type globe valve is one of the biggest advantages can install the valve in the corner of the pipeline system, such already save 90 & deg; Elbow, and convenient for operation. This kind of valve in the fertilizer plant of synthetic ammonia production system and cooling system.

5。 Three-way valve has three channels cut-off valve, often used as a medium flow direction changes and distribution medium, as shown in figure 2-3 41.

6。 Once-through cut-off valve once-through cut-off valve stem and channel into a point of view, the seat cover and inlet channel Angle; The body can be made into integral, also can be made into separate type, as shown in figure 2 42. Body type globe valve with of two separate body clamp seat in the middle, convenient for manufacture and convenient for maintenance. This kind of stop valve make almost not change flow direction, fluid is cut-off valve for flow resistance smaller; Its installation points straight through close to, but should pay special attention to after the pipe installation should be easy to operation. 7. Plunger valve plunger valve is normal deformation of the cut-off valve. The plunger valve, the valve disc and seat is designed according to the principle of the plunger; Design pillars plug valve, the valve seat valve design of complete sets of rings, rely on plunger valve and set of cooperate to achieve sealing ring. These valves manufacture simple, lantern ring can be made from graphite and ptfe; Good sealing, high and low temperature medium can be used. This valve is mainly used as opening and closing, but the design into a special form of plunger and lantern ring can also be used for flow control. Plunger valve form of agency - as shown in figure 2 23. 8. Needle valve and needle valve is as accurate flow control, usually limited to a small, usually seat hole size smaller than nominal size, as shown in figure 2 44.

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Producing with varied technical skills, ductile iron gate valve can be used in a wide range of applications as cast iron gate valve.
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resilient seated valve flow control valve is slower than y gate valve but has a number of special applications, such as for os&y gate valve.