平板闸阀的用途
The purpose of flat gate valves
平板闸阀广泛应用于天然气，石油，化工，自来水管道，城市管道，燃气管线等运送管线，放空系统和天然气贮存设备上，用作启闭设备。Z43型带导流孔单闸平板闸阀主要应用于天然气运送和净化的长输管线上。
Flat gate valves are widely used in natural gas, petroleum, chemical, tap water pipelines, urban pipelines, gas pipelines, and other transportation pipelines, vent systems, and natural gas storage equipment, as opening and closing equipment. The Z43 type single gate flat gate valve with diversion holes is mainly used in long-distance pipelines for natural gas transportation and purification.
平板闸阀的长处
Advantages of Flat Gate Valves
流阻小，不缩口的其流阻与短只管的流阻相仿。带导流孔的平板闸阀安装在管路上还可直接用清管器进行清管。因为闸板是在两阀座面上滑动，因此平板闸阀液能合用于带悬浮颗粒的介质、平板闸阀的密封面实际上是自动定位的。阀座密封面不会遭到阀体热变形的损坏。并且即使阀门在冷状态下封闭，阀杆的热伸长也不会使密封面遭到过载。当阀门封闭时，无导流孔的平板闸阀亦不需求闸板的封闭方位有较高的精度，因此电动平板阀可用行程来控制启闭方位。
The flow resistance is small, and the flow resistance of a non shrinking mouth is similar to that of a short tube. The flat gate valve with a diversion hole can be installed on the pipeline and can also be cleaned directly with a pig. Because the gate slides on two valve seat surfaces, the flat gate valve fluid can be used for media with suspended particles, and the sealing surface of the flat gate valve is actually automatically positioned. The sealing surface of the valve seat will not be damaged by thermal deformation of the valve body. And even if the valve is closed in a cold state, the thermal elongation of the valve stem will not overload the sealing surface. When the valve is closed, flat gate valves without diversion holes do not require high accuracy in the sealing direction of the gate plate. Therefore, electric flat gate valves can use stroke to control the opening and closing direction.
平板闸阀的缺点
Disadvantages of Flat Gate Valves
当介质压力低时，金属密封面的密封力缺少以抵达满足的密封。相反当介质压力高时，假定密封面不需要系统介质或外来介质润滑时，常常启闭就可能使密封面磨损过大。另一个缺点是，在圆形流道上横向运动的圆形闸板只有当它处在阀门关方位的50%时，这种阀门对流量的控制才较灵敏。并且，闸板在切断高速和高密度介质流时，会发作剧烈振动。假定将阀座做成V形通口并和闸板做紧密的导向，则它也可起到节流的作用。
When the medium pressure is low, the sealing force of the metal sealing surface is insufficient to achieve satisfactory sealing. On the contrary, when the medium pressure is high, assuming that the sealing surface does not require lubrication from the system medium or external medium, frequent opening and closing may cause excessive wear on the sealing surface. Another disadvantage is that the circular gate that moves laterally on the circular flow channel is only more sensitive to flow control when it is 50% of the valve's closed position. Moreover, the ram will experience severe vibration when cutting off high-speed and high-density media flow. Assuming that the valve seat is made into a V-shaped port and tightly guided with the gate, it can also play a throttling role.
平板闸阀选用准则
Selection criteria for flat gate valves
1.石油、天然气的运送管线，选用单闸板或双闸板的平板闸阀。如需清扫管线的，选用单闸板或双闸板带导流孔的明杆平板闸阀。
1. For oil and natural gas transportation pipelines, single or double gate flat gate valves should be selected. If it is necessary to clean the pipeline, choose a single or double gate plate gate valve with a guide hole.
2.成品油的运送管线和贮存设备，选用无导流孔的单闸板或双闸板的平板闸阀。
2. For the transportation pipeline and storage equipment of finished oil, single gate or double gate flat gate valves without diversion holes should be selected.
3.石油、天然气的发掘井口设备，选用暗杆起浮阀座带导流孔的单闸板或双闸板的平板闸阀，大多为API 6A标准，压力等级为API2000、API3000、API5000、API10000、API15000、API20000。
3. For oil and natural gas exploration wellhead equipment, single gate or double gate flat gate valves with non rising stem floating valve seats and diversion holes are selected, mostly in accordance with API 6A standards, with pressure ratings of API2000, API3000, API5000, API10000, API15000, and API20000.
4.带有悬浮颗粒介质的管道，选用刀型平板闸阀。
4. For pipelines with suspended particle media, a knife type flat gate valve should be selected.
5.城市煤气运送管线，选用单闸板或双闸板软密封明杆平板闸阀。
5. For urban gas transportation pipelines, single or double gate soft sealing rising stem flat gate valves should be selected.
6.城市自来水工程，选用单闸板或双闸板无导流孔明杆平板闸阀
6. For urban water supply projects, single or double gate open stem flat gate valves without diversion holes should be selected
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