Flat gate valve is widely used in transportation pipelines such as natural gas, petroleum, chemical industry, tap water pipeline, urban pipeline and gas pipeline, vent system and natural gas storage equipment as opening and closing equipment. Z43 single gate flat gate valve with diversion hole is mainly used in long-distance natural gas transportation and purification pipelines.

平板闸阀的长处

Advantages of flat gate valve

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。

The flow resistance is small, and the flow resistance without necking is similar to that of a short tube. The flat gate valve with diversion hole is installed on the pipeline and can also be pigged directly with a pig. Because the gate valve slides on the two seat surfaces, the liquid of the flat gate valve can be used for the medium with suspended particles, and the sealing surface of the flat gate valve is actually positioned automatically. The sealing surface of the valve seat will not be damaged by the thermal deformation of the valve body.

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。

And even if the valve is closed in the cold state, the thermal extension of the valve stem will not overload the sealing surface. When the valve is closed, the flat gate valve without diversion hole does not require high precision in the closing direction of the ram, so the electric flat valve can control the opening and closing direction by stroke.

平板闸阀的缺点

Disadvantages of flat gate valve

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 lack to meet the sealing requirements. On the contrary, when the medium pressure is high, assuming that the sealing surface does not need system medium or external medium lubrication, the frequent opening and closing may cause excessive wear of the sealing surface. Another disadvantage is that the circular gate moving laterally on the circular flow channel is more sensitive to flow control only when it is 50% of the valve closing position. Moreover, the RAM will vibrate violently when cutting off the high-speed and high-density medium flow. Assuming that the valve seat is made into a V-shaped port and closely guided with the gate, it can also play the role of throttling.

平板闸阀选用准则

Selection criteria of flat gate valve

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 gate valve or double gate valve shall be selected. If the pipeline needs to be cleaned, the rising stem flat gate valve with single ram or double ram and guide hole shall be selected.

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 product oil, single gate valve or double gate valve without diversion hole shall 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API6A标准，压力等级为API2000、API3000、API5000、API10000、API15000、API20000。

3. For oil and natural gas exploration wellhead equipment, single or double ram flat gate valves with Non rising stem valve seat and guide hole are selected, most of which are api6a standard, and the pressure grades are 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. Knife type flat gate valve shall be selected for the pipeline with suspended particle medium.

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. Single or double ram soft sealing rising stem flat gate valve shall be selected for urban gas transportation pipeline.

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. Single gate valve or double gate valve with rising stem without diversion hole shall be selected for urban tap water project