The flat gate valve is widely used in natural gas, petroleum, chemical, water pipeline, urban pipeline, gas pipeline and other transportation pipelines, vent system and natural gas storage equipment, as a hoist. Z43 single-gate flat gate valve with diversion hole is mainly used in long-distance pipeline for natural gas transportation and purification.

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。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 the non-shrinking pipe is similar to that of the short pipe. The flat gate valve with diversion hole can also be directly used for pigging when installed on the pipeline. Because the gate slides on two seat surfaces, the flat gate valve fluid can be used for the medium 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 the thermal deformation of the valve body. And even if the valve is closed in cold state, the thermal elongation of the valve rod will not overload the sealing surface. When the valve is closed, the flat gate valve without diversion hole does not need high accuracy of the closing position of the gate plate, so the electric flat valve can control the opening and closing position 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 insufficient to achieve satisfactory sealing. On the contrary, when the medium pressure is high, it is assumed that the sealing surface does not need the lubrication of system medium or foreign medium, often opening and closing may cause excessive wear on the sealing surface. Another disadvantage is that the circular gate moving transversely on the circular flow channel is more sensitive to flow control only when it is 50% of the valve closing position. In addition, the ram will vibrate violently when cutting off high-speed and high-density media 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

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。

For oil and natural gas transportation pipelines, flat gate valves with single or double rams shall be selected. If it is necessary to clean the pipeline, the rising stem flat gate valve with single or double rams and diversion holes shall be selected.

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。

For the transportation pipeline and storage equipment of refined oil, the flat gate valve with single or double rams without diversion holes shall be selected.

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。

For oil and natural gas exploration wellhead equipment, single-ram or double-ram flat gate valves with non-rising valve seats and diversion holes are selected, most of which are API 6A standards, with pressure ratings of API2000, API3000, API5000, API10000, API15000 and API20000.

带有悬浮颗粒介质的管道，选用刀型平板闸阀。

For pipes with suspended particle medium, knife type flat gate valve shall be selected.

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。

Single-ram or double-ram soft seal rising stem flat gate valve shall be selected for urban gas transmission pipeline.

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。(重庆良工阀门销售

For urban water works, single gate or double gate rising stem flat gate valve without diversion hole shall be selected. (Chongqing Lianggong Valve Sales Center