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.

平板閘閥的長處

Advantages of flat gate valve

流阻小，不縮口的其流阻與短只管的流阻相仿。帶導流孔的平板閘閥安裝在管路上還可直接用清管器進行清管。因為閘板是在兩閥座面上滑動，因此平板閘閥液能合用于帶懸浮顆粒的介質、平板閘閥的密封面實際上是自動定位的。閥座密封面不會遭到閥體熱變形的損壞。并且即使閥門在冷狀態(tài)下封閉，閥桿的熱伸長也不會使密封面遭到過載。當閥門封閉時，無導流孔的平板閘閥亦不需求閘板的封閉方位有較高的精度，因此電動平板閥可用行程來控制啟閉方位。

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.

平板閘閥的缺點

Disadvantages of flat gate valve

當介質壓力低時，金屬密封面的密封力缺少以抵達滿足的密封。相反當介質壓力高時，假定密封面不需要系統(tǒng)介質或外來介質潤滑時，常常啟閉就可能使密封面磨損過大。另一個缺點是，在圓形流道上橫向運動的圓形閘板只有當它處在閥門關方位的50%時，這種閥門對流量的控制才較靈敏。并且，閘板在切斷高速和高密度介質流時，會發(fā)作劇烈振動。假定將閥座做成V形通口并和閘板做緊密的導向，則它也可起到節(jié)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.

平板閘閥選用準則

Selection criteria of flat gate valve

石油、天然氣的運送管線，選用單閘板或雙閘板的平板閘閥。如需清掃管線的，選用單閘板或雙閘板帶導流孔的明桿平板閘閥。

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.

成品油的運送管線和貯存設備，選用無導流孔的單閘板或雙閘板的平板閘閥。

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、天然氣的發(fā)掘井口設備，選用暗桿起浮閥座帶導流孔的單閘板或雙閘板的平板閘閥，大多為API 6A標準，壓力等級為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.

帶有懸浮顆粒介質的管道，選用刀型平板閘閥。

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

城市煤氣運送管線，選用單閘板或雙閘板軟密封明桿平板閘閥。

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

城市自來水工程，選用單閘板或雙閘板無導流孔明桿平板閘閥。(重慶良工閥門銷售

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