平板閘閥的用途
The purpose of flat gate valves
平板閘閥廣泛應用于天然氣，石油，化工，自來水管道，城市管道，燃氣管線等運送管線，放空系統(tǒng)和天然氣貯存設備上，用作啟閉設備。Z43型帶導流孔單閘平板閘閥主要應用于天然氣運送和凈化的長輸管線上。
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.
平板閘閥的長處
Advantages of Flat Gate Valves
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 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.
平板閘閥的缺點
Disadvantages of Flat Gate Valves
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, 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.
平板閘閥選用準則
Selection criteria for flat gate valves
1.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。
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。
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。
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.帶有懸浮顆粒介質的管道，選用刀型平板閘閥。
4. For pipelines with suspended particle media, a knife type flat gate valve should be selected.
5.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。
5. For urban gas transportation pipelines, single or double gate soft sealing rising stem flat gate valves should be selected.
6.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
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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