進口帶放散燃氣平板閘閥密封面采用金屬或者軟型多層次密封圈結構，提高密封副抗介質中雜質破壞的能力，閥門全開或者全關時，密封副完全把管網通道與閥門腔隔離開來，閥座密封副完全被閘板覆蓋，阻止了管網中的雜質，粉塵，焦油，以及氣流對密封副的破壞和沖蝕，有效的保證了閥門的密封性能 RETZ The sealing surface of (with release) gas flat gate valve adopts metal or soft multi-level sealing ring structure to improve the sealing pair's ability to resist the damage of impurities in the medium. When the valve is fully opened or closed, the sealing pair completely separates the pipe network channel from the valve chamber, and the valve seat sealing pair is completely covered by the gate, preventing the damage and erosion of impurities, dust, tar, and air flow to the sealing pair, The sealing performance of the valve is effectively guaranteed.

進口帶放散燃氣平板閘閥性能描述 Performance description

產品采用標準Technical Specification

設計標準Design standard：API 6D ,ASMEB16.34

結構長度Structuralength：API 6D ,ASMEB16.10

連接法蘭Flanged ends：ASMEB16.5 MSS SP44，GB/T9113 JB/T79

對焊端Butt-weldingends：ASMEB16.25，GB/T 12224

試驗和檢驗Test & inspection：API 6D ，API 598

適應溫度Applicable temperature ：-29~121℃

公稱壓力 Nominal pressure：16-6.4Mpa，CL150-300LB

規格尺寸 size：1~20”

流量特性分析Flow Charalteristic

帶導流孔的平板閘閥，其流量特性等同于同規格的管道，呈等百分比特性，不帶導流孔的平板閘閥，其中腔跨度較楔式閘閥小，且屬于規則的圓柱體，所以，基本上除壓力損失較帶導流孔的大外，其余特性基本接近。不帶導流孔調節型的平板閘閥其對流量的調節特性優于普通不帶導流孔的平板閘閥 retz品牌 The flow characteristic of flat gate valves with a diversion hole is equal to that of pipelines of thesame specification. The characteristic is shown in per centum form. As for valves without a diversion hole, its cavity fly span is smaller than that of wedge gate vales and it is a regular cylindrical object,therefore,characteristics of the valves are similar except that they have a larger pressure loss.Besides, their flux adjustment behavior is better than that of the ones with a deversion hole.

閥門開度——Cv特性曲線表Valve-opening—Cv characteristic graph

●工作原理WorkingPrinciple

1、閥門內部壓力相當時（1），閘板處于閉合狀態，閥座表面PTFE密封環形成初始密封，每次閥門開或關時，閥座圈能清潔閘板兩側。（如圖1）

With equal pressure throughout the valve(and the gate in closed position), and initial seal(1)is formed with the raised PTFE ring on the faces of the seats.(The seat-inserts clean both sides of the gate each time the valve is opened or closed)

2、對閥門施加管道壓力時（2），壓力作用于閘板，迫使它貼近出口閥座上的PTFE環，壓縮它直到閘板停在鋼制閥座上，這樣，就形成了雙重密封，首先是PTFE對金屬密封，然后是金屬對金屬密封，閥座也被牢固地推到凹槽，在這一點（3），O形圈阻止任何后部介質流。（如圖2）

As line pressure(2)is applied to the valve. it acts on the gate, forcing it against the PTFE ring on the downstream seat,compressing it until the seat against the steel seat. Thus, a double seal is formed...first,a PTFE-to-metal seal;then, metal-to-metal. The seat is also forced firmly into its recess. The O-ring(3) prevents any downstream flow at this point.

3、閥腔壓力泄放后，形成進口密封，管道壓力作用于進口閥座（4），使其移向閘板，這時形成PTFE對金屬的密封，同時，O形圈（5）與閥座凹槽形成緊密的密封。（如圖3）

Upstream seal is provided when valve cavity pressure is bled off. This is caused by the force of line pressure acting against the upstream seat(4)moving the seat against the gate and providing a tight PTFE-to metal seal at this point. At the same time. the O-ring(5)forms a tight seal with the seat recess.

4、閥門自動泄放多余的壓力，當閥腔壓力大于管道壓力時，由于熱膨脹，進口閥座推向凹槽，閥腔內多余的壓力在閥座與閘板之間泄放到管道中。（如圖4）

Valve automatically relieves itself of excessive valve cavity pressure.When valve cavity pressure exceeds line pressure..from such causes as thermal expansion..the upstream seat is forced back into its recess and the excess pressure in the valve cavity is bled between the seat and the gate into the line.

●產品結構特點Products Design Features

閥座采用C形密封圈密封和施加預緊力的浮動閥座結構，使閥門進出口雙向密封；并且該結構的啟閉力矩僅為普通閥門的1/2，能達到輕松開、關閥門。

The seat ring uses the floating seat ring structure with o-seaI ring sealed and pre-tightening force applied to have inlet and outlet dual-way sealed; and the open-close moment with this structure is 1/2 that of the common valves only, able to lightly open and close valves.

閥座采用密封面上鑲嵌PTFE，具有PTFE對金屬和金屬對金屬的雙重密封，PTFE密封面同時清除閘板臟物的作用。

The seat ring uses the sealing face inlaid with PTFE,so has dual seals of PTFE to metal and metal to metal, the PTFE sealing face also acts as removing the dirt on the wedge disc.

閥門的閘板，無論是全開或是全關始終與密封面吻合，密封面得到保護不受介質直接沖刷，從而延長使用壽命。

The wedge disc of the valve is always fitted with the sealing face whether in full open or full close status to have the sealing face protected without being directly eroded by the medium so as to extend the duration.

閥門在全開時，通道平滑為直線，流阻系數極小，無壓力損失，可通毛球清掃管線。

When fully opened, the valve's channel is smooth and linear, with an extremely small flow resisting coefficient and no pressure loss, and the pipeline can be cleaned with hair-ball through it.

閥門關閉時能自動卸掉內腔高壓（詳見工作原理圖），保證使用安全。

Automatic removal of the high pressure in the internal cavity wheen the valve is about to close(see the working principle diagram for the details)so as to ensure safety.

采用封閉齒輪轉動啟閉指示機構，能長期清晰地反映閥門的啟閉情況。

Use a sealed gear-driving open-close indicating mechanism, which is able to clearly show the open-close condition of the valve in a long term.

直埋式閥門外表面采用環氧煤瀝青防腐處理，能與管線同壽命。

The external surface of the directly built-in valve is corrosion resisting treated with epoxy coal bitumen and can be the same duration as the pipeline.

帶導流孔型平板閘閥的DN—Cv曲線圖 DN-Cv Graph of Flat Valves with a Diversion Hole

主要零件材料Major Parts Material Form

安裝示意圖Install the Sketch Map

1、埋地管線Underground pipeline 

2、水泥澆注面Cement poured surface 

3、閥室Valve room

4、埋地介質Underground medium 

5、閥室蓋 Bonnet room 

6、閥門 Valve

7、放散管Place scattered pipes

8、磚墻 Brick wall 

9、路面Pavement