進(jìn)口雙關(guān)雙斷閥旋塞閥，雙密封將軍閥規(guī)范說明/Description of specifications

閥門的設(shè)計(jì)與制造按API6D規(guī)定

法蘭連接尺寸按ANSI B16.5、JB79、HG20592、GB/T9113的規(guī)定；

閥門的結(jié)構(gòu)長度按ANSIB16.10及GB12221-89、JB/T5298的規(guī)定

閥門的檢查與試驗(yàn)按API598及API6D的規(guī)定。

工作原理/Working Principle

雙關(guān)雙斷閥旋塞閥(雙密封將軍閥)在閥門的開/閉過程中，閥體的密封表面與氣門之間沒有接觸，因此密封表面既不摩擦也不磨損M,開/閉扭矩小,使用壽命長retz品牌  During the opening/closing process of the valve, the sealing surface of the valve body does not contact the valve, so the sealing surface does not rub or wear M, the opening/closing torque is small, and the service life is long

1.閥門開啟/Open the valve

閥門開啟時(shí)，先旋轉(zhuǎn)手輪提升旋塞，將密封滑片從閥體兩側(cè)密封面拉回。當(dāng)滑片完全收回脫離閥體密封面后，繼續(xù)轉(zhuǎn)動(dòng)手輪，使旋塞及密封滑片旋轉(zhuǎn)90°，閥門處于開啟位置。To close the valve, first rotate the halndwheel to rotate the cock and the sealing vanes by 90°; then the cock will move downwards; the moving cock drives the sealing vanes to the sealingsurfaces of the valve cavity until the elastic gasket ring is uniformly pressed to the upper and lower ends of the valve bore to achieve sealing.

2.閥門關(guān)閉/Close the valve

閥門關(guān)閉時(shí)，先旋轉(zhuǎn)手輪，將旋塞及密封滑片旋轉(zhuǎn)90°，然后旋塞向下移動(dòng)，隨著旋塞的運(yùn)動(dòng)時(shí)推動(dòng)密封滑片向閥體內(nèi)腔封面直至彈性密封圈被均勻的擠壓到閥孔上下端，形成密封。

To close the valve, first rotate the halndwheel to rotate the cock and the sealing vanes by 90°; then the cock will move downwards; the moving cock drives the sealing vanes to the sealingsurfaces of the valve cavity until the elastic gasket ring is uniformly pressed to the upper and lower ends of the valve bore to achieve sealing.

3.密封性能/Sealing performance

彈性密封圈是模式壓成型在滑片的溝槽中，隨著密封滑片向閥門的進(jìn)出口移動(dòng)，密封圈子也逐漸被壓入溝槽中，經(jīng)過機(jī)械加工的滑片表面與閥體內(nèi)腔形成二級(jí)金屬對金屬密封防止彈性密封圈子繼續(xù)被壓，并且具有防火功能。

The elastic gasket ring is molded and formeed in the groove of the vanes, and as the seaaling vanes move to the valve's inlet and outlet, the gasket ring is also gradually pressed into the groove. The machined vane surfaceforms a secondary metal-to-metal seal with the valve cavity which can prevent the elastic gasket ning from being further pressed and also have a fireproof function.

雙密封方式/Double sealing mode

兩個(gè)獨(dú)立的密封滑片閥孔兩端壓緊（雙關(guān)斷），當(dāng)閥門關(guān)閉時(shí)，泄放閥被打開，檢驗(yàn)密封效果（泄放）

The two separate sealing vanes are compressed on upper and lowerends of the valve bore(double block), and when the valve is closed, the bleed valve will be opened to check the sealing effect (bleed).

4.雙關(guān)雙斷閥及泄放/Double block and bleed valve

這是一種通過兩個(gè)切斷閥和一個(gè)在其中間的泄入閥達(dá)到完全隔斷兩端管線目的的方法，關(guān)閉兩主要閥門關(guān)開啟泄放閥可提高被系統(tǒng)的安全性。如果第一個(gè)閥門泄漏，漏離的介質(zhì)可由開啟的泄放閥導(dǎo)出。

This is a way to achieve complete containment of both ends of the pipeline with two block valves and one bieed valve inbetween. When the two main valves are closed,closing/opening the bleed valvecan improve the system’s safety. If the first valve leaks, the leaked medium can be led out by the opened bleed valve.

進(jìn)口雙關(guān)雙斷閥旋塞閥，雙密封將軍閥性能描述 Performance description

1.防火功能及密封性/Fireproof function and sealing performance

油氣儲(chǔ)運(yùn)系統(tǒng)中的介質(zhì)均為易燃、易爆品。防火是油氣儲(chǔ)運(yùn)裝置在設(shè)計(jì)和選用時(shí)重點(diǎn)關(guān)注的問題，其裝置不僅要求密封性要好，而且在現(xiàn)場發(fā)生火災(zāi)的情況下還具備一定的密封性能 The media in oil and gas storage alnd transportation systems are all flammable and explosive. Being fire-proof is a key focus in designing and selecting an oil and gas storage andtransportation unit which should notonly have a good sealing performancee but also can have a certain sealing performance even when there is fire on the site.

雙關(guān)雙斷閥的密封形式均采用軟、硬密封結(jié)合，其中包括閥瓣及端蓋，底盤等結(jié)構(gòu)。軟密封可以保證在正常運(yùn)行狀態(tài)下零泄漏，當(dāng)現(xiàn)場發(fā)生火災(zāi)時(shí)，軟密封有可能遭到破壞，這時(shí)硬密封將起主密封作用，可防止介質(zhì)大量泄漏。相比較而言，閘閥采用硬密封，防火功能較好，但密封性能不容易得到保證，長期使用難以保證零泄漏∶球閥采用軟密封，其使用壽命較長，但不具備防火功能 The double block and bleed valve all adopts a soft-hard sealing mode,irhcluding discs,end caps,chassis and other structures.The soft seal can ensurezeroleakageinthenormalworking state,but when there is fire on the site.the soft seal may be destroyed. thus the hard seal will function as a primary seal to prevent massive leakageofthemedium. Instead, thegatevalvehasanunreliablesealingperformance and it's difficult to ensure zero leakage during long-term service tlhough it has a good fireproof functionwith its hard seal; and the ball valve,with its soft seal, has a long service life, but it's not fireproof.

2.具有在線維修功能/It has an online maintenance function

當(dāng)閥瓣上的軟密封因某種原因受損造成內(nèi)漏或操縱器（執(zhí)行機(jī)構(gòu)）出現(xiàn)故障時(shí)，不必將閥門從管道上拆下便可進(jìn)行更換或維修，操縱器的維修也可在管道不停壓的狀態(tài)下進(jìn)行。而閘閥或球閥密封部分受損時(shí)，必須將閥門從管道上拆下才能進(jìn)行維修或更換，甚至直接閥門報(bào)廢 When the soft seal on the disc is damaged for a certain reason, resulting in internal leakage or manipulator (actuator) malfunction, it' s not necessary to remove the valve from the pipeline for replacement or maintenance; instead, the manipulator' s rnaintenance can also be done when the pipeline pressure is not stopped. However, the gate valve or ball valve must be removed from the pipeline for maintenance or replacement and even the valve may be just scrapped.

3.具有雙關(guān)斷及泄放功能/It has a double block and bleed function

如圖所示，采用兩個(gè)隔斷閥（閘閥或球閥）來隔斷介質(zhì)，并在這兩個(gè)隔斷閥之間安裝一排泄閥，當(dāng)隔斷閥發(fā)生內(nèi)漏，所泄漏的介質(zhì)將通過排泄閥排出，這樣就不會(huì)造成兩種介質(zhì)的摻混 As shown in the figure, two block valves (gate valve or ball valve) are used to isolate the media, and a drain valve is installed between the two block valves. When the block valve leaks, the leaked media will be discharged through the drain valve, so that the mixing of the two media will not occur.

若采用雙關(guān)雙斷閥，僅需一個(gè)閥就可實(shí)現(xiàn)上述功能(見圖2(b))雙關(guān)雙斷閥的底部有一排螺塞孔，當(dāng)閥門關(guān)閉后，可取出該螺塞。若有一 側(cè)閥瓣產(chǎn)生內(nèi)漏，則漏出的介質(zhì)通過螺塞孔排出，從而避免兩種介質(zhì)摻混現(xiàn)象的發(fā)生。當(dāng)輸送介質(zhì)較臟時(shí)，可定期通過排泄螺塞將沉淀物 排出；當(dāng)管道需要檢修時(shí)，可通過排泄螺塞排出殘存在低處的介質(zhì)。在冬季，可通過排泄螺塞排出內(nèi)腔積水，以防凍壞閥門 If a double close double stop valve is used, the above functions can be achieved with only one valve. There is a row of screw plug holes at the bottom of the double close double stop valve. When the valve is closed, the screw plug can be taken out. If one side of the valve clack has internal leakage, the leaked medium will be discharged through the plug hole, thus avoiding the mixing of the two mediums. When the conveying medium is dirty, the sediment can be regularly discharged through the drain plug; When the pipeline needs maintenance, the residual medium in the lower part can be discharged through the drain plug. In winter, the water in the inner cavity can be drained through the drain plug to prevent the valve from freezing

4.具有中腔泄壓功能/It has a cavity pressure relief function

API6D規(guī)范規(guī)定“對于所有雙密封的閥門，當(dāng)在液體介質(zhì)中使用時(shí)，必須具有壓差泄放功能”,泄放的壓差是因環(huán)境溫度的變化產(chǎn)生 的。在常閉狀態(tài)下，雙密封閥門中腔壓力會(huì)因溫度升高而快速增加，該壓差如不及時(shí)泄放，對閥門的操作將產(chǎn)生嚴(yán)重影響 It's stipulated in API6D:“All valves with double seal must has a pressure difference relief function when used in a liquid medium” . The relief pressure difference is generated from the changes in the ambient temperature.In the normally-closed state, the cavity pressure of the valve with double seal can increase rapidly due to the temperature rise, and if such a pressure difference is not bled promptly, it can have a serious impact on the valve's operation.

手動(dòng)操作的雙關(guān)雙斷閥通常有以下兩種泄壓系統(tǒng) Generally,the double block and bleed valve with manual operation has the following two pressure relief systems.

(1)手動(dòng)泄壓系統(tǒng)：手動(dòng)泄壓系統(tǒng)通常為一安裝在端蓋上的針形閥。當(dāng)介質(zhì)為可 以少量向大氣中排泄的液體時(shí)，可以配備此種泄壓系統(tǒng) Manual pressure relief system:The manual pressure relief system is generally a needle valve mounted on the end cap. When the medium is a liquid which can be slightly bled into the atmosphere, it can be equipped with such a pressure relief system.

(2)差熱式泄壓系統(tǒng)：差熱式泄壓系統(tǒng)是一種帶有單向閥的管路系統(tǒng)(見圖3)。 圖3中針形閥1三通1、單向閥1、三通2和針形閥3構(gòu)成了差熱式泄壓系統(tǒng)。在該系統(tǒng)中，針形閥1常閉、針形閥3常開。當(dāng)介質(zhì)為不可以向大氣中排泄的液體時(shí)，需配備此種泄壓系統(tǒng)(一般是向上游管道中泄壓) Differential thermal pressure relief system: The differential thermal pressure relief system is a pipeline system with a one-way valve(see Fig.3),In Fig.3,the needle valve 1, the tee 1,the one-way valve 1,the tee 2 and the needle valve 3 make up the differential thermal pressure relief system. In the system, the needle valve 1 is normally-closed and the needle valve 3 is normally-open. When the medium is a liquid which cannot be bled into the atmosphere, it shall be equipped with such a pressure relief system(generally pressure relief to the upstream pipeline).

5.具有檢驗(yàn)內(nèi)漏功能/It has an internal leakage detection function

當(dāng)普通閥門處于關(guān)閉狀態(tài)時(shí)，其密封效果的檢測比較困難，而雙關(guān)雙斷閥的檢測則很容易，只要在關(guān)閉狀態(tài)下打開泄壓系統(tǒng)與端蓋相連的針形閥即可，閥瓣若有內(nèi)漏，介質(zhì)就會(huì)通過針形閥流出。若介質(zhì)不便于向大氣排放，則可在針形閥上接一壓力表，通過觀察表壓的變化來判斷有無內(nèi)漏。

When a common valve is closed,it's difficult to detect its sealing effect, while it' s easy to detect the double block and bleed valve, just by mean of opening the needle valve connecting the pressure relief ssystem to the end cap in the closedd state. If the disc has any internal leakage, the medium will flow throuigh the needle valve. If it's not convenient to discharge the medium into the atmosphere, a pressure gauge can be mounted on the needle valve to judge whether there is any internal leakage by means of observing the gauge pressure changes.

6.獨(dú)特的管道減壓功能/Unique pipeline pressure reduction function

管道減壓是儲(chǔ)罐區(qū)管匯設(shè)計(jì)中需要重點(diǎn)考慮的問題，即當(dāng)罐前閥關(guān)閉后，管網(wǎng)中仍然充滿了介質(zhì)；隨著環(huán)境溫度的升高，管網(wǎng)中介質(zhì) 的壓力會(huì)迅速增大；當(dāng)溫差變化較大時(shí)，增加的壓力會(huì)超過管道的承受能力，容易造成管道泄漏。因此，管道應(yīng)配備減壓設(shè)備Pipeline pressure reduction is a key consideration in the design of manifolds in the storage tank area,that is, the pipe network is still full of the medium even after the valve before the tank is closed; as the ambient temperature rises, the pressure of the medium in the pipe network will increase rapidly; when the temperature difference fluctuations are substantial, the increased pressure will exceed the pipe's withstanding ability, which may easily lead to pipeline leakage. Therefore, the pipeline should be equipped with a pressure reduction device

管道減壓設(shè)計(jì)如圖所示，在主切斷閥的上，下游之間連接管道減壓系統(tǒng)，該系統(tǒng)由兩個(gè)截?cái)嚅y(閘閥、球閥或截止閥)及這兩個(gè) 截?cái)嚅y之間的一個(gè)減壓閥組成。該套系統(tǒng)成本高，而且占空間，不方便現(xiàn)場管理 The pipeline pressure reduction design is as shown in  pipeline pressure reduction system is connected between upper and lower reaches of the main block valve, and this system consists of two block valves(gate, ball or globe valve)and a pressure reduction valve between the two block valves. The system is costly and takes up too much room, not easy forsite management

主切斷閥選用雙關(guān)雙斷閥的管道設(shè)計(jì)原理如圖所示，減壓系統(tǒng)附在主切斷閥上，其設(shè)計(jì)結(jié)構(gòu)簡單，占用空間小，且成本低廉 The main block valve adopts the pipeline design principle of  the double block and bleed valve,as  shown in and  the pressure reduction system is attached to the main block valve, with a simple design structure and being space-effective and low-cost

全通徑結(jié)構(gòu) 零部件材質(zhì)表 Parts material table

閥門處于關(guān)閉狀態(tài)時(shí)，閥體上、下游流道口均被閥瓣密封，即雙密封，同時(shí)每個(gè)閥瓣的密封面又能形成軟、硬兩種密封，確保了閥門 的零泄漏。當(dāng)閥瓣旋轉(zhuǎn)時(shí)，軟密封與閥體不接觸，無摩擦，硬密封對軟密封可起到保護(hù)作用，并具有防火功能。

從圖1可以看出，閥芯與耳軸(閥桿)的結(jié)構(gòu)是一體的，上、下耳軸與端蓋、底盤的配合部位有滑動(dòng)軸承(DN>500的雙關(guān)雙斷閥采用 滾動(dòng))。采用這種結(jié)構(gòu)不僅可以減小摩擦阻力，而且便于實(shí)現(xiàn)精加工，以保證密封的旋轉(zhuǎn)間隙。另外，由于閥芯整體性結(jié)構(gòu)以及滑動(dòng)軸承 的存在，確保了閥瓣的密封免受介質(zhì)壓力的影響，即閥門關(guān)閉后兩側(cè)產(chǎn)生的壓差不影響閥門的密封性，這與普通的球閥和閘閥靠壓差來實(shí) 現(xiàn)密封有所不同。

      When the valve is in the closed state, both upper and lower flow channel mouths of the valve body are sealed with discs, namely double seal, and meanwhile two kinds of sealing, soft and hard, can come into being on the sealing surface of each disc, thus

ensuring zero leakage of the valve.When the valve disc is rotating, the soft seal does not contact the valve body, contributing to zero friction, while the hard seal can protect the soft seal and also functions for fire prevention.

      It can be seen from Fig. 1 that the spool and trunnion(stem) structure is integrated,and there are sliding bearings on fitting parts between upper and lower trunnions and the end cap and the chassis (rolling bears are used for those double block and bleed valves    with DN>500).Such a structure can not only reduce the friction resistance but also facilitate precision machining to ensure the seal' s rotation clearance.In addition, the integrated structure of the spool and the presence of the sliding bearings ensure to protect the disc seal from the impact of the medium pressure, that is, the pressure difference generated from both sides after the   valve is closed has no impact on the valve's sealing performance, which is different from the common ball and gate valves which rely on the pressure difference for sealing.

縮徑結(jié)構(gòu) 零部件材質(zhì)表 Parts material table