WO2016058152A1 - 闸阀及其制作工艺 - Google Patents
闸阀及其制作工艺 Download PDFInfo
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- WO2016058152A1 WO2016058152A1 PCT/CN2014/088701 CN2014088701W WO2016058152A1 WO 2016058152 A1 WO2016058152 A1 WO 2016058152A1 CN 2014088701 W CN2014088701 W CN 2014088701W WO 2016058152 A1 WO2016058152 A1 WO 2016058152A1
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- WIPO (PCT)
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- valve
- valve body
- right connecting
- cover
- stem
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/10—Welded housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Definitions
- the invention relates to the field of valves, in particular to a gate valve and a manufacturing process thereof.
- the high-pressure gate valve has reasonable structure, reliable sealing and light operation. Its sealing surface is spray-welded with hard alloy, which has the advantages of anti-corrosion, wear-resistance and erosion resistance, and can be used for throttling, especially suitable for working pressure ⁇ 42MPa, working temperature. Water, oil, mud and natural gas pipelines of ⁇ 120 °C are used as opening and closing and regulating devices for controlling medium flow. It can be seen that the gate valve is widely used, and is mainly applied to the underground mining of oil, natural gas, strontium nitrate, salt liquid and the transportation of oil and gas pipelines.
- conventional high-pressure gate valves use a valve body monolithic casting or forging type in production. Therefore, it is not only time-consuming and labor-intensive, but also difficult to process, and the final process size, which requires special clamping fixtures during processing. It is also not easy to get a guarantee.
- the technical problem to be solved by the present invention is to solve many quality problems such as air holes, blisters and other defects in the integral casting of the existing valve body, and also need to use a special clamping fixture, which is not only time-consuming and laborious, but also makes the processing difficult. Increased problem.
- the technical solution adopted by the present invention is to provide a gate valve including a valve body having a three-way structure, wherein a valve cover is connected to an opening of an upper end of the valve body, and the valve cover is attached a through hole is formed, the valve stem penetrates into the valve body through the through hole, and the upper end of the valve stem is vertically connected with a hand wheel, and the lower end is connected with a valve plate for controlling opening and closing, and the valve body is fitted with a valve body a stuffing box, and the bonnet is pressed against the stuffing box, a top end of the valve cover is connected with a valve stem nut, and a positioning sleeve is disposed in the valve cover and between the valve stem nut, Positioning sleeve There are a plurality of thrust ball bearings, the upper end of the positioning sleeve is provided with a screw plug for locking, and the left and right opposite ends of the lower end of the valve body are respectively inserted with a left connecting
- valve plate and the valve stem are connected by a dovetail slot, and the valve cover is connected and connected to the valve body by a screw connection.
- the outer circumferential surfaces of the left and right connecting pipes are respectively provided in a stepped shape having a small inside and a large outer diameter, and the outer circumferential surface of the small diameter portion is provided with a thread for connection with the valve body.
- valve seat is connected to the left and right connecting pipes by a clearance fit, and the first sealing groove is sealed between the left and right connecting pipes and the valve seat, A plurality of O-rings are provided in the first sealing groove.
- a second sealing groove is disposed between the stuffing box and the valve stem and between the stuffing box and the valve body, and a plurality of O-rings are disposed in the second sealing groove.
- the upper end of the valve stem nut is provided with an indicator cover, the indicating cover is provided with an indicating sign, and the upper end of the valve stem is connected with an indicator pin.
- the invention also provides a process for manufacturing the above-mentioned gate valve, which adopts an exploded processing process, comprising the following steps:
- Step 1 respectively, the valve body and the left and right connecting tubes are formed
- Step 2 The valve seat is arranged on the inner side of the left and right connecting pipes by means of a clearance fit, and is sealed by providing an O-ring;
- Step 3 The valve body and the left and right connecting pipes are connected by screwing, and are positioned by the positioning step, and the welding process is performed on the outer contact surface of the valve body and the left and right connecting pipes after assembly;
- Step 4 connecting the valve stem and the valve plate through the dovetail groove, passing through the valve seat from top to bottom, and entering the valve body;
- Step 5 Install the stuffing box in the valve body, and install the valve stem and the stuffing box with a clearance fit, and seal the stuffing box and the valve stem and the stuffing box and the valve body through the O-ring;
- Step 6 the valve cover and the valve body are screwed, the valve cover is pressed against the stuffing box, and the valve cover is locked with the nut on the valve body;
- Step 7 Install a thrust ball bearing between the valve cover and the stem nut, and lock the screw by pressing the screw plug above the thrust ball bearing;
- Step 8 Screw the slotted taper end set screw to the screw plug on the side of the bonnet to lock the plug to the bonnet;
- Step 9 A hand wheel for controlling opening and closing of the valve plate is disposed at an upper end of the valve stem nut, and the hand wheel and the stem nut are connected by a flat key;
- Step 10 Install an indicator cover on the upper end of the stem nut, and set the indicator pin to the upper end of the valve stem through a screw connection, and lock it with a nut.
- step 1 the processing steps of the valve body are as follows:
- valve body blank face to face
- degree of symmetry is ensured to obtain a valve body that meets the requirements for use.
- step 1 the processing steps of the left and right connecting pipes are as follows:
- the dimensional tolerances of the thread end faces of the left and right connecting pipe blanks to the end faces of the positioning step are controlled to be 0 to -0.02 mm, and the left and right connecting pipes satisfying the use requirements are obtained.
- step 3 the welding process of the valve body and the left and right connecting pipes is as follows: welding by carbon dioxide gas shielded welding; when welding, the welding current is controlled at 150 ⁇ 180A, the welding voltage is controlled at 18V, the gas flow rate is controlled at 18 ⁇ 20L/min, and the aging treatment is performed after welding.
- components in a gate valve such as a valve body, a left and a right connecting pipe and a valve stem are respectively processed by an exploded machining method, and then assembled, and the structure and the method thereof are not required in the process of gate valve processing.
- the use of special fixtures reduces the labor intensity and reduces the machining time.
- the double bearing positioning of the thrust ball bearing in the stem nut makes the opening of the valve lighter and less laborious; multiple seals are used throughout the valve.
- the structure ensures zero leakage of the valve; and the sealing part between the valve plate and the valve seat is made of alloyed alloy powder, which has the advantages of wear resistance and long service life.
- Figure 1 is a schematic view of the structure of the present invention
- Figure 2 is a schematic view showing the structure of the valve body and the left and right connecting pipes in the present invention.
- the present invention provides a gate valve including a valve body 1 having a three-way structure.
- the upper end of the valve body 1 is connected with a valve cover 2 through a valve port, and the valve cover 2 is provided with a through hole.
- the valve stem 3 penetrates into the valve body 1 through the through hole, and the upper end of the valve stem 3 is vertically connected with the hand wheel 4, the lower end of which is connected with a valve plate 5 for controlling opening and closing, and the valve body 1 is internally provided with a stuffing box 6, and The bonnet 2 is pressed against the stuffing box 6.
- the top end of the bonnet 2 is connected with a valve stem nut 7.
- a locating sleeve 8 is arranged in the bonnet 2 and between the valve stem nut 7.
- the positioning sleeve 8 is provided with a plurality of thrust balls.
- the upper end of the positioning sleeve 8 is provided with a screw plug 9 for locking, and the left and right connecting tubes 10 are respectively inserted into the opposite openings of the lower end of the valve body, and the left connecting tube and the right connecting tube are close to the valve plate.
- the inner end is provided with a valve seat, and the outer circumferential surfaces of the left connecting pipe and the right connecting pipe are respectively welded and fixed to the left and right sides of the lower end of the valve body.
- valve plate 5 and the valve stem 3 are snap-fitted through the dovetail slot, and the valve cover 2 and the valve body 1 are threaded Connect the way to install the connection.
- the outer circumferential surfaces of the left and right connecting pipes are respectively provided in a stepped shape having a small inside and a large outer diameter, and the outer circumferential surface of the small diameter portion is provided with a thread for connection with the valve body.
- valve seat 11 and the left and right connecting pipes 10 are connected by a clearance fit, and a first sealing groove 12 for sealing is disposed between the left and right connecting pipes 10 and the valve seat 11, and a plurality of O are arranged in the first sealing groove 12. Sealing ring.
- a second sealing groove 13 is disposed between the stuffing box 6 and the valve stem 3 and between the stuffing box 6 and the valve body 1.
- the second sealing groove 13 is provided with a plurality of O-rings.
- the upper end of the nut of the valve stem 3 is provided with an indicator cover 14 on which the indication plate 15 is provided, and the indicator pin 16 is connected to the upper end of the valve stem 3.
- the invention also provides a process for manufacturing the above-mentioned gate valve, which adopts an exploded processing process, comprising the following steps:
- Step 1 respectively, the valve body 1 and the left and right connecting tubes 10;
- Step 2 the valve seat 11 is disposed on the inner side of the left and right connecting pipes 10 by means of a clearance fit, and is sealed by providing an O-ring;
- Step 3 the valve body 1 and the left and right connecting pipes 10 are screwed and positioned by the positioning step, and the welding process is performed on the outer contact surface of the valve body 1 and the left and right connecting pipes 10 after assembly;
- Step 4 connecting the valve stem 3 and the valve plate 5 through the dovetail groove, passing through the valve seat 11 from top to bottom, and entering the valve body 1;
- Step 5 The stuffing box 6 is stuck in the valve body 1, the valve stem 3 and the stuffing box 6 are installed by a clearance fit, and the stuffing box 6 and the valve stem 3 and the stuffing box 6 and the valve body 1 are carried out through the O-ring. seal;
- Step 6 the valve cover 2 and the valve body 1 are screwed, the valve cover 2 is pressed against the stuffing box 6, and the valve cover is locked with the nut on the valve body;
- Step 7 A thrust ball bearing is disposed between the valve cover 2 and the stem nut 7 to reduce the torque, and is locked by pressing the screw plug 9 above the thrust ball bearing;
- Step 8 screwing the slotted taper end set screw 17 to the screw plug 9 on the side of the valve cover 2, thereby locking and fixing the screw plug 9 to the valve cover 2;
- Step 9 A hand wheel 4 for controlling opening and closing of the valve plate is disposed at an upper end of the valve stem nut 7, and the hand wheel 4 and the valve stem nut 7 are connected by a flat key 18;
- Step 10 An indicator cover 14 is provided at the upper end of the stem nut 7, and the indicator needle 16 is disposed at the upper end of the valve stem 3 by screwing and is locked with a nut.
- step 1 the processing steps of the valve body are as follows:
- valve body blank face to face
- degree of symmetry is ensured to obtain a valve body that meets the requirements for use.
- step 1 the processing steps of the left and right connecting pipes are as follows:
- the dimensional tolerances of the thread end faces of the left and right connecting pipe blanks to the end faces of the positioning step are controlled to be 0 to -0.02 mm, and the left and right connecting pipes satisfying the use requirements are obtained.
- step 3 the welding process of the valve body and the left and right connecting pipes is as follows: welding with carbon dioxide gas shielded welding; when welding, the welding current is controlled at 150-180 A, the welding voltage is controlled at 18 V, and the gas flow rate is controlled at 18 ⁇ . 20L/min, aging treatment after welding.
- components in a gate valve such as a valve body, a left and a right connecting pipe and a valve stem are respectively processed by an exploded machining method, and then assembled, and the structure and the method thereof are not required in the process of gate valve processing.
- Reuse special fixtures to reduce labor intensity and improve product accuracy And the qualification rate also reduces the machining time; at the same time, the double bearing positioning of the thrust ball bearing in the stem nut makes the opening of the valve more light and labor-saving; the multiple sealing structure is adopted throughout the valve to ensure the valve Zero leakage; the sealing part between the valve plate and the valve seat is made of surfacing alloy powder, which has the advantages of wear resistance and long service life.
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Abstract
一种闸阀及其制作工艺方法，其中，闸阀包括具有三通结构的阀体（1），阀体的上端开口处连接有阀盖（2），阀杆（3）穿入阀体内，且阀杆的上端垂直连接有手轮（4），其下端连接有控制开闭的阀板（5），阀体的下端左、右相对设置的开口内分别插装左连接管和右连接管，左连接管和右连接管靠近阀板的内端上均设有阀座，左连接管和右连接管的外圆周面分别与阀体的下端左、右侧面焊接固定；该制作工艺方法将阀体、左、右连接管等闸阀中的部件锻造成型再分别加工，然后进行组装。这种结构及其制作工艺方法无需再使用专用夹具，降低了劳动强度，减少了机加工的时间。
Description
本发明涉及阀门领域，具体涉及闸阀及其制作工艺。
高压闸阀的结构合理，密封可靠，操作轻便，其密封面均喷焊硬质合金，具有防腐、耐磨、耐冲蚀等优点，且可用于节流，尤其适用于工作压力≤42MPa，工作温度≤120℃的水、油、泥浆、天然气管线作控制介质流动的启闭及调节装置。由此可知，闸阀应用较广，主要适用于石油、天然气、硭硝、盐液地下的开采和油料、煤气管道的输送。但是，常规的高压闸阀在生产中采用阀体整体式铸造或锻造成型的方法，因此，在加工时需要使用专门的装夹夹具,不仅费时费力,还使得加工难度增大，且最终的工艺尺寸也不易得到保证。
发明内容
本发明所要解决的技术问题是解决现有闸阀阀体整体式铸造成型会出现很多质量问题，例如气孔、砂眼及其他缺陷，同时还需要使用专门的装夹夹具，不仅费时费力,还使得加工难度增大的问题。
为了解决上述技术问题，本发明所采用的技术方案是提供一种闸阀，包括具有三通结构的阀体，其特征在于，所述阀体的上端开口处连接有阀盖，所述阀盖上设有通孔，阀杆通过所述通孔穿入所述阀体内，且所述阀杆的上端垂直连接有手轮，其下端连接有控制开闭的阀板，所述阀体内卡装有填料函，且所述阀盖压紧在所述填料函上，所述阀盖的顶端连接有阀杆螺母，所述阀盖内且与所述阀杆螺母之间设有定位套，所述定位套内设
有若干推力球轴承，所述定位套的上端设有用于锁紧的螺塞，所述阀体的下端左、右相对设置的开口内分别插装左连接管和右连接管，所述左连接管和所述右连接管靠近所述阀板的内端上均设有阀座，所述左连接管和所述右连接管的外圆周面分别与所述阀体的下端左、右侧面焊接固定。
在上述方案中，所述阀板和所述阀杆通过燕尾槽卡装连接，且所述阀盖与所述阀体通过螺纹连接的方式安装连接。
在上述方案中，所述左、右连接管的外圆周面均分别设置成内小外大的台阶状，其小直径部的外圆周面上设有用于与所述阀体连接的螺纹。
在上述方案中，所述阀座与所述左、右连接管采用间隙配合连接，且所述左、右连接管与所述阀座之间设有起密封作用的第一密封槽，所述第一密封槽内设有若干O型密封圈。
在上述方案中，所述填料函与所述阀杆之间以及所述填料函与所述阀体之间设有第二密封槽，所述第二密封槽内设有若干O型密封圈。
在上述方案中，所述阀杆螺母的上端设有指示罩，所述指示罩上设有起指示作用的标牌，且所述阀杆的上端连接有指示针。
本发明还提供了一种制作上述闸阀的工艺方法，采用分解式加工工艺，包括如下步骤：
步骤1、分别制作阀体和左、右连接管；
步骤2、在左、右连接管的内侧通过间隙配合的方式设置阀座，并通过设置O型密封圈进行密封；
步骤3、将阀体和左、右连接管通过螺纹连接，并通过定位台阶定位，在阀体与左、右连接管组装后的外接触面上进行焊接处理；
步骤4、将阀杆和阀板通过燕尾槽连接，自上而下穿过阀座，进入阀体内；
步骤5、将填料函卡装在阀体内，阀杆与填料函采用间隙配合安装，并通过O型密封圈进行填料函与阀杆以及填料函与阀体的密封；
步骤6、将阀盖与阀体通过螺纹连接，至阀盖压紧在填料函上,并用螺母将阀盖锁紧在阀体上；
步骤7、在阀盖与阀杆螺母之间设置推力球轴承，并通过在推力球轴承的上方压紧螺塞将其锁紧；
步骤8、在阀盖侧面旋入开槽锥端紧定螺钉至螺塞，从而将螺塞锁紧固定在阀盖上；
步骤9、在阀杆螺母的上端设置用于控制阀板开闭的手轮，且手轮与阀杆螺母通过平键连接；
步骤10、在阀杆螺母的上端设置指示罩，且将指示针通过螺纹连接设置在阀杆的上端，并用螺母锁紧。
在上述方案中，在步骤1中，阀体的加工工艺步骤如下：
锻造阀体毛坯件；
进行正火、回火等热处理工艺；
检验经过热处理后的阀体毛坯件是否满足强度、硬度等使用要求；
通过机加工等机械加工方式，将阀体毛坯件结构长度(面对面)的尺寸公差控制在0～+0.05mm，并保证对称度，得到符合使用要求的阀体。
在上述方案中，在步骤1中，左、右连接管的加工工艺步骤如下：
锻造左、右连接管毛坯件；
进行正火、回火等热处理工艺；
检验经过热处理后的左、右连接管毛坯件是否满足强度、硬度等使用要求；
通过机加工等机械加工方式，将左、右连接管毛坯件螺纹端面到定位台阶端面的尺寸公差控制在0～-0.02mm，得到符合使用要求的左、右连接管。
在上述方案中，在步骤3中，阀体与左、右连接管的焊接工艺要求如下：采用二氧化碳气体保护焊进行焊接；焊接时，焊接电流控制在150～
180A，焊接电压控制在18V,气体流速控制在18～20L/min，焊后进行时效处理。
本发明，采用分解式加工的方式，将阀体、左、右连接管和阀杆等闸阀中的部件分别加工出来，然后进行组装，这种结构及其工艺方法，在闸阀加工的过程中无需再使用专用夹具，降低了劳动强度，也减少了机加工的时间；同时，在阀杆螺母中采用推力球轴承的双轴承定位，使阀门的开启更加轻便、省力；在整个阀门中采用多重密封结构，保证了阀门的零泄漏；而阀板与阀座之间的密封部位采用堆焊合金粉末，使之具有耐磨损，寿命长的优点。
图1为本发明的结构示意图；
图2为本发明中阀体和左、右连接管连接的结构示意图。
下面结合附图对本发明作出详细的说明。
如图1和图2所示，本发明提供了一种闸阀，包括具有三通结构的阀体1，阀体1的上端通过阀口连接有阀盖2，阀盖2上设有通孔，阀杆3通过通孔穿入阀体1内，且阀杆3的上端垂直连接有手轮4，其下端连接有控制开闭的阀板5，阀体1内卡装有填料函6，且阀盖2压紧在填料函6上，阀盖2的顶端连接有阀杆螺母7，阀盖2内且与阀杆螺母7之间设有定位套8，定位套8内设有若干推力球轴承，定位套8的上端设有用于锁紧的螺塞9，阀体的下端左、右相对设置的开口内分别插装左、右连接管10，左连接管和右连接管靠近阀板的内端上均设有阀座，左连接管和右连接管的外圆周面分别与阀体的下端左、右侧面焊接固定。
阀板5和阀杆3通过燕尾槽卡装连接，且阀盖2与阀体1通过螺纹连
接的方式安装连接。
左、右连接管的外圆周面均分别设置成内小外大的台阶状，其小直径部的外圆周面上设有用于与阀体连接的螺纹。
阀座11与左、右连接管10采用间隙配合连接，且左、右连接管10与阀座11之间设有起密封作用的第一密封槽12，第一密封槽12内设有若干O型密封圈。
填料函6与阀杆3之间以及填料函6与阀体1之间设有第二密封槽13，第二密封槽13内设有若干O型密封圈。
阀杆3螺母的上端设有指示罩14，指示罩14上设有起指示作用的标牌15，且阀杆3的上端连接有指示针16。
本发明还提供了一种制作上述闸阀的工艺方法，本方法采用分解式加工工艺，包括如下步骤：
步骤1、分别制作阀体1和左、右连接管10；
步骤2、在左、右连接管10的内侧通过间隙配合的方式设置阀座11，并通过设置O型密封圈进行密封；
步骤3、将阀体1和左、右连接管10通过螺纹连接，并通过定位台阶定位，在阀体1与左、右连接管10组装后的外接触面上进行焊接处理；
步骤4、将阀杆3和阀板5通过燕尾槽连接，自上而下穿过阀座11，进入阀体1内；
步骤5、将填料函6卡装在阀体1内，阀杆3与填料函6采用间隙配合安装，并通过O型密封圈进行填料函6与阀杆3以及填料函6与阀体1的密封；
步骤6、将阀盖2与阀体1通过螺纹连接，至阀盖2压紧在填料函6上,并用螺母将阀盖锁紧在阀体上；
步骤7、在阀盖2与阀杆螺母7之间设置推力球轴承以实现减小扭矩作用，并通过在推力球轴承的上方压紧螺塞9将其锁紧；
步骤8、在阀盖2侧面旋入开槽锥端紧定螺钉17至螺塞9，从而将螺塞9锁紧固定在阀盖2上；
步骤9、在阀杆螺母7的上端设置用于控制阀板开闭的手轮4，且手轮4与阀杆螺母7通过平键18连接；
步骤10、在阀杆螺母7的上端设置指示罩14，且将指示针16通过螺纹连接设置在阀杆3的上端，并用螺母锁紧。
其中，在步骤1中，阀体的加工工艺步骤如下：
锻造阀体毛坯件；
进行正火、回火等热处理工艺；
检验经过热处理后的阀体毛坯件是否满足强度、硬度等使用要求；
通过机加工等机械加工方式，将阀体毛坯件结构长度(面对面)的尺寸公差控制在0～+0.05mm，并保证对称度，得到符合使用要求的阀体。
在步骤1中，左、右连接管的加工工艺步骤如下：
锻造左、右连接管毛坯件；
进行正火、回火等热处理工艺；
检验经过热处理后的左、右连接管毛坯件是否满足强度、硬度等使用要求；
通过机加工等机械加工方式，将左、右连接管毛坯件螺纹端面到定位台阶端面的尺寸公差控制在0～-0.02mm，得到符合使用要求的左、右连接管。
在步骤3中，阀体与左、右连接管的焊接工艺要求如下：采用二氧化碳气体保护焊进行焊接；焊接时，焊接电流控制在150～180A，焊接电压控制在18V,气体流速控制在18～20L/min，焊后进行时效处理。
本发明，采用分解式加工的方式，将阀体、左、右连接管和阀杆等闸阀中的部件分别加工出来，然后进行组装，这种结构及其工艺方法，在闸阀加工的过程中无需再使用专用夹具，降低了劳动强度，提高了产品精度
及合格率，也减少了机加工的时间；同时，在阀杆螺母中采用推力球轴承的双轴承定位，使阀门的开启更加轻便、省力；在整个阀门中采用多重密封结构，保证了阀门的零泄漏；而阀板与阀座之间的密封部位采用堆焊合金粉末，具有耐磨损，寿命长的优点。
本发明不局限于上述最佳实施方式，任何人应该得知在本发明的启示下作出的结构变化，凡是与本发明具有相同或相近的技术方案，均落入本发明的保护范围之内。
Claims (10)
- 闸阀，包括具有三通结构的阀体，其特征在于，所述阀体的上端开口处连接有阀盖，所述阀盖上设有通孔，阀杆通过所述通孔穿入所述阀体内，且所述阀杆的上端垂直连接有手轮，其下端连接有控制开闭的阀板，所述阀体内卡装有填料函，且所述阀盖压紧在所述填料函上，所述阀盖的顶端连接有阀杆螺母，所述阀盖内且与所述阀杆螺母之间设有定位套，所述定位套内设有若干推力球轴承，所述定位套的上端设有用于锁紧的螺塞，所述阀体的下端左、右相对设置的开口内分别插装左连接管和右连接管，所述左连接管和所述右连接管靠近所述阀板的内端上均设有阀座，所述左连接管和所述右连接管的外圆周面分别与所述阀体的下端左、右侧面焊接固定。
- 如权利要求1所述的闸阀，其特征在于，所述阀板和所述阀杆通过燕尾槽卡装连接，且所述阀盖与所述阀体通过螺纹连接的方式安装连接。
- 如权利要求1所述的闸阀，其特征在于，所述左、右连接管的外圆周面均分别设置成内小外大的台阶状，其小直径部的外圆周面上设有用于与所述阀体连接的螺纹。
- 如权利要求1所述的闸阀，其特征在于，所述阀座与所述左、右连接管采用间隙配合连接，且所述左、右连接管与对应的所述阀座之间设有起密封作用的第一密封槽，所述第一密封槽内设有若干O型密封圈。
- 如权利要求4所述的闸阀，其特征在于，所述填料函与所述阀杆之间以及所述填料函与所述阀体之间设有第二密封槽，所述第二密封槽内设有若干O型密封圈。
- 如权利要求1所述的闸阀，其特征在于，所述阀杆螺母的上端设有指示罩，所述指示罩上设有起指示作用的标牌，且所述阀杆的上端连接有指示针。
- 制作如权利要求1～6项任一项所述的闸阀的工艺方法，其特征在 于，采用分解式加工工艺，包括如下步骤：步骤1、分别制作阀体和左、右连接管；步骤2、在左、右连接管的内侧通过间隙配合的方式设置阀座，并通过设置O型密封圈进行密封；步骤3、将阀体和左、右连接管通过螺纹连接，并通过定位台阶定位，在阀体与左、右连接管组装后的外接触面上进行焊接处理；步骤4、将阀杆和阀板通过燕尾槽连接，自上而下穿过阀座，进入阀体内；步骤5、将填料函卡装在阀体内，阀杆与填料函采用间隙配合安装，并通过O型密封圈进行填料函与阀杆以及填料函与阀体的密封；步骤6、将阀盖与阀体通过螺纹连接，至阀盖压紧在填料函上,并用螺母将阀盖锁紧在阀体上；步骤7、在阀盖与阀杆螺母之间设置推力球轴承，并通过在推力球轴承的上方设置螺塞将其锁紧；步骤8、在阀盖侧面旋入开槽锥端紧定螺钉至螺塞，从而将螺塞锁紧固定在阀盖上；步骤9、在阀杆螺母的上端设置用于控制阀板开闭的手轮，且手轮与阀杆螺母通过平键连接；步骤10、在阀杆螺母的上端设置指示罩，且将指示针通过螺纹连接设置在阀杆的上端，并用螺母锁紧。
- 如权利要求7所述的闸阀的制作工艺，其特征在于，在步骤1中，阀体的加工工艺步骤如下：锻造阀体毛坯件；进行正火、回火等热处理工艺；检验经过热处理后的阀体毛坯件是否满足强度、硬度等使用要求；通过机加工等机械加工方式，将阀体毛坯件结构长度(面对面)的尺寸 公差控制在0～+0.05mm，并保证对称度，得到符合使用要求的阀体。
- 如权利要求7所述的闸阀的制作工艺，其特征在于，在步骤1中，左、右连接管的加工工艺步骤如下：锻造左、右连接管毛坯件；进行正火、回火等热处理工艺；检验经过热处理后的左、右连接管毛坯件是否满足强度、硬度等使用要求；通过机加工等机械加工方式，将左、右连接管毛坯件螺纹端面至定位台阶端面的尺寸公差控制在0～-0.02mm，得到符合使用要求的左、右连接管。
- 如权利要求7所述的闸阀的制作工艺，其特征在于，在步骤3中，阀体与左、右连接管的焊接工艺要求如下：采用二氧化碳气体保护焊进行焊接；焊接时，焊接电流控制在150～180A，焊接电压控制在18V,气体流速控制在18～20L/min，焊后进行时效处理。
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