Abstract: This articlescrap designed a valve which has two spool. It can use in oil well wellhead, flowmeters and pipe network's flow. We design two valve chamber side by side in structure. With the help of lower left stem which has a spring outside, it can ensure that the direction of the switch is changed with the direction of the fluid pressure in the pipeline, this realizes the normal flow of well fluid and the co ntrol of well liquid backflow. The design of the valve seat can effectively replace the damage of the spool, it also make the replacement easily.., we improve the existing valve in many aspect such as the narrow inner passage, the limited flow, the preventing of the back flow and the high cost of replacing parts.
Key words: valve; double core; backflow proof
CLC number: U641.3 + 3 Document code: A Article ID: 1006-4311 (2017) 24-0104-02
0 Introduction Valve is widely used in petroleum, chemical, metallurgy, electric power, textile, light industry, machinery manufacturing, construction and national defense and other national defense departments, has become an indispensable control device for a variety of fluid devices. Many different valve specifications, respectively, play a different role, such as on, off, regulation, safety protection, energy saving and hydrophobic, is a large amount of products. Valve failure [1-12] mode is stuck [13], leakage and vibration should be studied in depth to find ways to improve reliability.
In order to solve the problems of oil well wellhead, metering chamber, narrow flow passage and limited flow in well pipe flow in the existing oilfields, inability to prevent backflow of well fluid, complicated process of replacing parts, high cost and so on, Channel to increase the flow rate; to prevent the flow of oil backflow phenomenon; design spool shape, enhance spool strength [14]; to achieve flexible replacement of parts within the valve after damage, reduce maintenance costs; design spool protection measures to reduce spool scratches ; Improve on-site operation efficiency and reliability.
The article innovatively designed a double-core integrated valve to solve the following problems existing in the field of valves currently used: ① Because the valve is provided with two upper and lower spools, resulting in narrowing of the inner passage and limited flow; ② There is no design Well fluid anti-backflow mechanism, it can not stop the well fluid backwards; ③ the bottom of the ball valve due to long-term switch easy to break; ④ can only achieve the upper gate valve components on-site replacement of the target, and the bottom of the ball valve components if damaged, the need to replace the entire valve ; ⑤ valve spool in use, due to the existence of welding slag and hard impurities in the pipeline will be scratched, and repair replacement spool, on the one hand the high cost, on the other hand the replacement operation is also very cumbersome.
1 Structure Design 1.1 The overall structure of the design of the main body of the valve body is square, the valve body is set on the left and right two cylindrical valve chamber, two valve chamber side by side and set between the two communicating through-hole, the bottom of each valve chamber Set the sealing seat, each valve chamber equipped with open and close channel of the spool assembly.
1.2 right valve cavity design Right valve cover and the right valve cavity seal threaded connection, the right valve cover and the right stem seal threaded connection, the right end of the valve stem fixed right spool, the right spool sits on the bottom of the right valve cavity seal seat When the two constitute a sealing pair.
The structure of the left valve chamber is different from that of the right valve cover in that the left valve stem is divided into upper and lower segments, the left valve stem is a screw rod and is connected with the central screw hole of the left valve cover, the lower left shaft rod is a polished rod, and the upper end thereof is inserted To the left bonnet screw hole, the lower end is fixedly connected to the left spool, the left spool sitting on the bottom of the left valve cavity sealing seat between the two constitute a sealing pair, the lower left of the stem is also covered with a spring. When the spring is compressed by the upward pressure transmitted by the left valve core, the left valve cavity opens, and when the left valve stem is rotated by the upper left valve rod and the left valve core is seated on the sealing seat of the left valve cavity or the spring is pressed downward When the force, the left valve chamber closed.
1.4 Compression sleeve and seat structure design In each valve cavity set pressure sleeve and seat, the pressure sleeve is annular, the outer diameter of which corresponds to the inner diameter of the cavity, the inner diameter greater than or equal to the outer diameter of the corresponding spool, A plurality of through holes are circumferentially distributed on the outer wall of the valve seat; the upper end surface of the valve seat is in sealing engagement with the lower end surface of the pressure sleeve, the upper mouth of the valve seat is provided with a sealing bevel, and when the corresponding valve core is seated on the upper opening of the valve seat, The sides of the cores are mutually bonded to form a sealing pair, a sealing pair is formed between the lower portion of the valve seat and the sealing seat of the valve cavity where the valve seat is located, and a through hole is arranged in the center of the valve seat.
2 Calculation of Main Parameters 2.1 Calculation of Minimum Path 4 Innovative Points and Project Features Anti-backflow double-core integrated valve designed to effectively prevent backflow of well fluid and the valve core can be effectively protected. If damaged, there is no need to change the original process flow at the scene You can achieve replacement parts, to fill the current part of the replacement parts can only be blank, designed to be more perfect, more powerful function. Innovation is mainly reflected in the following aspects.
① The left stem consists of upper and lower sections, and the lower left stem has a spring jacket to ensure that the lower left stem can generate corresponding upward and downward movements along with the direction of the fluid pressure in the pipeline during use. Thus driving the left valve core to open or close the left valve cavity channel so as to achieve the purpose that the well fluid normal flow and the well fluid backflow can be controlled. ② seat design, which can effectively prevent the valve core damage during use, replaced by the valve seat on behalf of the damage, and the valve seat cost much lower than the valve core, less time to replace, the operation is also a lot easier, so the design The valve is more practical in the actual production.
③ When replacing the valve seat, if the left valve seat is damaged, the right valve chamber will be completely closed. If the right valve seat is damaged, the left valve chamber will be closed completely. Both of them meet the purpose of convenient construction on site.
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