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Talking about the welding technology of neck flange

  • Time of issue:2021-08-13

Talking about the welding technology of neck flange

(Summary description)　　

The neck height of the neck flange is low, which c'an improve the rigidity and load-bearing capacity of the flange. Compar‍ed with the butt-welded flange, the welding workload÷ is large, the electrode consumption is high, and it cannot withstan♥d high temperature and high pressure, repeated bending and temperature fluctuations, but the oσn-site device is more convenient, and the process of welding seam scratching can be• omitted, which is more popular. Butt welding flange with neck: neck flange welding is usual₩ly called "high hub" flange.

Its purpose is to transfer the pressure of the pipeline, thereby reducing the high stre♦ss concentration in the flange base. Neck flange welding is a good design for ≤butt welding those flanges that are provided due to their own constructive value. However, the∏ price is relatively high because of the complicated production process of™ the product. Threaded (threaded) flange: The threaded flange is conσnected by threaded fasteners. But the center of the product has a thr✘ead size corresponding to the pipe. Its main advantage i‍s that it can be assembled without welding.

Sliding flange: Sliding flange has a lower hub, because the pipe enters the sing<le flange before welding. This is to provide sufficient strength ins§ide and outside the welding to avoid leakage. Sliding flanges are matched with bor↔ing pipes with slightly larger outer diameters. They are better than neck flange welding d↔ue to lower initial cost.

flange

Many users, but the cost of the latter device will not be low, due to t☆he increase in the number of weld neck flanges, lap flange: in practi↓ce, the lap flange is the same complete sliding flange, unless it is in the hole a>nd A radius between flange races. It is necessary for the radius to have the flange to contain ✘the lap stub to complete. Usually, the lap flange and the lap stub end mating together‍ will assemble the system.

The socket welding flange is a similar sliding flange, unless it has a ho₩le and a counter hole size. The matching of the counter hole and the pipe allows the pipe to be ♥inserted into a sliding flange similar to the flange. The diameter of the s♠maller hole is matched with the same pipe with the sa÷me ID. The restriction is a built-in hole that stays at the bottom as a shoulder sl∑eeve designed for pipes. This eliminates any flow restrictions↕ when using socket welding flanges.

  • Time of issue:2021-08-13
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Information

　　

The neck height of the neck flange is low, which can improve the rigidity and load-bear≠ing capacity of the flange. Compared with the butt-welded flange, the welding workload is large,$ the electrode consumption is high, and it cannot withstand high temperature and high pressureα, repeated bending and temperature fluctuations, but the on-site device i↔s more convenient, and the process of welding seam scra÷tching can be omitted, which is more popular. Butt welding flange with neck: neck flaεnge welding is usually called "high hub" flange.

Its purpose is to transfer the pressure of the pip₩eline, thereby reducing the high stress concentrat>ion in the flange base. Neck flange welding is a good de→sign for butt welding those flanges that are provided due to their own ¶constructive value. However, the price is relatively higβh because of the complicated production process of the product. Threaded (threaded) fla nge: The threaded flange is connected by threaded  fasteners. But the center of the product has a thread size  corresponding to the pipe. Its main advantage is that it can be assembled ±without welding.

Sliding flange: Sliding flange has a lower hub, because the p ipe enters the single flange before welding. This is to  provide sufficient strength inside and outside the welding to avoid↓ leakage. Sliding flanges are matched with boring pipes with slightly larger ou↕ter diameters. They are better than neck flange welding due to lower init$ial cost.

flange

Many users, but the cost of the latter device will not be low, due αto the increase in the number of weld neck flanges, lap fla∑nge: in practice, the lap flange is the same complete sliding flange, unless it is in the ho↕le and A radius between flange races. It is necessary for the radius to have the flange to 'contain the lap stub to complete. Usually, the lap ₩flange and the lap stub end mating together will assemble the system.

The socket welding flange is a similar sliding flange, unless it has a hole and aε counter hole size. The matching of the counter hole and th®e pipe allows the pipe to be inserted into a sliding flange similar to the flange. The diamete÷r of the smaller hole is matched with the same pipe with the sam±e ID. The restriction is a built-in hole that stays at the bottom as a shoulder> sleeve designed for pipes. This eliminates any flow restrictions when using socket w∞elding flanges.

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　　 The neck height of the neck flange is low, which can improve the rigidity and loa d-bearing capacity of the flange. Compared with the butt-w✔elded flange, the welding workload is large, the electrode consumption is high, and it can×not withstand high temperature and high pressure, repeated bending and temperature§ fluctuations, but the on-site device is more convenient, and the process of welding seam scrat↕ching can be omitted, which is more popular. Butt welding flange with neck: neck fla>nge welding is usually called "high hub" flange. Its purpose is to tra≥nsfer the pressure of the pipeline, thereby reducing th±e high stress concentration in the flange base. Neck flange welding is a good desig★n for butt welding those flanges that are provided due to their own construcπtive value. However, the price is relatively high because of the complicated pro"duction process of the product. Threaded (threaded) flange: The threaded flange is connect♣ed by threaded fasteners. But the center of the product has a thread size corresponding to the★ pipe. Its main advantage is that it can be assembled without welding. Sliding flanδge: Sliding flange has a lower hub, because the pipe enters the single flange before w←elding. This is to provide sufficient strength inside and outside th↔e welding to avoid leakage. Sliding flanges are matched with boring pipes Ωwith slightly larger outer diameters. They are better than neck flange welding due to lower βinitial cost. flange Many users, but the cost of the latter device will not be low, due♥ to the increase in the number of weld neck flanges, lap flange: in practice, the lap flange isπ the same complete sliding flange, unless it is in the hole and A radius between flange£ races. It is necessary for the radius to have the flange to contain the lap stub to complete. U♥sually, the lap flange and the lap stub end mating together will assemble the sys≈tem. The socket welding flange is a similar sliding flange, uσnless it has a hole and a counter hole size. The matching of the counter hole and the pipe a₩llows the pipe to be inserted into a sliding flange similar to the flange. The diameter of the smal→ler hole is matched with the same pipe with the same ID. The restriction is a built-in hole that ¥stays at the bottom as a shoulder sleeve designed for pipes. This eliminates any flow restrictio↑ns when using socket welding flanges.
Advantages of flat welding flange [ 2021-08-13 ]
　　1. In order to compact the sealing surface of the flat welding flange, only a small pressure δis required. As the required pressure drops, the size of the bolts and the number required are₽ correspondingly reduced. After all, a plan is planned. A flat we€lding flange product with a relatively small volum∞e and a relatively light weight. 　　 2. The production of flat welded flanges c↕an save data and reduce costs. When the raw material of the pipe is s↓pecial and the price is high, the cost of welding the flange of the same raw materia♥l will be high, and the use of this flange can effectively save the cost of materials." Conducive to construction, when connecting, the bolt holes of§ the flange are inconvenient to align or to avoid replacing the flange bolt holes of the eq€uipment, etc., the use of this flat welded flange is very suitable. ↓        3. The flat welding flange can save space and reduce weight in the process of use. Th★e most important thing is to ensure that the head part will not le←ak. It has a very outstanding sealing function. The reason why the size of the compact βflange is reduced is because The diameter of the seal is ☆reduced, which will reduce the cross-section of the sealing ‌surface. Also, the flange gasket has now been replaced by a sealing ring to en♦sure an outstanding matching of the flat welded fl>ange seal facing the sealing surface. 　　 flat welding flange 　　 But it also has some disad♠vantages: 　　 Disadvantages of flat welding flange: 　　The main design disadvant↓age of flat welded flanges is that it cannot ensure no leakage. This is the lack♣ of its planning: the connection is dynamic, and for example, thermal expansion and™ fluctuating cyclic loads will cause movement between the flange surfaceδs, which will affect the function of the flange, which will damag↑e the integrity of the flange and eventually lead to leakage.‌ It is impossible for any product to be without shortcomings, just try to control t≈he lack of products to the minimum, so the company tries to perfect the functio✘ns of the products when producing flat welded flanges to make them play the gre atest role.
      Flange work characteristics: 　　Flange work characteristics: 　　 1. A self-cont∑rol butterfly valve that can be remotely controlled, which also ₩has the characteristics of a flanged butterfly valve, and can be equipped with a w≠ide range of butterfly valves; 　　2. The power supply 'is the driving energy of the butterfly valve, with a wide range of power sources, wid♥e application range, saving human resources, and having work efficiency; 　　3. Conve nient operation and easy to meet various control requirements. It≤ can be realized by selecting different actuators, signal αfeedback, flow adjustment, explosion-proof and other functions; 　　4. U♦ltra-miniaturization can be realized, mechanical self-locking can be realized, and diff×erent sealing rings can be changed to meet different working conditions. 　　Th‌e working principle of flange: 　　Using the actuator to ≈input a standard signal of 0-10 mA, the motor group drives the gear, worm, and torque to dri​ve the disc to rotate. When the valve is in the fully open position, the thickness ofβ the butterfly plate is the resistance of the medium flowing through the valve body₽, so the pressure drop generated by the valve is small, so it has better flow control ch¶aracteristics. 　　Butterfly valve has two sealing types: elastic seal and metal seal. For elaΩstic sealing valves, the sealing ring can be embedded on the valve body or attached to the peri'phery of the butterfly plate. The valve with metal seal generally ∑has a longer life than the valve with elastic seal↓, but it is difficult to achieve a complete seal. Metal seals can ad↔apt to higher operating temperatures, while elastic seals have the defect of te↔mperature limitation. If flanged butterfly valves are required to be used as© flow control, the main thing is to correctly select the size and t♥ype of the valve.
　The valve is an accessory of the pipeline, used to control the™ flow, pressure, and direction of the fluid. The fluid to be controlled can ≤be liquid, gas, gas-liquid mixture or solid-liquid mixture.   one. Ba×sic parameters of valve 　　The basic parameters of the valve include working pressure (PN≥), working temperature (T) and nominal diameter (DN). For various valεves equipped on pipelines, nominal pressure and nominal diameter are₽ commonly used as basic parameters. Nominal pressure refers to t he maximum working pressure that a valve of a certain material can withstan€d at a specified temperature. The nominal diameter refers to the nominal →inner diameter of the connecting end of the valve body₹ and the pipeline. Valves, pipelines and pipeline accessories of the same nominal diameter ca♥n be connected to each other, which is interchangeable.©   two. Valve classification 　　 1. According to function and purpose 　　 According to the difαferent functions of the valve, it can be divided into the following five ♣types: 　　①Shutoff valve 　　 shut-off valve is also called closed-circuit valve, its fun★ction is to connect or cut off the medium in the pipeline. Block valves include gate v$alves, globe valves, plug valves, ball valves, butterfly valves, and diaph​ragm valves. 　　②Check valve 　　 Check valve is also called one-way valve o<r check valve, its function is to prevent the back flow of the medi€um in the pipeline. For example, the suction valve of the water pump belong↑s to the non-return valve category. 　　③Safety valve 　　 The role of safety <valves is to prevent the pressure of the medium in the pipeline or device from e✔xceeding the specified value to protect the safe operation of subsequent equipment. 　　④Regulating  valve 　　The function of the regulating valve is to regulate the ÷pressure, flow and other parameters of the medium.ε The regulating valve has different classification methods. According to the purpose and funct£ion, the regulating valve can be divided into: 　　 (1) Two-positiπon valve. The two-position valve is mainly used to close or con‍nect the medium. 　　 (2) Regulating valve. The regu×lating valve is mainly used for regulating the coefficient. When selecting the αvalve, the flow characteristics of the regulating valve need to be determined; the regulating valveσ can be divided into the following forms according to the structure: single-seat regulat≠ing valve; double-seat regulating valve; sleeve regu"lating valve; angle regulating Valve; three-way regulating valve; diaphragm valve; butterfly val<ve; ball valve; eccentric rotary valve. 　　 (3) Shut-off valve. Usually refers to a v≠alve with a leakage rate of less than one part in 100,000. 　　⑤Divert valve 　　 The diverter valve ™includes various distribution valves and flow valves, e÷tc., whose function is to distribute, separate or mix the medium in the pipeline. 　　2. AccoΩrding to the valve drive mode 　　According to the valve drive mode,  it can be divided into the following three types: 　　①↔Automatic valve 　　 refers to valves that do not require external dri&ve, but rely on the energy of the medium to actuate the valve, such as safety valves, pressure re&ducing valves, traps, check valves, automatic cont£rol valves, etc. 　　②Power driven valve 　　The pow↔er-driven valve can be driven by various power sources. Including electric valves driven by electri city, pneumatic valves driven by compressed air, hydraulic valves driven by hydraulic pressure such✘ as oil, and combinations of various driving methods, such as pneumatic-electric valveπs. 　　③Manual valve 　　Manual valves use handwheels, handles, levers, sprockets anαd other components to manipulate the valve action by manpower.™ When the valve closing torque is large, a gear or turbo reducer can be set between the han♠dwheel and the valve stem. If necessary, universal joints and driv‍e shafts can also be used for long-distance operation. 　　3. Press the connection metho≥d 　　 can be divided into the following six types according to the connection method: 　　ε①Threaded connection valve: The valve body has an internal thrφead or an external thread to connect with the pipe thread; 　　②Flange connection valve: the valve ₽body has a flange to connect with the pipeline flange; 　　③Welding connection valve: The valve bπody has a welding groove and is welded to the pipeline; 　　④Clamp-c♠onnected valve: the valve body has a clamp to connect with the pi♥pe clamp; 　　⑤ Card sleeve connection valve: It is connected with the pipeline by a card sleeεve; 　　⑥Wafer connection valve: a connection form in which the valve and ↕the two pipes are directly clamped together with bo lts. 　　4. According to the valve body material 　　≠①Metal material valve 　　The valve body and other parts are made of metal ©materials, such as cast iron valves, carbon steel valves, alloy steel$ valves, copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy val™ves, Monel alloy valves, etc. 　　②Non-metallic valve 　　The valve body and other  parts are m
The caliper can also be called a brake cylinder. There  are a lot of pistons inside the caliper. The function of the caliper i s to push the brake pads to clamp the brake disc, so that the ®car can slow down. After the brake pads clamp the brake diαsc, the kinetic energy can be converted into heat energy. The brake system is ‌a vital system in a car. The brake system is related to the≥ driving stability and driving safety factor of the car. The key components of the brake s≠ystem include vacuum booster pump, brake master cylinder, brake cylinder, brake padσs, and brake discs. Brake pads and brake discs are basically wearing part↑s that need to be replaced on a regular basis. As the dr★iving distance of the car increases, the brake pads a​nd brake discs will basically continue to wear. After the brake> pads and brake discs are worn to a certain degree, they need to be replaced. If the₹y are not replaced, the braking distance will be affected. After the driver steps on the brake p<edal, the master cylinder can push the brake cylinder through the brake fluid. At this timeπ, the brake cylinder can push the brake pads to clamp the brake disc. The vacuum boo₩ster pump provides power assistance, and the vacuum booster← pump allows the driver to easily step on the brake pedal. Tγhe brake fluid in the brake system needs to be replaced regularly. If it ∞is not replaced for a long time, it will affect the braking f∑orce and braking distance. Brake fluid is a kind of fluid that is easier to absorb water. Whe∞n the water content of the brake fluid reaches 3%, it needs to be replace d. After replacing the brake fluid, the air in the brake system ∞pipeline needs to be emptied, otherwise the braking force and braking distance σmay also be affected.
　　 We have seen many products using gears in our lives, but do you know what p​rinciple they use gears? According to its working principle, ​　　 gear has the following functions: First, gears can transmit mechanical power, such as au♥tomobile gear shifting devices, industrial gearboxes, etc.; second, g≥ears can change the direction of movement, such as mechanical watches, shaking head devices •in electric fans, etc.; third, gears can reduce speed and✔ Improve torque, such as motor reducer, various speed change mechanisms, etc. 　　Gear t→ransmission mechanism 　　 Here are two interesting applications of gears in automobiles an¥d aviation, let's take a look at the role of gears in them. ‍ 　　 There is a mechanical structure in a car called a differential, which is an extremely import£ant part. When a car turns, the speeds of the inner and outer wheels are different. If there is₩ no differential, the speeds of the inner and outer wheels are the same. The w<heels slip and roll over. Moreover, the speed of the car is very fast, and iλt is absolutely impossible to have no differential at γhigh speeds. The gear here is on the differential, whichπ can not only transmit the power of the engine, but als✘o reduce the speed through the different speed ratios of the gear device, an↔d at the same time can achieve a very cool "differenti™al" function. 　　 three-dimensional model of differential 　　In aviation, helicopters using coax¥ial reversal technology are favored by many countries because of theεir excellent performance. This helicopter has two pro<pellers on the same shaft. When the plane is flying, the rotation dir₹ection of the two propellers must be opposite to ensure the power balance of the plane↔. 　　Helicopter using coaxial reversal technology 　　 From the three-dimensional mode∏l of the coaxial reversal structure, it can be seen that after two transfo rmations of the gear, the mechanical transmission direction is smooth∞ly changed, and two different rotation directions are realiz♠ed on the same shaft.
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