Two-way magnetic buffer type magnetic control pre-tightening vacuum zone gas replenishment device

Abstract

This invention discloses a bidirectional magnetic buffer type magnetically controlled pre-tightening vacuum zone gas replenishment device. A buffer cylinder is fixed to the center of a valve tube using four reinforcing ribs. Inside the buffer cylinder are a bushing seat with a bushing, a central plate with an adjusting magnet, and a protective tube with flanges at both ends. A control ring is attached below the adjusting magnet. The lower end of a connecting shaft with a conical ring cap and a buffer piston is inserted into the lower end of the protective tube via the bushing, central plate, adjusting magnet, and control ring. The buffer piston has an vent hole, a connecting cavity, and a conical ring opening. The buffer piston is fixed to the connecting shaft with a pin, and the conical ring cap has an exhaust hole. A movable magnet is fixed to the connecting shaft via a movable plate, and the buffer magnet is fixed to the bottom of the protective tube via a bottom cover. An upper cover with a guide ring platform is fixed to the upper end of the buffer cylinder, and a conical valve plate is fixed to the main valve shaft with bolts. A valve seat with a conical valve opening is first fixed to the valve tube, and then fixed to the gas replenishment branch pipe. This invention will be widely applied in the field of breaking vacuum zones in water turbines.

Description

TECHNICAL FIELD

[0001] The present application is a device for supplying air to the vacuum zone generated during the operation of a water turbine. BACKGROUND

[0002] At present, the devices for destroying the huge vacuum zone generated during the shutdown of a water turbine and for supplying air to the vacuum zone generated during the operation of a water turbine in the prior art all use compressed springs to provide pre-tightening force to the valve disc, and the pre-tightening force controls the initial vacuum degree of the air supply device in the prior art. The water turbine requires that air should be supplied to the vacuum zone generated by the water turbine only when the vacuum degree of the vacuum zone reaches a certain value. The vacuum degree during the air supply process should be no greater than the initial vacuum degree, and the stroke of the valve disc during the air supply should not cause the vacuum degree to increase. However, the air supply device in the prior art that uses a spring to control the initial vacuum degree cannot meet these technical requirements. The greater the amount of air supplied to the vacuum zone, the greater the stroke of the valve disc, and the greater the distance of the compressed spring of the valve disc. The force of the compressed spring of the valve disc is the vacuum degree of the vacuum zone acting on the valve disc, that is, the product of the area of the valve disc and the vacuum degree is the pressure applied by the valve disc to the spring. The area of the valve disc is constant, and only the increase of the vacuum degree can increase the pressure of the compressed spring of the valve disc, thereby increasing the air supply stroke of the valve disc. Only by increasing the air supply stroke can a large amount of air be supplied to the vacuum zone. However, at this time, the vacuum degree is much greater than the initial vacuum degree required by the water turbine, which will cause irreversible damage to the water turbine. Therefore, the air supply device in the prior art that uses a spring cannot meet the technical requirements of the water turbine for air supply to the vacuum zone. In addition, the buffer structure used in the air supply device in the prior art basically has two types. One type uses oil as the buffer medium. The damping pressure generated during the buffer process causes the oil to leak out in a short time, the buffer effect is lost, a large rebound impact is generated, the valve shaft is often broken, and accidents such as flooding of the generator are caused. The other type uses compressed air buffer. This technical solution not only has a particularly complex structure, but also often fails, resulting in a large amount of maintenance work. At present, there is an urgent need for a device that can increase the stroke of the valve disc during the entire air supply process without causing the vacuum degree of the vacuum zone to increase, so that a large amount of air can be supplied to the vacuum zone at the set initial vacuum degree. The vacuum degree formed in the vacuum zone during the entire air supply process should be no greater than the set initial vacuum degree, but can be slightly less than the set initial vacuum degree. At the same time, a buffer solution with reliable performance, simple structure and good technical effect is needed to reduce the workload of frequent maintenance of the buffer unit by the users, and to increase the safe operation level and economic benefits of the hydropower plant. SUMMARY

[0003] The technical scheme provided by the application fully satisfies the requirement of supplementing a large amount of air into the vacuum area generated when the water turbine is in emergency shutdown and the vacuum area generated when the water turbine is in operation. The main technical features are as follows: four rib plates are used to fix the buffer cylinder with uniformly distributed screw holes at the upper and lower ends in the center of the valve pipe with a mounting flange on the upper end; the shaft sleeve protection pipe with the shaft sleeve seat at the lower end, the shaft sleeve in the middle and the gland with the through hole fixed at the upper end is placed in the lower end of the buffer cylinder, the adjusting magnet is fixed on the lower surface of the middle disc by means of a countersunk bolt, and the control ring is pasted on the lower surface of the adjusting magnet by means of glue; the protection pipe, the middle disc and the shaft sleeve seat are fixed on the lower end of the buffer cylinder by means of bolts through the flange hole on the flange of the upper end of the protection pipe, the flange hole on the middle disc, the flange hole on the shaft sleeve seat and the uniformly distributed screw holes on the lower end of the buffer cylinder; the conical ring cover with 4-6 exhaust holes is sleeved on the connecting shaft below the main valve shaft through the movable guide hole, the buffer piston with 4-6 air holes, a conical ring opening and a communication cavity is fixed on the connecting shaft below the conical ring cover, the other end of the connecting shaft with the buffer piston is placed into the protection pipe through the through hole on the gland, the shaft sleeve, the through hole on the shaft sleeve seat, the through hole on the middle disc and the magnet through hole on the adjusting magnet, the moving magnet with the magnet through hole is fixed on the moving disc with a central counterbore, the moving disc is sleeved on the end of the connecting shaft through the magnet through hole and is fixed on the end of the connecting shaft by means of an internal hexagonal bolt and the central counterbore, the distance between the lower surface of the adjusting magnet and the upper surface of the moving magnet is c+(1-5)mm, the buffer magnet is fixed on the bottom cover, and then the bottom cover is fixed on the lower end of the protection pipe; the upper cover is sleeved on the main valve shaft through the main shaft guide hole on the guide ring table and is fixed on the upper end of the buffer cylinder by means of a bolt, the distance between the lower surface of the upper cover and the upper surface of the buffer piston is 5-10mm; the conical valve disc is fixed on the upper end of the main valve shaft by means of a bolt, the valve port seat with the conical valve port is concentrically fixed on the upper end of the valve pipe, and then the valve port seat and the valve pipe are fixed on the air supplement branch pipe by means of bolts through the flange hole on the valve port seat, the flange hole on the mounting flange and the uniformly distributed screw holes on the fixing flange.

[0004] The main valve shaft can slide in the main shaft guide hole without clearance, the conical ring cover with exhaust holes can slide freely on the connecting shaft through the movable guide hole, the lower surface of the conical ring cover and the upper surface of the buffer piston form a communication cavity, 4-6 exhaust holes are communicated with the air passage through the communication cavity, b is the air compression distance of the buffer ring cavity, the compression distance b is slightly smaller than c+(1-5)mm, c is the minimum control distance between the adjusting magnet and the moving magnet, the pre-tightening distance of the moving magnet and the adjusting magnet to the conical valve disc is greater than c+(1-5)mm, the magnetic attraction generated by the N pole of the adjusting magnet and the S pole of the moving magnet is the pre-tightening force generated by the conical valve disc and the conical valve port, and the pre-tightening force is equal to the downward suction force of the moving part sleeve weight and the vacuum degree in the vacuum area acting on the conical valve disc; the moving part sleeve weight is the sum of the weights of the conical valve disc, the main valve shaft and the connecting shaft, the buffer piston, the conical ring cover, the moving magnet and the moving disc; the downward suction force of the vacuum degree on the conical valve disc is equal to the product of the vacuum degree in the formed vacuum area and the effective area of the conical valve disc. The pre-tightening force generated by the attraction of the adjusting magnet and the moving magnet can be adjusted by adjusting the distance between the adjusting magnet and the moving magnet to be the same as the sum of the weight of the moving part sleeve and the suction force generated by the vacuum degree. When the conical valve disc is rapidly pulled down by the vacuum degree generated by the water turbine, the moving magnet also moves downward quickly, the distance between the adjusting magnet and the moving magnet becomes farther and farther, and the mutual magnetic attraction becomes smaller and smaller; at the same time, the distance between the N pole of the moving magnet and the N pole of the buffer magnet becomes closer and closer, and the repulsion force generated by the same magnetic poles becomes larger and larger, which not only realizes the technical effect of reducing the downward moving speed of the conical valve disc when it is pulled open by the vacuum, but also prevents the conical valve disc from moving too fast to generate a large moment of inertia, so that the adjusting magnet and the moving magnet are demagnetized, that is, the distance between the two magnets is much larger than H value, which cannot stop the conical valve disc at a controllable position, so that the air supplement device becomes an open air supplement, and the tail water is easy to come up, which has the danger of flooding the generator set, so the buffer magnet completely avoids this situation. The self-lubricating wear-resistant bushing and the main shaft guide hole ensure the good concentricity and perpendicularity of the moving parts and the fixed parts. The conical ring cover on the buffer piston solves the technical effect of air buffering realized by the extremely complex structure in the prior art, and replaces the multiple reverse stop pistons and buffer springs in the prior art to realize the technical effect, which is a creative progress for the scheme in the prior art, which eliminates the frequent failures of the buffer structure in the prior art. More importantly, the adjusting magnet, the moving magnet and the buffer magnet replace the spring in the prior art to provide a starting air supplement pre-tightening force that does not meet the technical requirements, that is, the starting vacuum degree.The magnetic control pre-tightening force does not increase the air supply stroke H of the conical valve disc, thus not increasing the vacuum degree of the vacuum area. The greater the air supply stroke H of the conical valve disc, the greater the distance between the adjusting magnet and the moving magnet, and the smaller the attraction between the two magnets. When the distance between the moving magnet and the adjusting magnet is H, the attraction of the vacuum degree to the conical valve disc is the weight of the moving part sleeve and the attraction that is less than the initial vacuum degree. When the vacuum degree area of the water turbine disappears or the vacuum degree of the vacuum area is far less than the initial vacuum degree, the magnetic attraction generated by the adjusting magnet and the moving magnet will attract the moving part sleeve upward, so that the conical valve disc and the conical valve port are quickly closed under the action of the pre-tightening force.

[0005] The technical effect achieved by the technical scheme provided by the application is as follows: when the hydraulic generator set is operated away from the rated working condition, a huge vacuum zone is generated below the water turbine discharge cone of the hydraulic generator set, which will cause severe vibration of the hydraulic generator set, so when the vacuum zone generated by the water turbine reaches a set value, a large amount of air needs to be supplied to the vacuum zone to reduce the severe vibration of the generator set. The air supply mode is adopted to reduce the vacuum zone so that the vacuum degree of the vacuum zone cannot be greater than the set initial vacuum degree value, thereby avoiding the vibration of the generator set; however, the vacuum degree of the vacuum zone cannot be too small, and a too small vacuum degree will reduce the working efficiency of the water turbine. When the vacuum zone generated by the water turbine reaches the set value, the vacuum degree acts on the effective area of the conical valve disc to generate a downward suction force, and when the sum of the downward suction force and the self-weight of the moving part sleeve is greater than the magnetic attraction force between the adjusting magnet and the moving magnet, the suction force generated by the vacuum degree causes the conical valve disc to open rapidly, and the air supply stroke of the conical valve disc is adjusted automatically according to the amount of air supplied. When the magnetic attraction force between the adjusting magnet and the moving magnet and the self-weight of the moving part sleeve and the downward suction force of the conical valve disc caused by the vacuum degree during air supply are balanced, the conical valve disc is temporarily stopped at the air supply position. When the vacuum zone increases, the vacuum degree also increases, and the conical valve disc continues to move downward to reach a new air supply stroke, and is temporarily balanced at the new air supply stroke position. When the vacuum zone decreases, the vacuum degree also decreases, the downward suction force of the conical valve disc decreases, the magnetic attraction force between the adjusting magnet and the moving magnet causes the conical valve disc to move upward, and when the vacuum zone disappears and the vacuum degree is zero, the magnetic attraction force rapidly causes the conical valve disc and the conical valve port to close, thereby avoiding the tail water from coming up. The vacuum degree generated by the air supply device during air supply is less than the set initial vacuum degree, the greater the air supply stroke of the conical valve disc, the smaller the magnetic attraction force, the magnetic attraction force of the magnet is inversely proportional to the distance, the smaller the magnetic attraction force, the smaller the vacuum degree of the vacuum zone, and when the vacuum degree is less than the set initial vacuum degree, the vacuum zone generated by the water turbine will not cause severe vibration, and there is a certain vacuum zone below the water turbine that will not cause severe vibration of the water turbine. The small vacuum zone can improve the working efficiency of the water turbine. The magnetic attraction force between the adjusting magnet and the moving magnet is used to control the set initial vacuum degree of the air supply device, and the thickness c of the ring can be adjusted and controlled by controlling the thickness c of the ring to be (1-5) millimeters. In the prior art, when the spring is used to control the initial vacuum degree of the air supply device, the distance between the conical valve disc and the spring increases as the air supply stroke increases, the spring force is proportional to the compressed distance, the greater the compressed distance, the greater the upward force of the spring, and the vacuum zone needs to provide a greater vacuum degree to increase the air supply stroke, and a large amount of air meeting the technical requirements needs to be supplied by increasing the air supply stroke. At this time, the vacuum degree generated by the vacuum zone is much greater than the set initial vacuum degree, which will cause severe vibration of the water turbine, so the initial vacuum degree of the air supply device controlled by the spring in the prior art cannot meet the technical requirements of the air supply of the water turbine.

[0006] When the moving magnet moves a distance of H, H is the maximum air supply stroke of the conical valve disc, at this time, the magnetic attraction force generated by the adjusting magnet and the moving magnet is equal to the sum of the total weight of the moving part sleeve and the downward suction force of the initial vacuum degree N (N = 5-10) fraction, when the downward suction force of the vacuum degree on the conical valve disc continues to decrease, the conical valve disc moves upward under the action of the magnetic attraction force until it is closed. When the water turbine generates an abnormal huge vacuum area to cause an abnormal vacuum degree, the downward suction force makes the conical valve disc accelerate downward and pass the maximum stroke H, and the moving magnet enters the reverse magnetic field generated by the buffer magnet, the N pole of the moving magnet corresponds to the N pole of the buffer magnet, and a huge upward repulsive force is generated, the repulsive force prevents the moving magnet from moving downward, the closer the distance between the moving magnet and the buffer magnet, the greater the repulsive force, thereby slowing down the conical valve disc until it stops by preventing the moving magnet from moving downward, and the buffer technology effect of preventing the conical valve disc from abnormally moving downward is achieved by the principle that the same poles of magnets repel each other. After the moving magnet stops moving downward, the repulsive force makes the moving magnet return to the range of the maximum stroke H.

[0007] When the conical valve disc rapidly moves downward for air supply, the buffer piston in the piston cavity of the buffer cylinder also rapidly moves downward under the driving of the connecting shaft, at this time, negative pressure is generated in the buffer ring cavity and the conical ring cover is sucked open, the stroke of the conical ring cover being sucked open is a millimeter, and the air in the piston cavity enters the buffer ring cavity through 4-6 air holes, a communication cavity and a conical ring opening. When the air supply device finishes air supply, the conical ring cover rapidly falls freely and blocks the conical ring opening in the process that the conical valve disc and the conical valve opening are rapidly closed, the air in the buffer ring cavity is rapidly sealed, the buffer piston rapidly moves upward and compresses the unsaturated air in the buffer ring cavity into saturated air, and the kinetic energy generated by the acceleration of the moving part sleeve due to the magnetic attraction force between the adjusting magnet and the moving magnet is completely absorbed in the process of compressing the unsaturated air into saturated air, the compression air buffer distance b is 5-10 millimeters. After the air is compressed and buffered, the saturated air is rapidly discharged into the piston cavity through 4-6 exhaust holes, a communication cavity and 4-6 air holes on the conical ring cover, the conical valve disc and the conical valve opening are sealed and closed, and the pre-tightening force of the conical valve disc sealing is equal to the magnetic attraction force formed by the distance c + (1-5) millimeters between the adjusting magnet and the moving magnet.

[0008] The technical scheme provided by the application has compact and ingenious structure, fully applies the characteristics of the magnet, and creatively replaces the spring in the prior art in the field, and a simple conical ring cover structure creatively replaces the air buffering structure of the reverse stop valve in the prior art which is complex and has frequent failures. Compared with the prior art, the application has novelty, creativity and practicality, and will be widely applied to the field of air supply and emergency shutdown of water turbines. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1Front view of two-way magnetic air buffer type magnetic control pre-tightening vacuum area air supplement device

[0010] Figure 2 A-A view of two-way magnetic air buffer type magnetic control pre-tightening vacuum area air supplement device

[0011] Figure 3 B-B view of two-way magnetic air buffer type magnetic control pre-tightening vacuum area air supplement device

[0012] Figure 4 C-C view of two-way magnetic air buffer type magnetic control pre-tightening vacuum area air supplement device

[0013] Wherein:

[0014] 1, air supplement branch pipe 2, rib plate 3, valve pipe

[0015] 4, fixed flange 5, screw hole 6, flange hole

[0016] 7, bolt 8, valve port seat 9, conical valve port

[0017] 10, conical valve disc 11, valve disc center hole 12, main valve shaft

[0018] 13, guide ring table 14, upper cover 15, mounting flange

[0019] 16, piston cavity 17, buffer cylinder 18, through hole

[0020] 19, countersunk bolt 20, gland 21, shaft sleeve protection pipe

[0021] 22, shaft sleeve seat 23, center disc 24, protection pipe flange

[0022] 25, protection pipe 26, moving magnet 27, magnet mounting hole

[0023] 28, magnet center hole 29, inner hexagonal bolt 30, bottom cover

[0024] 31, buffer magnet 32, center counterbore 33, moving disc

[0025] 34, control ring 35, adjusting magnet 36, magnet through hole

[0026] 37, shaft sleeve 38, counterbore 39, connecting shaft

[0027] 40, pin shaft 41, air passage hole 42, communication cavity

[0028] 43, exhaust hole 44, conical ring cover 45, buffer piston

[0029] 46, buffer ring cavity 47, conical ring 48, movable guide hole

[0030] 49, spindle guide hole 50, pin hole 51, piston mounting hole DETAILED DESCRIPTION:

[0031] The buffer cylinder 17 with four ribs 2 and evenly distributed screw holes 5 on the upper and lower ends is fixed on the center of the lower end of the valve pipe 3 with the mounting flange 15 on the upper end. The mounting flange 15 has flange holes 6 and evenly distributed screw holes 5. The shaft sleeve 37 is installed in the shaft sleeve protection pipe 21 with through holes 18 and shaft sleeve seats 22. The upper gland 20 with through holes 18 is fixed on the shaft sleeve protection pipe 21 by means of the evenly distributed screw holes 5 on the shaft sleeve protection pipe 21 and the evenly distributed countersunk holes 38, and then placed below the buffer cylinder 17. The adjusting magnet 35 with the center magnet through hole 36 is fixed on the center disc 23 by means of the magnet installation holes 27 on the moving magnet 26 and the evenly distributed screw holes 5 on the center disc 23 using the countersunk head bolts 19. The magnet through hole 36 on the adjusting magnet 35 is concentric with the through hole 18 on the center disc 23 and placed below the bearing seat 22 with the through hole 18. The control ring 34 is placed below the adjusting magnet 35. The shaft sleeve seat 22, center disc 23, and protection pipe 25 are fixed below the buffer cylinder 17 by means of the flange holes 6 on the upper end protection pipe flange 24 of the protection pipe 25, the flange holes 6 on the center disc 23, the flange holes 6 on the bearing seat 22, and the evenly distributed screw holes 5 on the lower end of the buffer cylinder 17 using the bolts 7. The conical ring cover 44 with exhaust holes 43 is first sleeved on the upper end of the connecting shaft 39 below the main valve shaft 12 through the movable guide hole 48. Then the conical ring cover 44 with the conical ring opening 47, the communication cavity 42, and the pin hole 50 is sleeved on the connecting shaft 39 through the piston installation hole 51. The buffer piston 45 is fixed on the connecting shaft 39 by means of the pin holes 50 on the buffer piston 45 and the pin holes 50 on the connecting shaft 39 using the pin shaft 40. The upper surface of the conical ring cover 44 is a millimeter (a = 10-20 millimeters) away from the lower surface of the main valve shaft 12. The connecting shaft 39 is inserted through the through hole 18 on the gland 20, the shaft sleeve 37, the through hole 18 on the shaft sleeve seat 22, the through hole 18 on the center disc 23, the magnet through hole 36, and the through hole 18 on the control ring 34 to the lower end of the protection pipe 25. The upper cover 14 with the guide ring table 13 is sleeved on the main valve shaft 12 through the main shaft guide hole 49. The upper cover 14 is fixed on the buffer cylinder 17 above by means of the flange holes 6 on the upper cover 14 and the evenly distributed screw holes 5 on the upper end of the buffer cylinder 17 using the bolts 7. The conical valve disc 10 is fixed on the end of the main valve shaft 12 by means of the valve disc middle hole 11 using the bolts 7. The valve port seat 8 with the conical valve port 9 is first fixed on the valve pipe 3 above by means of the flange holes 6 on the upper surface and the evenly distributed screw holes 5 on the mounting flange 15 using the bolts 7. The moving magnet 26 is fixed on the moving disc 33 above by means of the magnet installation holes 27 on the moving magnet 26 and the evenly distributed screw holes 5 on the moving disc 33 using the countersunk head bolts 19. The moving disc 33 is fixed on the lower end of the connecting shaft 39 by means of the center countersunk hole 32 on the moving disc 33, the magnet middle hole 28, and the screw holes 5 on the lower end of the connecting shaft 39 using the inner hexagonal bolts 29. The S pole of the moving magnet 26 corresponds to the N pole of the adjusting magnet 35. The buffer magnet 31 is fixed on the bottom cover 30 above by means of the magnet installation holes 27 and the screw holes 5 using the countersunk head bolts 19. The N pole of the moving magnet 26 corresponds to the N pole of the buffer magnet 31.The bottom cover 30 is fixed under the protection pipe 25 by bolts 7 through the flange holes 6 on the flange 24 of the lower end of the protection pipe 25 and the screw holes 5 evenly distributed on the bottom cover 30. The valve port seat 8 with the valve pipe 3, the buffer cylinder 17, the protection pipe 25 and the conical valve disc 10 is fixed on the air supplement branch pipe 1 by bolts 7 through the flange holes 6 on the valve port seat 8, the flange holes 6 on the mounting flange 15 and the screw holes 5 evenly distributed on the fixing flange 4. The implementation is completed.

Claims

1. A bidirectional magnetic gas buffer type magnetic control pre-tightening vacuum area gas supplementing device, characterized in that, The upper and lower ends of the buffer cylinder with evenly distributed screw holes are fixed on the valve pipe center with mounting flange by four webs; the shaft sleeve pipe with shaft sleeve seat on the lower end and sleeve on the middle is placed in the lower end of the buffer cylinder, the adjusting magnet is fixed on the lower surface of the middle disc, and the control ring is pasted on the lower surface of the adjusting magnet; the sleeve pipe, middle disc and shaft sleeve seat are fixed on the lower end of the buffer cylinder by bolts through the flange hole on the sleeve pipe upper end flange, the flange hole on the middle disc, the flange hole on the shaft sleeve seat and the evenly distributed screw holes on the lower end of the buffer cylinder; the conical ring cover with 4-6 exhaust holes is sleeved on the connecting shaft below the main valve shaft through the movable guide hole, the buffer piston with 4-6 air holes, conical ring and communication cavity on the upper surface is fixed on the connecting shaft below the conical ring cover, the other end of the connecting shaft with the buffer piston on the upper surface is placed into the sleeve pipe through the hole on the cover, the sleeve, the hole on the sleeve seat, the hole on the middle disc and the magnet hole on the adjusting magnet, the moving magnet with the magnet hole is fixed on the moving disc with the center counterbore on the upper surface, the moving disc is sleeved on the connecting shaft end through the magnet hole and fixed on the connecting shaft end by the inner hexagonal bolt and the center counterbore, the distance between the lower surface of the adjusting magnet and the upper surface of the moving magnet is c+(1-5)mm, the value of c is the minimum control distance between the lower surface of the adjusting magnet and the upper surface of the moving magnet, the buffer magnet is fixed on the bottom cover, and then the bottom cover is fixed on the lower end of the sleeve pipe; the upper cover is sleeved on the main valve shaft through the main shaft guide hole on the guide ring table and is fixed on the upper end of the buffer cylinder by bolts, the distance between the lower surface of the upper cover and the upper surface of the buffer piston is 5-10mm; the conical valve disc is fixed on the upper end of the main valve shaft by bolts, the valve port seat with the conical valve port is concentrically fixed on the upper surface of the valve pipe, and then the valve port seat and the valve pipe are fixed on the air supply branch pipe by bolts through the flange hole on the valve port seat, the flange hole on the mounting flange and the evenly distributed screw holes on the fixed flange.

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