Direct force engine piston assembly apparatus and method of use

Abstract

The application discloses a kind of direct force engine piston assembly device and use method, the device includes guiding tool, positioning tool and top pressure module.Positioning tool is the base of entire device, for positioning, clamping to valve body.Guiding tool is installed between valve body and piston, is used to support piston when assembling, piston is guided into valve body, is used to contract piston ring when top pressure.Top pressure module top pressure piston, complete piston and valve body assembly.The application solves the problem of difficult assembly and piston skewing deformation caused by the misalignment of force direction and valve body hole axis during the assembly of direct force engine valve body and piston, and improves the quality and consistency of assembly.

Description

Technical Field

[0001] This invention relates to a direct-drive engine piston assembly device and its usage method, belonging to the field of direct-drive engine assembly technology. Background Technology

[0002] Direct-drive engines are primarily used for trajectory changes and attitude adjustments in aircraft. Their principle involves using valves to control pistons, thereby opening and closing the nozzle in the direction of the trajectory change. Therefore, reliable assembly of the piston and valve body is a crucial aspect of direct-drive engine production. Piston rings are fitted inside the piston grooves to maintain a seal between the valve body and the piston. Because the piston head is machined to conform to the nozzle's internal profile, its diameter is larger than the diameter of the piston section, making it an irregularly shaped piston unlike ordinary cylindrical pistons. Furthermore, the valve body's semi-enclosed structure and confined space prevent the use of piston ring compressors for piston assembly.

[0003] Currently, when a piston ring compressor cannot be used, assembly is performed by manually striking the piston with a rubber mallet after clamping the outer diameter of the valve body in a vise. This method requires a high level of skill from the operator and results in poor assembly consistency. Due to machining errors and burrs on the piston rings, and the lack of a piston ring compressor, the resistance between the piston rings and the valve body is high during assembly, making assembly difficult. Furthermore, the direction of the striking force is difficult to control, leading to poor alignment with the valve body bore axis. These factors can cause piston misalignment and deformation, resulting in piston seizure or even complete failure. Therefore, there is an urgent need for a direct-drive engine piston assembly device. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a direct-force engine piston assembly device and method, which solves the problems of misalignment between the direction of force applied by manual hammering and the axis of the valve body hole, and the inability to use piston ring compressors in narrow spaces for irregularly shaped pistons, resulting in large assembly resistance and piston skewing and deformation.

[0005] The technical solution of this invention is:

[0006] A direct-force engine piston assembly device includes a guide fixture, a positioning fixture, and a top-pressure module;

[0007] The positioning fixture is the base of the entire device and is used to position and clamp the valve body.

[0008] The guide fixture is installed between the valve body and the piston, and includes a guide ring and a clamping body; the guide ring contacts the piston equipped with piston rings, and is used to support the piston and guide the piston into the valve body during assembly, and to retract the piston rings during pressing; the clamping body is sleeved on the outside of the guide ring;

[0009] The top-pressure module is connected to the positioning fixture via a support column and is located above the guide fixture. It moves the top-pressure piston downward to complete the assembly of the piston and the valve body.

[0010] Preferably, the guide ring is a detachable structure, including a convex semicircular ring and a concave semicircular ring. At the upper end of the contact surface of the two semicircular rings, the convex semicircular ring has two trapezoidal tenons and the concave semicircular ring has two trapezoidal mortises. The tenons and mortises cooperate to play a positioning role when assembling the guide ring.

[0011] The internal surface of the guide ring, from top to bottom, is a large cylindrical surface followed by a conical surface, and then transitions to a small cylindrical surface; the inner diameter of the large cylindrical surface is larger than the diameter of the piston head; the conical transition surface is used to guide the piston into the valve body hole and compress the piston ring; the inner diameter of the small cylindrical surface is the same as the inner diameter of the valve body hole, and it mates with the valve body hole.

[0012] Preferably, the clamping body includes a sleeve, a base, an expansion ring, and a clamping screw;

[0013] The sleeve has an opening on its side wall, with its inner side contacting the outer wall of the guide ring and its outer upper end having a conical flange.

[0014] The chassis is annular with N threaded holes evenly distributed, supporting the bottom of the conical flange of the sleeve.

[0015] The expansion ring has N through holes evenly distributed, and each through hole corresponds to a threaded hole; the side wall of the expansion ring has an opening, and the inner side is a conical surface that fits tightly against the sleeve flange.

[0016] N clamping screws are screwed into the threaded holes of the chassis through the through holes.

[0017] Preferably, the positioning fixture includes a base, a positioning body, and a fixing body;

[0018] The base has a through hole in the middle and a circular boss on the upper surface. The boss is the vertical positioning plane of the valve body.

[0019] The positioning body includes a positioning sleeve, a positioning pin, a spring, and an end cap; the positioning sleeve is the outer shell of the positioning body, with a flange at the top for fixing on the base, and a threaded inner hole at the tail end for connecting with the end cap; the positioning pin has a through hole in the center, a cylindrical head with a tapered angle, the tapered surface contacting the inner hole of the valve body, the cylindrical surface having a clearance fit with the positioning sleeve, and a spring fitted at the tail end, the spring driving the positioning pin to extend and retract within the positioning sleeve;

[0020] The fixing body has two symmetrical sets, each set having a J-shaped pressure block, an extension rod, and a screw; the head of the pressure block is a semi-cylindrical structure that contacts the upper surface of the valve body, and the tail has a rectangular notch. There are a pair of circular holes with the same axis on both sides of the notch, which are connected to the extension rod with a flat head and a positioning hole by a pin to form a hinge pair; there is an elongated hole in the middle of the pressure block, through which the screw passes, and the lower end is threaded to the base, and the upper end is connected to a clamping nut, which is tightened to press the valve body.

[0021] Preferably, the top-pressing module includes a platform, a cylinder, a bearing, a guide rod, a limiting ring, a ball joint assembly, and a top cover;

[0022] The platform is connected to the base via a support column. The cylinder and bearing are mounted on the platform. The cylinder is equipped with a three-position five-way center-sealed solenoid valve. The ball head assembly is connected to the cylinder push rod.

[0023] The top cover is connected to the ball head assembly; the top cover includes a metal cylinder with a flange and a soft material cylinder, which are bonded together with an adhesive; the soft material cylinder has a piston head-shaped surface machined inside its end, and the two ends of the metal flange are respectively connected to the guide rods, each guide rod passes through a bearing, and the other end of the guide rod is locked with a bolt to a resilient limiting ring.

[0024] Preferably, the ball head assembly includes a ball housing, a ball pin, a bushing, a retaining ring, and a clamping block;

[0025] The upper end of the ball housing is connected to the cylinder push rod. The bushing between the ball housing and the ball pin is a spherical sleeve made of self-lubricating material with several slots filled with grease. The bushing is fitted onto the ball pin for lubrication. The retaining ring passes through the ball pin and fits against the bushing to limit the swing angle of the ball pin. The outer ring of the clamping block has threads that connect to the internal threads of the ball housing to support the retaining ring.

[0026] Preferably, the solenoid valve of the cylinder is controlled by a PLC; by controlling the air supply time, the cylinder provides different top pressure strokes.

[0027] A method for assembling a piston for a direct-drive engine, using a direct-drive engine piston assembly device, comprising:

[0028] Place the piston with the piston rings installed into the guide ring and position it in the inner hole of the valve body; then insert the clamping body through the piston from above into the valve body boss, tighten the clamping bolts so that the outer side of the clamping body presses against the inner wall of the plane where the valve body boss is located, and the inner side presses against the guide ring.

[0029] Place the valve body on the annular boss on the positioning fixture base, so that the conical surface of the positioning body is against the inner hole of the valve body. Use the bottom surface of the valve body and the inner hole as the positioning reference to complete the valve body positioning; then contact the head of the fixing body with the upper end face of the valve body and tighten the clamping nut on the fixing body.

[0030] Activate the short-stroke mode of the top pressure module, press down on the large end of the piston, and press all the piston rings on the piston into the valve body's internal bore. Then, the top pressure module returns, completing the initial assembly.

[0031] After loosening the clamping body, remove the clamping body from the valve body, lift the guide ring upward to the top of the piston, disassemble it, move it horizontally away from the piston, and then move it vertically out of the valve body;

[0032] Activate the long stroke mode of the top pressure module, press down on the large end of the piston, and after the piston is assembled in place, the top pressure module returns and moves out of the valve body, completing the assembly of the valve body and the piston.

[0033] The advantages of this invention compared to the prior art are:

[0034] (1) The positioning method of this device, which uses the inner hole of the valve body as the horizontal reference, avoids the coaxiality deviation between the outer circle center and the hole center compared to the positioning method of the bench vise, which uses the outer circle of the valve body as the reference.

[0035] (2) This device achieves the compression of piston rings during the assembly of irregularly shaped pistons in narrow spaces through the cooperation of detachable guide rings and clamping bodies. Compared with direct assembly without piston rings, it reduces the resistance of assembly and can appropriately reduce the requirements for the precision and surface quality of piston rings.

[0036] (3) This device replaces manual knocking with cylinder pressing, realizing semi-automation, reducing the labor intensity of workers, and improving the consistency and stability of assembly. The cylinder and the top cover are connected by ball head assembly and guided by guide rod, which can avoid the piston ring extrusion deformation caused by the deviation of the force direction from the valve body hole axis, resulting in increased resistance and piston tilting deformation. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0038] Figure 1 This is an isometric view of the direct-force engine piston assembly device during operation according to an embodiment of the present invention;

[0039] Figure 2 This is a partial cross-sectional view of the front of the direct-force engine piston assembly device in operation according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the guide tooling according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the positioning body according to an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of the ball head assembly according to an embodiment of the present invention. Detailed Implementation

[0043] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0044] This invention proposes a direct-force engine piston assembly device, comprising a guide fixture 1, a positioning fixture 2, and a top-pressing module 3, such as... Figure 1 As shown, the positioning fixture is the base of the entire device, and the valve body is positioned and clamped on the positioning fixture 2. The guide fixture 1 is installed between the valve body and the piston, and its function is to fix the piston inside the valve body and compress the piston rings during the process of guiding the piston to be pressed into the valve body. The top pressure module 3 is connected to the base of the positioning fixture 2 through the support column, located above the entire device, and is the power source for assembling the piston.

[0045] like Figure 2 , Figure 3 As shown, the guide fixture 1 includes a guide ring 11 and a clamping body 12, with the clamping body 12 fitted over the guide ring 11. The guide ring 11 directly contacts the piston with piston rings, supporting the piston during assembly and retracting the piston rings during pressing. The clamping body 12, fitted over the guide ring 11, ensures the position and closure of the guide ring 11. The guide ring 11 is a detachable structure, consisting of a convex semicircular ring 111 and a concave semicircular ring 112. At the upper end of the contact surface of the two semicircular rings, the convex semicircular ring has two trapezoidal tenons, and the concave semicircular ring has two trapezoidal mortises. The tenons and mortises engage, providing positioning during guide ring assembly. The inner surface of the guide ring 11 is a large cylindrical surface followed by a conical surface, and then transitions to a small cylindrical surface. The inner diameter of the large cylindrical surface is slightly larger than the diameter of the piston head to prevent interference with the parts when disassembling and removing them. The inner diameter of the small cylindrical surface is consistent with the inner diameter of the valve body hole and directly connects to the valve body hole. The conical transition surface between the two cylindrical surfaces plays the role of guiding the piston to compress the piston ring when it enters the valve body hole.

[0046] The clamping body 12 includes a sleeve 121, a base 122, an expansion ring 123, and clamping screws 124. The sleeve 121 has an opening on its side wall, its inner side contacting the outer wall of the guide ring, and a conical flange at its upper outer end, the bottom surface of which contacts the base. The base 122 is annular with eight evenly distributed threaded holes, supporting the bottom of the sleeve's conical flange, and is connected to the expansion ring 123 via the clamping screws 124. The expansion ring 123 has eight evenly distributed through holes, an opening on its side, and an inner conical surface that fits tightly against the conical surface of the sleeve 121's flange. Eight high-strength clamping screws 124 pass through the through holes and are screwed into the threaded holes of the base. By tightening the clamping screw, the expansion ring 123 is squeezed against the sleeve 121. The expanded expansion ring 123 presses against the inner wall of the plane where the boss is located in the valve body, which plays a role in fixing the entire guide fixture. The compressed sleeve 121 contacts the guide ring 11, fixes the guide ring 11 and provides clamping force to ensure that the guide ring closes during the pressing process.

[0047] The positioning fixture 2 includes a base 21, a positioning body 22, and a fixing body 23. The base 21 has a through hole in the center for mounting the positioning body, and a circular boss centered on the through hole; the boss forms the vertical positioning plane of the valve body. Figure 4 As shown, the positioning body 22 is fixed inside the through hole of the base 21. The positioning body 22 includes a positioning sleeve 221, a positioning pin 222, a spring 223, and an end cap 224. The positioning sleeve 221 is the outer shell of the positioning body 22, with a flange at its top for fixing on the base; the inner hole at its tail end has threads for connecting with the end cap 224. The positioning pin 222 has a through hole in its center, avoiding the cylindrical connecting rod at the bottom of the piston when pressed; its head is a cylindrical part with a tapered angle, the tapered surface of which contacts the inner hole of the valve body, achieving horizontal positioning of the valve body through inner hole positioning, and the cylindrical surface has a small clearance fit with the positioning sleeve; the tail end is fitted with a spring 223, which can drive the positioning pin 222 to extend and retract within the positioning sleeve 221. The height of the positioning pin 222 is adjusted by adjusting the depth to which the end cap 224 is screwed into the tail end of the positioning sleeve 221. The fixing body 23 has two symmetrical sets, which are fixed to the base 21 by an extension rod, with a screw rod passing through the through hole in the middle, and a clamping nut on the rod. The symmetrical structure of the fixed body 23 is a J-shaped pressure block. The head is a semi-cylindrical structure that contacts the upper surface of the valve body. The tail has a rectangular notch with a pair of circular holes with the same axis on both sides of the notch. These holes are connected to the flat extension rod with positioning holes at the head by a pin to form a hinge pair. There is an elongated hole in the middle. The screw passes through the elongated hole, and the lower end is threaded to the base. The upper end is connected to a clamping nut, which is tightened to press the valve body.

[0048] The top-pressing module 3 uses a solenoid valve and PLC control to achieve two different top-pressing strokes, long and short. The top-pressing module 3 includes a platform 31, a cylinder 32, a bearing 33, a guide rod 34, a limit ring 35, a ball head assembly 36, and a top cover 37, as follows... Figure 2As shown. Platform 31 is connected to the base via a support column and threaded holes. Cylinder 32 and bearing 33 are mounted on platform 31 with countersunk screws. Cylinder 32 uses a three-position five-way center-sealed solenoid valve and PLC control, which can provide two different pressing strokes (long and short) by controlling the air supply time. Top cover 37 is formed by bonding a metal cylinder with a flange at the upper end to a soft material cylinder at the lower end with adhesive. The end face of the soft material cylinder is machined according to the shape of the piston head, so that it directly contacts the piston head during the pressing process to avoid damage. There are two threaded holes on the metal flange, which are connected to two guide rods respectively. The guide rod 34 passes through bearing 33, and the other end is locked with a bolt to a flexible limiting ring 35. The guide rod 34 and the limiting ring 35 guide and limit the pressing of top cover 37. The center threaded hole of the top cover 37 is connected to the push rod of the cylinder 32 through the ball pin of the ball head assembly 36. The ball head assembly 36 consists of a ball housing 351, a ball pin 352, a bushing 353, a retaining ring 354, and a clamping block 355. Figure 5 As shown, rotation and oscillation can be achieved. The threaded hole at the upper end of the ball housing 351 is connected to the cylinder push rod. The bushing 353 between the ball housing 351 and the ball pin 352 is a spherical sleeve made of self-lubricating material with 8 slots. The slots are filled with grease and have a certain elasticity. It can be fitted onto the ball pin 352 to provide lubrication. The retaining ring 354 passes through the ball pin 352 and fits against the bushing 353 to limit the oscillation angle of the ball pin 352. The outer ring of the clamping block 355 has threads that are connected to the internal threads of the ball housing 351 to support the retaining ring.

[0049] A method of using the direct-force engine piston assembly device includes the following steps:

[0050] Step 1: Assemble the guide fixture 1 in the correct manner. Insert the convex semi-circular tenon into the concave semi-circular tenon to form the guide ring 11. Then, place the piston with the piston ring installed into the guide ring 11 and position it at the inner hole of the valve body. At this time, the guide ring 11 serves to support the piston. Then, insert the clamping body 12 through the piston from above into the boss inside the valve body. Then, use a torque wrench to tighten the clamping screw 124 so that the outer side of the clamping body 12 presses against the inner wall of the plane where the boss of the valve body is located, and the inner side presses against the guide ring 11, thus completing the fixation of the guide fixture 1.

[0051] Step 2: Place the valve body on the annular boss on the base 21 of the positioning fixture 2, so that the conical surface of the positioning body 22 is against the inner hole of the valve body. Use the bottom surface of the valve body and the inner hole as the positioning reference to complete the valve body positioning; make the head of the fixing body 23 contact the upper end face of the valve body, and tighten the clamping nut on the fixing body to complete the valve body clamping.

[0052] Step 3: Activate the short-stroke mode switch of the top pressure module 3. Under the drive of the cylinder 32 push rod, the top cover 37 pushes down on the large end of the piston, pressing all the piston rings on the piston into the valve body hole. Then the top cover 37 returns, completing the initial assembly and leaving enough space for the removal of the clamping body 12 to prevent interference.

[0053] Step 4: After loosening the clamping screw 124 on the clamping body 12, remove the clamping body 12 from the valve body. Then, in sequence, lift the convex semicircular ring 111 and concave semicircular ring 112 in the guide ring upwards to the top of the piston, move them horizontally away from the piston, and then move them vertically out of the valve body to complete the removal of the guide fixture.

[0054] Step 5: Activate the long stroke mode switch of the top pressure module 3. Under the drive of the cylinder 32 push rod, the top cover 37 pushes down on the large end of the piston. After the piston is assembled in place, the top cover returns, the fixing body is released, the valve body is removed, and the assembly of the valve body and the piston is completed.

[0055] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A piston assembly device for a direct-drive engine, characterized in that, Includes guide fixtures, positioning fixtures, and top-pressing modules; The positioning fixture is the base of the entire device and is used to position and clamp the valve body. The guide fixture is installed between the valve body and the piston, and includes a guide ring and a clamping body; the guide ring contacts the piston equipped with piston rings, and is used to support the piston and guide the piston into the valve body during assembly, and to retract the piston rings during pressing; the clamping body is sleeved on the outside of the guide ring; The top-pressing module is connected to the positioning fixture via a support column and is located above the guide fixture. It moves the top-pressing piston downward to complete the assembly of the piston and the valve body. The clamping body includes a sleeve, a base, an expansion ring, and clamping screws; The sleeve has an opening on its side wall, with its inner side contacting the outer wall of the guide ring and its outer upper end having a conical flange. The chassis is annular with N threaded holes evenly distributed, supporting the bottom of the conical flange of the sleeve. The expansion ring has N through holes evenly distributed, and each through hole corresponds to a threaded hole; the side wall of the expansion ring has an opening, and the inner side is a conical surface that fits tightly against the sleeve flange. N clamping screws are screwed into the threaded holes of the chassis through the through holes.

2. The direct-drive engine piston assembly device according to claim 1, characterized in that, The guide ring is a detachable structure, including a convex semicircular ring and a concave semicircular ring. At the upper end of the contact surface of the two semicircular rings, the convex semicircular ring has two trapezoidal tenons and the concave semicircular ring has two trapezoidal mortises. The tenons and mortises cooperate to play a positioning role when assembling the guide ring. The internal surface of the guide ring, from top to bottom, is a large cylindrical surface followed by a conical surface, and then transitions to a small cylindrical surface; the inner diameter of the large cylindrical surface is larger than the diameter of the piston head; the conical transition surface is used to guide the piston into the valve body hole and compress the piston ring; the inner diameter of the small cylindrical surface is the same as the inner diameter of the valve body hole, and it mates with the valve body hole.

3. The direct-drive engine piston assembly device according to claim 1, characterized in that, The positioning fixture includes a base, a positioning body, and a fixing body; The base has a through hole in the middle and a circular boss on the upper surface. The boss is the vertical positioning plane of the valve body. The positioning body includes a positioning sleeve, a positioning pin, a spring, and an end cap; the positioning sleeve is the outer shell of the positioning body, with a flange at the top for fixing on the base, and a threaded inner hole at the tail end for connecting with the end cap; the positioning pin has a through hole in the center, a cylindrical head with a tapered angle, the tapered surface contacting the inner hole of the valve body, the cylindrical surface having a clearance fit with the positioning sleeve, and a spring fitted at the tail end, the spring driving the positioning pin to extend and retract within the positioning sleeve; The fixing body has two symmetrical sets, each set having a J-shaped pressure block, an extension rod, and a screw; the head of the pressure block is a semi-cylindrical structure that contacts the upper surface of the valve body, and the tail has a rectangular notch. There are a pair of circular holes with the same axis on both sides of the notch, which are connected to the extension rod with a flat head and a positioning hole by a pin to form a hinge pair; there is an elongated hole in the middle of the pressure block, through which the screw passes, and the lower end is threaded to the base, and the upper end is connected to a clamping nut, which is tightened to press the valve body.

4. The direct-drive engine piston assembly device according to claim 1, characterized in that, The top pressure module includes a platform, cylinder, bearing, guide rod, limit ring, ball head assembly, and top cover; The platform is connected to the base via a support column. The cylinder and bearing are mounted on the platform. The cylinder is equipped with a three-position five-way center-sealed solenoid valve. The ball head assembly is connected to the cylinder push rod. The top cover is connected to the ball head assembly; the top cover includes a metal cylinder with a flange and a soft material cylinder, which are bonded together with an adhesive; the soft material cylinder has a piston head-shaped surface machined inside its end, and the two ends of the metal flange are respectively connected to the guide rods, each guide rod passes through a bearing, and the other end of the guide rod is locked with a bolt to a resilient limiting ring.

5. A direct-drive engine piston assembly device according to claim 4, characterized in that, The ball head assembly includes a ball housing, a ball pin, a bushing, a retaining ring, and a clamping block; The upper end of the ball housing is connected to the cylinder push rod. The bushing between the ball housing and the ball pin is a spherical sleeve made of self-lubricating material with several slots filled with grease. The bushing is fitted onto the ball pin for lubrication. The retaining ring passes through the ball pin and fits against the bushing to limit the swing angle of the ball pin. The outer ring of the clamping block has threads that connect to the internal threads of the ball housing to support the retaining ring.

6. A direct-drive engine piston assembly device according to claim 4, characterized in that, The solenoid valve of the cylinder is controlled by a PLC; by controlling the air supply time, the cylinder provides different top pressure strokes.

7. A method for assembling a piston for a direct-drive engine, using the direct-drive engine piston assembly apparatus of claim 3, characterized in that, include: Place the piston with the piston rings installed into the guide ring and position it in the inner hole of the valve body; then insert the clamping body through the piston from above into the valve body boss, tighten the clamping screw, so that the outer side of the clamping body presses against the inner wall of the plane where the valve body boss is located, and the inner side presses against the guide ring. Place the valve body on the annular boss on the positioning fixture base, so that the conical surface of the positioning body is against the inner hole of the valve body. Use the bottom surface of the valve body and the inner hole as the positioning reference to complete the valve body positioning; then contact the head of the fixing body with the upper end face of the valve body and tighten the clamping nut on the fixing body. Activate the short-stroke mode of the top pressure module, press down on the large end of the piston, and press all the piston rings on the piston into the valve body's internal bore. Then, the top pressure module returns, completing the initial assembly. After loosening the clamping body, remove the clamping body from the valve body, lift the guide ring upward to the top of the piston, disassemble it, move it horizontally away from the piston, and then move it vertically out of the valve body; Activate the long stroke mode of the top pressure module, press down on the large end of the piston, and after the piston is assembled in place, the top pressure module returns and moves out of the valve body, completing the assembly of the valve body and the piston.

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