A new pressure controlled pulse valve

Abstract

The utility model relates to a novel pressure control pulse valve belongs to pressure control valve technical field. The pulse valve includes the valve body, the valve body is divided into pressure reducing valve part and reversing valve part, the air outlet end of pressure reducing valve part communicates with the air inlet end of reversing valve part, the valve body includes the valve seat, the valve seat is provided with pressure reducing valve cavity and reversing valve cavity side by side, the valve seat is fixed with pressure reducing valve cover coaxially on the upside of pressure reducing valve cavity, the upside of reversing valve cavity is fixed with reversing valve cover coaxially, the air inlet and pressure detection port are exposed in the bottom of valve seat in pressure reducing valve cavity, the pilot air inlet, air outlet and exhaust port are exposed in the bottom of valve body in reversing valve cavity, the air outlet end of pressure reducing valve cavity communicates pressure detection port. The pressure control pulse valve of the utility model design can realize the pressure stability of reversing valve part air inlet through the integrally designed pressure reducing valve part, thereby improves the accuracy and stability of reversing control to reversing valve part.

Description

Technical Field

[0001] This utility model relates to the field of pressure control valve technology, specifically to a novel pressure control pulse valve. Background Technology

[0002] In locomotive braking systems, pressure pulse control plays a crucial role. It achieves rapid braking response by opening or cutting off the air supply to pneumatically controlled valves at specified pressures. Existing pressure pulse control systems are primarily composed of a series-connected direct-acting pressure reducing valve and a directional valve. However, the valve body design of existing direct-acting pressure reducing valves is relatively simple. These valves can only reduce pressure and cannot maintain a stable pressure at the outlet. This often leads to unstable air pressure control during application. Furthermore, prolonged use of two valve bodies in series can cause damage and leakage to the connecting pipeline due to excessive instantaneous opening and closing. Summary of the Invention

[0003] To address the problems in the existing technology, this utility model patent designs a new type of pressure control pulse valve to solve the problem that the existing braking pulse control valve has unsatisfactory performance due to structural defects.

[0004] The technical solution adopted by this utility model is as follows: the pulse valve includes a valve body, the valve body includes a valve seat, the valve seat has a pressure reducing valve chamber and a reversing valve chamber arranged side by side, the valve seat has a pressure reducing valve cover coaxially fixed on the upper side of the pressure reducing valve chamber, and a pressure reducing valve assembly is arranged inside it, the valve seat has a reversing valve cover coaxially fixed on the upper side of the reversing valve chamber, and a reversing valve assembly is arranged inside it, the pressure reducing valve chamber has an air inlet and a pressure detection port exposed at the bottom of the valve seat, the reversing valve chamber has a pilot air inlet, an air outlet and an exhaust port exposed at the bottom of the valve body, the air outlet of the pressure reducing valve chamber is connected to the air inlet of the reversing valve chamber through an air passage, and the air outlet of the pressure reducing valve chamber is connected to the pressure detection port.

[0005] Furthermore, the pressure reducing valve assembly includes an adjusting bolt, a first support spring, a pressure reducing piston, and a pressure reducing valve core. The adjusting bolt is threaded into an internal threaded hole at the center of the pressure reducing valve cover. A spring seat is slidably connected to the inner cavity of the pressure reducing valve cover. The bottom end of the adjusting bolt abuts against the center of the top surface of the spring seat. The upper part of the pressure reducing valve cavity is a pressure reducing piston cavity, and the lower part is a gas flow cavity. The pressure reducing piston is slidably connected in the pressure reducing piston cavity. The upper and lower ends of the first support spring are respectively connected to the spring seat and the pressure reducing piston. A valve seat is provided in the flow cavity to divide the flow cavity into... The lower air intake chamber and the upper air outlet chamber are connected. The air intake chamber is connected to the air inlet, and the air outlet chamber is connected to the pressure detection port and the air inlet end of the reversing valve chamber. A valve port is opened at the center of the valve seat. The pressure reducing valve core is coaxially arranged in the air intake chamber with the valve port. The top surface of the pressure reducing valve core is a sealing disc. The diameter of the sealing disc is larger than the diameter of the valve port. A pressure reducing valve rod is assembled at the upper center of the pressure reducing valve core. The pressure reducing valve rod coaxially passes through the valve port, and its top end passes upward into the pressure reducing piston chamber and abuts against the center of the bottom surface of the pressure reducing piston. The air outlet chamber is provided with an exhaust hole that communicates with the pressure reducing piston chamber.

[0006] Furthermore, a guide plate is fixed to the center of the bottom surface of the pressure reducing piston chamber by a retaining ring through a hole. A guide hole is opened at the center of the guide plate. The top end of the pressure reducing valve rod extends into the pressure reducing piston chamber through the guide hole. The guide plate also has multiple flow holes on the radial outer side of the guide hole.

[0007] Furthermore, the pressure reducing piston has an axially penetrating overflow hole at its center, and a sealing gasket is provided at the bottom opening of the overflow hole. When the bottom surface of the pressure reducing piston abuts against the pressure reducing valve stem, the top surface of the pressure reducing valve stem can seal the overflow hole. The side of the pressure reducing valve cover has a pressure relief hole.

[0008] Furthermore, a limiting groove is formed at the bottom center of the pressure reducing valve cavity, and the bottom of the pressure reducing valve core is slidably connected in the limiting groove. The top opening of the limiting groove is sealed by a washer and a small K-type sealing ring. The interior of the pressure reducing valve core is a hollow structure, and a return spring is provided between the inside and the bottom surface of the limiting groove. The lower half of the pressure reducing valve stem has a through cavity that communicates with the hollow cavity inside the pressure reducing valve core. The through cavity inside the pressure reducing valve stem has an opening in the middle of the pressure reducing valve stem.

[0009] Furthermore, a locking nut is threaded onto the adjusting bolt, and the locking nut is located on the outside of the pressure reducing valve cover.

[0010] Furthermore, the pressure reducing valve cover is provided with screw holes with internal threads at the pressure relief holes. There are multiple pressure relief holes, which are symmetrically distributed around the radial periphery of the screw holes. An overflow washer and a sealing plate are fixed at the screw holes by a threaded semi-circular head screw. The sealing plate can completely cover the surrounding pressure relief holes.

[0011] Furthermore, a valve stem sleeve is fixed in the reversing valve chamber, and a reversing valve stem is slidably connected to the center of the valve stem sleeve. An exhaust port, an outlet port, and an inlet port are sequentially arranged along the axial direction on the valve stem sleeve. The exhaust port connects to the exhaust port, the outlet port connects to the outlet port, and the inlet port connects to the outlet chamber of the pressure reducing valve chamber. Two reduced-diameter sections are spaced apart in the middle of the reversing valve stem, forming a first sealing section, a second sealing section, and a third sealing section sequentially on the reversing valve stem. The interior of the reversing valve cover is a pilot piston chamber, in which a pilot piston is slidably connected. An opening is provided at the top of the side wall of the pilot piston chamber, connecting to a pilot air inlet. The pilot piston is in the shape of an inverted cup, with a columnar protrusion formed downwards at the axial center of its top surface. The bottom end of the columnar protrusion abuts against the top of the reversing valve stem. A second support spring is provided inside the pilot piston, with its two ends connected to the top surface of the pilot piston and the top of the valve stem sleeve, respectively.

[0012] Furthermore, the bottom surface of the valve seat has a through internal thread hole corresponding to the axis of the reversing valve chamber, and an adjusting bolt is threaded into the through internal thread hole.

[0013] Furthermore, a buffer pad is fixed on the top surface of the pilot piston chamber of the reversing valve cover, a filter element is provided at the air inlet and the pilot air inlet respectively, an exhaust muffler is provided at the exhaust port, and a large K-shaped sealing ring is embedded in the outer periphery of the pressure reducing piston and the pilot piston for sealing.

[0014] Compared to existing technologies, the advancements of this novel pressure control pulse valve, designed in this utility model patent, lie in:

[0015] This utility model's pressure control pulse valve adopts an integrated design of a pressure reducing valve and a reversing valve. A single valve body can achieve both pressure stabilization and reversing control, simplifying the connecting pipelines between valve bodies used in traditional series configurations and ensuring long-term stable operation of the pressure control system. The pressure reducing valve section of the pressure control pulse valve divides its flow chamber into an upper outlet chamber and a lower inlet chamber via a valve seat. The pressure reducing valve core is opened by a pressure reducing piston, and a guide plate is provided at the bottom of the pressure reducing piston chamber. The guide plate also has a through-hole that links the outlet chamber and the pressure reducing piston chamber. The feedback pressure from the outlet chamber can pass through the through-hole into the piston chamber, and together with the exhaust port, send the feedback pressure into the pressure reducing piston chamber. The plug cavity generates a feedback thrust on the pressure-reducing piston, improving the sensitivity of the pressure-reducing valve to overpressure feedback response. An enlarged diameter sealing disc is installed at the top of the valve core assembly of the pressure-reducing valve. The air pressure in the intake chamber can create an upward thrust on the bottom surface of the sealing disc, assisting the return spring in pushing the valve core assembly upward, improving the speed of the pressure-reducing movement response and the pressure stabilization effect. Simultaneously, a through cavity is provided between the pressure-reducing valve stem and the pressure-reducing valve core. The bottom end of the pressure-reducing valve core and the sealed limiting groove form a piston cavity. Feedback air pressure can pass through this cavity to the bottom end of the valve core assembly, ensuring a balance of feedback air pressure on both sides of the pressure-reducing valve core. This prevents the pressure-reducing valve core from being pushed downwards from the valve seat after overpressure, thus affecting the pressure-reducing effect. A sealing plate is installed at the pressure relief hole of the pressure-reducing valve cover. The sealing plate does not affect the air outlet of the pressure relief hole and also prevents external dust from entering the valve cavity of the upper valve body through the pressure relief hole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a new type of pressure control pulse valve.

[0017] Figure 2 This is a schematic diagram of the bottom front view of the new pressure control pulse valve.

[0018] Figure 3 yes Figure 2 A schematic diagram of the AA-direction cross-sectional structure of the pilot air inlet.

[0019] Figure 4 yes Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0020] In the diagram, 1 is the valve seat, 2 is the pressure reducing valve section, 3 is the pressure reducing valve cover, 4 is the reversing valve section, 5 is the reversing valve cover, 6 is the air inlet, 7 is the pilot air inlet, 8 is the air outlet, 9 is the exhaust port, 10 is the pressure detection hole, 21 is the pressure reducing valve core, 22 is the pressure reducing valve stem, 23 is the valve seat, 24 is the guide plate, 25 is the pressure reducing piston, 26 is the exhaust port, 27 is the overflow port, 28 is the flow port, 29 is the limit slide groove, 31 is the first support spring, 32 is the spring seat, 33 is the adjusting bolt, and 34 is the lock. Tightening nut, 35 pressure relief hole, 36 sealing plate, 41 valve stem sleeve, 42 reversing valve stem, 43 adjusting bolt, 45 air inlet port, 46 air outlet port, 47 exhaust port, 48 filter element, 411 first sealing section, 412 second sealing section, 413 third sealing section, 414 first diameter reduction section, 415 second diameter reduction section, 51 pilot piston chamber, 52 pilot piston, 53 second support spring, 55 cylindrical protrusion, 54 buffer pad. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model patent designs an embodiment of a novel pressure control pulse valve. This embodiment of the pulse valve includes a valve body, which includes a valve seat 1. A pressure reducing valve chamber and a reversing valve chamber are arranged side-by-side on the valve seat 1. A pressure reducing valve cover 3 is coaxially fixed to the upper side of the pressure reducing valve chamber, and a pressure reducing valve assembly is disposed within it, forming a pressure reducing valve section 2. A reversing valve cover 5 is coaxially fixed to the upper side of the reversing valve chamber, and a reversing valve assembly is disposed within it, forming a reversing valve section 4. An air inlet 6 and a pressure detection port 10 are exposed at the bottom of the pressure reducing valve chamber on the valve seat 1. A pilot air inlet 7, an air outlet 8, and an exhaust port 9 are exposed at the bottom of the reversing valve chamber on the valve seat 1. Filter elements 48 are respectively disposed at the air inlet 6 and the pilot air inlet 7, and are sealed by O-rings. An exhaust silencer is disposed at the exhaust port 9.

[0023] The pressure reducing valve assembly of pressure reducing valve section 2 includes an adjusting bolt 33, a first support spring 31, a pressure reducing piston 25, and a pressure reducing valve core 21. The adjusting bolt 33 is threaded into the internal threaded hole at the center of the pressure reducing valve cover 3. A spring seat 32 is slidably connected in the inner cavity of the pressure reducing valve cover 3. The bottom end of the adjusting bolt 33 extends into the inner cavity of the pressure reducing valve cover 3 and abuts against the recessed hole at the center of the top surface of the spring seat 32. Tightening the adjusting bolt 33 can push the spring seat 32 to slide downward. A locking nut 34 is also threaded onto the adjusting bolt 33. The locking nut 34 is located on the outside of the pressure reducing valve cover 3 and locks the adjusting bolt 33 in place.

[0024] The upper part of the pressure reducing valve chamber of the pressure reducing valve section 2 is the pressure reducing piston chamber, and the lower part is the gas flow chamber. The pressure reducing piston 25 is slidably connected in the pressure reducing piston chamber, and a large K-type sealing ring is embedded and fixed in the outer circumference of the pressure reducing piston 25 for sealing. The upper and lower ends of the first support spring 31 are respectively connected to the spring seat 32 and the pressure reducing piston 25. A valve seat 23 is horizontally fixed in the gas flow chamber through a hole with a washer, and an O-ring is provided on the bottom side of the valve seat 23 for sealing. The horizontally placed valve seat 23 divides the flow chamber into a lower air inlet chamber and an upper air outlet chamber. The air inlet chamber is connected to the air inlet 6 at the bottom of the valve seat, and the air outlet chamber is connected to the pressure detection port 10 and the air inlet port 45 of the reversing valve chamber. A valve port is located at the center of the valve seat 23. The pressure-reducing valve core 21 is coaxially mounted with the valve port in the intake chamber. The top surface of the pressure-reducing valve core 21 is a sealing disc with a diameter larger than that of the valve port. A sealing gasket is mounted on the sealing disc, which can completely seal the valve port of the valve seat 23 from below. A pressure-reducing valve stem 22 is assembled and fixed at the upper center of the pressure-reducing valve core 21. The pressure-reducing valve stem 22 coaxially passes through the valve port of the valve seat 23, and its outer diameter is smaller than that of the valve port. The top end of the pressure-reducing valve stem 22 extends upward into the pressure-reducing piston chamber and abuts against the center of the bottom surface of the pressure-reducing piston 25. The exhaust chamber is also provided with an exhaust hole 26 that communicates with the pressure-reducing piston chamber. A limiting groove 29 is located at the center of the bottom of the pressure-reducing valve chamber. The bottom of the pressure-reducing valve core 21 is slidably connected in the limiting groove 29. A gasket and a small K-type sealing ring are fixed to the top opening of the limiting groove 29 through a hole for sealing. The pressure reducing valve core 21 has a hollow internal structure, and a return spring is installed between its interior and the bottom surface of the limiting slide groove 29. In addition, the lower half of the pressure reducing valve stem 22 has a through cavity that communicates with the hollow cavity inside the pressure reducing valve core 21, and the through cavity inside the pressure reducing valve stem 22 has an opening in the middle of the pressure reducing valve stem 22.

[0025] A guide plate 24 is fixed to the bottom center of the pressure reducing piston chamber by a retaining ring through a hole. A guide hole is opened at the center of the guide plate 24. The top end of the pressure reducing valve rod 22 passes through the guide hole and extends into the pressure reducing piston chamber. The guide plate 24 also has multiple axially penetrating flow holes 28 on the radial outer side of the guide hole. The flow holes 28 connect the pressure reducing piston chamber and the gas outlet chamber of the pressure reducing valve chamber.

[0026] An axially penetrating overflow hole 27 is formed at the center of the pressure-reducing piston 25, and a sealing gasket is provided at the bottom opening of the overflow hole 27. When the bottom surface of the pressure-reducing piston 25 abuts against the pressure-reducing valve stem 22, the top surface of the pressure-reducing valve stem 22 can seal the overflow hole 27. A pressure relief hole 35 is formed on the side of the pressure-reducing valve cover 3. The pressure-reducing valve cover 3 has a screw hole with internal thread at the pressure relief hole 35. There are multiple pressure relief holes 35, which are symmetrically distributed around the radial periphery of the screw holes. An overflow washer and a sealing plate 36 are fixed at the screw hole by a threaded semi-circular head screw. The sealing plate 36 can completely cover the surrounding pressure relief holes 35, but will not obstruct the pressure relief and exhaust of the pressure relief holes 35.

[0027] A valve stem sleeve 41 is fixed in the reversing valve chamber of the reversing valve section 4. The inner side of the valve stem sleeve 41 is an axially penetrating cavity, in which a reversing valve stem 42 is slidably connected. An exhaust port 47, an outlet port 46, and an inlet port 45 are sequentially spaced along the axial direction from top to bottom on the valve stem sleeve 41. An annular groove is provided on the outer side of the valve stem sleeve 41 corresponding to each port, forming a connecting cavity. The exhaust port 47 connects to the exhaust port 9 on the bottom surface of the valve seat 1, the outlet port 46 connects to the outlet port 8 on the bottom surface of the valve seat 1, and the inlet port 45 connects to the outlet cavity of the pressure reducing valve chamber. A through-hole with internal thread is opened on the bottom surface of the valve seat 1 corresponding to the axis of the reversing valve chamber. An adjusting bolt 43 is threaded into the through-hole. A return spring is also provided between the bottom end of the reversing valve stem 42 and the adjusting bolt 43.

[0028] The reversing valve stem 42 has a first reduced diameter section 414 and a second reduced diameter section 415 spaced apart in the middle. These two reduced diameter sections sequentially form a first sealing section 411, a second sealing section 412, and a third sealing section 413 on the reversing valve stem 41. Each sealing section has an O-ring embedded in its outer circumference. The first sealing section 411 seals the top opening of the valve stem sleeve 41, the third sealing section 413 seals the bottom opening of the valve stem sleeve, and the third sealing section 412 seals the outlet port 46 with the inlet ports 45 or exhaust ports 47 on either side. The first reduced diameter section 414 connects the outlet port 46 with the exhaust port 47 during movement, and the second reduced diameter section 415 connects the outlet port 46 with the inlet port 45 during movement.

[0029] The interior of the reversing valve cover 5 is a pilot piston chamber 51, in which a pilot piston 52 is slidably connected. A large K-shaped sealing ring is embedded and fixed on the outer periphery of the pilot piston 52, forming a seal with the inner wall of the reversing valve cover 5. The top of the side wall of the pilot piston chamber 51 has an opening that connects to the pilot air inlet 7. A buffer pad 54 is fixed on the top surface of the pilot piston chamber 51 to buffer the impact of the pilot piston 52. The pilot piston 52 is in the shape of an inverted cup, with a columnar protrusion 55 formed downward at the axial center of its top surface. The top end of the reversing valve stem 42 extends into the pilot piston chamber 51, and the bottom end of the columnar protrusion 55 abuts against the top end of the reversing valve stem 42. A second support spring 53 is provided inside the pilot piston 52, and the two ends of the second support spring 53 are respectively connected to the top surface of the pilot piston 52 and the top end of the valve stem sleeve 41.

[0030] When the novel pressure control pulse valve disclosed in this utility model patent is applied, the adjusting bolt 33 is first rotated to push the spring seat 32 down, thereby pushing the pressure reducing piston 25 and pressure reducing valve rod 22 down by the first support spring 31, and finally causing the pressure reducing valve core 21 to leave the valve seat, the valve opening, and the compressed air at the air inlet 6 enters the air outlet chamber through the air inlet chamber of the pressure reducing valve chamber, and enters the air inlet port 45 of the reversing valve chamber from the air outlet chamber. At the same time, a pressure sensor is connected at the pressure detection port 10 to monitor the air outlet pressure of the pressure reducing valve section. When the pressure in the outlet chamber increases, the air pressure is fed back into the pressure reducing valve chamber through the exhaust port 26 and the flow hole 28 on the guide plate 24, pushing the pressure reducing piston 25 to move upward. The pressure reducing valve core 21 moves upward and approaches the valve seat 23 under the push of its bottom return spring until the valve is completely closed. At this time, the pressure feedback of the outlet chamber is balanced with the thrust of the first support spring 31, and the pressure in the outlet chamber is stable. That is to say, the pressure in the outlet chamber can be adjusted to the required pressure by rotating the adjusting bolt 33. After the adjusting bolt 33 is adjusted to the required pressure, the position of the adjusting bolt 33 needs to be locked with the locking nut 34, and the position of the adjusting bolt 33 needs to be locked with the lead sealing line.

[0031] Air is supplied to the pilot piston chamber 51 through the pilot air inlet 7. When the air pressure at the pilot air inlet 7 is high, the air pressure will push the pilot piston 52 to move towards the valve stem sleeve 51 against the elastic force of the second support spring 53. At the same time, the columnar protrusion 55 pushes the reversing valve stem 42 to move towards the bottom end of the reversing valve chamber against the elastic force of the return spring until the bottom end of the pilot piston 52 contacts the top end of the valve stem sleeve 41 and stops moving. At this time, the cavity on the outer periphery of the first reduced diameter section 414 of the reversing valve stem 42 connects the exhaust port 47 and the outlet port 46. The second sealing section 412 will seal and isolate the outlet port 46 from the inlet port 45, thereby connecting the exhaust port 9 and the outlet port 8. The air at the outlet port 8 is discharged from the exhaust port 9. When the air pressure at the pilot air inlet 7 is reduced, the first support spring 53, the return spring, and the air pressure at the air inlet port 45 push the reversing valve rod 42 and the pilot piston 52 to move toward the top surface of the pilot piston chamber 51 until they stop. At this time, the cavity on the outer periphery of the second diameter reduction section 415 connects the air inlet port 45 with the air outlet port 46, and the second sealing section 412 seals and isolates the air outlet port 46 from the exhaust port 47, thereby connecting the air inlet port 45 with the air outlet 8, and the gas from the pressure reducing valve enters the air outlet 8.

[0032] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A novel pressure-controlled pulse valve, the pulse valve comprising a valve body, characterized in that, The valve body includes a valve seat, on which a pressure reducing valve chamber and a reversing valve chamber are arranged side by side. A pressure reducing valve cover is coaxially fixed to the upper side of the pressure reducing valve chamber, and a pressure reducing valve assembly is disposed therein. A reversing valve cover is coaxially fixed to the upper side of the reversing valve chamber, and a reversing valve assembly is disposed therein. An air inlet and a pressure detection port are exposed at the bottom of the pressure reducing valve chamber. A pilot air inlet, an air outlet, and an exhaust port are exposed at the bottom of the valve body. The air outlet of the pressure reducing valve chamber is connected to the air inlet of the reversing valve chamber through an air passage. The air outlet of the pressure reducing valve chamber is connected to the pressure detection port.

2. The novel pressure control pulse valve according to claim 1, characterized in that, The pressure reducing valve assembly includes an adjusting bolt, a first support spring, a pressure reducing piston, and a pressure reducing valve core. The adjusting bolt is threaded into an internal threaded hole in the center of the pressure reducing valve cover. A spring seat is slidably connected to the inner cavity of the pressure reducing valve cover. The bottom end of the adjusting bolt abuts against the center of the top surface of the spring seat. The upper part of the pressure reducing valve cavity is a pressure reducing piston cavity, and the lower part is a gas flow cavity. The pressure reducing piston is slidably connected in the pressure reducing piston cavity. The upper and lower ends of the first support spring are respectively connected to the spring seat and the pressure reducing piston. A valve seat is provided in the flow cavity to divide the flow cavity into a lower section. The valve core has an intake chamber and an upper exhaust chamber. The intake chamber is connected to the intake port, and the exhaust chamber is connected to the pressure detection port and the intake end of the reversing valve chamber. A valve port is opened at the center of the valve seat. The pressure reducing valve core is coaxially arranged in the intake chamber with the valve port. The top surface of the pressure reducing valve core is a sealing disc. The diameter of the sealing disc is larger than the diameter of the valve port. A pressure reducing valve rod is assembled at the upper center of the pressure reducing valve core. The pressure reducing valve rod passes through the valve port coaxially, and its top end passes upward into the pressure reducing piston chamber and abuts against the center of the bottom surface of the pressure reducing piston. The exhaust chamber is provided with an exhaust hole that communicates with the pressure reducing piston chamber.

3. A novel pressure control pulse valve according to claim 2, characterized in that, A guide plate is fixed to the center of the bottom surface of the pressure reducing piston chamber by a retaining ring through a hole. A guide hole is opened at the center of the guide plate. The top end of the pressure reducing valve rod extends into the pressure reducing piston chamber through the guide hole. The guide plate also has multiple flow holes on the radial outer side of the guide hole.

4. A novel pressure control pulse valve according to claim 3, characterized in that, An axially penetrating overflow hole is opened at the center of the pressure reducing piston, and a sealing gasket is provided at the bottom opening of the overflow hole. When the bottom surface of the pressure reducing piston abuts against the pressure reducing valve rod, the top surface of the pressure reducing valve rod can seal the overflow hole. A pressure relief hole is opened on the side of the pressure reducing valve cover.

5. A novel pressure control pulse valve according to claim 4, characterized in that, A limiting groove is formed at the bottom center of the pressure reducing valve cavity. The bottom of the pressure reducing valve core is slidably connected in the limiting groove. The top opening of the limiting groove is sealed by a gasket and a small K-type sealing ring. The inside of the pressure reducing valve core is a hollow structure. A return spring is provided between the inside of the core and the bottom surface of the limiting groove. The lower half of the pressure reducing valve stem has a through cavity that communicates with the hollow cavity inside the pressure reducing valve core. The through cavity inside the pressure reducing valve stem has an opening in the middle of the pressure reducing valve stem.

6. A novel pressure control pulse valve according to claim 5, characterized in that, A locking nut is threaded onto the adjusting bolt, and the locking nut is located on the outside of the pressure reducing valve cover.

7. A novel pressure control pulse valve according to claim 6, characterized in that, The pressure reducing valve cover has internally threaded screw holes at the pressure relief holes. There are multiple pressure relief holes, which are symmetrically distributed around the radial periphery of the screw holes. An overflow washer and a sealing plate are fixed at the screw holes by threaded semi-circular head screws. The sealing plate can completely cover the surrounding pressure relief holes.

8. A novel pressure control pulse valve according to claim 7, characterized in that, A valve stem sleeve is fixed in the reversing valve chamber. A reversing valve stem is slidably connected to the center of the valve stem sleeve. An exhaust port, an outlet port, and an inlet port are sequentially arranged along the axial direction on the valve stem sleeve. The exhaust port is connected to the exhaust port, the outlet port is connected to the outlet port, and the inlet port is connected to the outlet chamber of the pressure reducing valve chamber. Two reduced-diameter sections are arranged at intervals in the middle of the reversing valve stem, forming a first sealing section, a second sealing section, and a third sealing section sequentially on the reversing valve stem. The interior of the reversing valve cover is a pilot piston chamber. A pilot piston is slidably connected in the pilot piston chamber. An opening is provided at the top of the side wall of the pilot piston chamber, connecting to the pilot air inlet. The pilot piston is in the shape of an inverted cup, with a columnar protrusion formed downward at the axial center of its top surface. The bottom end of the columnar protrusion abuts against the top end of the reversing valve stem. A second support spring is provided inside the pilot piston, and the two ends of the second support spring are respectively connected to the top surface of the pilot piston and the top end of the valve stem sleeve.

9. A novel pressure control pulse valve according to claim 8, characterized in that, The bottom surface of the valve seat has a through internal thread hole corresponding to the axis of the reversing valve chamber, and an adjusting bolt is threaded into the through internal thread hole.

10. A novel pressure control pulse valve according to claim 9, characterized in that, A buffer pad is fixed on the top surface of the pilot piston chamber of the reversing valve cover. Filter elements are respectively provided at the air inlet and the pilot air inlet. An exhaust muffler is provided at the exhaust port. A large K-shaped sealing ring is embedded in the outer periphery of the pressure reducing piston and the pilot piston for sealing.

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