A speed control valve

Abstract

The utility model discloses a speed control valve, including pilot valve and pressure relief valve, the pressure relief valve includes the casing, be equipped with the first connecting mouth on the casing, and still be equipped with the valve body in the casing, the inside of valve body is equipped with first chamber, second chamber and third chamber, be equipped with push rod in first chamber, and still be equipped with sealing ring on the push rod, second chamber is connected intercommunication through the air hole of being equipped with first connecting mouth, still be equipped with valve clack in third chamber, through push rod downshift, to make sealing ring and valve clack synchronous downshift, until first chamber, second chamber and third chamber intercommunication, guide airflow to enter into first chamber, and export through first chamber. Through pressing push rod, make sealing ring on push rod on -off three chambers, so that make the residual pressure in the pressure relief valve can through the intercommunication of three chambers and discharge residual pressure. The equipment can discharge residual pressure, to solve the adverse effect that residual pressure causes to equipment.

Description

Technical Field

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

[0002] Based on our company's previously developed patented product, with publication number CN212718582U, although it has advantages such as mid-operation stop function and convenient tube connection, residual gas (commonly known as residual pressure) often remains inside the equipment during application. Due to the presence of residual pressure, the frictional resistance of the valve core or piston is increased, resulting in sluggish operation. Long-term operation will accelerate the aging of seals and cause leakage problems. Utility Model Content

[0003] The purpose of this invention is to provide a speed control valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a speed control valve, including a pilot valve and a pressure relief valve; the pressure relief valve includes a housing, a first connection port on the housing, and a valve body inside the housing; the valve body has a first chamber, a second chamber, and a third chamber that are interconnected; a push rod is provided in the first chamber, and a sealing ring for cutting off the communication between the first chamber and the third chamber is provided on the push rod; the second chamber is connected to the first connection port through a vent, and a valve disc is provided in the third chamber; by moving the push rod downward, the sealing ring and the valve disc move downward synchronously until the first chamber, the second chamber, and the third chamber are connected, guiding airflow into the first chamber and discharging it outward through the first chamber.

[0005] As a preferred technical solution of this utility model: the third chamber is further provided with a first spring and a bracket, and the bracket is connected to the inner wall of the third chamber so as to cause the other end of the first spring to push the valve disc to reset.

[0006] As a preferred technical solution of this utility model: a second spring is also provided in the first chamber, and the push rod is reset by means of the second spring.

[0007] As a preferred technical solution of this utility model: the pilot valve is provided with a piston and a push rod that are linked to the piston; the pilot valve is also provided with a second connection port, and the airflow is guided through the second connection port to cause the piston to slide upward in the pilot valve.

[0008] As a preferred technical solution of this utility model: the upper end of the valve body is provided with a buckle and an installation groove for installing a sealing element; after one end of the valve body passes through the housing, it is connected to the inner wall of the pilot valve by means of the buckle, and the connection between the pilot valve and the valve body is sealed by the sealing element in the installation groove.

[0009] As a preferred technical solution of this utility model: the buckle ring is provided on the valve body; wherein, after the buckle ring is connected to the pilot valve, the pilot valve rotates on the valve body, and the pilot valve is also provided with an exhaust hole.

[0010] The beneficial effects of this utility model by adopting the above technical solution are as follows: by pressing the push rod, the sealing ring on the push rod is made to connect the three chambers, so that the residual pressure inside the pressure relief valve can be discharged through the connection of the three chambers. Based on this, the device can discharge the residual pressure to solve the adverse effects of residual pressure on the device. Attached Figure Description

[0011] Figure 1 This is a schematic cross-sectional view of the present invention under normal conditions; Figure 2 This is a schematic diagram of the present invention in the state of pressure release; Figure 3 This is a cross-sectional structural diagram of the pressure relief valve of this utility model; Figure 4 This is an exploded view of the pressure relief valve of this utility model; Figure 5 This is a schematic diagram of the main structure of the valve body of this utility model; Figure 6 This is a schematic cross-sectional view of the decomposed pressure relief valve and pilot valve of this utility model.

[0012] In the diagram: 1. Pilot valve; 2. Vent port; 3. Pressure relief valve; 30. Housing; 31. First chamber; 32. Push rod; 33. Second chamber; 34. Third chamber; 35. Valve body; 36. First connection port; 37. Air vent; 38. Sealing ring; 39. Bracket; 310. Valve disc; 311. First spring; 312. Second spring; 313. Inverted clip; 314. Mounting groove; 4. Second connection port; 5. Push rod; 6. Piston. Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model.

[0014] Please see Figure 1-6 This utility model provides an embodiment of a speed control valve, including a pilot valve 1 and a pressure relief valve 3. The pressure relief valve 3 includes a housing 30, a first connection port 36 on the housing 30, and a valve body 35 inside the housing 30. The valve body 35 has a first chamber 31, a second chamber 33, and a third chamber 34 that are interconnected. The first chamber 31 has a push rod 32, and the push rod 32 has a sealing ring 38 for cutting off the communication between the first chamber 31 and the third chamber 34. The second chamber 33 is connected to the first connection port 36 through a vent 37, and the third chamber 34 has a valve disc 310. By moving the push rod 32 downward, the sealing ring 38 and the valve disc 310 move downward synchronously until the first chamber 31, the second chamber 33, and the third chamber 34 are connected, guiding airflow into the first chamber 31 and outward through the first chamber 31.

[0015] In summary, by pressing the push rod 32, the sealing ring 38 on the push rod 32 is forced to open the three chambers. Specifically, the sealing ring 38 moves with the push rod 32 to the air hole 37. At this time, the valve disc 310 also moves downward, and the three chambers are fully connected. At this time, the gas can flow upward along the inner wall of the three chambers. It should be noted that the diameter of the push rod 32 located in the second chamber 33 is smaller than the inner diameter of the second chamber 33. When the sealing ring 38 enters the second chamber 33, it completes the seal between the push rod 32 and the facing surfaces of the second chamber 33. Based on this, the device can discharge residual pressure to solve the adverse effects of residual pressure on the equipment.

[0016] After the residual pressure is discharged, the third chamber 34 is further equipped with a first spring 311 and a bracket 39, and the bracket 39 is connected to the inner wall of the third chamber 34 to cause the other end of the first spring 311 to push the valve disc 310 to reset. Therefore, the first spring 311 can be used to reset the valve disc 310 and cut off the communication between the second chamber 33 and the third chamber 34. At the same time, the first chamber 31 is also equipped with a second spring 312, and the push rod 32 is reset through the second spring 312. Thus, after the residual pressure is discharged, the sealing ring 38 cuts off the communication between the first chamber 31 and the third chamber 34.

[0017] In summary, by utilizing the cooperation of the first spring 311 and the second spring 312, the push rod 32 and the valve disc 310 can automatically reset after the external force disappears, thus ensuring the normal operation of the equipment.

[0018] Based on the above scheme, the pilot valve 1 is equipped with a piston 6 and a push rod 5 that is linked to the piston 6; the pilot valve 1 is also equipped with a second connection port 4, through which airflow is guided to cause the piston 6 to slide upward within the pilot valve 1. Therefore, when the air source enters through the second connection port 4, it pushes the push rod 5 and the piston 6 to move downward synchronously. At this time, the push rod 32 also moves downward with the push rod 5. When the push rod 32 moves downward, it pushes the valve disc 310 downward, at which point the third chamber 34 is connected to the first connection port 36. It should be noted that when the upper end face of the piston 6 abuts against the upper end face of the valve body 35, the sealing ring 38 on the push rod 32 does not enter the air hole 37 to avoid automatic pressure relief. When it is necessary to release residual pressure, the push rod 5 is pushed downward after the piston 6 abuts against the upper end of the valve body 35, until the sealing ring 38 enters the air hole 37, thus achieving pressure relief. Based on this, in addition to performing the pilot function, the pilot valve 1 can still achieve manual pressure relief by moving the push rod 5.

[0019] To facilitate the connection and assembly of the pilot valve 1 and the pressure relief valve 3, the upper end of the valve body 35 is provided with a buckle 313 and a mounting groove 314 for installing a seal. After one end of the valve body 35 passes through the housing 30, it is connected to the inner wall of the pilot valve 1 by the buckle 313, and the connection between the pilot valve 1 and the valve body 35 is sealed by the seal in the mounting groove 314.

[0020] Furthermore, since the buckle 313 is annularly mounted on the valve body 35, and the pilot valve 1 rotates on the valve body 35 after the buckle 313 is connected to the pilot valve 1, the position of the pilot valve 1 can be freely adjusted during use. Even further, since the pilot valve 1 is also provided with a vent hole 2, residual pressure can be discharged through the vent hole 2.

[0021] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A speed control valve, characterized in that: It includes a pilot valve (1) and a pressure relief valve (3); the pressure relief valve (3) includes a housing (30), a first connection port (36) is provided on the housing (30), and a valve body (35) is also provided inside the housing (30); The valve body (35) has a first chamber (31), a second chamber (33) and a third chamber (34) that are interconnected inside. The first chamber (31) is provided with a push rod (32), and the push rod (32) is also provided with a sealing ring (38) for cutting off the communication between the first chamber (31) and the third chamber (34). The second chamber (33) is connected to the first connection port (36) through a provided air hole (37), and the third chamber (34) is also provided with a valve disc (310). By moving the push rod (32) downward, the sealing ring (38) and the valve disc (310) move downward synchronously until the first chamber (31), the second chamber (33) and the third chamber (34) are connected, guiding the airflow into the first chamber (31) and outward through the first chamber (31).

2. The speed control valve according to claim 1, characterized in that: The third chamber (34) is also provided with a first spring (311) and a bracket (39), and the bracket (39) is connected to the inner wall of the third chamber (34) so ​​as to cause the other end of the first spring (311) to push the valve disc (310) to reset.

3. A speed control valve according to claim 2, characterized in that: The first chamber (31) is also provided with a second spring (312), and the push rod (32) is reset by the second spring (312).

4. A speed control valve according to claim 1, 2, or 3, characterized in that: The pilot valve (1) is provided with a piston (6) and a push rod (5) that is linked to the piston (6); the pilot valve (1) is also provided with a second connection port (4), and the airflow is guided through the second connection port (4) to cause the piston (6) to slide upward in the pilot valve (1).

5. A speed control valve according to claim 4, characterized in that: The upper end of the valve body (35) is provided with a buckle (313) and a mounting groove (314) for installing a seal; after one end of the valve body (35) passes through the housing (30), it is connected to the inner wall of the pilot valve (1) by the buckle (313), and the connection between the pilot valve (1) and the valve body (35) is sealed by the seal in the mounting groove (314).

6. A speed control valve according to claim 1, characterized in that: An inverted buckle (313) is provided on the valve body (35); wherein, after the inverted buckle (313) is connected to the pilot valve (1), the pilot valve (1) rotates on the valve body (35), and the pilot valve (1) is also provided with an exhaust port (2).

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