Full-automatic hydraulic control valve

Abstract

The utility model discloses a full-automatic hydraulic control valve, which relates to the technical field of industrial valves, aims to solve the problem of short service life of a large-diameter high-pressure valve for a nodular cast iron pipe hydrostatic test, and comprises a valve body, a valve cover connected with the top of the valve body through a bolt, and a hydraulic cylinder mounted at the top of the valve cover, a connecting rod is installed at the bottom of the hydraulic cylinder and penetrates through the valve deck to extend into a cavity of the valve body, a valve element is installed at the bottom of the connecting rod, a guide sleeve is installed on the inner wall of the valve body, a low-pressure valve sleeve is installed at the bottom of the guide sleeve through a bolt, and a high-pressure water inlet is reserved in the valve deck. According to the nodular cast iron pipe, the selected manufacturing raw materials are high in strength and good in corrosion resistance effect, and by combining the well-designed structure, it is ensured that the stability and reliability of the nodular cast iron pipe can still be kept in the production process even under the strict requirements for high pressure, high frequency and sealing and in the high-frequency use and severe working environment.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial valves, and particularly relates to a full-automatic hydraulic control valve. Background Technique

[0002] With the acceleration of the production rhythm of ductile iron pipes and the increase of pipe diameter pressure, traditional high-pressure valves can no longer meet the requirements of modern hydraulic pressure tests. When facing a test pressure of up to 5.0 Mpa, these valves often seem inadequate, and their sealing performance and service life are difficult to guarantee. Especially in the case of frequent opening and closing and long-term exposure to high-pressure water flow, the performance of traditional valves decays faster, and the maintenance frequency and cost also increase accordingly. This not only affects the stability and efficiency of the ductile iron pipe production line but also increases the operating cost of the enterprise. Therefore, there is an urgent need for a valve with a long service life, less maintenance, and excellent sealing performance to replace traditional high-pressure valves to meet the requirements of modern ductile iron pipe production, reduce maintenance costs, and improve production stability. Content of the Utility Model

[0003] To solve the above problems, that is, to solve the problems proposed in the above background technique, the utility model proposes a full-automatic hydraulic control valve, which includes a valve body. The top of the valve body is connected with a valve cover through bolts. A hydraulic cylinder is installed on the top of the valve cover. A connecting rod is installed at the bottom of the hydraulic cylinder. The connecting rod passes through the valve cover and extends into the cavity of the valve body. A valve core is installed at the bottom of the connecting rod. A guide sleeve is installed on the inner wall of the valve body. A low-pressure valve sleeve is installed at the bottom of the guide sleeve through bolts. A high-pressure water inlet is reserved on the valve cover.

[0004] A further setting of the utility model is that one side of the valve body is connected with a hydraulic press connecting pipe, and a low-pressure water inlet is opened at the bottom of the valve body.

[0005] A further setting of the utility model is that a pressure transmitter interface is opened on the hydraulic press connecting pipe.

[0006] A further setting of the utility model is that a plurality of water inlets are arranged on the guide sleeve.

[0007] A further setting of the utility model is that the joint surface between the valve core and the low-pressure valve sleeve is a mechanical seal, and the seal is a 90° conical surface.

[0008] The beneficial technical effect of the utility model is that the selected raw materials for production have high strength and good corrosion resistance. Combined with the carefully designed structure, it ensures that during the production of ductile iron pipes, even under the harsh requirements of high pressure, high frequency, and sealing, as well as in high-frequency use and harsh working environments, it can still maintain its stability and reliability. This device not only has a long service life and less maintenance but also significantly improves the production rhythm and automation degree of the hydraulic press equipment. Description of the Drawings

[0009] Figure 1 The structural schematic diagram of the present utility model is shown.

[0010] Reference numerals in the drawings: 1. valve cover, 2. valve body, 3. guide sleeve, 4. connecting rod, 5. valve core, 6. low-pressure valve sleeve, 7. hydraulic cylinder, 8. high-pressure water inlet, 9. hydraulic press connecting pipe, 10. low-pressure water inlet, 11. pressure transmitter interface. Detailed Embodiment

[0011] The following will refer to the attached Figure 1 to describe the preferred embodiments of the present utility model. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0012] The present utility model provides a fully automatic hydraulic control valve. A valve cover 1 is connected to the top of a valve body 2 by bolts. A hydraulic cylinder 7 is installed on the top of the valve cover 1. A connecting rod 4 is installed at the bottom of the hydraulic cylinder 7 and is used to connect the valve core 5 and the hydraulic cylinder 7 to play a connecting role. The connecting rod 4 passes through the valve cover 1 and extends into the cavity of the valve body 2. A valve core 5 is installed at the bottom of the connecting rod 4 to drive the hydraulic cylinder 7. The valve core 5 is driven by the connecting rod 4 to move up and down. The valve core 5 presses on the low-pressure valve sleeve 6 to play a sealing role. The materials of the valve core 5 and the low-pressure valve sleeve 6 are selected as 3Cr13, with a quenching and tempering treatment of HB241 - 286 and a surface quenching of HRC45 - 50. A guide sleeve 3 is installed on the inner wall of the valve body 2 to guide the valve core 5 to achieve accurate positioning and sealing effect. The low-pressure valve sleeve 6 is installed at the bottom of the guide sleeve 3 by bolts and closely cooperates with the valve core 5 to play a sealing role. The low-pressure valve sleeve 6 can be replaced as a vulnerable part without the need to replace the whole valve. A high-pressure water inlet 8 is reserved on the valve cover 1. High-pressure water is injected through the high-pressure water inlet 8 on the valve cover 1, which facilitates the injection of high-pressure water. One side of the valve body 2 is connected with a hydraulic press connecting pipe 9, and a low-pressure water inlet 10 is opened at the bottom of the valve body 2. A pressure transmitter interface 11 is opened on the hydraulic press connecting pipe 9, and the pressure transmitter interface 11 can also be opened on the valve cover 1 to facilitate connection with the pressure transmitter. A plurality of water inlets are arranged on the guide sleeve 3 to facilitate the entry of high- and low-pressure water into the hydraulic press connecting pipe 9.

[0013] This device can be installed on the side wall of a hydraulic press. For ductile iron pipes with a small diameter of DN100, a hydraulic press should produce at least 60 pipes per hour at one station, operate for 24 hours a day, with the valve working 1440 times a day and 10080 times a week. For ordinary valves, their service life can only meet the use for about one week and cannot meet long-term use. The service life of this device is more than 100,000 times. Since the sealing joint surface between the valve core 5 and the low-pressure valve sleeve 6 is a mechanical seal, and the seal is a 90° conical surface, even if there is wear, it does not affect the sealing effect, but only increases the use stroke of the hydraulic cylinder 7.

[0014] Working principle:

[0015] When the hydraulic cylinder 7 rises, low-pressure water smoothly flows into the cavity of the valve body 2. At the same time, air is discharged from the exhaust hole on one side of the ductile iron pipe to be tested. With the continuous injection of low-pressure water, when the low-pressure water is full and water starts to flow out from the water inlet on the guide sleeve 3, the pressure transmitter detects that the pressure reaches 0.2 MPa. At this time, the control system will command to close the water inlet.

[0016] Subsequently, the hydraulic cylinder 7 descends, driving the valve core 5 to tightly press against the low-pressure valve sleeve 6, thus achieving the sealing effect and ensuring that the low-pressure water cannot flow back. Immediately afterwards, high-pressure water is injected through the high-pressure water inlet 8. When the pressure transmitter shows that the pressure reaches 5 MPa, the injection of high-pressure water stops, and the system enters the pressure-holding stage, maintaining the pressure for 10 - 15 seconds to complete the entire hydraulic pressure test process.

[0017] After the test is completed, the exhaust hole on one side of the ductile iron pipe is opened again to release the pressure inside the pipe. Subsequently, the synchronous beam starts to work, transports the tested ductile iron pipe away, and prepares the next ductile iron pipe to be tested for the next cycle test. After the entire process is optimized, it is more smooth and fluent, ensuring the accuracy and efficiency of the test.

[0018] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

[0019] In the description of the present utility model, terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article, or device / equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in these processes, articles, or devices / equipment.

[0022] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A fully automatic hydraulically controlled valve, comprising a valve body (2), characterized in that: The top of the valve body (2) is connected to a valve cover (1) by bolts, a hydraulic cylinder (7) is installed on the top of the valve cover (1), a connecting rod (4) is installed on the bottom of the hydraulic cylinder (7), the connecting rod (4) passes through the valve cover (1) and extends into the cavity of the valve body (2), a valve core (5) is installed on the bottom of the connecting rod (4), a guide sleeve (3) is installed on the inner wall of the valve body (2), a low-pressure valve sleeve (6) is installed on the bottom of the guide sleeve (3) by bolts, and a high-pressure water inlet (8) is reserved on the valve cover (1).

2. A fully automatic hydraulically controlled valve according to claim 1, characterized in that: One side of the valve body (2) is connected to a hydraulic press pipe (9), and a low-pressure water inlet (10) is provided at the bottom of the valve body (2).

3. A fully automatic hydraulically controlled valve according to claim 2, characterized in that: The hydraulic press pipe (9) is provided with a pressure transmitter interface (11).

4. A fully automatic hydraulically controlled valve according to claim 1, characterized in that: The guide sleeve (3) is provided with a plurality of water inlets.

5. A fully automatic hydraulically controlled valve according to claim 1, characterized in that: The joint surface between the valve core (5) and the low-pressure valve sleeve (6) is a mechanical seal, and the seal is a 90° conical surface.

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