A speed switching valve with stroke indication

Abstract

The present invention relates to switching valves, specifically a speed switching valve with a stroke indicator. This speed switching valve with a stroke indicator is characterized by comprising a valve body, a valve core assembly disposed within the valve body, the valve core assembly being connected to a stroke indicator, and the stroke indicator extending outside the valve body. The present invention offers significant advantages: high reliability, simple structure, easy operation, and high maintainability.

Description

Technical Field

[0001] The invention belongs to a switching valve, and in particular relates to a speed switching valve with a stroke indicator. Background Art

[0002] The speed switching valve is used to switch between the fast-closing and slow-closing functions of a quick-closing valve driver. Currently, quick-closing valve drivers still utilize a large-diameter valve and a small-diameter valve connected in parallel, controlled by two solenoid valves. This approach results in a complex control circuit, numerous leaks, and a non-compact structure. The present invention integrates these two functions into a single valve, offering the following key advantages: high reliability, simple structure, easy operation, and enhanced maintainability. Summary of the Invention

[0003] The present invention aims to solve the defects of the prior art and provide a speed switching valve with a stroke indicator.

[0004] The present invention is implemented as follows: a speed switching valve with a stroke indicator, characterized in that it includes a valve body, a valve core assembly is arranged in the valve body, the valve core assembly is connected to the stroke indicator, and the stroke indicator extends out of the valve body.

[0005] As described above, in a speed switching valve with a stroke indicator, the valve core assembly includes a sliding valve core and a spring sleeved on the sliding valve core, and the spring is also sleeved outside the portion of the stroke indicator provided in the valve body.

[0006] As described above, a speed switching valve with a stroke indicator is provided, wherein a spring chamber flange is provided at the top of the valve body, the spring chamber flange is fixedly connected to the valve body, and the spring chamber flange is provided with a through hole, through which the stroke indicator extends out of the valve body.

[0007] In the speed switching valve with stroke indication as described above, a pressure control chamber flange is provided at the bottom end of the valve body, and the pressure control chamber flange is fixedly connected to the valve body.

[0008] As described above, a speed switching valve with a stroke indication, wherein the pressure control chamber flange, the sliding valve core and the valve body form a closed pressure control chamber, a control oil circuit is provided on the side wall of the valve body, and the control oil circuit is connected to the above-mentioned pressure control chamber for controlling the inflow and outflow of oil.

[0009] As described above, a speed switching valve with a stroke indicator, wherein the spring chamber flange, the sliding valve core and the valve body form a closed spring chamber, and a balancing oil port is provided on the side wall of the valve body, and the balancing oil port is connected to the spring chamber for balancing the inflow and outflow of oil.

[0010] As described above, a speed switching valve with stroke indication is provided, wherein a throttle port, an O-ring and a retaining ring thereof are provided between the spool of the sliding valve and the inner wall of the valve body.

[0011] The present invention has the following significant advantages: 1. High reliability. The speed switching valve adopts a sliding valve structure, which enables rapid and precise switching and good guidance. An O-ring is installed on the outer circumference of the sliding valve core on the high-pressure control chamber side, isolating the high-pressure control chamber from the discharge chamber. Retaining rings are also provided on both sides of the O-ring to prevent the O-ring from being squeezed out during the movement of the sliding valve core, thus achieving a good sealing effect. A travel indicator is also provided inside the speed switching valve to effectively monitor the speed switching valve status and ensure that the gas-liquid linkage drive device is in the required operating state.

[0012] 2. Simple structure and easy operation. The main components of the speed switching valve include the valve body, spool, spring, flange, and travel indicator. The working principle is simple, and the parts are easy to manufacture and assemble. The operation method only requires controlling the on-off of the high-pressure control chamber system oil circuit to switch the speed switching valve's operation function, with a low risk of failure.

[0013] 3. High maintainability. The speed switching valve has high reliability, simple structure and operation scheme. During online maintenance, the upstream oil drain circuit needs to be cut off and the control oil circuit solenoid valve must be in the de-energized state. The spring chamber flange or the high-pressure control chamber flange can then be opened to inspect the speed switching valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Speed ​​switching valve quickly closes the valve state;

[0015] Figure 2 Speed ​​switching valve slowly closing valve state;

[0016] In the figure: 1. Travel indicator; 2. Spring chamber flange; 3. Equalizing oil port; 4. Spring; 5. Spool valve core; 6. Throttle port; 7. O-ring and retaining ring; 8. High-pressure control chamber flange; 9. Control oil circuit. DETAILED DESCRIPTION

[0017] The purpose of this application is to provide a speed switching valve with a stroke indicator. The main advantages of the structure are: high reliability; simple structure, easy operation; and high maintainability.

[0018] It is used to switch between the fast-closing and slow-closing functions of a quick-closing valve actuator. Located in the actuator's oil discharge circuit, the speed switching valve switches between fast and slow closing by adjusting the oil discharge channel's diameter. It also features a travel indicator to indicate the valve's status. The speed switching valve is a spool valve structure. Its main components include the valve body, spool, spring, flange, and travel indicator. Structurally, it is divided into three chambers: the spring chamber, the discharge chamber, and the high-pressure control chamber. When the speed switching valve is in a free state, that is, when the high-pressure control chamber is without pressure, it is a large-diameter channel. In this state, the drive device can perform the rapid valve closing function, and the spring force always acts on the valve core, so that the speed switching valve can always maintain a large-diameter channel; when the speed switching valve control oil circuit solenoid valve is opened, the system hydraulic oil enters the high-pressure control chamber through the control oil circuit, pushing the slide valve core to the other side, compressing the spring while the slide valve core reaches the limit position, the stroke indicator contacts are closed, the discharge chamber is switched to the throttle channel, and the speed switching valve completes the switch from the rapid valve closing function to the slow valve closing function. When the high-pressure control chamber loses pressure, the slide valve core can be automatically reset with the help of spring force.

[0019] It features high reliability. The speed switching valve is a spool valve structure, offering fast, precise switching and excellent guidance. An O-ring is located on the outer periphery of the spool valve core on the high-pressure control chamber side, isolating the high-pressure control chamber from the discharge chamber. Retaining rings are located on either side of the O-ring to prevent extrusion of the O-ring during movement of the spool valve, ensuring a good sealing effect. A travel indicator is also located inside the speed switching valve to effectively monitor its status and ensure the gas-liquid linkage drive is in the desired operating state.

[0020] It features a simple structure and easy operation. The speed switching valve's main components include a valve body, spool, spring, flange, and travel indicator. Its operating principle is simple, and its components are easy to manufacture and assemble. Operation requires only opening and closing the high-pressure control chamber system oil circuit to switch the speed switching valve's function, minimizing the risk of failure.

[0021] It has the characteristics of high maintainability. The speed switching valve has high reliability, simple structure and operation scheme. During online maintenance, it is necessary to cut off the upstream oil drain circuit and ensure that the control oil circuit solenoid valve is in the power-off state. Then, the spring chamber flange or the high-pressure control chamber flange can be opened to inspect the speed switching valve.

[0022] The above structure can bring the following effects:

[0023] 1. High reliability. The speed switching valve is a spool valve, offering fast, precise switching and excellent guidance. An O-ring is installed on the outer diameter of the spool valve core on the high-pressure control chamber side, isolating the high-pressure control chamber from the discharge chamber. Retaining rings are installed on both sides of the O-ring to prevent the O-ring from being squeezed out during the movement of the spool valve core, ensuring a good sealing effect. A stroke indicator is also installed inside the speed switching valve to effectively monitor the speed switching valve status and ensure that the gas-liquid linkage drive device is in the required operating state.

[0024] 2. Simple structure and easy operation. The main components of the speed switching valve include the valve body, spool, spring, flange, and travel indicator. The working principle is simple, and the parts are easy to manufacture and assemble. The operation method only requires controlling the on-off of the high-pressure control chamber system oil circuit to switch the speed switching valve's operation function, with a low risk of failure.

[0025] 3. High maintainability. The speed switching valve has high reliability, simple structure and operation scheme. During online maintenance, the upstream oil drain circuit needs to be cut off and the control oil circuit solenoid valve must be in the de-energized state. The spring chamber flange or the high-pressure control chamber flange can then be opened to inspect the speed switching valve.

Claims

1. A speed switching valve with stroke indication, characterized in that: The valve comprises a valve body, a valve core assembly is arranged in the valve body, the valve core assembly is connected to a stroke indicator (1), and the stroke indicator (1) extends out of the valve body; The valve core assembly comprises a sliding valve core (5) and a spring (4) sleeved on the sliding valve core (5), and the spring (4) is also sleeved outside the portion of the stroke indicator (1) disposed in the valve body; A spring chamber flange (2) is provided at the top of the valve body, the spring chamber flange (2) is fixedly connected to the valve body, and a through hole is provided in the spring chamber flange (2), through which the stroke indicator (1) extends out of the valve body; A high-pressure control chamber flange (8) is provided at the bottom end of the valve body, and the high-pressure control chamber flange (8) is fixedly connected to the valve body; The high-pressure control chamber flange (8), the sliding valve core (5) and the valve body form a sealed high-pressure control chamber, and a control oil circuit (9) is provided on the side wall of the valve body. The control oil circuit (9) is connected to the high-pressure control chamber and is used to control the inflow and outflow of oil. The spring chamber flange (2), the sliding valve core (5) and the valve body form a closed spring chamber, and a balancing oil port (3) is provided on the side wall of the valve body. The balancing oil port (3) is communicated with the spring chamber for balancing the inflow and outflow of oil. A throttle port (6), an O-ring and a retaining ring (7) are provided between the slide valve core (5) and the inner wall of the valve body; When the speed switching valve control oil circuit solenoid valve is opened, the system hydraulic oil enters the high-pressure control chamber through the control oil circuit, pushing the spool of the sliding valve to the other side. While compressing the spring, the spool of the sliding valve reaches the limit position, the stroke indicator contacts are closed, the discharge chamber is switched to the throttle channel, and the speed switching valve completes the switch from the fast closing valve function to the slow closing valve function. When the high-pressure control chamber loses pressure, the spool of the sliding valve can be automatically reset with the help of spring force.

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