A low-pressure valve pressure testing device

Abstract

This utility model relates to the technical field of valve pressure testing equipment, specifically a low-pressure valve pressure testing device. The device includes a pressure testing machine and a storage tank. A three-way valve is fixedly installed on the storage tank via a pipeline. A one-way valve is fixedly connected to the three-way valve via a pipeline. A low-pressure regulating mechanism is provided between the one-way valve and the pressure testing machine for adjusting the pressure during low-pressure testing. This utility model, by installing a low-pressure regulating mechanism, one-way valve, three-way valve, and storage tank on the pressure testing machine, adds a low-pressure testing function. Furthermore, the three-way valve allows switching between water pressure testing and air pressure testing. During water pressure testing, the pressure is controlled by the liquid level difference, which better reflects the actual practical conditions of the valve, thereby effectively improving the testing range and testing effect of the pressure testing machine.

Description

Technical Field

[0001] This utility model relates to the technical field of valve pressure testing equipment, specifically a low-pressure valve pressure testing device. Background Technology

[0002] A valve is a device used to control the flow of fluids. It plays a vital role in piping systems, opening and closing water or other fluids, regulating flow, preventing backflow or leakage, and ensuring the safe and stable operation of the system. During valve manufacturing, a sealing test is an essential step. First, close the valve to ensure it is completely closed. Then, use a water pump or air pump to introduce the appropriate medium into the valve, gradually increasing the pressure and observing the pressure gauge reading. A steady increase in pressure indicates good sealing performance; a decrease in pressure or leakage indicates a sealing problem.

[0003] However, existing valve pressure testing machines typically only have high-pressure testing capabilities. A valve's good sealing performance under high pressure does not guarantee its sealing performance under low pressure. Therefore, performing only high-pressure testing is incomplete for assessing valve sealing performance and can affect the accuracy of the assessment. In light of this, we propose a low-pressure valve pressure testing device. Utility Model Content

[0004] The purpose of this utility model is to provide a low-pressure valve testing device, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A low-pressure valve testing device includes a testing machine and a storage tank. A three-way valve is fixedly installed on the storage tank via a pipeline. A one-way valve is fixedly connected to the three-way valve via a pipeline. A low-pressure regulating mechanism is provided between the one-way valve and the testing machine for regulating the pressure during low-pressure testing.

[0007] Preferably, the low-pressure regulating mechanism includes a connecting pipe, one end of which is connected to the pressure testing machine via a valve, and the other end of which is fixedly connected to a low-pressure pipe, the bottom end of which is fixedly connected to the outlet of a one-way valve.

[0008] Preferably, a piston is slidably installed inside the low-pressure pipe, and sealing grooves are provided at both the upper and lower ends of the piston. Multiple through grooves are provided through the piston, and the sealing grooves and through grooves are connected.

[0009] Preferably, a sliding rod is slidably installed through the center of the piston, and sealing blocks are fixedly installed at both the upper and lower ends of the sliding rod. The sealing blocks are adapted to the sealing groove, and the length of the sliding rod is greater than the height of the piston.

[0010] Preferably, a plurality of friction rings are fixedly mounted on the surface of the piston, and the surface of the friction rings is in contact with the inner wall of the low-pressure pipe.

[0011] Preferably, a rotating seat is rotatably mounted on the top end of the low-pressure pipe, a drive gear is meshed on the rotating seat, a motor is fixedly connected to the drive gear, and a lead screw is threaded through the rotating seat.

[0012] Preferably, multiple ventilation holes are provided through the rotating seat, and the lead screw is fixedly connected to the sealing block.

[0013] By employing the above technical solution, this utility model provides a low-pressure valve testing device that has at least the following beneficial effects:

[0014] (1) By installing a low-pressure regulating mechanism, a one-way valve, a three-way valve and a liquid storage tank on the pressure testing machine, this utility model can add a low-pressure test function to the pressure testing machine. The water pressure test and air pressure test can be switched by switching the three-way valve. At the same time, when performing water pressure test, the pressure is controlled by the liquid level difference, which is more in line with the actual practical situation of the valve. Thus, the pressure testing range and pressure testing effect of the pressure testing machine can be effectively improved. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of the low-pressure regulating mechanism of this utility model;

[0018] Figure 3 This is an enlarged view of the rotating base and the driving gear of this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the low-pressure pipe of this utility model;

[0020] Figure 5 This is a structurally disassembled schematic diagram of the piston and its connecting parts according to this utility model.

[0021] In the diagram: 1. Testing machine; 2. Pressure gauge; 3. Clamping seat; 4. Liquid storage tank; 5. Low-pressure regulating mechanism; 6. Check valve; 7. Three-way valve;

[0022] 51. Connecting pipe; 52. Low-pressure pipe; 53. Rotating seat; 54. Drive gear; 55. Vent hole; 56. Lead screw; 57. Piston; 58. Friction ring; 59. Sealing groove; 510. Through groove; 511. Sliding rod; 512. Sealing block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-5 A low-pressure valve testing device includes a testing machine 1 and a storage tank 4. The testing machine 1 can be used for valve sealing testing under high pressure. The testing machine 1 includes a pressure gauge 2 and a clamping seat 3. The clamping seat 3 is used to fix the valve and perform pressure testing on the valve. The pressure gauge 2 is used to monitor the internal pressure and pressurization of the valve in real time during the pressure test. The storage tank 4 is used to store water for low-pressure testing.

[0025] A low-pressure regulating mechanism 5 is installed between the liquid storage tank 4 and the pressure testing machine 1 to regulate the pressure during low-pressure testing. The low-pressure is adjusted by the height of the water column, thereby measuring the valve's sealing performance under both natural and normal operating low-pressure conditions. This simple mechanical structure adds low-pressure testing functionality to the pressure testing machine 1, effectively enhancing the applicability of the device.

[0026] Please see Figures 2-5 The low-pressure regulating mechanism 5 includes a connecting pipe 51. One end of the connecting pipe 51 is connected to the pressurization inlet pipe of the pressure testing machine 1 via a valve. Switching between low-pressure and high-pressure tests of the pressure testing machine 1 can be achieved by switching the valve. The other end of the connecting pipe 51 is fixedly connected to the bottom end of the low-pressure pipe 52. The bottom end of the low-pressure pipe 52 is also fixedly connected to a one-way valve 6 via a pipe. A three-way valve 7 is fixedly installed on the one-way valve 6 via a pipe. The three-way valve 7 is connected to a liquid storage tank 4 via a pipe. The last port of the three-way valve 7 is connected to the outside air.

[0027] The three-way valve 7 connects to the liquid storage tank 4, thereby connecting the liquid storage tank 4, the one-way valve 6, and the low-pressure pipe 52. This allows the liquid in the liquid storage tank 4 to enter the low-pressure pipe 52 through the three-way valve 7 and the one-way valve 6, and then fill the valve body and the low-pressure pipe 52 through the low-pressure pipe 52 and the connecting pipe 51. Because the one-way valve 6 provides one-way connectivity, the low-pressure pipe 52, the connecting pipe 51, and the detection valve are in a sealed state, allowing for a watertightness test of the valve.

[0028] The three-way valve 7 connects to the outside air, allowing air to be introduced into the valve to be tested through the one-way valve 6 and the low-pressure pipe 52. The low-pressure pipe 52, the connecting pipe 51 and the test valve are in a sealed state, which allows for airtightness testing of the valve.

[0029] A rotating seat 53 is rotatably mounted on the top end of the low-pressure pipe 52. Multiple teeth are formed on the surface of the rotating seat 53, which meshes with a drive gear 54 via these teeth. A motor is fixedly connected to the drive gear 54. The motor drives the drive gear 54 to rotate, which in turn drives the rotating seat 53 to rotate. Multiple vent holes 55 are formed through the rotating seat 53, arranged in an array, for communication between the inside and outside of the low-pressure pipe 52.

[0030] The rotating seat 53 is threadedly connected to a lead screw 56, which causes the rotating seat 53 to rotate. When the lead screw 56 is limited and cannot rotate, the lead screw 56 will move up or down along the rotating seat 53 in a straight line.

[0031] A sealing block 512 is fixedly connected to the bottom end of the lead screw 56. A sliding rod 511 is fixedly installed at the bottom end of the sealing block 512. A piston 57 is slidably installed on the surface of the sliding rod 511. The low-pressure pipe 52 is slidably connected to the piston 57. The height inside the low-pressure pipe 52 can be adjusted by adjusting the position of the piston 57, thereby adjusting the height of the liquid level and thus adjusting the pressure of the low-pressure test.

[0032] Multiple friction rings 58 are fixedly installed on the surface of piston 57. The surface of friction ring 58 contacts the inner wall of low-pressure pipe 52 to enhance the rotational friction between piston 57 and the inner wall of low-pressure pipe 52, and to prevent piston 57 from rotating under force, which would affect the operation of lead screw 56.

[0033] Since the sliding rod 511 is slidably connected to the piston 57, the piston 57 will not rotate under the action of the friction ring 58. Therefore, the sealing block 512 can limit the lead screw 56, so that the lead screw 56 will not rotate. Thus, when the rotating seat 53 rotates, it can drive the lead screw 56 to move linearly upward or downward.

[0034] A sealing block 512 is also fixedly installed at the lower end of the sliding rod 511. Sealing grooves 59 are provided at both the upper and lower ends of the piston 57. The sealing block 512 and the sealing groove 59 are matched. The length of the sliding rod 511 is higher than the height of the piston 57. Multiple through grooves 510 are provided through the piston 57. The sealing grooves 59 and the through grooves 510 are connected.

[0035] The length of the sliding rod 511 is longer than the height of the piston 57, so that the sliding rod 511 can move up and down along the piston 57. During the upward or downward movement, the sealing blocks 512 at the upper and lower ends can disengage from the sealing groove 59 for a period of time, thereby releasing the sealing effect of the piston 57 and connecting the upper and lower ends of the piston 57 in the low-pressure pipe 52, so that the low-pressure pipe 52 is in a state of communication with the outside.

[0036] A low-pressure valve pressure testing device, the working principle of which is as follows:

[0037] The valve to be tested is installed between the clamping seats 3 inside the pressure testing machine 1, and the pressure testing machine 1 is connected to the connecting pipe 51 through the valve. When performing low-pressure testing, the motor is started, and the motor drives the drive gear 54 to rotate. When the drive gear 54 rotates, it drives the rotating seat 53 to rotate through meshing. The rotation of the rotating seat 53 drives the lead screw 56 to move upward. When the lead screw 56 moves upward, it drives the sealing block 512 and the sliding rod 511 to move upward, so that the sealing block 512 at the lower end of the sliding rod 511 is engaged in the sealing groove 59, so that the piston 57 is in a sealed state. The lead screw 56 continues to move, driving the piston 57 to move upward along the low-pressure pipe 52. The height of the piston 57 is controlled according to the low-pressure requirement.

[0038] Once the height of piston 57 is determined, the motor reverses, causing lead screw 56 to move downwards, which in turn causes sliding rod 511 to move, so that both sealing blocks 512 disengage from sealing groove 59, making low-pressure pipe 52 connected to the outside.

[0039] During water pressure testing, the three-way valve 7 is connected to the storage tank 4. The pump inside the pressure testing machine 1 operates, drawing water from the storage tank 4 through the three-way valve 7 and the check valve 6 into the valve body under test and the low-pressure pipe 52 until the tank is full, at which point the pump stops. At this point, the pressure inside the valve body under test is the pressure caused by the liquid level difference between the low-pressure pipe 52 and the valve body. The overall low pressure is controllable and more closely resembles the actual working state of the valve. Furthermore, the motor continues to operate, sealing the piston 57 and further pressurizing the valve, ensuring a sealed state inside the valve and the low-pressure pipe 52, thus further mimicking the actual working conditions.

[0040] During air pressure testing, the three-way valve 7 is connected to the outside. By reversing the motor, the lead screw 56 moves continuously downward, which can quickly pressurize the gas and thus test the sealing effect of the valve under low-pressure gas conditions.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-pressure valve testing device, characterized in that: It includes a pressure testing machine (1) and a liquid storage tank (4). A three-way valve (7) is fixedly installed on the liquid storage tank (4) through a pipeline. A one-way valve (6) is fixedly connected to the three-way valve (7) through a pipeline. A low-pressure regulating mechanism (5) is provided between the one-way valve (6) and the pressure testing machine (1) for regulating the pressure during low-pressure testing.

2. The low-pressure valve testing device according to claim 1, characterized in that: The low-pressure regulating mechanism (5) includes a connecting pipe (51), one end of which is connected to the pressure testing machine (1) through a valve, and the other end of which is fixedly connected to a low-pressure pipe (52). The bottom end of the low-pressure pipe (52) is fixedly connected to the outlet of a one-way valve (6).

3. The low-pressure valve testing device according to claim 2, characterized in that: A piston (57) is slidably installed inside the low-pressure pipe (52). A sealing groove (59) is provided at both the upper and lower ends of the piston (57). Multiple through grooves (510) are provided through the piston (57). The sealing groove (59) and the through grooves (510) are connected.

4. A low-pressure valve testing device according to claim 3, characterized in that: A sliding rod (511) is slidably installed through the center of the piston (57). A sealing block (512) is fixedly installed at both the upper and lower ends of the sliding rod (511). The sealing block (512) is adapted to the sealing groove (59). The length of the sliding rod (511) is higher than the height of the piston (57).

5. A low-pressure valve testing device according to claim 4, characterized in that: Multiple friction rings (58) are fixedly installed on the surface of the piston (57), and the surface of the friction rings (58) is in contact with the inner wall of the low-pressure pipe (52).

6. A low-pressure valve testing device according to claim 2, characterized in that: A rotating seat (53) is rotatably mounted on the top end of the low-pressure pipe (52). A drive gear (54) is meshed on the rotating seat (53). A motor is fixedly connected to the drive gear (54). A lead screw (56) is threaded through the rotating seat (53).

7. A low-pressure valve testing device according to claim 6, characterized in that: Multiple ventilation holes (55) are provided through the rotating seat (53), and the lead screw (56) is fixedly connected to the sealing block (512).

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