A PV valve testing device

Abstract

This utility model discloses a PV valve testing device, including a compressed air tank, a PV valve test chamber, and a test valve assembly connected by hoses. The PV valve test chamber is connected to a PV valve via hoses. The test valve assembly includes a first valve, a second valve, a third valve, and a vacuum generator. The first valve is located on a hose between the compressed air tank and the PV valve test chamber. The second and third valves are respectively located on two side hoses of the first valve. One end of each side hose is connected to the hose of the first valve, and the other end of each side hose is connected to the vacuum generator. The vacuum generator is connected to an exhaust hose. A pressure gauge and a vacuum gauge are connected to the PV valve test chamber. This utility model's PV valve testing device, by switching the open and closed states of each valve in the test valve assembly, can quickly test and record the start-up pressure of the PV valve, and detect its gas-driving performance and vacuum performance. It has a simple structure, is easy to install, and is simple to operate.

Description

Technical Field

[0001] This utility model belongs to the field of valve testing technology, and specifically relates to a PV valve testing device. Background Technology

[0002] To ensure safe loading and unloading operations and normal navigation on chemical tankers, and to prevent damage and explosions to the cargo oil tank structure, each cargo tank is equipped with a venting system to limit the pressure and vacuum level within the tanks. The PV valve in this system is a crucial piece of equipment, used to regulate the pressure and vacuum level within the cargo oil tanks, ensuring the safety of the vessel during loading, unloading, and navigation. PV valves that have undergone prolonged use or malfunction require disassembly for maintenance or repair. Before installation on board, the PV valve's pneumatic and vacuum performance must be tested to ensure proper repair and prevent unusable installation. Therefore, a simulation device needs to be designed onboard for this testing. Utility Model Content

[0003] To address the aforementioned issues, this utility model provides a PV valve testing device. It connects a test valve assembly, a PV valve test box, and the PV valve itself via a hose using compressed air from a gas source. By switching the open and closed states of each valve in the test valve assembly, it can quickly test and record the starting pressure of the PV valve, thereby detecting its gas-driving and vacuum performance. The device features a simple structure, convenient installation, and easy operation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A PV valve testing device includes a compressed air tank and a PV valve test chamber connected by hoses, as well as a test valve assembly. The PV valve test chamber is connected to the PV valve via hoses. The test valve assembly includes a first valve, a second valve, a third valve, and a vacuum generator. The first valve is disposed on a hose located between the compressed air tank and the PV valve test chamber. The second and third valves are respectively disposed on two side hoses located on the two sides of the first valve. One end of each side hose is connected to the hose of the first valve, and the other end of each side hose is connected to the vacuum generator. The vacuum generator is connected to an exhaust hose. A pressure gauge and a vacuum gauge are connected to the PV valve test chamber.

[0006] Furthermore, the PV valve testing device also includes a pressure sensor and a data logger. The pressure sensor is located on a flexible hose between the PV valve testing box and the PV valve, and the data logger is located on the PV valve testing box. The pressure sensor and the data logger are connected via a signal line.

[0007] Furthermore, the pressure sensor is located on the side of the hose closest to the PV valve.

[0008] Furthermore, a vent valve is connected to the PV valve test box via a hose.

[0009] Furthermore, all the hoses are sealed to the PV valve test chamber.

[0010] The PV valve testing device provided by this utility model connects the gas source, the test valve group, the PV valve test box and the PV valve together through a hose. It can quickly and conveniently test the gas driving performance and vacuum performance of the PV valve, and help ship maintenance personnel to complete PV valve testing and maintenance work efficiently and accurately, so as to ensure that the PV valve is properly maintained, avoid it being unusable after installation on the ship, reduce the difficulty of on-site construction, and ensure the safe operation and use of the system. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the PV valve testing device described in this utility model.

[0012] Among them, 1-compressed air tank, 2-test valve assembly, 3-PV valve test box, 4-pressure gauge, 5-vacuum gauge, 6-data logger.

[0013] 7-Pressure sensor, 8-PV valve, 9-Relief valve. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 As shown, a PV valve testing device includes a compressed air tank 1, a PV valve testing chamber 3, and a testing valve assembly 2 connected by hoses. The PV valve testing chamber 3 is connected to the PV valve 8 via hoses. The testing valve assembly 2 includes a first valve 21, a second valve 22, a third valve 23, and a vacuum generator 24. The first valve 21 is located on a hose between the compressed air tank 1 and the PV valve testing chamber 3. The second valve 22 and the third valve 23 are respectively located on two side hoses of the first valve 21. One end of each side hose is connected to the hose of the first valve 21, and the other end of each side hose is connected to the vacuum generator 24. The vacuum generator 24 is connected to an exhaust hose. A pressure gauge 4 and a vacuum gauge 5 are connected to the PV valve testing chamber 3. All hoses are sealed to the PV valve testing chamber 3.

[0016] Furthermore, the PV valve testing device also includes a pressure sensor 7 and a data logger 6. The pressure sensor 7 is mounted on a flexible hose located between the PV valve testing chamber 3 and the PV valve 8, and the data logger 6 is mounted on the PV valve testing chamber 3. The pressure sensor 7 and the data logger 6 are connected via a signal line. To ensure more accurate test data, the pressure sensor 7 is positioned on the side of the flexible hose closest to the PV valve 8.

[0017] Furthermore, a relief valve 9 is connected to the PV valve test box 3 via a hose.

[0018] As the injection pressure of compressed air tank 1 gradually increases, the first valve 21 in test valve assembly 2 opens, while the second valve 22 and the third valve 23 close, simulating the positive pressure environment inside the cargo oil tank. The pressure gauge 4 on the PV valve test box 3 changes its index. When a certain pressure is reached, the PV valve 8 opens to discharge excess evaporated gas from the tank, causing the tank pressure to drop. As the injection pressure of compressed air tank 1 gradually increases, the second valve 22 and the third valve 23 in test valve assembly 2 open, while the first valve 21 closes. Compressed air is discharged through the second valve 22 and the vacuum generator 24, while a negative pressure is created at the third valve 23, initiating a vacuum process. The vacuum gauge 5 on the PV valve test chamber 3 changes its index. When the pressure is too low, the PV valve 8 draws in air, causing the chamber pressure to rise. Pressure gauge 4 is used for positive pressure testing, and vacuum gauge 5 is used for negative pressure testing. Pressure sensor 7 transmits the signal to data logger 6, recording the positive pressure release and negative pressure intake of PV valve 8 at the set pressure, verifying whether it meets the design values. In the closed state, pressure sensor 7 detects system pressure changes and calculates the pressure decay value per unit time to determine whether the sealing performance meets the standard. Safety protection integrates a relief valve 9 and a fireproof and explosion-proof structure to prevent danger caused by overpressure or sparks during the test.

[0019] Those skilled in the art should understand that the above description is merely a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PV valve testing device, characterized in that, The system includes a compressed air tank and a PV valve test chamber connected by hoses, as well as a test valve assembly. The PV valve test chamber is connected to the PV valve via hoses. The test valve assembly includes a first valve, a second valve, a third valve, and a vacuum generator. The first valve is located on a hose between the compressed air tank and the PV valve test chamber. The second and third valves are respectively located on two side hoses on either side of the first valve. One end of each side hose is connected to the hose of the first valve, and the other end of each side hose is connected to the vacuum generator. The vacuum generator is connected to an exhaust hose. A pressure gauge and a vacuum gauge are connected to the PV valve test chamber.

2. The PV valve testing device according to claim 1, characterized in that, The PV valve testing device also includes a pressure sensor and a data logger. The pressure sensor is located on a flexible hose between the PV valve testing box and the PV valve, and the data logger is located on the PV valve testing box. The pressure sensor and the data logger are connected via a signal line.

3. The PV valve testing device according to claim 2, characterized in that, The pressure sensor is located on the side of the hose closest to the PV valve.

4. The PV valve testing device according to claim 1, characterized in that, A vent valve is connected to the PV valve test box via a hose.

5. The PV valve testing device according to claim 4, characterized in that, All hoses are sealed to the PV valve test chamber.

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