Valve test protection device

Abstract

The invention discloses a valve test protection device, belongs to the technical field of valve tests, and aims to solve the problem that an overpressure explosion risk exists in a water pressure strength test of an existing valve. A valve test protection device comprises a connecting piece, a shell, a valve head and a pressing rod, the shell is a hollow component with a lower opening, the upper portion of the connecting piece is in threaded fit with the lower opening of the shell, a medium inlet hole and a medium discharging hole are formed in the connecting piece, the valve head is located in the shell and opens or seals a medium inlet, and a sinking groove is formed in the upper end face of the valve head. The lower end of the pressing rod abuts against the groove bottom of the sinking groove, the upper end of the pressing rod penetrates through the top wall of the shell, the pressing rod is sleeved with a disc spring assembly, the upper end of the disc spring assembly abuts against the top wall of the shell, and the lower end of the disc spring assembly abuts against a shaft shoulder structure at the bottom of the pressing rod. When the pressure of the water pressure test equipment is increased to the relief pressure, the pressure of the medium water is relieved through the device, and the valve shell explosion caused by overpressure in the valve water pressure strength test is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of valve testing, and in particular relates to a valve testing protection device. Background Art

[0002] Valves are needed in the energy field, petrochemical industry and other fields. As a key component on the pipeline, valves are widely used in various fields. As a general equipment, valves must undergo a series of factory tests in accordance with national standards and industry standards before leaving the factory. Among them, the valve water pressure strength test is a common and necessary test for most valves before leaving the factory. The valve water pressure strength test is a test based on the nominal pressure of the valve. It is a test to verify the strength of the valve shell and a necessary test for the safety of the valve as a special equipment.

[0003] At present, the water pressure strength test of all valves is carried out in accordance with the pressure level regulations of the valves, and this test is generally carried out by the valve manufacturer. The valve manufacturer uses water pressure test equipment to increase the pressure of the valve shell to test the safety performance of the valve shell. In the process of increasing the pressure through the water pressure test equipment, it is a manual operation and is prone to overpressure risks. Because the valve water pressure strength test itself is a safety test of the valve shell, if overpressure occurs again during the operation, the risk of explosion of the valve shell will increase sharply, forming a short-term safety hazard; if an explosion occurs, it will cause life-threatening damage to the water pressure test personnel and product inspectors, and in reality, there are personnel injuries during the valve water pressure test every year. Therefore, there is a need for a device that can be easily set up during the valve water pressure test to prevent water pressure overpressure during the water pressure test. Summary of the invention

[0004] The purpose of the present invention is to provide a valve test protection device to solve the problem of overpressure explosion risk in the hydraulic strength test of existing valves. The technical solution adopted by the present invention is as follows:

[0005] A valve test protection device comprises a connecting piece, a shell, a valve head and a pressure rod. The shell is a hollow component with a lower opening. The lower end of the connecting piece is connected to the valve test pipeline. The upper part of the connecting piece is threadedly matched with the lower opening of the shell. The connecting piece is provided with a medium inlet hole and a medium discharge hole. The interior and the exterior of the shell are connected through the medium discharge hole. The valve head is located in the shell. A first sealing ring structure is provided on the lower end surface of the valve head. A second sealing ring structure is provided on the upper end surface of the connecting piece. The second sealing ring structure is coaxial with the medium inlet hole. The first sealing ring structure and the second sealing ring structure are abutted for sealing or separation. A sink groove is provided on the upper end surface of the valve head. The lower end of the pressure rod abuts against the bottom of the sink groove. The upper end of the pressure rod passes through the top wall of the shell. A disc spring assembly is sleeved on the pressure rod. The upper end of the disc spring assembly abuts against the top wall of the shell, and the lower end of the disc spring assembly abuts against the shoulder structure at the bottom of the pressure rod.

[0006] Furthermore, an elastic retaining ring groove is processed on the upper end of the pressure rod.

[0007] Furthermore, the lower end surface of the pressure rod is a spherical surface, and the lower end surface of the pressure rod is universally tangentially matched with the bottom of the sink.

[0008] Furthermore, it also includes a spring seat, the outer diameter of the spring seat is larger than the outer diameter of the shoulder structure, the spring seat is sleeved on the pressure rod, the lower end surface of the spring seat is against the upper end surface of the shoulder structure, and the lower end of the disc spring assembly is against the upper end surface of the spring seat.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The pressure relief pressure is set to be equal to the water pressure of the tested valve, or the pressure relief pressure is slightly greater than the water pressure of the tested valve. The pre-compression elastic force of the disc spring assembly can be adjusted by rotating the connector and the housing. The relief pressure of the device of the present invention is first set, and then the lower end of the connector is welded between the tested valve and the water pressure test equipment, and then the pressure is increased by the water pressure test equipment to perform the valve water pressure strength test. When the water pressure test equipment increases the pressure to the relief pressure, the medium water lifts the valve head, the medium water enters the housing through the medium inlet hole, and flows out of the housing through the medium discharge hole, thereby avoiding the explosion of the valve housing caused by overpressure during the valve water pressure strength test. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention;

[0012] Figure 2 is a cross-sectional view of the connector;

[0013] Figure 3 is a cross-sectional view of the valve head;

[0014] Figure 4 It is a structural diagram of the compression rod;

[0015] Figure 5 is a cross-sectional view of the housing;

[0016] Figure 6 It is a cross-sectional view of the disc spring seat.

[0017] In the figure, 1. connecting piece, 2. valve head, 3. spring seat, 4. disc spring assembly, 5. housing, 6. pressure rod, 7. medium inlet hole, 8. medium discharge hole, 9. sink, 10. first sealing ring structure, 11. shaft shoulder structure, 12. elastic retaining ring groove, 13. second sealing ring structure. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0019] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0021] Example: Figure 1 to Figure 6 As shown, a valve test protection device comprises a connector 1, a housing 5, a valve head 2 and a pressure rod 6. The housing 5 is a hollow member with a lower opening. The lower end of the connector 1 is connected to the valve test pipeline. The upper part of the connector 1 is threadedly matched with the lower opening of the housing 5. The connector 1 is provided with a medium inlet hole 7 and a medium discharge hole 8. The interior of the housing 5 is connected to the outside through the medium discharge hole 8. The valve head 2 is located in the housing 5. The lower end surface of the valve head 2 is provided with a first sealing ring structure 10. The upper end surface of the connector 1 is provided with a first sealing ring structure 10. A second sealing ring structure 13 is provided on the end face, and the second sealing ring structure 13 is coaxial with the medium inlet hole 7. The first sealing ring structure 10 and the second sealing ring structure 13 are abutted to seal or separate. A recessed groove 9 is provided on the upper end face of the valve head 2. The lower end of the pressure rod 6 abuts against the bottom of the recessed groove 9. The upper end of the pressure rod 6 passes through the top wall of the outer shell 5. A disc spring assembly 4 is sleeved on the pressure rod 6. The upper end of the disc spring assembly 4 abuts against the top wall of the outer shell 5, and the lower end of the disc spring assembly 4 abuts against the shoulder structure 11 at the bottom of the pressure rod 6.

[0022] An elastic retaining ring groove 12 is processed on the upper end of the pressure rod 6 , and an elastic retaining ring is arranged on the elastic retaining ring groove 12 to prevent the pressure rod 6 from sliding down and completely entering the housing 5 .

[0023] The lower end surface of the pressing rod 6 is a spherical surface, and the lower end surface of the pressing rod 6 is tangentially matched with the bottom of the sink groove 9 to facilitate pressing and aligning.

[0024] It also includes a spring seat 3, the outer diameter of which is larger than the outer diameter of the shoulder structure 11, the spring seat 3 is sleeved on the pressure rod 6, the lower end surface of the spring seat 3 is abutted against the upper end surface of the shoulder structure 11, and the lower end of the disc spring assembly 4 is abutted against the upper end surface of the spring seat 3. The function of the spring seat 3 is to limit the disc spring assembly 4 and stabilize it.

[0025] The pre-compression elastic force of the disc spring assembly 4 is the relief pressure of the device of the present invention. According to the safety pressure setting of the test, the pressure relief pressure is set to be equal to the water pressure of the tested valve, or the pressure relief pressure is slightly greater than the water pressure of the tested valve. The pre-compression elastic force of the disc spring assembly 4 can be adjusted by rotating the connector 1 and the housing 5. The relief pressure of the device of the present invention is first set, and then the lower end of the connector 1 is welded between the tested valve and the water pressure test equipment, and then the pressure is increased by the water pressure test equipment to perform the valve water pressure strength test. When the water pressure test equipment increases the pressure to the relief pressure, the medium water lifts the valve head 2, the medium water enters the housing 5 from the medium inlet hole 7, and flows out of the housing 5 from the medium discharge hole 8, so as to avoid the explosion of the valve housing caused by overpressure during the valve water pressure strength test.

[0026] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A valve test protection device, characterized in that: The invention comprises a connecting piece (1), a shell (5), a valve head (2) and a pressure rod (6); the shell (5) is a hollow component with a lower opening; the lower end of the connecting piece (1) is connected to a valve test pipeline; the upper part of the connecting piece (1) is threadedly matched with the lower opening of the shell (5); the connecting piece (1) is provided with a medium inlet hole (7) and a medium discharge hole (8); the inside and the outside of the shell (5) are connected through the medium discharge hole (8); the valve head (2) is located in the shell (5); the lower end surface of the valve head (2) is provided with a first sealing ring structure (10); the upper end surface of the connecting piece (1) is provided with a second sealing ring structure (11); The sealing ring structure (13) and the second sealing ring structure (13) are coaxial with the medium inlet hole (7). The first sealing ring structure (10) and the second sealing ring structure (13) are abutted to seal or separate. A recessed groove (9) is provided on the upper end surface of the valve head (2). The lower end of the pressure rod (6) is abutted against the bottom of the recessed groove (9). The upper end of the pressure rod (6) passes through the top wall of the shell (5). A disc spring assembly (4) is sleeved on the pressure rod (6). The upper end of the disc spring assembly (4) is abutted against the top wall of the shell (5). The lower end of the disc spring assembly (4) is abutted against the shaft shoulder structure (11) at the bottom of the pressure rod (6).

2. A valve test protection device according to claim 1, characterized in that: The upper end of the pressure rod (6) is processed with an elastic retaining ring groove (12).

3. A valve test protection device according to claim 1, characterized in that: The lower end surface of the pressing rod (6) is a spherical surface, and the lower end surface of the pressing rod (6) is universally tangentially matched with the bottom of the sink groove (9).

4. A valve test protection device according to any one of claims 1 to 3, characterized in that: It also includes a spring seat (3), the outer diameter of the spring seat (3) is larger than the outer diameter of the shaft shoulder structure (11), the spring seat (3) is sleeved on the pressure rod (6), the lower end surface of the spring seat (3) is against the upper end surface of the shaft shoulder structure (11), and the lower end of the disc spring assembly (4) is against the upper end surface of the spring seat (3).

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