Double-sealing rotary ball valve

Abstract

The utility model discloses a double-sealing rotary ball valve which is provided with a valve body, a maintenance sealing valve plate is arranged at the water inlet end in the valve body, a working sealing valve plate is arranged at the water outlet end in the valve body, a valve plate maintenance sealing ring is arranged on the outer circumference of the maintenance sealing valve plate, and a valve body maintenance sealing ring matched with the maintenance sealing ring is correspondingly arranged on the inner circumference of the valve body. A valve plate working sealing ring is arranged on the outer circumference of the working sealing valve plate, a valve body working sealing ring, a valve plate overhauling sealing ring and a valve body overhauling sealing ring which are matched with each other are correspondingly arranged on the inner circumference of the valve body, the valve plate working sealing ring and the valve body working sealing ring are metal sealing rings, and the valve plate overhauling sealing ring is fixed on the outer circumference of the overhauling sealing valve plate. The valve plate working sealing ring is fixed on the outer circumference of the working sealing valve plate; the valve body maintenance sealing ring and the valve body working sealing ring can slide in a reciprocating mode in the axis direction of the valve body. The sealing device can be used in a high-water-pressure environment, and the sealing pair is precise in sealing fit.

Description

Technical Field

[0001] The utility model relates to a double-sealed rotary ball valve. Background Art

[0002] The double-seal rotary ball valve in the prior art comprises a valve body, a maintenance sealing valve plate at the water inlet end of the valve body and a working sealing valve plate at the water outlet end. The maintenance sealing valve plate and the working sealing valve plate are installed in the valve body through a valve shaft. A valve plate maintenance sealing ring is installed on the outer circumference of the maintenance sealing valve plate, and a corresponding valve body maintenance sealing ring is installed on the inner circumference of the valve body. A valve plate working sealing ring is installed on the outer circumference of the working sealing valve plate, and a corresponding valve body working sealing ring is installed on the inner circumference of the valve body.

[0003] The existing double-seal ball valves use only a rubber-to-metal elastic soft seal for the working seal, with the seal pair consisting of rubber pressed against a stainless steel surface. Using a hard seal for the working seal prevents precise positioning of the valve disc's closed position, resulting in a certain degree of error. This can prevent the upstream valve body inspection seal from properly fitting with the valve disc seal, leading to water leakage and making it impossible to inspect and maintain the working seal. Rubber seals, due to aging and wear, require regular replacement, increasing maintenance costs. Furthermore, rubber seals cannot achieve a seal under high water heads. Utility Model Content

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and to propose a double-seal rotary ball valve that can better adapt to use in higher water pressure environments. In the present invention, the sealing pair between the valve body and the valve plate is precisely matched and has a long service life.

[0005] In order to solve the above technical problems, the utility model provides a double-sealed rotary ball valve, which has a valve body, a water inlet end of the valve body having a maintenance sealing valve plate, and a water outlet end having a working sealing valve plate, the maintenance sealing valve plate and the working sealing valve plate are installed in the valve body through the valve shaft, and a valve plate maintenance sealing ring is installed on the outer circumference of the maintenance sealing valve plate, and a matching valve body maintenance sealing ring is correspondingly installed on the inner circumference of the valve body, and a valve plate working sealing ring is installed on the outer circumference of the working sealing valve plate, and a matching valve body working sealing ring is correspondingly installed on the inner circumference of the valve body. It is characterized in that: the valve plate maintenance sealing ring, valve body maintenance sealing ring, valve plate working sealing ring and valve body working sealing ring are all metal sealing rings, the valve plate maintenance sealing ring is fixed on the outer circumference of the maintenance sealing valve plate, and the valve plate working sealing ring is fixed on the outer circumference of the working sealing valve plate; the valve body maintenance sealing ring and the valve body working sealing ring can both slide back and forth along the axis direction of the valve body.

[0006] As an improvement of the present invention, it also includes an inspection piston and a working piston that can slide back and forth along the axis of the valve body, the valve body inspection sealing ring is fixed on the inner circumference of the inspection piston, and the valve body working sealing ring is fixed on the inner circumference of the working piston; a circumferential inspection boss is formed on the outer wall of the inspection piston, and the water inlet end of the valve body is fixed with a water inlet piston pressure cover that can prevent the inspection piston from sliding out to the water inlet side, and an inspection limiting boss is formed on the inner circumference of the water inlet end of the valve body to prevent the inspection piston from sliding out to the water outlet side, and pressure inspection chambers are respectively formed between the inspection piston and the water inlet piston pressure cover, the inspection limiting boss and the inner wall of the valve body at the water inlet end, which are located on both sides of the inspection boss. The valve body wall at the water inlet end is respectively provided with pressure water inlet and outlet inspection channels that are connected to the pressure inspection chambers on both sides of the inspection boss; a circumferential working boss is formed on the outer wall of the working piston, and the water outlet end of the valve body is fixed with a water outlet piston pressure cover that can prevent the working piston from sliding toward the water outlet side, and a working limit boss that can prevent the working piston from sliding toward the water inlet side is formed on the inner circumference of the water outlet end of the valve body. Pressure working chambers on both sides of the working boss are respectively formed between the working piston and the water outlet piston pressure cover, the working limit boss and the inner wall of the valve body at the water outlet end, and pressure water inlet and outlet working channels that are connected to the pressure working chambers on both sides of the working boss are respectively provided on the valve body wall at the water outlet end.

[0007] Furthermore, an inspection rubber sealing ring is provided between the inspection piston and the inner wall of the water inlet end of the valve body, between the inspection piston and the water inlet piston pressure cover, and between the water inlet piston pressure cover and the inner wall of the water inlet end of the valve body; a working rubber sealing ring is provided between the working piston and the inner wall of the water outlet end of the valve body, between the working piston and the water outlet piston pressure cover, and between the water outlet piston pressure cover and the inner wall of the water outlet end of the valve body.

[0008] The utility model has the following beneficial technical effects: 1. The valve plate inspection seal ring, valve body inspection seal ring, valve plate working seal ring and valve body working seal ring are all metal seal rings, which can adapt to the working environment with higher water pressure and have a longer service life; 2. The valve body inspection seal ring and the valve body working seal ring can both slide back and forth along the valve body axis direction, so that the sealing pair between the valve body and the valve plate in the utility model is more precise; 3. An inspection piston and a working piston are provided in the utility model, and the valve body inspection seal ring is fixed on the inner circumference of the inspection piston, and the valve body working seal ring is fixed on the inner circumference of the working piston. The reciprocating sliding of the inspection piston and the working piston along the valve body axis can drive the valve body inspection seal ring and the valve body working seal ring to slide back and forth along the valve body axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be described in further detail below with reference to the accompanying drawings.

[0010] Figure 1 The utility model is a schematic cross-sectional view of a double-seal rotary ball valve.

[0011] Figure 2 yes Figure 1 A magnified schematic diagram of the local structure.

[0012] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at position I in the figure.

[0013] Figure 4 yes Figure 2 A magnified schematic diagram of the structure at position II in the figure. DETAILED DESCRIPTION

[0014] See also Figure 1 - Figure 4The utility model is a double-sealed rotary ball valve with a valve body 10. The water inlet end of the valve body is provided with a maintenance sealing valve plate 20 and the water outlet end is provided with a working sealing valve plate 30. The maintenance sealing valve plate and the working sealing valve plate are installed in the valve body through the valve shaft 9. The outer circumference of the maintenance sealing valve plate is provided with a valve plate maintenance sealing ring 21, and the inner circumference of the valve body is provided with a matching valve body maintenance sealing ring 11. The outer circumference of the working sealing valve plate is provided with a valve plate working sealing ring 31, and the inner circumference of the valve body is provided with a matching valve body maintenance sealing ring 11. It is equipped with a matching valve body working sealing ring 12. The valve plate inspection sealing ring 21, the valve body inspection sealing ring 11, the valve plate working sealing ring 31 and the valve body working sealing ring 12 are all metal sealing rings. The valve plate inspection sealing ring 21 is fixed on the outer circumference of the inspection sealing valve plate 20, and the valve plate working sealing ring 31 is fixed on the outer circumference of the working sealing valve plate 30; the valve body inspection sealing ring 11 and the valve body working sealing ring 12 can both slide back and forth along the valve body axis direction. The valve body also includes an inspection piston 22 and a working piston 32 that can slide back and forth along the axis of the valve body. The valve body inspection seal ring 11 is fixed on the inner circumference of the inspection piston, and the valve body working seal ring 12 is fixed on the inner circumference of the working piston. A circumferential inspection boss 23 is formed on the outer wall of the inspection piston 22. The water inlet end of the valve body is fixed with a water inlet piston pressure cover 24 that can prevent the inspection piston from sliding out to the water inlet side, and a maintenance limiting boss 13 that can prevent the inspection piston from sliding out to the water outlet side is formed on the inner circumference of the water inlet end of the valve body. Pressure inspection chambers 25 located on both sides of the inspection boss are respectively formed between the inspection piston and the water inlet piston pressure cover, the inspection limiting boss and the inner wall of the valve body at the water inlet end, and the water inlet The valve body walls at the two ends are respectively provided with pressure water inlet and outlet inspection channels 15 that are connected to the pressure inspection chambers on both sides of the inspection boss; a circumferential working boss 33 is formed on the outer wall of the working piston 32, and the water outlet end of the valve body is fixed with a water outlet piston pressure cover 34 that can prevent the working piston from sliding out to the water outlet side, and a working limit boss 14 that can prevent the working piston from sliding out to the water inlet side is formed on the inner circumference of the water outlet end of the valve body, and pressure working chambers 35 located on both sides of the working boss are respectively formed between the working piston and the water outlet piston pressure cover, the working limit boss and the inner wall of the valve body at the water outlet end, and correspondingly, the valve body walls at the water outlet end are respectively provided with pressure water inlet and outlet working channels 16 that are connected to the pressure working chambers on both sides of the working boss. An inspection rubber sealing ring 26 is provided between the inspection piston and the inner wall of the water inlet end of the valve body, between the inspection piston and the water inlet piston pressure cover, and between the water inlet piston pressure cover and the inner wall of the water inlet end of the valve body. A working rubber sealing ring 36 is provided between the working piston and the inner wall of the water outlet end of the valve body, between the working piston and the water outlet piston pressure cover, and between the water outlet piston pressure cover and the inner wall of the water outlet end of the valve body.

[0015] The double-seal rotary ball valve of the present invention requires both the pressure water inlet and outlet inspection channel and the pressure water inlet and outlet working channel to be connected to a pressure water source when in use. During operation, the pressure water first enters the corresponding pressure inspection chamber from the pressure water inlet and outlet inspection channel on one side, pushing the inspection piston 22 to slide toward the water inlet end, disengaging the valve body inspection seal ring 11 from the valve plate inspection seal ring 21. Afterwards, the pressure water enters the corresponding pressure working chamber from the pressure water inlet and outlet working channel on one side, pushing the working piston 32 to slide toward the water outlet end, disengaging the valve body working seal ring 12 from the valve plate working seal ring 31. Then, the inspection seal valve plate 20 and the working seal valve plate 30 are rotated to the fully open position through the valve shaft, and the opening action of the present invention is completed. Conversely, the closing action of the present invention can be completed.

[0016] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Any modification or equivalent replacement of the present invention to achieve the same technical effect is within the scope of protection of the present invention.

Claims

1. A double-seal rotary ball valve having a valve body, a maintenance sealing valve plate at the water inlet end of the valve body, and a working sealing valve plate at the water outlet end. The maintenance sealing valve plate and the working sealing valve plate are mounted in the valve body through the valve shaft. A valve plate maintenance sealing ring is mounted on the outer circumference of the maintenance sealing valve plate, and a matching valve body maintenance sealing ring is mounted on the inner circumference of the valve body. A valve plate working sealing ring is mounted on the outer circumference of the working sealing valve plate, and a matching valve body working sealing ring is mounted on the inner circumference of the valve body. It is characterized in that: The valve plate inspection sealing ring, valve body inspection sealing ring, valve plate working sealing ring and valve body working sealing ring are all metal sealing rings. The valve plate inspection sealing ring is fixed on the outer circumference of the inspection sealing valve plate, and the valve plate working sealing ring is fixed on the outer circumference of the working sealing valve plate; the valve body inspection sealing ring and the valve body working sealing ring can both slide back and forth along the axis direction of the valve body.

2. The double-seal rotary ball valve according to claim 1, characterized in that: The cam is secured to the cam face and is secured to the cam face with an angular channel formed between the cam face and the valve body, and the cam face is secured to the cam face with an angular channel formed between the cam face and the valve body. The valve body wall is respectively provided with pressure water inlet and outlet inspection channels that are connected to the pressure inspection chambers on both sides of the inspection boss; a circumferential working boss is formed on the outer wall of the working piston, and the water outlet end of the valve body is fixed with a water outlet piston pressure cover that can prevent the working piston from sliding toward the water outlet side, and a working limit boss is formed on the inner circumference of the water outlet end of the valve body to prevent the working piston from sliding toward the water inlet side. Pressure working chambers on both sides of the working boss are respectively formed between the working piston and the water outlet piston pressure cover, the working limit boss and the inner wall of the valve body at the water outlet end, and correspondingly, pressure water inlet and outlet working channels that are connected to the pressure working chambers on both sides of the working boss are respectively provided on the valve body wall at the water outlet end.

3. The double-seal rotary ball valve according to claim 2, characterized in that: An inspection rubber sealing ring is provided between the inspection piston and the inner wall of the water inlet end of the valve body, between the inspection piston and the water inlet piston pressure cover, and between the water inlet piston pressure cover and the inner wall of the water inlet end of the valve body. A working rubber sealing ring is provided between the working piston and the inner wall of the water outlet end of the valve body, between the water outlet piston pressure cover, and between the water outlet piston pressure cover and the inner wall of the water outlet end of the valve body.

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