Blind valve with corrugated tube

Abstract

The product is an innovative non-waved pipe blind valve, which provides a new solution for the technical problem of easy leakage of traditional blind valve. The valve mainly consists of left valve body, right valve body, double-sided air bag type sealing ring assembly, pulse port, through blind plate assembly, diffusion port, blowdown port and the like. Its structure is simple and action is reliable. In the operation process, the driving device drives the transmission shaft to drive the through blind plate assembly to rotate to the predetermined position of "through" or "blind". Then, the air bag type sealing ring system is pressurized, so that the sealing ring closely fits on the sealing surface of the through blind plate assembly, thereby realizing reliable isolation of the pipeline medium and the valve cavity. The valve completely abandons the structure of the corrugated pipe (or the telescopic sleeve), fundamentally eliminates the leakage risk caused by the fatigue and wear of the corrugated pipe, and simplifies the operation process without the valve body moving step. It is especially suitable for occasions such as coal gas pipeline that require high reliability isolation.

Description

Technical Field

[0001] This invention provides a special device for use in the fluid industry and gas field, involving reliable gas isolation, a double-sided sealed bellows-free blind valve, belonging to the field of blind valve technology. Background Technology

[0002] According to GB 6222-2005 "Safety Regulations for Coal Gas in Industrial Enterprises", this invention is a bellows-free blind valve.

[0003] In traditional blind valves, when the valve plate needs to be switched (from the "through" position to the "blind" position, or vice versa), the drive device first moves the movable valve body, which is equipped with a bellows or telescopic sleeve, backward to separate it from the fixed valve body, creating a sufficient gap. After the valve plate moves within this gap to complete the position switch, the movable valve body moves forward again, clamping the valve plate between the two valve bodies to achieve a bidirectional seal.

[0004] However, its structure is relatively complex, and the bellows or expansion sleeve, as moving parts, are subject to certain risks of fatigue or wear. Furthermore, the valve body may deform due to thermal expansion and contraction of the pipeline or corrosion of the valve body, which can restrict the movement of the moving valve body. When switching valve plates, the sealing ring is prone to scraping accidents, resulting in the valve failing to effectively isolate the valve. Summary of the Invention

[0005] The present invention provides a double-sided sealed, bellows-free blind valve to address the requirements of the prior art.

[0006] This invention provides a reliable isolation mechanism and offers a new technical solution to the problem of leakage in traditional blind valves. It is a valve with a double-sided airbag-type isolation mechanism without bellows (or telescopic sleeve). Attached Figure Description

[0007] Figure 1 Yes: A sectional view of the left side of the valve. Figure 2 Yes: Valve front view Figure 3 Yes: Double-sided airbag-type sealing ring (partial enlarged view) Figure 4 Yes: Main view of the blind board assembly Detailed Implementation

[0008] The valve mainly consists of three parts: valve body, blind flange assembly, and double-sided airbag sealing rings.

[0009] like Figure 1As shown, the valve cavity (11) is formed by the right valve body (2) and the left valve body (10). There are sealing ring grooves on the left and right valve bodies, and sealing is achieved by installing sealing rings (14). A blind plate assembly (13) is set in the middle of the valve cavity (11). A drive shaft (6) is provided on the blind plate assembly (13). The drive shaft (6) is installed on the drive shaft seat of the right valve body (2) and the left valve body (10), and sealing is achieved by sealing device (7). The airbag-type sealing ring (3) on the right side is pressed against the airbag-type sealing ring skeleton (4) by the pressure plate (12), and the airbag-type sealing ring (3) is fixed on the right valve body. The airbag-type sealing ring on the left side is also fixed in the same way, forming a double-sided airbag-type sealing ring. A vent (8) is provided at the top of the valve and a drain (1) is provided at the bottom, which can meet the needs of on-site venting and sewage discharge.

[0010] like Figure 2 and Figure 4 As shown, the through-blind plate assembly (13) is a component consisting of a through ring (16) and a blind plate (15). The through-blind plate assembly (13) is moved by the drive shaft (6). When the center of the through ring coincides with the center of the pipe, the valve is in the open position; when the center of the blind plate coincides with the center of the pipe, the valve is in the closed position.

[0011] like Figure 3 As shown, when the valve is in the open or closed position, the pressurized fluid enters the airbag-type sealing rings on both sides through the flow channel (5) on the right valve body (2) and the flow channel (9) on the left valve body (10), causing the airbag-type sealing rings to expand rapidly and stick tightly to the sealing surface of the blind plate valve assembly (13), so that the medium in the pipeline does not continuously exchange with the valve cavity (11), thus achieving effective isolation.

Claims

1. A bellows-free blind plate valve, comprising a valve body consisting of a right valve body and a left valve body, a through-blind plate assembly consisting of a through ring, a blind plate and a drive shaft, and a double-sided airbag-type sealing ring consisting of airbag-type sealing rings on both the left and right sides.

2. The bellows-free blind valve according to claim 1, characterized in that: The blind flange assembly is connected to the valve body via a drive shaft, which can move the blind flange assembly to open and close the valve.

3. The bellows-free blind valve according to claim 2, characterized in that: When the valve is in the open or closed state, pressurized fluid enters the right-side airbag seal ring through the flow channel on the right valve body, causing the airbag seal ring to expand rapidly and adhere tightly to the sealing surface of the blind valve assembly. The same applies to the left-side airbag seal ring, thereby achieving effective isolation.

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