WO2020168617A1

WO2020168617A1 - Ultra-low-temperature butterfly valve

Info

Publication number: WO2020168617A1
Application number: PCT/CN2019/080942
Authority: WO
Inventors: 张清双; 茅岭峰
Original assignee: 江苏神通阀门股份有限公司
Priority date: 2019-02-21
Filing date: 2019-04-02
Publication date: 2020-08-27
Also published as: CN109681646A

Abstract

Provided is an ultra-low-temperature butterfly valve, comprising a valve body (9), a butterfly plate (11), axial position-limiting blocks (2), a valve stem (10), a valve cover (12), and a lower end cover (7); the shaft holes at each of the ends of the valve body (9) are provided with axial position-limiting holes (1) in the direction of a passageway; axial position-limiting platforms (3) are provided at both ends of the shaft hole of the butterfly plate (11); the axial position-limiting blocks (2) are respectively mounted between the axial position-limiting holes (1) at both ends of the valve body and the axial position-limiting platforms (3) at both ends of the butterfly plate (11); the tail end of the valve stem (10) is a free end, and the head of the valve stem (10) is provided with an anti-flyout step (5); the inside of the valve cover (12) is provided with an anti-flyout step (5), and an electrostatic conductive spring (8) is disposed between the lower end cover (7) and the valve stem (10). The described butterfly valve can eliminate the phenomenon of the butterfly valve becoming stuck or even failing to open and close due to cold contraction, and also eliminate the safety risk of static electricity.

Description

Ultra-low temperature butterfly valve

Technical field

The invention and an ultra-low temperature butterfly valve.

Background technique

The ultra-low temperature butterfly valve in the prior art usually uses a split ring or a limiting block at the end of the valve stem to axially limit the valve stem. This structure is under ultra-low temperature, because the valve stem shrinks axially to the end of the stem, and the ultra-low temperature butterfly valve requires the valve stem to be in the vertical direction when the valve is installed. The valve stem and the butterfly plate are connected by a pin. Under the action, the rotation center of the butterfly plate sealing ring is no longer concentric with the rotation center of the valve seat sealing ring on the valve body, but the rotation center of the butterfly plate sealing ring moves down, which causes the valve to jam when it is closed, and even more The result is that the valve cannot achieve the closing function, and ultimately there is a certain potential safety risk for operating conditions such as LNG receiving stations. In addition, the prior art butterfly valve for LNG receiving station does not have a static conductive structure design. Since the axial seal of the valve stem adopts non-metallic polymer materials, static electricity will be generated due to the friction between the valve stem and the polymer packing when the valve is opened and closed. If the static electricity cannot be conducted away in time, there are potential safety hazards.

technical problem

The technical problem to be solved by the present invention is to provide an ultra-low temperature butterfly valve that prevents jamming and static electricity from occurring when the valve is opened and closed.

Technical solutions

An ultra-low temperature butterfly valve includes a valve body, a butterfly plate, an axial limit block, a valve stem, a valve cover, and a lower end cover. The shaft holes at both ends of the valve body are respectively provided with axial limit holes in the direction of the passage. Both ends of the shaft hole of the plate are provided with axial limit platforms, and the axial limit blocks are respectively installed between the axial limit holes at both ends of the valve body and the axial limit platforms at both ends of the butterfly plate to perform Axial limit.

Further, the tail end of the valve stem is a free end, the head of the valve stem is provided with an anti-flying step, and the inner side of the valve cover is provided with an anti-flying step.

Further, the gap between the anti-fly-out step on the head of the valve stem and the anti-fly-out step on the inner side of the valve cover is 4-6 mm.

Further, an electrostatic conductive spring is provided between the lower end cover and the valve stem.

Beneficial effect

The beneficial effect of adopting the above technical scheme is that the butterfly plate is axially limited, and the valve stem shrinks in the direction of the axial limit block when the valve stem is contracted, which eliminates the phenomenon that the butterfly valve can not be opened or closed due to cold shrinkage. The spring guides the static electricity to the lower end cover, and then leads it into the ground through the on-site static electricity guiding device to eliminate the hidden danger of static electricity.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

In the figure: 1. Axial limit hole of the valve body; 2. Axial limit block; 3. Axial limit platform of the butterfly plate; 4. Free end of the stem of the valve stem; 5. The head of the valve stem does not fly out of the step; 6. Valve cover limit step; 7. Lower end cover; 8. Anti-static spring; 9. Valve body; 10. Valve stem; 11. Butterfly plate; 12. Valve cover.

The best mode of the invention

As shown in the figure, an ultra-low temperature butterfly valve includes a valve body, a butterfly plate, an axial limit block, a valve stem, a valve cover, and a lower end cover. The shaft holes at both ends of the valve body are respectively provided with axial limiters in the direction of the passage. Axial limit platforms are provided at both ends of the shaft hole of the butterfly plate, and the axial limit blocks are respectively installed between the axial limit holes at both ends of the valve body and the axial limit platforms at both ends of the butterfly plate , The butterfly plate is axially limited, the tail end of the valve stem is a free end, the head of the valve stem is provided with an anti-flying step, the inner side of the valve cover is provided with an anti-flying step, the head of the valve stem The gap between the anti-flying step and the inner anti-flying step of the valve cover is 4-6mm, and a static electricity conducting spring is arranged between the lower end cover and the valve stem.

Claims

An ultra-low temperature butterfly valve, comprising a valve body, a butterfly plate, an axial limit block, a valve stem, a valve cover, and a lower end cover, characterized in that the shaft holes at both ends of the valve body are respectively provided with axial limit holes in the direction of the passage , Both ends of the shaft hole of the butterfly plate are provided with axial limiting platforms, and the axial limiting blocks are respectively installed between the axial limiting holes at both ends of the valve body and the axial limiting platforms at both ends of the butterfly plate, The butterfly plate is axially limited.
The ultra-low temperature butterfly valve according to claim 1, wherein the tail end of the valve stem is a free end, the head of the valve stem is provided with an anti-flying step, and the inner side of the valve cover is provided with an anti-flying step.
The ultra-low temperature butterfly valve according to claim 2, wherein the gap between the anti-fly-out step on the head of the valve stem and the anti-fly-out step on the inner side of the valve cover is 4-6 mm.
The ultra-low temperature butterfly valve according to claim 1, 2 or 3, characterized in that an electrostatic conductive spring is provided between the lower end cover and the valve stem.