CN103953767B - Self-closing valves for use in gas delivery lines - Google Patents

Abstract

The invention discloses a kind of for the self-closing valve in gas transfer pipeline, comprise the valve body of the T-shaped structure be made up of gas-entered passageway, outlet passageway and control chamber, the top seal of control chamber is provided with valve gap, extend into valve rod lower end in control chamber from bonnet central and be arranged on gas-entered passageway and be fixedly connected with the spool in outlet passageway, the valve rod upper end be placed in outside valve gap is provided with Joystick; The valve rod being positioned at valve gap is set with torque spring, and the two ends of torque spring are connected with valve gap with valve rod respectively; On the valve rod near valve element position, flip sleeve is equipped with positioning plate, and the outer circumferential face of positioning plate is connected with control chamber inner wall sealing by elastic ring film; Be positioned at interval on the valve rod above positioning plate and be fixedly installed limiting board, the positioning boss that the opposing side of positioning plate and limiting board offers location dimples respectively and matches with its position.The invention has the advantages that structure is simple, the function that can automatically close after dying can be realized.

Description

Self-closing valves for use in gas delivery lines

technical field

The invention relates to valves, in particular to a self-closing valve used in gas delivery pipelines.

Background technique

The transportation of gas through pipelines is a common way in production and life. For example, the gas used in people's life is transported to thousands of households through pipelines, and some high-pressure and even dangerous gases are also transported through pipelines. In real life, gas has become an essential energy source in people's daily life. Due to people's lack of knowledge about the safe use of these gases, and even lack of awareness of safety precautions for the use of these dangerous gases, many unnecessary losses and accidents have been caused. Especially when the gas is suddenly stopped, it often happens that the user does not close the valve in time or forgets to close the valve. When the normal gas supply is restored, it is easy to cause a gas leakage accident.

At present, most of the existing gas delivery valves do not have the function of automatic closing after the gas is cut off, and the production cost is high, the installation is difficult, the closing effect is not good, and the reliability is poor. Some valves cannot adjust the opening and closing degree, and only have two states of open and closed. Defects have brought inconvenience and potential safety hazards to the delivery and use of gases, especially dangerous gases.

Contents of the invention

The object of the present invention is to provide a self-closing valve used in the gas delivery pipeline with convenient operation and reliable sealing.

To achieve the above object, the present invention can take the following technical solutions:

The self-closing valve used in the gas delivery pipeline according to the present invention comprises a valve body with a T-shaped structure consisting of an air inlet passage, an air outlet passage and a control chamber, and a valve cover is sealed on the upper part of the control chamber , the lower end of the valve stem extending from the center of the valve cover into the control chamber is fixedly connected to the valve core arranged in the air inlet passage and the air outlet passage, and the upper end of the valve stem placed outside the valve cover is provided with a control handle; A torsion spring is sleeved on the valve stem located in the valve cover, and the two ends of the torsion spring are respectively connected with the valve stem and the valve cover; a positioning plate is slidingly sleeved on the valve stem close to the position of the valve core, so that The outer peripheral surface of the positioning plate is sealed and connected with the inner wall of the control chamber through an elastic ring film; the valve stem above the positioning plate is fixedly provided with a limiting plate at intervals, and there are respectively provided on the opposite surfaces of the positioning plate and the limiting plate. Locating recesses and locating bosses matching their positions.

The height of the positioning boss is 3-7mm.

The elastic ring membrane is a stainless steel diaphragm with a thickness of 0.02~0.3mm, and other metal pressure diaphragms can also be used according to needs, such as HC/HB (Hastelloy), Ta (tantalum), Ti (titanium), paste PTFE (polytetrafluoroethylene), Monel and other diaphragms.

The valve core is a hemispherical structure.

A sealing ring is arranged on the joint surface of the valve cover and the valve body.

The shape of the positioning pit and the positioning boss is a hemispherical shape adapted to each other.

A plurality of positioning pits are evenly spaced on the upper surface of the positioning plate, and a plurality of positioning bosses are evenly spaced on the lower surface of the limiting plate.

The invention has the advantages of simple structure, which can realize the function of automatic closing after the gas is cut off, effectively prevents the accident of gas leakage after the gas is forgotten to be closed after the gas is cut off, and at the same time, the rotation angle of the valve core is adjusted according to the rotation angle of the control handle. Different, so as to change the flow area of the gas, to achieve the purpose of adjusting the gas flow, especially suitable for use as a control valve in the pipeline of dangerous gas such as natural gas.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention when it is closed.

Fig. 2 is a schematic diagram of the structure of the present invention when it is opened.

Fig. 3 is a schematic structural view of the positioning plate in Fig. 1 .

Fig. 4 is a schematic structural diagram of the limiting plate in Fig. 1 .

detailed description

As shown in Figures 1-4, the self-closing valve used in the gas delivery pipeline according to the present invention includes a T-shaped valve body composed of an inlet passage 1, an outlet passage 2 and a control chamber 3. The upper part of the control chamber 3 is sealed with a valve cover 4, and a sealing ring 12 is provided on the joint surface of the valve cover 4 and the valve body; The hemispherical valve core 6 in the channel 1 and the outlet channel 2 is fixedly connected; the upper end of the valve stem 5 placed outside the valve cover 4 is provided with a control handle 7; the valve stem 5 located in the valve cover 4 is covered with a torsion spring 8 , the two ends of the torsion spring 8 are connected with the valve stem 5 and the valve cover 4 respectively; a positioning plate 9 is slidably set on the valve stem 5 near the position of the valve core 6, and the outer peripheral surface of the positioning plate 9 is connected with the stainless steel elastic ring film 10 The inner wall of the control chamber 3 is sealed and connected; the valve stem 5 above the positioning plate 9 is fixedly provided with a limiting plate 11 at intervals, and a plurality of hemispherical positioning pits 13 are evenly distributed on the upper surface of the positioning plate 9. On the limiting plate 11 A plurality of hemispherical positioning bosses 14 corresponding to the positions of the positioning pits 13 are evenly distributed on the lower surface. , keep a gap of about 1 mm between the top of the positioning boss 14 arranged on the lower surface of the limiting plate 11 and the upper surface of the positioning plate.

During actual manufacture, the positioning pit 13 can also be provided on the limiting plate 11, and at this time, the positioning boss 14 is arranged on the positioning plate 9, which can also achieve the same effect.

In the process of normal gas delivery, the control handle 7 is rotated at an appropriate angle, and the valve stem 5 is also rotated at a corresponding angle, thereby driving the valve core 6 to rotate to open the valve. The elastic ring film 10 exerts pressure to push up the elastic ring film 10, and the elastic ring film 10 drives the positioning plate 9 to move upward for a certain distance, and contacts with the limiting plate 11, and the positioning boss 14 on the lower surface of the limiting plate 11 snaps into position In the positioning pit 13 on the upper surface of the plate 9, the valve remains open; when the gas is suddenly cut off during the gas delivery process, no gas exerts pressure on the elastic ring film 10, and the elastic ring film 10 descends, thereby driving the positioning plate 9 to also fall, positioning Plate 9 is separated from limit plate 11, and at this moment torsion spring 8 can pull valve stem 5 to return to the original position, and valve core 6 also returns to closed state with valve stem 5 rotation, and valve is closed.

As the rotation angle of the control handle 7 changes, the rotation angle of the valve stem 5 also changes, and the hemispherical positioning boss 14 on the limiting plate 11 is correspondingly snapped into the different hemispherical positioning pits 13 on the positioning plate 9 , so that the rotation angle of the hemispherical valve core 6 changes, changing the flow area of the gas flow, so as to achieve the purpose of regulating the gas flow.

Claims (7)

1. one kind for the self-closing valve in gas transfer pipeline, comprise the valve body of the T-shaped structure be made up of gas-entered passageway (1), outlet passageway (2) and control chamber (3), the top seal of described control chamber (3) is provided with valve gap (4), extend into valve rod (5) lower end in control chamber (3) from described valve gap (4) center and be arranged on described gas-entered passageway (1) and be fixedly connected with the spool (6) in outlet passageway (2), be placed in described valve gap (4) valve rod outward (5) upper end and be provided with Joystick (7); It is characterized in that: the valve rod (5) being positioned at described valve gap (4) is set with torque spring (8), and the two ends of described torque spring (8) are connected with valve gap (4) with valve rod (5) respectively; At the upper flip sleeve of the valve rod (5) near described spool (6) position, positioning plate (9) is housed, the outer circumferential face of described positioning plate (9) is connected with described control chamber (3) inner wall sealing by elastic ring film (10); The upper interval of valve rod (5) being positioned at positioning plate (9) top is fixedly installed limiting board (11), and described positioning plate (9) with the opposing side of limiting board (11) offer location dimples and the positioning boss corresponding with its position respectively.

2. according to claim 1 for the self-closing valve in gas transfer pipeline, it is characterized in that: the height of described positioning boss is 3 ~ 7mm.

3. according to claim 1 for the self-closing valve in gas transfer pipeline, it is characterized in that: the stainless steel diaphragm that described elastic ring film (10) is thickness 0.02 ~ 0.3mm.

4. according to claim 1 for the self-closing valve in gas transfer pipeline, it is characterized in that: described spool (6) is hemispherical dome structure.

5. according to claim 1 for the self-closing valve in gas transfer pipeline, it is characterized in that: the junction plane of described valve gap (4) and valve body is provided with seal ring (12).

6. according to claim 1 for the self-closing valve in gas transfer pipeline, it is characterized in that: the shape of described location dimples and positioning boss is coadapted hemisphere.

7. according to claim 1 for the self-closing valve in gas transfer pipeline, it is characterized in that: described positioning plate (9) upper surface offers multiple location dimples (13) uniformly at intervals, be provided with multiple positioning boss (14) uniformly at intervals at described limiting board (11) lower surface.