Low-temperature stop valve

Abstract

The utility model discloses a low-temperature stop valve which comprises a valve body and a valve rod installed on the valve body. A mounting groove for mounting a sealing ring is formed in one end, facing the valve body, of the valve rod; the mounting groove comprises a first conical surface and a second conical surface; wherein an opening of the first conical surface shrinks inwards from top to bottom in the radial direction of the valve rod and then is connected with the second conical surface, and the second conical surface expands outwards from top to bottom in the radial direction of the valve rod. The opening of the first conical surface is connected with the second conical surface after being shrunk inwards from top to bottom, and the second conical surface is expanded outwards from top to bottom, so that the sealing ring is easy to be pressed and embedded into the mounting groove and has stable sealing performance, and meanwhile, the selected sealing ring PCTFE has excellent performance at low temperature, so that the service life of the sealing ring is prolonged, and the service life of the sealing ring is prolonged. After the sealing ring is installed in the installation groove, line contact sealing is formed between the sealing ring and the installation groove, and therefore reliable face sealing can be formed even if the valve continues to be closed at the uneven position of a line contact point at the low temperature.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely is a low temperature stop valve. BACKGROUND

[0002] The stop valve is opened / cut off on the pipeline, and the soft sealing low temperature stop valve is used for the medium flow to flow through the sealing surface from the valve seat below, the ordinary soft sealing low temperature stop valve, the brittleness of the soft sealing material PTFE increases at low temperature, the deformation amount reduces, the sealing surface is the face-to-face cooperation, and the required sealing specific pressure is relatively large, and any point uneven can cause the sealing to be not tight at low temperature, for this, it is necessary to improve the sealing performance of the soft sealing low temperature stop valve to solve the above problems. SUMMARY

[0003] The utility model discloses a low temperature stop valve to solve the problems in the background art.

[0004] In order to achieve the above object, the utility model provides the following technical scheme: a low temperature stop valve, including the valve body, install the valve rod on the valve body, the valve rod one end of facing the valve body is equipped with the installation groove for installing the sealing ring, the installation groove includes the first taper and the second taper, wherein, the first taper's opening is from top to bottom, and after the inside shrinkage along the radial of the valve rod, it is connected with the second taper, and the second taper is from top to bottom along the radial of the valve rod and expands outward.

[0005] As the preferred technical scheme of the utility model: the taper of the first taper is a, and the taper of the second taper is b, wherein, b < a < 50 DEG.

[0006] As the preferred technical scheme of the utility model: the taper of the first taper is a, and the taper of the second taper (5) is b, wherein, a-b=16 DEG.

[0007] As the preferred technical scheme of the utility model: the taper of the first taper is a, and the taper of the second taper is b, wherein, a=30 DEG, b=14 DEG.

[0008] The utility model discloses the beneficial effects in the above technical scheme are: because the first taper's opening is from top to bottom and inwards and is connected with the second taper after the inside shrinkage, and the second taper expands outward from top to bottom, so that the sealing ring is easy to press into the installation groove, and has stable sealing performance, and the selected sealing ring PCTFE has excellent performance at low temperature, and the line contact sealing is formed between the sealing ring and the installation groove after the sealing ring is installed in the installation groove, so that even if there is uneven place at the line contact point at low temperature, the reliable face seal can be formed by continuing to close the valve. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the main body structure schematic view of the utility model;

[0010] Figure 2 It is Figure 1 It is the local enlarged view of A in the middle;

[0011] Figure 3 It is the local enlarged view of the valve rod of the utility model.

[0012] In the drawing: 1, valve body; 2, valve rod; 3, sealing ring; 4, first conical surface; 5, second conical surface; 6, installation groove. DETAILED DESCRIPTION

[0013] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation on the utility model. In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "upper surface" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0014] Please refer to Figures 1-3 The utility model provides an embodiment: a low temperature stop valve, including valve body 1, install on valve body 1 on valve rod 2, the one end of valve rod 2 faces valve body 1 is equipped with the installation groove 6 for installing sealing ring 3, installation groove 6 includes first conical surface 4 and second conical surface 5, wherein the opening of first conical surface 4 is from top to bottom, and after being contracted along the radial direction of valve rod 2, it is connected with second conical surface 5, and second conical surface 5 is expanded along the radial direction of valve rod 2 from top to bottom.

[0015] Further, the taper of first conical surface 4 is a, and the taper of second conical surface 5 is b, wherein b

[0016] Further, the taper of first conical surface 4 is a, and the taper of second conical surface 5 is b, wherein a-b=16 °.

[0017] Specifically, the taper of the first taper surface 4 is a, and the taper of the second taper surface 5 is b; wherein, a=30°, b=14°.

[0018] In summary, since the opening of the first taper surface 4 is contracted inward from top to bottom and then connected with the second taper surface 5, and the second taper surface 5 is expanded outward from top to bottom, the sealing ring 3 is easily embedded into the installation groove 6, and has stable sealing performance, and the selected sealing ring PCTFE has excellent performance at low temperature, and the linear contact sealing is formed between the sealing ring 3 and the installation groove 6 after the sealing ring 3 is installed in the installation groove 6, so that even if there are uneven places at the linear contact point at low temperature, the reliable surface sealing can be formed after the valve is continuously closed.

[0019] The embodiments of the utility model are described in detail in combination with the drawings, but the utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and still fall within the protection scope of the utility model.

Claims

1. A cryogenic shut-off valve, characterized in that: Includes a valve body (1) and a valve stem (2) mounted on the valve body (1); The valve stem (2) has a mounting groove (6) for installing a sealing ring (3) at one end facing the valve body (1). The mounting groove (6) includes a first conical surface (4) and a second conical surface (5); wherein the opening of the first conical surface (4) is from top to bottom and shrinks inward along the radial direction of the valve stem (2) to connect with the second conical surface (5), and the second conical surface (5) expands outward along the radial direction of the valve stem (2) from top to bottom.

2. The cryogenic shut-off valve according to claim 1, characterized in that: The taper of the first conical surface (4) is a, and the taper of the second conical surface (5) is b; where b < a < 50°.

3. A cryogenic shut-off valve according to claim 2, characterized in that: The taper of the first conical surface (4) is a, and the taper of the second conical surface (5) is b; where ab = 16°.

4. A cryogenic shut-off valve according to claim 3, characterized in that: The taper of the first conical surface (4) is a, and the taper of the second conical surface (5) is b; where a = 30° and b = 14°.

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