Linear and surface double-sealing stop valve

Abstract

The utility model relates to the technical field of valves, in particular to a line and surface double-sealing stop valve. The stop valve is basically the same as an existing stop valve in structure, the lower end of a valve clack is of a flat-bottom inverted cone structure, the vertex angle of the inverted cone is b degrees, the upper end of an inner hole of a valve seat is chamfered, the chamfer is of an inverted cone structure, and the vertex angle of the inverted cone is a degrees. A = 60 degrees, and b is less than a by about 1-2 degrees. The utility model has the beneficial effects that 1, the problems of short service life of single-line sealing and easy sealing leakage of single-face sealing are solved; and the sealing performance and the service life of the medium-and-large-caliber stop valve are improved. Meanwhile, the production cost is not increased. 2, compared with the original single-side sealing, the operation torque is reduced;

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a line, face double sealing stop valve. BACKGROUND

[0002] The existing stop product sealing type has two kinds, one is plane sealing, and the other is conical surface sealing. The plane sealing is suitable for horizontal installation pipeline. The stability of vertical installation and horizontal installation is not good, and leakage is prone to occur after a period of use. Meanwhile, the sealing surface directly faces the medium, and problems such as erosion and cavitation are prone to occur.

[0003] The existing conical surface sealing generally adopts 60° conical sealing surface for valve body or seat sealing and valve clack sealing, which can better avoid problems such as erosion and cavitation of the sealing surface and non-horizontal installation. However, for medium and large diameter products, the micro deformation of the sealing surface is large, and the deformation is uneven, and the single surface sealing is prone to sealing leakage, and the service life of the single line sealing is short. SUMMARY

[0004] The main purpose of the utility model is to provide a line, face double sealing stop valve, so as to effectively solve the problems in the background art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: a line, face double sealing stop valve, which is basically the same as the existing stop valve structure, characterized in that the lower end of the valve clack is a flat bottomed inverted cone structure, the top angle of the inverted cone is b degrees, the upper end of the inner hole of the valve seat is chamfered, the chamfer is an inverted cone structure, and the top angle of the inverted cone is a degrees.

[0006] Preferably, a = 60 degrees, and b is less than a by about 1-2 degrees.

[0007] During the closing process of the valve, the closing force of the valve rod 1 is transmitted to the valve clack 3 through the cushion block 2. During the contact process of the valve clack 3 and the sealing surface of the valve seat 4, the valve clack sealing band 5 contacts the lower edge of the valve seat sealing band 6 and forms a line seal. Then, with the increase of the operating force, the valve clack 3 moves downward and forms a micro deformation on the valve seat 4. The deformation is opposite to the deformation of the valve seat caused by the medium thrust and is offset. With the increase of the operating force, the valve seat sealing band 6 gradually approaches the valve clack sealing band 5, the angle difference gradually decreases, and finally the valve clack and the valve seat sealing band completely adhere to form a surface seal. The opening process is opposite to the above, and the surface seal is separated first, and then the line seal is separated.

[0008] The utility model has the advantages that: 1. The service life of the single line sealing is short, and the single surface sealing is prone to sealing leakage. The sealing performance and service life of the medium and large diameter stop valve are improved. Meanwhile, the production cost is not increased. 2. The operation torque is reduced compared with the original single surface sealing. BRIEF DESCRIPTION OF DRAWINGS

[0009] ATTACHFigure 1 It is a structure schematic view of the utility model.

[0010] It is a structure schematic view of the utility model. Figure 2 It is a structure schematic view of the utility model.

[0011] It is a structure schematic view of the utility model. Figure 3 It is a structure schematic view of the utility model.

[0012] It is a structure schematic view of the utility model. Figure 4 It is a structure schematic view of the utility model.

[0013] It is a structure schematic view of the utility model. Figure 1 In the figure, 1 is a valve stem, 2 is a cushion block, 3 is a valve disc, 4 is a valve seat, 5 is a valve disc sealing band, and 6 is a valve seat sealing band. PREFERRED EMBODIMENT

[0014] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0015] The line and surface double sealing stop valve is basically the same as the existing stop valve structure, and is characterized in that the lower end of the valve disc 3 is a flat bottomed inverted cone structure, the top angle of the inverted cone is b degrees, the upper end of the inner hole of the valve seat is an inverted cone structure, and the top angle of the inverted cone is a degrees.

[0016] The a=60 degrees, and the b=59 degrees.

[0017] During the closing process of the valve, the closing force of the valve stem 1 is transmitted to the valve disc 3 through the cushion block 2. During the contact process of the valve disc 3 and the sealing surface of the valve seat 4, the valve disc sealing band 5 contacts the lower edge of the valve seat sealing band 6 and forms a line seal. Then, with the increase of the operating force, the valve disc 3 moves downward and forms a slight deformation of the valve seat 4. The deformation is opposite to the deformation of the valve seat caused by the medium thrust and is offset. With the increase of the operating force, the valve seat sealing band 6 gradually approaches the valve disc sealing band 5, the angle difference gradually decreases, and the valve disc and the valve seat sealing band completely adhere to form a surface seal. The opening process is opposite to the above, and the surface seal is separated first, and then the line seal is separated.

[0018] Effects: 1. The service life of the single line seal is short, and the single surface seal is prone to sealing leakage. The sealing performance and service life of the medium and large diameter stop valve are improved. Meanwhile, the production cost is not increased. 2. The operation torque is smaller than that of the original single surface seal.

[0019] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A line and face double seal stop valve which is substantially identical in construction to existing stop valves, characterised in that: The lower end of the valve disc is a flat bottomed inverted cone structure, the top angle of the inverted cone is b degrees, the upper end of the inner hole of the valve seat is chamfered, the chamfer is an inverted cone structure, and the top angle of the inverted cone is a degrees; During contact between the sealing surface of the valve disc and the valve seat, the sealing band of the valve disc contacts the lower edge of the sealing band of the valve seat and forms a line seal, with the increase of the operating force, the valve disc moves downward, the sealing band of the valve seat gradually approaches the sealing band of the valve disc, the angle difference gradually reduces, and the sealing bands of the valve disc and the valve seat completely adhere to form a surface seal.

2. A double-seal globe valve according to claim 1, wherein: The a=60 degrees, and b is less than a by about 1-2 degrees.

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