Metal sealing valve seat assembly structure for ultralow-temperature ball valve

Abstract

The metal sealing valve seat assembly structure comprises a valve cover and a valve body, the circumferential inner wall of the valve body is fixedly connected with a valve seat, the valve body is internally and rotatably connected with a ball body, the outer surface of the ball body is provided with a reinforcing layer, the reinforcing layer is a hard alloy layer, the circumferential inner wall of the valve body is provided with a belleville spring, and the belleville spring is fixedly connected with the valve cover. One end of the belleville spring makes contact with the valve seat, a sealing gasket is arranged on the valve seat, two positioning cylindrical pins are connected between the valve deck and the valve body in an inserted mode, and a fastening bolt is connected between the valve deck and the valve body in a threaded and inserted mode. The reinforcing layer adopts the hard alloy layer, so that the problems of unstable sealing and leakage caused by cold shrinkage and elasticity loss of the sealing layer in a low-temperature environment can be avoided, and the service life of the ball valve in the low-temperature environment is prevented from being influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve technical field especially relates to a metal seal valve seat subassembly structure for super low temperature ball valve. BACKGROUND

[0002] Ball valve is a kind of valve by the opening and closing (ball) by the valve stem is driven, and rotates around the axis of the valve stem 90 degree movement, ball valve can be flexibly controlled medium on pipeline, confluence, shunt, and flow direction switching, because the machining precision of ball valve is very high, thus guaranteeing its sealing effect.

[0003] At present, the sealing of existing ball valve mostly utilizes nonmetallic sealing ring to seal, but nonmetallic sealing material is unstable in sealing and leaks due to cold shrinkage and loss of elasticity in low-temperature environment, thereby affecting the service life of ball valve in low-temperature environment. UTILITY MODEL CONTENTS

[0004] The utility model discloses a metal seal valve seat subassembly structure for super low temperature ball valve, which solves the problem of unstable sealing and leakage of nonmetallic sealing material in low-temperature environment due to cold shrinkage and loss of elasticity, thereby prolonging the service life of ball valve in low-temperature environment.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A metal seal valve seat subassembly structure for super low temperature ball valve, comprising a valve cover and a valve body, the valve body is fixedly connected with a valve seat on the circumferential inner wall, a ball is rotatably connected in the valve body, the outer surface of the ball is provided with a reinforcing layer, the reinforcing layer is a hard alloy layer, the circumferential inner wall of the valve body is provided with a disc spring, one end of the disc spring is in contact with the valve seat, and a sealing gasket is arranged on the valve seat.

[0007] Further, two positioning cylindrical pins are inserted between the valve cover and the valve body.

[0008] Further, a fastening bolt is threadedly inserted between the valve cover and the valve body.

[0009] Further, the hard alloy layer is formed by spray welding.

[0010] Further, the hard alloy layer is formed by surfacing.

[0011] The utility model has the advantages of:

[0012] 1. The hard alloy layer of the reinforcing layer can avoid the unstable sealing and leakage of the sealing layer in low-temperature environment due to cold shrinkage and loss of elasticity, thereby prolonging the service life of ball valve in low-temperature environment.

[0013] 2. Through the two ends of the disc spring and the valve seat and the valve body seal at the same time, thereby play auxiliary sealing effect, and can guarantee that the impurities in the medium do not enter the upper sealing surface, improve the service life. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 A cross-sectional structure schematic view of a metal sealing valve seat assembly structure for a super-low temperature ball valve is provided in the present application;

[0015] Fig. 2 An A enlarged structure schematic view of a metal sealing valve seat assembly structure for a super-low temperature ball valve is provided in the present application;

[0016] Fig. 3 A B enlarged structure schematic view of a metal sealing valve seat assembly structure for a super-low temperature ball valve is provided in the present application.

[0017] In the figure: 1, valve cover; 2, valve body; 3, fastening bolt; 4, positioning cylindrical pin; 5, valve seat; 6, ball; 7, reinforcing layer; 8, disc spring; 9, sealing gasket. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0019] Referring to Figs. 1-3 A metal sealing valve seat assembly structure for a super-low temperature ball valve comprises a valve cover 1 and a valve body 2, the valve body 2 is provided with a valve seat 5 fixed on the circumferential inner wall of the valve body 2 through a bolt, the valve body 2 is rotatably connected with a ball 6, the outer surface of the ball 6 is provided with a reinforcing layer 7, the reinforcing layer 7 is a hard alloy layer, so as to avoid the emergence of problems such as unstable sealing and leakage caused by cold shrinkage and loss of elasticity of the sealing layer in a low-temperature environment, the circumferential inner wall of the valve body 2 is provided with a disc spring 8, one end of the disc spring 8 is in contact with the valve seat 5, the two ends of the disc spring 8 are sealed with the valve seat 5 and the valve body 2 at the same time, thereby playing an auxiliary sealing effect, and the valve seat 5 is provided with a sealing gasket 9.

[0020] Two positioning cylindrical pins 4 are inserted between the valve cover 1 and the valve body 2, so as to facilitate the positioning and installation of the valve cover 1 and the valve body 2, and a fastening bolt 3 is threadedly inserted between the valve cover 1 and the valve body 2, so as to facilitate the fixation of the valve cover 1 and the valve body 2, the hard alloy layer is formed by spray welding, and the hard alloy layer is formed by surfacing.

[0021] The working principle of the embodiment is as follows: the positioning cylinder pin 4 is used to facilitate the positioning and installation of the valve cover 1 and the valve body 2, then the fastening bolt 3 is used to fix the valve cover 1 and the valve body 2, in use, the ball 6 rotates in the valve body 2 to realize the opening and closing of the ball valve, wherein the hard alloy layer is used in the design of the reinforcing layer 7 to avoid the sealing instability and leakage caused by the cold shrinkage and loss of elasticity of the sealing layer in the low temperature environment, then the two ends of the disc spring 8 are sealed with the valve seat 5 and the valve body 2 at the same time, thereby the auxiliary sealing effect is achieved, and the impurities in the medium cannot enter the upper sealing surface, and the service life is improved.

[0022] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A metal-to-metal sealing seat assembly structure for ultra-low temperature ball valves, comprising a bonnet (1) and a valve body (2), characterized in that, The valve body (2) is fixedly connected with a valve seat (5) on the circumferential inner wall, and a ball (6) is rotatably connected in the valve body (2), the outer surface of the ball (6) is provided with a reinforcing layer (7), the reinforcing layer (7) is a hard alloy layer, the circumferential inner wall of the valve body (2) is provided with a disc spring (8), one end of the disc spring (8) is in contact with the valve seat (5), and the valve seat (5) is provided with a sealing gasket (9).

2. A metal-to-metal sealing seat assembly structure for ultra-low temperature ball valves according to claim 1, characterized in that, Two positioning cylindrical pins (4) are inserted between the valve cover (1) and the valve body (2).

3. A metal-to-metal sealing seat assembly for ultra-low temperature ball valves according to claim 1, characterized in that, A fastening bolt (3) is threadedly inserted between the valve cover (1) and the valve body (2).

4. A metal-to-metal sealing seat assembly for ultra-low temperature ball valves according to claim 1, characterized in that, The hard alloy layer is formed by spray welding.

5. A metal-to-metal sealing valve seat assembly for ultra-low temperature ball valves according to claim 1, characterized in that, The hard alloy layer is formed by surfacing.

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