CN2493794Y

CN2493794Y - Leakage-resistant durable ball valve structure

Info

Publication number: CN2493794Y
Application number: CN 01246283
Authority: CN
Inventors: 陈志清; 周孝民; 章倪香
Original assignee: Ningbo Zhiqing Group Co ltd
Current assignee: Ningbo Zhiqing Group Co ltd
Priority date: 2001-06-30
Filing date: 2001-06-30
Publication date: 2002-05-29
Anticipated expiration: 2011-06-30

Abstract

A leakage-resistant durable ball valve structure includes a left valve body (1) and a right valve body (6) connected with each other to one body as well as a valve core (3) and a valve seat (2) arranged in the body. When the ball valve is in a closed state, the outer circle surface of the valve core (3) is contacted with the inner circle of the valve seat (2) and keeps a seal state. The contact position between the inner circle of the valve seat (2) and the outer circle surface of the valve core (3) is embeddedly provided with a seal ring (7) of elastic material protruding out of the surface. The contact position between the outer circle of the valve seat (2) and an inner wall of the valve bodies (1) and (6) is also embeddedly provided with a seal ring (7) of elastic material protruding out of the surface. Compared with the prior art, the vale seat of the utility model is contacted with the valve core and valve bodies through the seal rings of elastic material embeddedly provided on the valve seat with a small contact area, thereby the specific pressure is increased with the same compression amount so as to ensure seal absolutely.

Description

A kind of Leakless durable ball valve structure

The utility model relates to the ball-valve structure of a kind of ball-valve structure, particularly a kind of durable leakproof.

Present ball valves that adopt on pipeline such as industry and civilian water, steam, liquefied petroleum gas, coal gas, natural gas, light oil, diesel oil, gasoline and relevant device, its major advantage are that switch is rapid, easy to operate, fluid resistance is little more, simple in structure; Existing ball valve generally comprises valve seat, the spool in valve body and the valve body, it is spherical that spool roughly is, drive valve seat rotation relatively by valve rod, when the through hole on the spool relative with the import and export of valve body when straight, valve just is in open mode, otherwise spool just cuts off the import and export of valve seat, and valve then is in closed condition;

In existing ball valve, valve seat is made by sealing material, generally adopts teflon or based on the composite material of teflon, spool adopts the cast steel ball more, sealing contact surface between valve seat and the spool is concave spherical surface and the protruding sphere that coincide mutually, compresses sealing for rigidity between the two; As everyone knows, the spool of ball valve and the motive sealing between the valve seat seal by existing certain specific pressure (power that is subjected on the unit area) between the two, this specific pressure produces when ball valve is tightened valve gap between erecting stage, when just having assembled, ball valve finishes and when being in closed condition, specific pressure value between the two is a maximum value, in use this specific pressure value only can reduce later on, can not increase, and this sealing means between existing spool and the valve seat surface of contact is bigger between the two, therefore specific pressure also just is not easy to improve, generally guarantee sealing by the mode that strengthens crush and the junction plane that increases sealing, so just cause ball valve opening, in the process of closing, frictional force is quite big, sealing gasket is easy to generate distortion after using a period of time, thereby stuck phenomenon takes place, and sealing gasket and spool, also can produce the gap between sealing gasket and the valve body and leak, sealing is difficult to guarantee that life of product is short.

The purpose of this utility model with regard to be to provide at above-mentioned prior art present situation a kind of switch moment little, be difficult for stuck Leakless durable ball valve structure.

The purpose of this utility model is achieved in that Leakless durable ball valve structure comprises the left and right sides valve body that interconnects one and the spool that is positioned at it, valve seat, when ball valve is in the complete shut-down state, the phase mutual connection touches and keeps sealing state in spool outer circumferential face and the valve seat, it is characterized in that the contacting point of Zhou Zaiyu spool outer circumferential face is embedded with in the described valve seat to protrude from its surperficial elastic material seal ring.

Better, described valve seat periphery also is embedded with in the contacting point with valve interior wall and protrudes from its surperficial elastic material seal ring.

Described elastic material can adopt rubber.

Compared with prior art, valve seat of the present utility model contacts with spool, valve body with the elastic material seal ring that is embedded thereon, and area of contact is little, so same crush, and specific pressure then increases, thereby absolute the assurance seals; And, as then wear resistance, the rebound degree than teflon is all good to select rubber for use, can compensate automatically, makes valve be in the state of elastic packing always, the rubber temperature influence is also little simultaneously.

Description of drawings.

Fig. 1 is the utility model embodiment's a structure cross-sectional schematic.

Fig. 2 is the utility model embodiment's stereoscopic figure.

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 1, shown in 2, Leakless durable ball valve structure comprises the left and right sides valve body 1 that interconnects one, 6 and be positioned at its spool 3, valve seat 2, it is spherical that spool 3 roughly is, drive valve seat 2 rotations relatively by handle 5 through valve rod 4, when ball valve is in the complete shut-down state, the phase mutual connections touch and keep sealing state in spool 3 outer circumferential faces and the valve seat 3, the contacting point of Zhou Zaiyu spool 3 outer circumferential faces is embedded with and protrudes from its surperficial elastic material seal ring 7 in the described valve seat 2, simultaneously described valve seat 2 peripheries with valve body 1, the contacting point of 6 inwalls also is embedded with and protrudes from its surperficial elastic material seal ring 8.

Described elastic material can adopt rubber or other materials.

Claims

1. Leakless durable ball valve structure, comprise left and right sides valve body that interconnects one and the spool that is positioned at it, valve seat, when ball valve is in the complete shut-down state, the phase mutual connection touches and keeps sealing state in spool outer circumferential face and the valve seat, it is characterized in that the contacting point of Zhou Zaiyu spool outer circumferential face is embedded with in the described valve seat to protrude from its surperficial elastic material seal ring.

2. Leakless durable ball valve structure according to claim 1 is characterized in that described valve seat periphery is embedded with in the contacting point with valve interior wall to protrude from its surperficial elastic material seal ring.

3. Leakless durable ball valve structure according to claim 1 and 2 is characterized in that described elastic material is a rubber.