CN2189244Y

CN2189244Y - Ball valve

Info

Publication number: CN2189244Y
Application number: CN 94207294
Authority: CN
Inventors: 徐光中
Original assignee: ELECTRONIC INSTRUMENTS MANUFACTURER YONGJIA COUNTY
Current assignee: ELECTRONIC INSTRUMENTS MANUFACTURER YONGJIA COUNTY
Priority date: 1994-03-12
Filing date: 1994-03-12
Publication date: 1995-02-08
Anticipated expiration: 2004-03-12

Abstract

The utility model relates to a ball valve which is composed of a valve cover, a valve body, a ball core, a left soft valve seat, a right soft valve seat, a soft cushion ring which is arranged on the combination surface of the valve cover and the valve body, etc. The utility model is characterized in that the parts of the outside of the left and the right soft valve seats, and the part of the radial outside of the soft cushion ring are respectively provided with a left and a right metal valve seats, and a rabbet lug boss and a rabbet surface. Consequently, the part of the valve seat and the part of the combination surface of the valve cover and the valve body respectively and instantly forms a soft and hard secondary seal structure, the ball valve continually keep the full-sealing function and the leakage preventing function, and the further enlargement of the fire hazard is prevented.

Description

Ball valve

The utility model relates to a kind of ball valve.

All ball valves, the left and right soft valve seat that all adopts nonmetal soft sealing material to make forms two-way soft seal valve seat construction with the ball core, and adopt soft washer that nonmetal soft sealing material makes to form on the junction plane of valve body to clamp soft sealing structure at valve gap, generally adopt this nonmetallic material of teflon to make soft valve seat and soft washer at present, this material is corrosion-resistant, but non-refractory, more not fire-resistant, in case run into accidental fire, soft sealing structure will be burnt, ball valve loses at once and cuts off and anti-function of letting out, and causes the expansion of fire.

The purpose of this utility model provides a kind of hermetically sealed and ball valve anti-leak function of still keeping under the situation of fire.

Just compress the left and right metal seat valve of sealing with the ball core in the arranged outside of left and right soft valve seat after left and right soft valve seat burns, the seam face and the seam boss that just compress sealing after valve gap is arranged on soft washer with the soft washer radial outside position of valve body and burns mutually can achieve the above object.

Further illustrate detailed content of the present utility model below in conjunction with drawings and Examples.

Accompanying drawing is a structure diagram of the present utility model.

As shown in the figure, ball valve is by valve gap 1, valve body 2, ball core 3, valve shaft 4 and valve shaft sealing device 5 are formed, valve gap 1 is assembled into one with valve body 2 by fastening piece 6, on the junction plane of valve gap 1, be provided with soft washer 7 with valve body 2, ball core 3 forms two-way soft sealing structure with left soft valve seat 8 that is separately positioned on ball core 3 both sides and right soft valve seat 9, structure characteristic of the present utility model is that the arranged outside of soft valve seat 8 and right soft valve seat 9 on a left side is on a left side, just compress the left metal seat valve 10 and the right metal seat valve 11 of sealing after right soft valve seat 8 and 9 burns, after the soft washer 7 radial outside positions of valve gap 1 and valve body 2 are arranged on soft washer 9 and burn, just compress the seam face 12 and the seam boss 13 of sealing mutually with ball core 3.Because ball valve is split type valve, in order to guarantee to be located at the left metal seat valve 10 same concentricitys that are located at the right metal seat valve 11 on the valve body 2 on the valve gap 1, should become datum hole to cooperate with the hole axle matching design at seam face 12 places seam boss 13 with the location of positioning shaft, in addition, at soft valve seat 8,9 and after soft washer 7 burns, metal seat valve 10, can 11 compress sealing with ball core 3 and seam boss 13 with seam face 12, depend on

metal seat valve

10,11 with reaching the spring force that seam boss 13 is discharged with gap length between the seam face 12 and fastening piece 6 medi-spring packing rings between the ball core 3, therefore, in specific design, to determine the pretightening force of appropriate gap value and fastening piece at specific product.

The essence of above-mentioned ball-valve structure is to form soft, hard secondary valve seat sealing configuration and soft, hard secondary clamping sealing configuration, under the situation of fire, in case soft sealing structure destroys, hard sealing structure is set up at once, thereby make ball valve continue to keep the function of hermetically sealed and anti-leak, prevent that fire from further enlarging.

Claims

1, a kind of ball valve, have valve gap, valve body, ball core, left soft valve seat, right soft valve seat, valve shaft and valve shaft sealing device, on the junction plane of valve gap, be provided with soft washer with valve body, it is characterized in that: be provided with left metal seat valve (10) and the right metal seat valve (11) that after left and right soft valve seat (8,9) burns, just compresses sealing in the outside of soft valve seat in a left side (8) and right soft valve seat (9), be provided with seam face (12) and the seam boss (13) that after soft washer (7) burns, just compresses sealing mutually at soft washer (7) the radial outside position of valve gap (1) and valve body (2) with ball core (3).