阅读说明：本技术 一种超大口径球阀密封结构 (Ultra-large-diameter ball valve sealing structure ) 是由 陆怡 徐庆杰 张杨杨 于 2018-07-11 设计创作，主要内容包括：本发明涉及阀门制造技术领域,具体地说,是一种超大口径球阀密封结构,作用于阀体和延长管之间,包括三层密封板,从延长管至阀体依次为第一密封板、第二密封板和第三密封板,第一密封板的厚度大于第二密封板的厚度,第一密封板的厚度小于第三密封板的厚度,第一密封板的上下两端设置有平垫,第二密封板的上下两端设置有蝶形弹簧,第三密封板的上下两端连接有L型的球垫座,球垫座上设置有球垫,球垫与延长管的接触位置设置有垫圈,第一密封板、第二密封板与第三密封板采用聚四氟乙烯材料制成,本发明的密封性好,安全系数高,且使用寿命长。(The invention relates to the technical field of valve manufacturing, in particular to a sealing structure of an ultra-large-diameter ball valve, which acts between a valve body and an extension pipe and comprises three layers of sealing plates, wherein a first sealing plate, a second sealing plate and a third sealing plate are sequentially arranged from the extension pipe to the valve body, the thickness of the first sealing plate is larger than that of the second sealing plate, the thickness of the first sealing plate is smaller than that of the third sealing plate, flat gaskets are arranged at the upper end and the lower end of the first sealing plate, belleville springs are arranged at the upper end and the lower end of the second sealing plate, L-shaped ball gasket seats are connected at the upper end and the lower end of the third sealing plate, ball gaskets are arranged on the ball gasket seats, gaskets are arranged at the contact positions of the ball gaskets and the extension pipe, and the first sealing plate, the second sealing plate and the third.)

1. The utility model provides a super large-diameter ball valve seal structure, acts on between valve body and the extension pipe, its characterized in that includes the three-layer closing plate, is first closing plate, second closing plate and third closing plate from extension pipe to valve body in proper order, first closing plate thickness is greater than the thickness of second closing plate, first closing plate thickness is less than the thickness of third closing plate, the upper and lower both ends of first closing plate are provided with the flat pad.

2. The ultra large diameter ball valve sealing structure according to claim 1, wherein the upper and lower ends of the second sealing plate are provided with belleville springs.

3. The ultra-large-caliber ball valve sealing structure according to claim 2, wherein the upper end and the lower end of the third sealing plate are connected with L-shaped ball cushion seats, and ball cushions are arranged on the ball cushion seats.

4. The ultra large diameter ball valve sealing structure according to claim 3, wherein a gasket is disposed at a contact position of the ball pad and the extension pipe.

5. The ultra large diameter ball valve sealing structure according to any one of claims 1 to 4, wherein the first sealing plate, the second sealing plate and the third sealing plate are made of polytetrafluoroethylene material.

Technical Field

The invention relates to the technical field of valve manufacturing, in particular to a sealing structure of an ultra-large-diameter ball valve.

Background

Valves are plumbing accessories used to open and close a pipe, control flow direction, regulate and control parameters of the transport medium (temperature, pressure and flow). According to their function, they can be classified into shut-off valves, check valves, regulating valves, and the like. The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like.

The valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like. The valves are further classified into cast iron valves, cast steel valves, stainless steel valves (201, 304, 316, etc.), chrome molybdenum steel valves, chrome molybdenum vanadium steel valves, dual-phase steel valves, plastic valves, nonstandard valves, etc. according to the material.

The valve seat of the ball valve is composed of a Teflon carbide sealing ring and a disk spring, so that the ball valve has strong adaptability to pressure and temperature changes, and cannot generate any leakage slip in the range of marked pressure and temperature. The integral welded ball valve is generally formed by pressing a carbon steel seamless steel pipe, has good sealing performance and corrosion resistance, and is widely applied to the field of long-distance pipelines such as natural gas, petroleum, heat supply, chemical engineering, thermal power grids and the like. However, the existing ball valve has great limitation and cannot meet the requirement of modern industrial production.

At present, the demand of ultra-large-diameter all-welded ball valves for long-distance pipelines of heat supply projects in various big cities is increased day by day, and due to the limitation of domestic technology and manufacturing level, required valves are mainly imported, so that the project cost is increased.

Disclosure of Invention

The invention aims to provide a sealing structure of an ultra-large-diameter ball valve, which has good sealing property and high safety factor.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a super large-diameter ball valve seal structure, acts on between valve body and the extension pipe, includes the three-layer sealing plate, is first closing plate, second closing plate and third closing plate from the extension pipe to the valve body in proper order, and the thickness of first closing plate is greater than the thickness of second closing plate, and the thickness of first closing plate is less than the thickness of third closing plate, and the upper and lower both ends of first closing plate are provided with the flat pad, and the upper and lower both ends of second closing plate are provided with disc spring.

The invention is further improved, the upper end and the lower end of the third sealing plate are connected with L-shaped ball cushion seats, and ball cushions are arranged on the ball cushion seats.

In a further improvement of the invention, a gasket is arranged at the contact position of the ball pad and the extension pipe.

In a further improvement of the invention, the first sealing plate, the second sealing plate and the third sealing plate are made of polytetrafluoroethylene materials.

The invention has the beneficial effects that: compared with the existing gas valve, the gas valve has the advantages of good sealing performance, high safety factor and long service life.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

In the figure, 1-extension pipe, 2-valve body, 3-first sealing plate, 4-second sealing plate, 5-third sealing plate, 6-flat gasket, 7-belleville spring, 8-ball gasket seat, 9-gasket and 10-ball gasket.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.