Air bag sealed stainless steel hemispherical valve

Abstract

The invention belongs to the technical field of hemisphere valves, and relates to an air bag closed type stainless steel hemisphere valve. The air bag closed type stainless steel hemisphere valve is characterized in that an air bag compression ring is fixed to a valve body by a bolt; an annular groove is formed between the valve body and the air bag compression ring, and is internally provided with an air bag sealing element consisting of a sealing ring and an annular sealing gasket; a hemisphere valve core is mounted on driving shafts of the opposite side walls of the valve body, and is in clearance fit with the valve body, the air bag sealing element and the air bag compression ring; when the valve core is opened or closed, no abrasion occurs; the air bag closed type stainless steel hemisphere valve can exert a sealing function only when the air bag sealing element is internally inflated and swells to be tightly combined with the spherical surface of the valve core; the lower part of the annular sealing gasket is matched with a U-shaped groove of the sealing ring to form a sealed inflating cavity; and an air inlet channel communicated with the annular groove is formed in the side wall of the air bag compression ring, and is in sealing connection with a ventilation guide pipe, penetrating through the annular sealing gasket to extend into the inflating cavity, at an opening of the annular groove. The air bag closed type stainless steel hemisphere valve has the advantages that the air bag closed type stainless steel hemisphere valve is simple in structure, and good in sealability, and is suitable for feeding valves and discharge valves in the pharmaceutical industry.

Description

technical field [0001] The invention belongs to the technical field of ball valves, in particular to an air bag-sealed stainless steel hemispherical valve. Background technique [0002] Stainless steel hemispherical valve application air bag sealing device in the pharmaceutical industry, food industry fully meet the requirements of vacuum resistance, pressure resistance sealing and "GMP" sanitary ball valve, its function is: stable sealing performance, long service life, easy maintenance, can be According to the requirements of the product, different sealing materials are selected, which are suitable for crystals, powder particles and pasty materials of various densities. [0003] At present, the feed and discharge valves used in vacuum dryers in the pharmaceutical industry are "stainless steel eccentric hemisphere valves" (stainless steel refers to the material, and eccentric hemisphere refers to the structure of the valve). For example, the "conical ribbon vacuum dryer" p...

AI Technical Summary

Problems solved by technology

For example, the "conical ribbon vacuum dryer" produced by "Zhejiang Chengxin Medical Equipment Co., Ltd." is equipped with a "stainless steel eccentric hemispherical valve". The sealing structure of the eccentric hemispherical valve is to use the hemispherical valve rotation shaft When the hemispherical valve rotates and closes, under the action of the eccentric shaft distance, the valve core presses upwards against the sealing surface on the valve seat, so as to meet the sealing requirements of the valve. The eccentric hemispherical valve is designed for powdery and granular materials. The special valve has the advantages of no material accumulation, no dead angle, and easy cleaning. These advantages are suitable for the application in the pharmaceutical industry. The disadvantage is that displacement friction and friction will occur between the spherical surface of the valve core and the sealing surface of the valve seat when it is opened and closed. It will produce powder particles, which will contaminate products, especially pharmaceutical products. Stainless steel eccentric hemispherical valves do not meet the requirements for use on GMP sanitary products

[0004] CN 203963089 U discloses "A Dome Valve", which includes a valve body, an airbag pressure ring, an inner ring, an elastic sealing ring, a hemispherical valve core, a tray, a sealing ring, upper bolts, side bolts, a rocker arm shell, a rocker The inner shaft of the arm, the rocker arm, the rotating shaft, the rotating shaft sleeve, the combined sealing ring, the end cover, the pneumatic actuator, the pneumatic actuator starts to move when it is powered on, the air in the elastic sealing ring is discharged from the exhaust hole, and the pneumatic actuator pushes the rocker arm to swing , the swing arm makes the hemispherical valve core start to rotate and open through the rotating shaft. During the rotation process, there is no contact between the spool and the sealing ring; When it is in the closed state, the air source supplies air to the elastic sealing ring. The disadvantages are: first, its sealing device is composed of valve body 1, air bag pressure ring 2, inner ring 3, elastic sealing ring 4, hemispherical valve core 5, Tray 6, sealing ring 7, and bolt 8 are composed of complex structure; secondly, when the elastic sealing ring 4 is inflated through the inflation hole reserved on the airbag pressure ring 2 and the inner ring 3, the gas will flow from the upper surface and side surface of the inner ring 3 Then it leaks through the side surface and the lower surface of the elastic sealing ring 4, resulting in poor sealing effect

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