Improvement of thermal insulation ball pneumatic valve

with the continuous development of domestic industry, used on the pipeline insulation ball pneumatic valve demand also will increase, more and more is also high to the requirement of insulation ball pneumatic valve, the user selects the insulation ball pneumatic valve, did pay special attention to the pneumatic valve has good sealing performance to prevent the leakage of the medium. Due to import insulation ball better reliability of pneumatic valve, therefore the user to the more important parts of the insulation adopts imported pneumatic valve, ball but import insulation ball pneumatic valve is expensive, delivery cycle is long, after-sales service is not convenient, seriously affect the operation of the whole pipeline. In order to reduce the cost of pipeline, to achieve heat preservation of home-made pneumatic valve ball, domestic manufacturer also unceasingly in the domestic insulation ball on the quality of the pneumatic valve, sealing reliability strives for perfection, strive to replace imported pneumatic valve insulation ball. In this paper, aiming at pneumatic valve in high temperature resistant insulation ball problem is analyzed and improvement measures are put forward. Questions are

existing technology in the field of thermal insulation ball pneumatic valve, pneumatic valve, also known as jacket ball is on the basis of the pneumatic ball valve welding metal jacket, jacket and pneumatic valve body between thermal channel, channel and injecting steam or other heat medium, ensure media works in the pneumatic valve. Insulation pneumatic ball valve with good insulation properties, and pneumatic valve and pipe diameter, and can effectively reduce medium heat loss in pipeline. Is mainly used in petroleum, chemical, metallurgical, pharmaceutical, food and other kinds of systems, in order to transport under normal temperature solidification of high viscosity medium.
by pneumatic valve seal structure and its corresponding sealing material, the use of less than ℃ temperature. And for a long time in ℃ under the condition of use, live shorter lives. Although pneumatic valve seat can choose short time ability ℃ high strength graphite material, but the part of the pneumatic valve has a lot of need to seal the still can't seal in high temperature situation, especially in the radial sealing, high strength graphite materials not suitable for radial seal. Common radial sealing insulation ball pneumatic valve is USES the o-ring seal structure, such use of the pneumatic valve temperature directly restricted by o-ring used temperature, the insulation on the pneumatic valve ball today is fluorine rubber o-ring, and the use of fluorine rubber temperature within the ℃, and cannot be used within the limit temperature for a long time. Far cannot satisfy the requirement of market in many media, such as the working medium of rosin, the required insulation ball pneumatic valve used for ℃ temperature, such ability is helpful for medium to obtain ideal liquid rosin, using o-ring as traditional sealing parts, will not be able to meet their requirements.

improvement measures according to the thermal insulation problems existing in the pneumatic valve, pneumatic valve determine the insulation ball sealing material and the structure was improved.
( ） In a sealed cavity with high temperature resistant material of flexible graphite seal ring, at the back of the sealing ring with a taper section of the gasket, washer fitted behind the special structure of the screw, so by tightening the plug, plug will be passed to the gasket, washer cone section will squeeze the sealing ring, sealing ring deformation, tiejin, both inside and outside the radial bearing ring and pneumatic valve body, so that insulation ball pneumatic valve in the radial sealing structure of high temperature resistant, at the same time, by tightening the screw, produce pre tight seal between the sphere and the pneumatic valve seat, make its seal.

( ） On the pneumatic valve seat seal structure also makes the corresponding improvement, the insert structure, the pneumatic valve body and supporting ring grooves dug up, groove bottom in sealed superior performance and high temperature resistance of the flexible graphite, which can play a role of pneumatic seal at the bottom of the seat, and can play between the sealing deputy for heat bilges cold shrink compensation effect. In flexible graphite is mounted on the high temperature resistant metal pneumatic valve seat, using temperature can be used to ℃ within a long period of time, so as to solve the thermal insulation ball pneumatic valve cannot be used in ℃ or more long time. And it also could be selected according to the requirement of the actual working condition of different material pneumatic valve seat.
( ） Drainage effect in the picture at the bottom of the pipe with plug is threaded connection, when the temperature rises, the threaded portion of seal is hard to guarantee, decided to cancel the plug, plug, which is connected with the bottom to take over in the picture changed into terraced drain plug and end connection with winding gasket seal, to ensure that at the bottom of the sealing reliability.
in the
by improving insulation ball sealing structure of the pneumatic valve, sealed performance is good, especially the improved flexible graphite instead of o-ring, is widely used on the working condition of temperature ℃ or less. With the development of domestic industrial level and technological progress, its performance will continue to improve, application scope will continue to expand. Insulation pneumatic ball valve is according to the market demand and improve the design and manufacture, the pneumatic valve has a compact structure, convenient operation, reliable sealing and long service life etc, at present in the insulation ball pneumatic valve user running in good working condition, various performance indexes meet the design requirements. For easy setting, high viscosity liquid medium with excellent performance, especially suitable for thick mass media such as rosin.

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