Pneumatic valve sealing parsing (steel 3)

open-close part should be in place, when you start the pneumatic valve. Make the seal play their functions. But it's worth noting that the force should be light and moderate, shoulds not be too fast, in order to avoid scratch sealing surface, prolong the cycle of pneumatic valve seal, put an end to the harm of pneumatic valve leakage. Practice has proved that in the plane of the pneumatic valve seal using compared with taper sealing form, design way of mechanical processing equipment and process equipment requirements are relatively low, whether it is a small job or batch production, can achieve reduce the production capital, improve the work efficiency, to stabilize the product quality and ensure the peace of supporting facilities operation has a positive meaning.
save energy, in order to achieve zero leakage of pneumatic valve inside and outside the seal. Maintenance environment and improve the work efficiency, pneumatic valve must have reliable sealing performance. Pneumatic valve sealing parts mainly include the opening and closing of the contact between the two sealing surface with the pneumatic valve seat, pneumatic valve rod contacts and pneumatic valve cover, pneumatic valve stem seal, pneumatic valve body and valve cover gasket between the contact point, etc. Among them, the open-close part with two pneumatic valve seat sealing surface leakage between called pneumatic valve leakage, and pneumatic valve stem and pneumatic valve cover, pneumatic valve stem seal and pneumatic valve body and bonnet leakage between the sealing surface is called pneumatic valve leakage. Pneumatic valve pneumatic valve leak will affect ability to cutting medium. Pneumatic valve leakage will cause the medium loss or environmental pollution, serious when still can cause major accidents. For flammable and explosive, toxic or radioactive medium, pneumatic valve leakage phenomenon is not allowed to happen

national specification for steel gate globe pneumatic valve pneumatic valve and steel sealing technology requirements formulated the relevant regulations. Steel gate of pneumatic valve and globe valve seal sealing effect and pneumatic valve material, equipment, tooling manufacture, heat treatment, machining process, tolerance and associated parts machining precision, and other links, pneumatic valve seal sealing performance is an important technical index to measure the quality of pneumatic valve. One can not meet the design requirements of the technology is directly will affect the sealing effect ( Pneumatic valve seal as shown on the site according to the provisions of the relevant specification, pneumatic valve sealing should have conical or spherical sealing structure. However, conical or spherical sealing structure is relatively flat seal structure has certain advantages, such as sealing surface friction phenomenon, maintenance difficulties, high processing difficulty, increase the production of capital. As a result, interest rates rise, products less competitive. At the same time, the pneumatic valve sealing performance and it is hard to reach specification of technical requirements, often several times after sealing performance test on the seal failure.

as is adopted in the design of the pneumatic valve seal pneumatic valve pneumatic disc plane sealing principle, in view of the conical and spherical sealing face problems and according to the actual working condition of pneumatic valve performance analysis. The pneumatic valve rod and pneumatic valve cover originally by the conical sealing surface improved to plane contact mode. Pneumatic valve stem plane contact with pneumatic valve cover seal generally are not subject to any equipment, precision tooling, matching parts shape and position tolerances of precision, simple structure, easy processing, pneumatic valve cover sealing parts just fine car after surfacing can meet the design requirements. Pneumatic valve stem after finishing, pneumatic valve stem head heating and quenching temperature, air cooling to room temperature, after finish turning sealing plane can be assembled. The qualified rate of pneumatic valve seal test can achieve %, its service life also can achieve the same as the number of pneumatic valve opening and closing, and maintenance rise more convenient also.

both compression after contact adhesive, stainless steel pneumatic valve with pneumatic valve stem and valve cover austenitic material information generally all is the same. Pneumatic valve cover as far as possible do not use seal on the form of cone. Can work out at the bottom of the pneumatic valve cover packing hole sealing hole, using pneumatic valve stem cone and ptfe cone gasket as a seal, this structure is very suitable for application on the road at the pipe of corrosive medium.