Analysis of five pilot operated safety pneumatic valve pneumatic valve body joint leakage

the guide type safety pneumatic valve by the main pneumatic valve, pneumatic valve, pneumatic valve, discharge joints and catheter, etc, is a kind of rely on from a pneumatic valve guide medium to drive or control the main security pneumatic valve pneumatic valve. Pilot operated safety pneumatic valve is one of the important accessories, boiler common application is installed on high pressure power station boiler. Pilot operated safety pneumatic valve before installation on the device, pneumatic valve must check safety sign setting pressure whether meet the system requirements, whether through validation and seal are in good condition. Pilot operated safety pneumatic valve must be installed vertically on the equipment or pipeline. Pilot operated safety pneumatic valve internal quality request is higher, often due to internal factors such as material, sealing surface, bolt pre-tightening force, will cause the guide type safety pneumatic valve installed on the device, pneumatic valve body found in combination with surface will have leakage phenomenon. Its security pneumatic valve technical personnel on the leakage of the subject, the following to analyze three major causes and improving measures.
a bad joint surface flatness, pneumatic valve body or be hard impurities pad seal failure. Joint surface flatness of the pneumatic valve body is caused by the pneumatic valve body combined with the surface of the leakage, to eliminate the method is to combine safety disintegration of pneumatic valve to grinding surface until it meets quality standards. Caused by impurities mat live seal failure, serious when safety pneumatic valve assembly clean surface to avoid impurities fall into.
2, pneumatic valve body combined with the tooth gasket is not in conformity with the standards. For example, tooth-type gasket radial slightly trench, parallelism is poor, defects such as tooth tip or a slope would cause the seal failure. Which will make the combination pneumatic valve body surface leakage. Good during the maintenance spare parts quality, adopt standard tooth gasket can avoid the occurrence of this phenomenon.
3, combined with the bolt force is not enough or partial closely, combining face seal is not good. Elimination method is to adjust the bolt tightening force, when the bolt must hold tight the diagonal manner, it is best to tight while measuring clearance, everywhere to bolt tight tight so far, and make the joint gap is consistent throughout.
more about pilot operated safety knowledge of pneumatic valve, please browse its security pneumatic valve factory's official website http://www. 中国- - - - - - 安全- 阀门。 com