| Abstract: | A universal procedure for controlling the sylphon hermeticity is discussed. Travelling sylphon or membrane diaphragms in combination with a dublicate sylphon are used as a separating element at the border of the separating media, e. g. the medium transporting through the valve and the environmental air. Pneumatic pressure higher than the working pressure of the separating medium is created inside the space between the working and the dublicate sylphons. If the hermeticity of one of the above sylphons is broken, the excessive pressure inside the space between them is reduced which is automatically stated by means of a pneumatic probe. Because of detection of the breach in the hermeticity of one of the sylphons in proper time, when the second sylphon is safe, the contact of the transporting medium with the environmental air is prevented. The described procedure for controlling the hermeticity is universal since it provides the use of the probes working only under the pressure independent of the type and physico-chemical properties of the separating medium. One of the important advantages of the new procedure is also the fact that the working sylphon appears to be empty since the outer with respect to it pressure of the separating medium is practically balanced by the pressure created in the sylphon space. |
