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Abstract:

Constructional elements of slide bearings (particularly mechanical face seals) require usage of proper materials and proper selection of parameters of work, which assure tightness of the contact at the given rotational speed and the given pressure of the process liquid. The spectrum of the parameters of work, at which the sealing works properly, is restrained – for example – by the values of the unit pressures corresponding to the lower and upper border state [1, 2, 3, 4].
Determination of the characteristics of the border states has been described in the paper [5]. Experiments are carried out with appropriate measurement equipment, which emulates working conditions of the face seal.
The tests described in this contribution has been carried out on the stand SUM-1 [4, 6], which is able to measure moments of friction, unit pressures between the rings, temperature of non-rotating sliding ring at the sealing surface, working pressure of the process liquid, and smoothly adjusted rotational speed of the shaft. Therefore, the stand allows to carry out research in the scope of selection of appropriate materials designed for sliding mechanical seals.

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Tests of PTFE composites for sealing rings of contacting face seals