INFLUENCE OF ELASTOMER GASKET DEFORMATION ON CHARACTERISTICS OF PISTON PUMPS

Developing a special piston rough vacuum pump for medical application, the realization of sealing between piston and cylinder wag was an ess ential problem. To this aim efforts were made in searching for the mos t adequate gasket shape and material. In the case of O-type elastomer ring the squeezing of the torus in the groove during functioning depen ds on piston and cylinder dimensions. Pressures appearing in the gaske t material influence the sealing quality and consequently the pumping speed. Pistons with different groove size for elastomer gasket were us ed in the experimental pump and their characteristics were compared.