Phase equilibrium of PS gels having various density of a network has been studied in cyclohexane in the nonstrained state, in conditions of uniaxial stretching and omnidirectional compression. The pulsizing mechanism of phase separation of gels is observed manifesting in the vibrational character of the rate of their turbidity and solvent squeezing out and in the nonmonotonous change of their geometrical dimensions and radii of light scattering particles.