Abstract: The method of the invention defines the steps to be practiced in loosening tightly-joined elements, i.e., loosening a rotor which has been shrunk onto a shaft, for example, in order that the relative positionings of such rotor and shaft may be altered. With the one element having a bore tightly fitted about the surface of the other element, the method teaches the introduction of fluid under pressure between the bore and the surface, whereby the latter is sufficiently expanded to accomplish the loosening. The invention further sets forth tightly-joined elements especially configured to enable a practice of the method. Hence, one of the elements has a conduit formed therein for introducing fluid under pressure to the interface formed by the surfaces of the elements which are in fast engagement.

Abstract: The invention comprises a novel oil distributing arrangement, employing a valve which has a plurality of responses, for use in a gas compressing system or the like. The valve has a plurality of ports for admitting oil thereinto from an oil pump via a cooler, and for discharging oil therefrom, to a gas compressor (or some such similar oil-using end item) or for by-passing oil directly back to the oil pump (or a pump-serving oil reservoir), or for by-passing the cooler, etc. A translating valving element opens and closes communication between different oil admittance and oil discharge ports in the valve, in response to discrete ranges of valve-operating fluid pressures addressed to the valving element, to effect the cited by-passing functions, and to maintain a fairly uniform pump output pressure level.