A gas regulator has a pressure control diaphragm biased by a spring. The force of the spring upon the diaphragm, and thus the operating pressure for the regulator, is controlled by a linear travel bushing bearing against the spring. The bushing is preferably threaded upon a shaft, the rotation of which allows travel of the bushing. The top end of the shaft is recessed within a bore in the regulator housing to deter tampering. The shaft may be locked in position by use of a recessed setscrew, while the access bore may be provided with a cover.
A flow regulator for a water pump, working in conjunction with a water pump, having a pump, an inlet pipe, an outlet pipe with a water pressure, and a container. The flow regulator comprises: a main body, installed at the inlet pipe and having a passageway for water flowing through the inlet pipe; a chamber inside the main body; an entrance on the main body, conducting the water pressure in the outlet pipe to the chamber; a control element, mounted inside the chamber and glidingly movable therein back and forth; a spring; and an adjustable cover, mounted on the main body and connected to the spring. The water pressure causes the control element to move within the chamber, resulting in the passageway to be narrowed. The spring counters the water pressure, such that when the water pressure decreases the passageway is widened. By varying the position of the adjustable cover, the elastic force of the spring is adjusted.
