FLUID PRESSURE REGULATOR WITH NO-DRAIN VALVE

A fluid pressure regulator with a no-drain valve, characterized in that-when the fluid pressure decreases at the regulator's flow inlet to pre-set level, a no-drain spring means of the regulator, overcomes the force exerted by the fluid pressure upon the regulator's no-drain valve component and a protruding shoulder formed around its circumference, pushing a no-drain piston assembly of the regulator and stresses its no-drain valve component towards an exit flow control opening formed in the regulator, to the fully closed state of the regulator's no-drain valve component; and upon an ongoing increase of the fluid pressure at the flow inlet to a pre-set level that is still lower than the designed regulated pressure of the regulator or at most equal to the designed regulated pressure of the regulator, the force that the fluid pressure exerts on the protruding shoulder surface area formed around the circumference of the regulator's no-drain valve component, overcomes a no-drain spring means and propels the regulator's no-drain piston assembly and with it, the no-drain valve component, upon a bushing component within a cylinder assembly and through its second, open opposite end of that cylinder assembly, while opening an exit flow control opening to fluid passage from the flow inlet of the regulator to its flow outlet; and with a further increase of the fluid pressure at the flow inlet to a level higher than the designed regulated pressure of the regulator, and in order to control the flow through the regulator towards the flow outlet from its housing assembly, the regulator's no-drain piston assembly drives a bushing component carried upon a rod component to move together-the regulator's no-drain piston assembly and its piston assembly, towards a flow control opening formed in the regulator's housing assembly.