Patent ID: 8205638
Filing Date: 2012-06-26
Classification: G05D,Y10T

Abstract:
1. A fluid pressure regulator with a no-drain valve, comprising: a housing assembly formed at its one end with a flow inlet and on its other end with a flow outlet and a flow passage connecting between them and includes a flow control opening formed at said flow inlet and a passage space; and a cylinder assembly mounted within said passage space wherein its one end is formed with a passing thru-hole opening, located opposite said flow control opening and adjacent to it, and its opposite end is open and is located to face said flow outlet opening; and a sealing assembly installed at one end of said cylinder assembly that is formed, as said cylinder assembly, with said passing thru-hole opening; and said cylinder assembly having an inner space is formed with at least one radial rib around its circumference, that mounts said cylinder assembly within said passage space, so that fluid flow passage is enabled from said flow control opening into said flow outlet through a gap existing on a surface of said rib; and the inner space of said cylinder assembly is ventilated to the environmental atmosphere; and a movable piston assembly located within said cylinder assembly and is moveable within said cylinder assembly and through said passing thru-hole opening that is formed at one end of said cylinder assembly; and said piston assembly is formed with a rod component wherein one end of said rod component carries a valve component, and whereas said rod component has a small cross section relative to the cross section of said valve component, and said rod component is movable through said passing thru-hole opening formed at one end of said cylinder assembly and through said sealing assembly; and said rod component that carries said valve component at its one end, is movable by the motion of said piston assembly towards said flow control opening formed at said housing assembly and away from it, in order to control the flow through it and towards said flow outlet from said housing assembly; and wherein at a fully open state of said valve component, said valve component connects to form a contact with said sealing assembly; and a springy means located within the inner space of said cylinder assembly and stresses said piston component into said fully open state of said valve component; wherein said regulator is characterized in that: said rod component carries at its other end a bushing component formed with a bracket and with a protruding shoulder around its circumference wherein on its one side, said shoulder connects with said springy means that stresses said piston assembly into said fully open state of said valve component; and said flow outlet includes an exit flow control opening; and said regulator includes a no-drain valve that comprises: a no-drain spring means whose one end is located on said bracket formed at said bushing component; and a no-drain piston assembly, movable upon said bushing component, within said cylinder assembly and through said opposite open end of said cylinder assembly, into said exit flow control opening and from it; when said no-drain piston assembly is formed on its one side, with a bracket and on its second side, with a no-drain valve component and a protruding shoulder around its circumference that has a relatively large surface area in comparison to said rod's cross section; and wherein a second end of said no-drain spring means is located upon said bracket that is formed in said no drain piston assembly and stresses said no-drain valve component towards said exit flow control opening, to a fully closed state of said no-drain valve component; an upper sealing assembly installed between said inner space of said cylinder assembly to said no-drain piston, in order to seal said inner space of said cylinder assembly; so that: when said fluid pressure decreases at said flow inlet to a settable in advance level, said no-drain spring means overcomes the force exerted by the fluid pressure upon said no-drain valve component and said protruding shoulder formed around its circumference, pushing said no-drain piston assembly and stresses said no-drain valve component towards said exit flow control opening to said fully closed state of said no-drain valve component; and upon an ongoing increase of said fluid pressure at said flow inlet to a settable in advance level that is lower than a designed regulated pressure of said regulator or at most equal to said designed regulated pressure of said regulator, the force that exerts said fluid pressure on said protruding shoulder surface area formed around said circumference of said no-drain valve component overcomes said no-drain spring means and propels said no-drain piston assembly and with it said no-drain valve component, upon said bushing component within said cylinder assembly and through its second, open opposite end of said cylinder assembly while opening said exit flow control opening to fluid passage from said flow inlet to said flow outlet; and with a further increase of said fluid pressure at said flow inlet to a level higher than said designed regulated pressure of said regulator, said no-drain piston assembly drives said bushing component carried upon said rod component to move together—said no-drain piston assembly and said piston assembly; wherein the force exerted by said fluid pressure on said surface area of said no-drain valve component and said protruding shoulder around its circumference overcomes said spring means, said no-drain spring means and the force exerted by said fluid pressure on said surface area of said valve component that is carried by said rod component; and said force drives said valve component carried upon one end of said rod component, towards said flow control opening formed in said housing assembly, in order to control said flow through it towards said flow outlet from said housing assembly.