Pressure limiting valve
AssigneeDanfoss A/S
InventorHarry E. Pedersen
Life of this patent
Estimating the term…
Abstract
A pressure limiting valve including a body having an inlet and an outlet coaxially arranged at opposite ends of the body. A discharge passage is disposed in the body between the inlet and outlet. A cylindrical valve element is spring biased to a position to prevent communication between the inlet or outlet and the discharge passage. The valve element includes areas at opposite ends with one area being larger than the other so that pressure in the inlet and outlet act on the valve in a direction opposite the spring bias so as to open the inlet and outlet to the discharge passage upon a predetermined increase in pressure.
Claims17
A pressure limiting valve, comprising a housing having wall means defining an interior chamber, an inlet aperture opening to said chamber, an outlet aperture opening to said chamber in axial spaced relationship to the opening of the inlet aperture to the chamber and a discharge passage opening to the chamber axially between the opening of the inlet and outlet apertures to the chamber, a valve element movable in one direction within the chamber from a first position blocking fluid communication between both of said apertures and the discharge passage to a second position permitting fluid communication between at least one of said apertures and the discharge passage, spring means acting between the valve element and the housing for resiliently retaining the valve element in its first position, the valve element having a pressure engaging first surface which with pressure applied thereagainst acts to move the valve element in the same direction that the spring means acts to move the valve element, and an oppositely disposed pressure engaging second surface that is larger than the pressure engaging first surface.
A pressure limiting valve operable as soon as a predetermined static pressure within the valve has been exceeded, comprising a housing having wall means defining an interior chamber, an inlet aperture opening to the chamber, a threaded outlet aperture opening to the chamber axially opposite and axially aligned with the opening of the inlet aperture to the chamber and a discharge passage opening to the chamber axially intermediate the opening of the inlet and outlet apertures to the chamber, a valve element mounted in the chamber for movement from a datum first position blocking fluid communication between the chamber and the discharge passage and a second position permitting fluid communication between the chamber and the discharge passage, an annular bushing threaded into the chamber and the discharge passage, and spring means including a spring portion acting against the bushing for resiliently urging the valve element to the valve element first position, the valve member having a bore extending axially therethrough and axially oppositely disposed first and second pressure engaging surfaces that respectively face the inlet aperture and the outlet aperture, the second pressure engaging surface being smaller than the first pressure engaging surface and the valve element bore being of a larger diameter than half of diameter of the inlet aperture.
Dependencies are inferred from the claim text.