Patent ID: 8967195
Filing Date: 2015-03-03
Classification: F16K,Y10T

Abstract:
1. A pressure relief valve, comprising: a housing including an inlet chamber adapted to be in communication with an outlet of a pump and an outlet chamber adapted to be in communication with a pump inlet, the housing including a bore having a first end in communication with the inlet chamber, a plurality of orifices in communication with the outlet chamber, and a main spill aperture axially spaced apart from the plurality of orifices and in communication with the outlet chamber; a piston axially moveable within the bore between a first position whereat the piston seals the inlet chamber from the outlet chamber, a second position whereat the inlet and outlet chambers are in fluid communication with one another via only the plurality of orifices, and a third position whereat the inlet and outlet chambers are in fluid communication with one another via the plurality of orifices and the main spill aperture; and a spring biasing the piston toward the first position; where in each orifice of the plurality of orifices is axially spaced apart from adjacent orifices of the plurality of orifices, and wherein at least one of the plurality of orifices having a diameter being different from a diameter of the other orifices of the plurality of orifices.