Fuel pressure regulation valve
AssigneeDenso Corporation
InventorAkihiro Kuroda
Life of this patent
Estimating the term…
Abstract
A regulation valve has: a cylinder that has an inlet port at one end side thereof to introduce the fuel thereinto, and a relief port opening on a side face thereof; a piston that is reciprocatably inserted in the cylinder to vary an opening area of the relief port in accordance with a variation of the pressure of the fuel flowing in through the inlet port; and a spring that urges the piston in a direction against the pressure of the fuel acting on the piston to regulate the pressure to be a specific value. Further, the cylinder and/or the piston is formed so that the piston opens the relief port at a relatively small speed per a unit displacement thereof in starting opening the relief port and subsequently at a relatively large speed.
Claims14
A regulation valve to regulate a pressure of a fuel comprising:
- a cylinder that has an inlet port at one end side thereof to introduce the fuel thereinto, and a relief port opening on a side face thereof;
- a piston that is reciprocatably inserted in the cylinder to vary an opening area of the relief port in accordance with a variation of the pressure of the fuel flowing in through the inlet port;
- and
- an urging means that urges the piston in a direction against the pressure of the fuel acting on the piston to regulate the pressure to be a specific value,
- wherein at least one of the cylinder and the piston is formed so that the piston opens the relief port at a first speed per a unit displacement thereof at a first stage to start opening the relief port and at a second speed larger than the first speed at a second stage subsequent to the first stage.
Dependencies are inferred from the claim text.