VALVE

Abstract

A valve includes a valve housing provided with an inlet port and an outlet port a valve body to be driven by a drive source a spring that urges the valve bodyin a direction opposite a direction of driving by the drive source and a valve seat formed at an edge of a through-flow passage The valve body and the valve seat cooperatively form a poppet valve. The valve is configured to control a flow rate in accordance with a movement of the valve body Flow passages on a downstream side of the poppet valve are provided with increase regions where a flow passage cross-sectional area tends to increase toward the downstream side.

Description

Claims

1. A valve, comprising: a valve housing provided with an inlet port and an outlet port;a valve body configured to be driven by a drive source;a spring configured to urge the valve body in a direction opposite a direction of driving by the drive source; anda valve seat formed at an edge of a through-flow passage the valve body and the valve seat cooperatively forming a poppet valve, the valve being configured to control a flow rate in accordance with a movement of the valve body,wherein a flow passage on a downstream side of the poppet valve is provided with an increase region where a flow passage cross-sectional area tends to increase toward the downstream side.

2. The valve according to claim 1, wherein the flow passage cross-sectional area of the increase region continuously increases.

3. The valve according to claim 1, wherein the valve seat has a tilted shape in a cross-sectional view and the valve body has a curved shape in a cross-sectional view.

4. The valve according to claim 3, wherein the tilted shape is a linear shape.

5. The valve according to claim 3, wherein a tilted surface forming the valve seat is continuous with an opening of the outlet port.

6. The valve according to claim 1, wherein the valve seat is formed in a valve seat member that is separate from the valve housing.

7. The valve according to claim 2, wherein the valve sear has a tilted shape in a cross-sectional view and the valve body has a curved shape in a cross-sectional view.

8. The valve according to claim 7, wherein the tilted shape is a linear shape.

9. The valve according to claim 4, wherein a tilted surface forming the valve seat is continuous with an opening of the outlet port.

10. The valve according to claim 2, wherein the valve seat is formed in a valve seat member that is separate from the valve housing.

11. The valve according to claim 3, wherein the valve seat is formed in a valve seat member that is separate from the valve housing.

12. The valve according to claim 4, wherein the valve seat is formed in a valve seat member that is seperate from the valve housing.

13. The valve according to claim 5, wherein the valve seat is formed in a valve seat member that is separate from the valve housing.