Valve apparatus

• US 20070034819A1
• Filed: 07/20/2006
• Published: 02/15/2007
• Est. Priority Date: 07/28/2005
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Murakami, Fumiaki, Mitsumata, Naoki
• Granted Patent: US 7,441,546 B2
• Time in Patent Office: Days
• US Class Current: 251/129.140
• CPC Class Codes: F02M 63/0015 electrical, e.g. using solenoid
• CPC Class Codes: F02M 63/0052 with means for adjusting the opening pressure, e.g. electrically controlled
• CPC Class Codes: F02M 63/0071 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
• CPC Class Codes: F02M 63/025 from the common rail
• CPC Class Codes: F16K 31/0665 with valve member being at least partially ball-shaped F16K31/0662 takes precedence

Abstract

A pushrod is slidably received in a slidably holding guide, which is formed separately from a valve body of a valve apparatus. A clearance is provided between an inner peripheral surface of a small diameter tube portion of the valve body and an outer peripheral surface of the guide. The clearance is provided to absorb deformation of the small diameter tube portion.

Claims

1. A valve apparatus comprising:

a valve body;

a slidable member that is slidably supported in the valve body;

a drive means for applying a drive force to the slidable member to move the slidable member in a sliding direction and thereby to open and close a flow passage or to adjust a flow quantity of fluid passing the flow passage; and

a slidably holding guide that is formed separately from the valve body and has a slide surface, which slidably supports the slidable member, wherein the slidably holding guide is positioned such that a clearance is formed between the slidably holding guide and the valve body.

2. The valve apparatus according to claim 1, wherein:

the valve body includes a tubular portion, which includes a fixing portion that is formed in an outer peripheral surface of the tubular portion and is fixed to an external fixing member; and

the clearance is positioned radially inward of the fixing portion.

3. The valve apparatus according to claim 1, wherein:

the slidably holding guide is shaped into a tubular body, which has an inner peripheral surface that forms the slide surface to slidably support the slidable member; and

the clearance is positioned radially outward of the slide surface of the slidably holding guide.

4. The valve apparatus according to claim 1, wherein the valve apparatus is a pressure reducing valve, which is fixed to a common rail that accumulates high pressure fuel in a common rail fuel injection system such that the pressure reducing valve relieves an actual rail pressure of the common rail.

5. The valve apparatus according to claim 1, wherein the clearance is an annular clearance and is located between an outer peripheral surface of the slidably holding guide and an inner peripheral surface of the valve body and has a larger radial size in comparison to a slide clearance, which is formed between an outer peripheral surface of the slidable member and the slide surface of the slidably holding guide and is positioned radially inward of the annular clearance.

6. A valve apparatus comprising:

a valve body;

a slidable member that is axially slidably supported in the valve body;

a drive means for applying an axial drive force to the slidable member;

a valve element that is provided at a distal end of the slidable member and receives the axial drive force of the slidable member;

a seat member that has a valve seat against which the valve element is seatable, wherein when the valve element is lifted away from the valve seat, a flow passage hole formed in the valve seat is opened; and

a slidably holding guide that is formed separately from the valve body and has a slide hole that slidably supports the slidable member, wherein the seat member is fitted to an inner peripheral surface of the slidably holding guide in such a manner that a central axis of the seat member generally coincides with a central axis of the slidably holding guide.

7. The valve apparatus according to claim 6, wherein the slidably holding guide is fitted to an inner peripheral surface of the valve body in such a manner that the central axis of the slidably holding guide generally coincides with a central axis of the valve body.

8. The valve apparatus according to claim 6, wherein the valve apparatus is a pressure reducing valve, which is fixed to a common rail that accumulates high pressure fuel in a common rail fuel injection system such that the pressure reducing valve relieves an actual rail pressure of the common rail.

9. A valve apparatus comprising:

a valve body;

a slidable member that is axially slidably supported in the valve body;

a drive means for applying an axial drive force to the slidable member;

a valve element that is provided at a distal end of the slidable member and receives the axial drive force of the slidable member;

a seat member that has a valve seat against which the valve element is seatable, wherein when the valve element is lifted away from the valve seat, a flow passage hole formed in the valve seat is opened; and

a slidably holding guide that is formed separately from the valve body and has a slide hole that slidably supports the slidable member, wherein the seat member is formed integrally with the slidably holding guide in such a manner that a central axis of the seat member generally coincides with a central axis of the slidably holding guide.

10. The valve apparatus according to claim 9, wherein the slidably holding guide is fitted to an inner peripheral surface of the valve body in such a manner that the central axis of the slidably holding guide generally coincides with a central axis of the valve body.

11. The valve apparatus according to claim 9, wherein the valve apparatus is a pressure reducing valve, which is fixed to a common rail that accumulates high pressure fuel in a common rail fuel injection system such that the pressure reducing valve relieves an actual rail pressure of the common rail.

12. A valve apparatus comprising:

a valve body;

a slidable member that is axially slidably supported in the valve body;

a drive means for applying an axial drive force to the slidable member;

a valve element that is provided at a distal end of the slidable member and receives the axial drive force of the slidable member;

a seat member that has a valve seat against which the valve element is seatable, wherein when the valve element is lifted away from the valve seat, a flow passage hole formed in the valve seat is opened; and

a slidably holding guide that is formed separately from the valve body and has a slide hole that slidably supports the slidable member, wherein the slidably holding guide is fitted to an inner peripheral surface of the valve body in such a manner that a central axis of the slidably holding guide generally coincides with a central axis of the valve body.

13. The valve apparatus according to claim 12, wherein the valve apparatus is a pressure reducing valve, which is fixed to a common rail that accumulates high pressure fuel in a common rail fuel injection system such that the pressure reducing valve relieves an actual rail pressure of the common rail.