Back to results
US 2003/0196697 A1Published application
Relief valve
AssigneeKayaba Industry Co., Ltd.
InventorsMaoying Guo, Hideki Tsuchiya, Kiyokazu Nagata
Life of this patent
Estimating the term…
Abstract
A gap 11 between a flange 4A of a ball support member 4 and the inner circumferential surface of a sleeve member 7 functions as an orifice for restricting an oil flow downstream of a seat hole (6B). The movement of the ball support member 4 is stabilized, pressure is generated in a chamber 9 downstream of a seat hole 6B, and the override characteristics of the relief valve 1 are improved.
Claims17
A relief valve, comprising:
- a valve seat comprising a seat hole;
- a ball which opens and closes the seat hole from the downstream side;
- a movable member which supports the ball from the downstream side;
- a housing part which houses the movable member;
- and
- an orifice formed downstream of the seat hole which damps the vibration of the movable member and suppresses chattering by restricting an oil flow.
3 more elements
A flowrate control valve which controls the flowrate supplied from a pump to a load circuit comprising a relief valve, the relief valve comprising:
- a valve seat having a seat hole;
- a ball which opens and closes the seat hole from the downstream side;
- a movable member which supports the ball from the downstream side;
- a housing part which houses the movable member;
- and
- an orifice formed downstream of the seat hole which damps the vibration of the movable member 4 and suppresses chattering by restricting an oil flow, wherein:
- the relief valve opens when the pressure on the load circuit side rises, and part of the fluid from the pump is discharged to a tank port.
4 more elements
Dependencies are inferred from the claim text.