Flow rate control valve

Details Flow rate control valve Flow rate control valve

2001-12-10

2003-12-23

Hirsch, Paul J. (Department: 3754)

Valves and valve actuation

Electrically actuated valve

Remote or follow-up control system for electrical actuator

C251S129150

Reexamination Certificate

active

06666429

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flow rate control valve which can control the flow rate of a fluid. In particular, the present invention relates to a flow rate control valve of a proportional type using a solenoid.
2. Description of the Related Art
A flow rate control valve has been conventionally used to control the flow rate of a fluid flowing through a passage by changing the passage area in the valve if a pressure fluid is supplied to or discharged from an actuator.
According to a conventional flow rate control valve
1
shown in
FIG. 3
, a fluid passage
8
is generally opened and closed by manually operating a handle section
2
to enable a valve rod
4
to advance and retreat in an axial direction of the flow rate control valve
1
. The handle section
2
is disposed upwardly of a body
3
.
In the above case, a tapered tip end
9
of the valve rod
4
held by a seal
5
faces the fluid passage
8
defined between a fluid supply port
6
and a fluid discharge port
7
. The flow rate of the fluid flowing from the fluid supply port
6
to the fluid discharge port
7
is controlled by the inserted degree of the tip end
9
into the fluid passage
8
.
In the above conventional flow rate control valve
1
, the manual operation enables the tip end
9
(valve plug) of the valve rod
4
to advance and retreat. However, the valve opening degree cannot be constantly controlled to a desired value since the above advancing and retreating movement is performed depending upon the operator's manual operation.
Further, the operator's manual operation cannot keep the fluid passage
8
and the valve plug airtight and liquid-tight with the valve plug being completely closed.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a flow rate control valve which can set an arbitrary flow rate by electrically controlling the opening and closing operation of a valve plug and which can control the flow rate of a fluid highly accurately.


REFERENCES:
patent: 3801063 (1974-04-01), Holmes et al.
patent: 5441233 (1995-08-01), Asou et al.
patent: 5657962 (1997-08-01), Neron et al.
patent: 5741002 (1998-04-01), Breyer
patent: 5992822 (1999-11-01), Nakao et al.
patent: 6062824 (2000-05-01), Kimura et al.
patent: 6336621 (2002-01-01), Ii et al.
patent: 199 14 372 (2000-10-01), None
patent: 1 013 982 (2000-06-01), None

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