Fluid handling – Systems – Multi-way valve unit
Patent
1998-03-25
2000-02-08
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
2511291, F15B 13044
Patent
active
060218134
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetically actuatable directional valve.
Such valves are known from RD 29 060 of April 1993 of Mannesmann Rexroth. In order to obtain good automatic control of these valves, their valve chambers including the armature chambers of the actuating magnets which are in communication with each other via a channel extending within the valve housing must be vented. For this purpose, air-removal channels which can be closed by screws are present on the outer closure covers of the magnet housing. Upon the placing in operation, the closure screws are removed and working fluid introduced through the air-vent channel of the one actuating magnet until fluid emerges from the air-vent channel of the opposite actuating magnet. The air-vent channels are then closed by means of the closure screws.
SUMMARY OF THE INVENTION
The object of the invention is to create an electromagnetically actuated directional valve in connection with which the known cumbersome removal of air from the armature chambers of the actuating magnets can be dispensed with.
In accordance with the invention, the armature chambers are in communication via an inlet throttle (16, 17) with the connection (P) of the source of working fluid and, via an outlet throttle (7, 27, 8, 28), with the tank connection (T).
Due to the fact that the armature chambers are in communication with the source of working fluid via an inlet throttle and with the tank connection via an outlet throttle, the working fluid entering into the armature chambers is under a pressure the value of which is between the pump pressure and the tank pressure. The air present in the armature chambers is compressed by this pressure so that the armature chambers are substantially filled by the incoming working fluid so that dependable control of the valve is assured.
With the above and other objects and advantages in view, the present invention will become more clearly understood in connection with the detailed description of the preferred embodiment, when considered with the accompanying drawings of which:
In the drawing:
FIG. 1 is an axial section through a four-way proportional valve having two actuating magnets and integrated control electronics;
FIG. 2 is a longitudinal section through the valve housing in the plane of the housing channel with the threaded section with screw forming the throttle;
FIG. 3 is a section along the line III--III of FIG. 2; and
FIG. 4 is a partial longitudinal section through the proportional valve with throttle integrated in the control piston.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, the valve housing is designated 1 and the control piston 2. The control piston 2 is displaced by the actuating magnets 3 and 4 fastened on both sides of the valve housing in one or the other direction, depending upon the signal given by the control electronics 6 placed on the actuating magnets 3. The control piston 2 has, on its ends, piston sections 7 and 8 which separate the housing recesses 9, 10 in communication with the armature chambers (not shown) of the actuating magnets from the control chambers 12, 13 of the valve housing 1 which are in communication with the tank from each other. From the control chamber 15 of the valve housing which is in communication with the working-fluid connection P, a housing-channel section provided with a female thread 16 and closed by a screw 17 leads to a housing-channel section 20 extending parallel to the actuating axis 19 of the control piston, from the ends of which housing channel sections 21, 22 extending from the ends of the housing channel section 20 close to the fastening walls 23, 24 for the actuating magnets 3 and 4 lead to the housing recesses 9, 10.
If, upon the placing in operation of a hydraulic system, the control chamber 15 which is in communication with the source of working fluid via the pressurized-fluid connection P is acted on by the working or pressurized fluid, then a small amount of working fluid flows via the flank
REFERENCES:
patent: 4406307 (1983-09-01), Loup et al.
patent: 4821773 (1989-04-01), Herion et al.
patent: 5605178 (1997-02-01), Jennins
patent: 5785087 (1998-07-01), Takahashi et al.
Mannesman Rexroth: "4/2-Und 4/3-Proportional- . . . " Apr. 1993 Typenblatt RD 29060, pp. 1-12 XP000610475.
Imhof Rainer
Siegler Manfred
Farber Martin A.
Mannesmann Rexroth AG
Michalsky Gerald A.
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