Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1994-08-25
1996-10-15
Rivell, John
Fluid handling
Line condition change responsive valves
Direct response valves
137529, 137903, F16K 1504
Patent
active
055644686
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based upon a seat-style pressure-relief valve according to the generic type of the main claim. Known pressure-relief valves of this type are used where high requirements are placed upon low contamination-sensitivity, small regulating paths and short response times. Especially where the contamination-insensitivity requirements are high, i.e. where pressure-relief valves of this type are used in contaminated pressure-medium circuits, it is endeavoured to dispense with any tight guidance of the valve member. However, in known pressure-relief valves, this then leads to a tendency for their valve members to jam. Also the requirements of a good bearing contact of the valve member against the valve seat (seal-tightness) do not always, in this case, satisfy all demands.
ADVANTAGES OF THE INVENTION
The seat-style pressure-relief valve according to the invention, having the characterizing features of the main claim, has the advantage in contrast to the above that, despite low contamination-sensitivity, a good and secure bearing contact of the valve member against the valve seat is ensured. The pressure-relief valve according to the invention, moreover, displays no tendency to jam and is distinguished by a simple and compact construction.
Further advantages and advantageous refinements of the invention can be derived from the subclaims and the description.
DRAWING
Illustrative embodiments of the invention are explained in greater detail in the following description and drawing. The latter shows in FIG. 1, in section, a first illustrative embodiment of a pressure-relief valve according to the invention, which is inserted in a diagrammatically represented hydraulic regulating device.
FIG. 2 shows another embodiment of the invention.
FIG. 2A is a view showing a further embodiment of the present invention.
DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS
The pressure-relief valve 10 represented in FIG. 1 has an approximately pot-shaped housing 11, the base 12 of which is penetrated by a centric bore 13 and an eccentric bore 14. These bores open out into a recess 15 which, originating from the interior 16 of the housing 11, is sunk into the base 12.
The centric bore 13 is widened conically in the direction of the recess 15. This widening serves as a valve seat 17 and interacts with a valve member 18 which, in this illustrative example, is constructed as a ball.
Into the base 12 of the housing 11 there is further sunk an annular groove 19, which originates from the interior 16 and into which there is placed a sealing ring 20. The external diameter of the annular groove 19 corresponds to the diameter of the interior 16 and the said annular groove runs concentrically to the recess 15. Bearing with its rim upon the sealing ring 20 is a disc-shaped diaphragm 21, which also bears upon the valve member 18.
The housing 11 is closed off by a housing cover 22 and, at the same time, the diaphragm 21 is pressed against the sealing ring 20. For this purpose, the housing cover 22 is constructed approximately cylindrically and is screwed by an external thread 23 into a corresponding internal thread 24 of the housing 11.
Into that end side 25 of the housing cover 22 facing the base 12 there is sunk an approximately frusto-conical recess 26, the external diameter of which is somewhat greater than the internal diameter of the annular groove 19.
The centric bore 13 in the housing 11 is connected to a line 28 which branches off from a pressure line 29. Through this pressure line 29, pressure medium is delivered by a pump 30 into the annular chamber 31 of a differential cylinder 32.
The eccentric bore 14 is connected to a line 34 which branches off from a pressure line 35. This connects the larger pressure chamber 36 on the differential piston 37 of the differential cylinder 32 to the inlet 38 of an electromagnetically operated proportional pressure control valve 39, the outlet 40 of which is connected to a receptacle 41. The said proportional pressure control valve exhibits a valve member 42, which is loaded i
REFERENCES:
patent: 3079946 (1963-03-01), Rosler
patent: 3105507 (1963-10-01), Dunmire
patent: 3528342 (1970-09-01), Simcock
patent: 3807430 (1974-04-01), Keller
patent: 4593720 (1986-06-01), Bergandy
patent: 4852605 (1989-08-01), Gouhier
Rivell John
Robert & Bosch GmbH
Striker Michael J.
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