Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1986-08-21
1988-02-16
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374875, 7386156, G05D 706
Patent
active
047248645
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a two-way flow control valve with a hydraulic compensator, which is axially displaceable in cylindrical housing, for the control of the flow through an inlet orifice and one or more outlet orifices provided radially in the housing wall, a control valve for controlling the compensator position, a flow sensor for detecting the flow quantity, a displacement transducer for detecting the position of the flow sensor and for controlling the control valve as a fuction of the position of the flow sensor.
Such valves are generally known and are used to detect and control the flow of a quantity of liquid in a line. The liquid concerned is usually oil, for example in hydraulic control devices, but the application is not confined to oil.
The present invention is based on the object of creating a novel valve of the above mentioned type with a more compact design than the conventional valves and which permits substantially faster switching times.
This object is achieved according to the invention by a valve of the type described above which has the features of the main claim.
Developments of the inventive idea are contained in the sub claims.
The invention is described in more detail below with reference to the enclosed drawing which shows a longitudinal section through a control valve according to the invention in closed position.
The two-way flow control valve shown in the figure is provided in the bend of a hydraulic line 2 and intended to control the flow in the direction of the arrow. The two-way flow control valve is fitted with its housing 4 in such a way that its piston sleeve is seated coaxially in the inlet section 2a and vertically in the outlet section 2b.
The base area of the cylindrical piston sleeve 6 is designed as inlet orifice 8, while one or more radial outlet orifices 10 are provided in the wall of the piston sleeve 6. The flow from inlet 8 in the direction of line section 2b is controlled by a hydraulic cylinder-shaped compensator 12 which is arranged in the piston sleeve 6 and is axially displaceable between a closed position (see figure) and a more or less opened position.
The upper, narrower part of the compensator 12 forms with the inner wall of the piston sleeve 6 a cylindrical annular space 14, in which a spiral spring 16 is arranged around the compensator 12. This spring is restrained between the upper base area of the piston sleeve 6 and a shoulder of the compensator 12, so that its action presses the compensator in the direction of the closed position.
The oil-filled annular space 14 is connected to a control valve 18, which controls the oil pressure in the annular space 14. The position of the compensator 12, and thus the flow through the orifice(s) 10, is consequently governed by the equilibrium between the sum of the expanding force of the spring 16 and of the oil pressure in the annular space 14 on the one hand and the oil pressure in the line section 2a on the other hand.
A flow sensor 20, designed as axially displaceable piston, is coaxially fitted inside the compensator 12. In closed position in accordance with the FIGURE, the lower edge of the sensor 20 is seated on the inner areas 22 of an insert 24 in the piston sleeve 6, which areas converge towards the orifice 8. When the sensor 20 is lifted off this inner area, the changing annular gap between the sensor 20 and the conical inner area forms the measuring point for detection of the flow. The opposite end of the flow sensor 20 is exposed to the action of a spiral spring 26 which bears on the one hand against the housing 4 and on the other hand against the flow sensor 20 and presses the latter in the direction of the closed position.
The flow sensor 20 is hydrostatically completely balanced by means of a longitudinal bore 28 and several cross bores 30.
The vertical position of the flow sensor 20 is determined by a displacement tranducer 32, known per se, preferably by electronic means. This displacement transducer 32, which thus detects the actual value of the flow in the direction of the arrow, is connected
REFERENCES:
patent: 2388672 (1945-11-01), Breaver
patent: 3182500 (1965-05-01), Ishii
patent: 4194394 (1980-03-01), Bartholomaus
patent: 4459860 (1984-07-01), Walters
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