Fluid handling – Systems – Multi-way valve unit
Patent
1980-06-16
1982-07-27
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
91438, 91441, 91451, 13759615, 1375962, F15B 13042
Patent
active
043412432
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to pressure regulating valve and in particular to pressure regulating valves for use in fluid systems requiring venting of a system component.
2. Background Art
In U.S. Pat. No. 3,840,049, of Jesse L. Field, Jr., which patent is owned by the assignee hereof, a control system for use in controlling positioning of a fluid motor is shown to include a directional control valve which is operated by a pilot valve so as to provide pressurized fluid selectively to opposite ends of a piston cylinder for suitably positioning the piston therein. The directional control valve includes a make-up valve which automatically opens a bypass passage between the fluid motor ports and a fluid return passage when necessary to prevent cavitation of the motor, such as may result from an overrunning condition from an external load force. The pilot valve is connected with a float valve which has a spool shifted by the fluid pressure against a spring bias in the normal operation of the system. When desired, the manual pilot valve is shifted to a float position.
In U.S. Pat. No. 3,766,944, of Josef Distler, a pilot-controlled fluid flow regulating valve is shown. The regulating valve includes a spool which is moved relative to a neutral position by fluid from a pilot valve. The regulating valve includes a manually operated handle for controlling the disposition of a piston mounted in the body of the pilot valve.
Other background patents of interest in connection with pressure regulating valves include those of Franz Forster et al U.S. Pat. No. 3,698,415; Egon Zunzer U.S. Pat. No. 3,817,153; Eugene E. Latimer U.S. Pat. No. 3,987,703, which patent is owned by the assignee hereof; and British Pat. No. 1,494,400 of Nordhydraulic AB, a Swedish corporation. The Zunzer patent shows a pressure reducing pilot valve used in another fluid control application. The Forster et al patent shows a pressure regulating valve wherein the control member bears upon the valve body via plurality of springs, at least one of which comes into play only after the control member has been displaced through a predetermined extent. The Forster et al patent shows a regulating pilot valve similarly used in a different system application.
In the Latimer patent, the pilot-controlled hydraulic system has a load-supporting cylinder with a valve assembly operative to automatically provide an emergency source of pilot pressure upon failure of the main pilot system. The control utilized pressurized fluid from the load-supporting motors for pilot operation of the system for emergency lowering of te load.
In the British patent, a regulating pilot valve provides an output under certain conditions so as to throw another valve to either of two different extreme positions.
While the background art patents discussed above show different forms of pressure regulating valves such as used in load-lifting fluid systems, the structures thereof are relatively costly and complex and do not provide the improved, simplified construction of the present invention.
DISCLOSURE OF INVENTION
The present invention is directed to overcoming one or more of the problems as set forth above.
In one aspect of the present invention, the invention comprehends an improved control for providing a venting function as a result of a novel arrangement of a pressure regulating pilot valve.
In the present invention, the venting function is produced by direct mechanical connection between the connector from the handle to the spool of the pilot valve.
The spool of the pilot valve is normally spring-biased to provide the desired pressure regulating function. The valve, however, is arranged so that, under conditions wherein venting of the control valve of the system is desired, the biasing spring is overcome to permit the desired direct connection between the control handle and spool valve, permitting the operator to positively move the spool valve to an arrangement wherein the desired venting connection is effected.
In the illustrated embodiment, the spool va
REFERENCES:
patent: 3698415 (1972-10-01), Forster et al.
patent: 3766944 (1973-10-01), Distler
patent: 3817153 (1974-06-01), Zunzer
patent: 3840049 (1974-10-01), Field
patent: 3987703 (1976-10-01), Latimer
patent: 4184512 (1980-01-01), Pignolet
Caterpillar Tractor Co.
Michalsky Gerald A.
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