Fluid handling – Systems – Supply and exhaust
Patent
1998-04-01
1999-11-02
Michalsky, Gerald A.
Fluid handling
Systems
Supply and exhaust
13759616, 137884, F15B 13043
Patent
active
059751347
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a central block of a pilot controlled valve system with seat and/or piston valves having a preferably standardised connection interface as well as a pilot valve interface for receiving a pilot valve and being equipped with a pump conduit (P), a tank conduit (T), a first work conduit (A), a second work conduit (B), a first control conduit x and a second control conduit y. Four valve reception cavities for receiving one valve unit (C1, C2, C3, C4) each are provided in the central block.
Valve systems having pilot controlled seat and/or piston valves and having such a central block are known for example from DE-OS 36 04 410, GB 2,212,220 A or from EP 0 473 030 A1.
The DE-OS 36 04 410 discloses a hydraulic control block with a pilot valve, a four port control valve being pilot controlled by the pilot valve, a pressure reducer, a one-way valve and a one-way restrictor. Each of the afore-mentioned elements is hereby located in a separate housing made of cast iron and is connected with the other housing blocks only by means of separate, corresponding hydraulic conduits.
The GB 2,212,220 or EP 0 473 030 A1 disclose a proportional four port control valve with pilot controlled seat valves being located in a housing block cast in iron especially to this purpose, just as the four port control valve disclosed in the DE-OS 36 04 410. This housing block receiving the valve units and referred to in the following as central block is interspersed with hydraulic conduits which assure a hydraulic connection between the four valve units located in the central block.
Production optimized seat valves or combined piston-seat valves are used as valve units and are inserted into corresponding valve reception cavities provided in the central block. These valves are then fastened by means of a lid screwed in the central block. According to the operative range, further components, such as for example a one-way valve, an electromagnetic proportional control unit or the like, and/or more valves, can be installed onto these valves. Such valve units are called cartridges (Cartridge-technique).
The lower side of the control block (DE 36 04 410), or the lower side of the central block (EP 0 473 030) is designed as a connecting interface and has a standard bore scheme according to DIN 24340 so that the control block or the central block can be connected to nearly any new and existing hydraulic system.
The valves located in the central block can be connected in different ways. Therefore, the valves are connected, according to the principles of logic, by means of "and", "or" or "nand" connections. By choosing appropriate valve units (Cartridges) and by combining adequately the valve units, hydraulic circuits can be realized for nearly any application.
Each application requires another connection of the valves, so that for each application an individual central block with the specific hydraulic connections for the respective hydraulic circuit has to be cast. This entails high production costs. As the connection conduits can run slantwise, diagonally or with angles, they have to be incorporated during the cast in the form of a core, rendering thus the manufacturing of such a central block even more expensive.
Since each application requires the manufacturing of its own central block, to store and to keep spare central blocks available becomes very expensive.
When using these valve systems in plastic die casting machines or in industrial robots for example, it may happen that after some time another application required, so that a modified hydraulic circuit has to be used in the plastic die casting machine or in the industrial robot. In this case, the whole central block has to be exchanged and replaced by a new one, so that very high material and mounting costs result from such a procedure.
Starting from these premises, the object of the present invention is to provide a central block for a pilot controlled valve system with seat and/or piston valves which can be used universally for as many hydraulic circuits as
REFERENCES:
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patent: 3976098 (1976-08-01), Raymond
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patent: 4230143 (1980-10-01), Dettmann et al.
patent: 4359064 (1982-11-01), Kimble
patent: 4516604 (1985-05-01), Taplin
patent: 4711267 (1987-12-01), Schwelm
patent: 4723576 (1988-02-01), Raymond
patent: 5372060 (1994-12-01), Maruyama et al.
Pippenger: "Hydraulic Cartridge Valve Technology" 1990, Amalgam Publishing Comp., pp. 180-187.
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