A hydraulic valve stack for a work machine is disclosed. The hydraulic valve stack has a base with a first mounting surface and a second mounting surface. The base is connectable to the work machine and has at least one fluid passageway extending through the base from the first mounting surface to t
A hydraulic valve stack for a work machine is disclosed. The hydraulic valve stack has a base with a first mounting surface and a second mounting surface. The base is connectable to the work machine and has at least one fluid passageway extending through the base from the first mounting surface to the second mounting surface. The hydraulic valve stack also has a permanent valve assembly configured to control a permanent function of the work machine and an optional valve assembly configured to control an optional function of the work machine. The permanent valve assembly is connectable to the first mounting surface of the base, while the optional valve assembly is connectable to the second mounting surface of the base. Each of the permanent and the optional valve assemblies have at least one fluid passageway in communication with the at least one fluid passageway of the base.
대표청구항▼
What is claimed is: 1. A hydraulic valve stack for a machine, comprising: a base having a first mounting surface with a first set of mounting structures and a second mounting surface with a second set of mounting structures, the first set of mounting structures being spaced away from the second set
What is claimed is: 1. A hydraulic valve stack for a machine, comprising: a base having a first mounting surface with a first set of mounting structures and a second mounting surface with a second set of mounting structures, the first set of mounting structures being spaced away from the second set of mounting structures, the base being connectable to the work machine and having at least one fluid passageway extending through the base from the first mounting surface to the second mounting surface, the first mounting surface including an inlet configured to provide the only fluid communication from a pressurized source to valves mounted on the second mounting surface; a permanent valve assembly configured to control a permanent function of the work machine, being connectable to the first mounting surface of the base, and having at least one fluid passageway in communication with the at least one fluid passageway of the base; and an optional valve assembly configured to control an optional function of the work machine, being connectable to the second mounting surface of the base, and having at least one fluid passageway in communication with the at least one fluid passageway of the base. 2. The hydraulic valve stack of claim 1, wherein the first surface of the base is configured to receive at least a first fastener to retain the permanent valve assembly, and the second surface of the base is configured to receive at least a second fastener to retain the optional valve assembly. 3. The hydraulic valve stack of claim 2, wherein the optional valve assembly is removable without disassembly of the at least a first fastener. 4. The hydraulic valve stack of claim 1, further including an end plate connectable to the optional valve assembly and configured to close off the at least one fluid passageway of the optional valve assembly. 5. The hydraulic valve stack of claim 4, further including a plurality of optional valve assemblies, wherein each of the plurality of optional valve assemblies are connectable to each other, to the base, and to the end plate. 6. The hydraulic valve stack of claim 5, wherein each of the plurality of optional valve assemblies includes at least one fluid passageway in communication with the at least one fluid passageway of the base. 7. The hydraulic valve stack of claim 1, further including an inlet cover connectable to the work machine and to the permanent valve assembly, the inlet cover having at least one external port in fluid communication with the at least one fluid passageway of the permanent valve assembly. 8. The hydraulic valve stack of claim 7, further including a plurality of permanent valve assemblies, wherein each of the plurality of permanent valve assemblies are connectable to each other, to the base, and to the inlet cover. 9. The hydraulic valve stack of claim 8, wherein the plurality of permanent valve assemblies each include at least one fluid passageway in communication with the at least one fluid passageway of the base and the inlet cover. 10. The hydraulic valve stack of claim 7, wherein the work machine has a source of pressurized fluid and the external port is in fluid communication with the source. 11. The hydraulic valve stack of claim 7, wherein: the work machine has a reservoir; the at least one external port is a first external port; and the inlet cover includes a second external port in fluid communication with the reservoir. 12. The hydraulic valve stack of claim 11, wherein: the at least one fluid passageways of the permanent valve assembly, the base, and the optional valve assembly are first fluid passageways; and the permanent valve assembly, the base, and the optional valve assembly each include at least a second fluid passageway in fluid communication with the second external port and with each other. 13. The hydraulic valve stack of claim 12, wherein the work machine has at least one permanent fluid actuator and the inlet cover includes: a third external port in communication with the at least one permanent fluid actuator; and a fourth external port in communication with the at least one permanent fluid actuator. 14. The hydraulic valve stack of claim 13, wherein the permanent valve assembly includes: a third fluid passageway in communication with the third external port; a fourth fluid passageway in communication with the fourth external port; and a valve element configured to selectively connect the third and fourth fluid passageways with the first and the at least a second fluid passageways of the permanent valve assembly. 15. The hydraulic valve stack of claim 14, wherein: the base includes: a third fluid passageway in communication with the third fluid passageway of the permanent valve assembly; and a fourth fluid passageway in communication with the fourth fluid passageway of the permanent valve assembly; and the optional valve assembly includes: a third fluid passageway in communication with the third fluid passageway of the base; a fourth fluid passageway in communication with the fourth fluid passageway of the base; at least one external port; and at least one valve element configured to meter pressurized fluid between at least one of the third and fourth fluid passageways of the optional valve assembly and the at least one external port of the optional valve assembly. 16. The hydraulic valve stack of claim 1, further including at least a first sealing device disposed between the base and the permanent valve assembly and at least a second sealing device disposed between the base and the optional valve assembly to restrict fluid leakage from the hydraulic valve stack. 17. A method of expanding a hydraulic valve stack having at least one permanent valve assembly connected to a base, the method comprising: removing an end plate from the hydraulic valve stack without loosening the connection between the at least one permanent valve assembly and the base; operatively connecting an optional valve assembly to the base, the base including a single inlet connected to a pump and providing the only fluid communication from the pump to the at least one permanent valve assembly and the optional valve assembly; and reassembling the end plate. 18. The method of claim 17, wherein the at least one permanent valve assembly is connected to the base via at least a first fastener and removing includes removing at least a second fastener and detaching the end plate while the at least a first fastener remains connected. 19. The method of claim 17, wherein operatively connecting includes connecting the optional valve assembly to a side of the base opposite the permanent valve assembly. 20. The method of claim 17, wherein operatively connecting includes connecting the optional valve assembly to an existing optional valve assembly that is connectable to the base. 21. A method of maintaining a hydraulic valve stack having at least one permanent valve assembly and at least one optional valve assembly connected to a base, the method comprising: removing one of an end plate and an inlet cover from the hydraulic valve stack while at least one of the at least one permanent valve assembly and the at least one optional valve assembly remains substantially connected to the base, the base configured to provide the sole fluid communication, from a pressurized source, between the at least one permanent valve assembly and the at least one optional valve assembly; accessing one of the at least one permanent and the at least one optional valve assembly; and reassembling the one of the end plate and the inlet cover. 22. The method of claim 21, wherein the at least one permanent valve assembly is connected to the base via at least a first fastener, the at least one optional valve assembly is connected to the base via at least a second fastener, and removing includes removing one of the at least a first fastener and the at least a second fastener and detaching the one of the end plate and the inlet cover while the other of the at least a first fastener and the at least a second fastener remains connected. 23. The method of claim 21, wherein accessing includes at least one of inspecting, cleaning, adjusting, and replacing a component of the one of the at least one permanent valve assembly and the at least one optional valve assembly. 24. A machine, comprising: a source of pressurized fluid; a reservoir; at least one permanent fluid actuator; at least one optional fluid actuator; and a hydraulic valve stack in fluid communication with the source of pressurized fluid, the reservoir, the at least one permanent fluid actuator, and the at least one optional fluid actuator, the hydraulic valve stack including: a base having a single inlet to receive fluid from the pressurized source, the base having a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface receiving fluid from the pressurized source exclusively from the single inlet, the base being connectable to the work machine and having at least one fluid passageway extending continuously through the base from the first mounting surface to the second mounting surface, the first and second mounting surfaces including a first set of bores and a second set bores respectfully, wherein the first set of bores is not continuous with the second set of bores; a permanent valve assembly configured to control the at least one permanent fluid actuator, being connectable to the first mounting surface of the base, and having at least one fluid passageway in communication with the at least one fluid passageway of the base; and an optional valve assembly configured to control the at least one optional fluid actuator, being connectable to the second mounting surface of the base, and having at least one fluid passageway in communication with the at least one fluid passageway of the base. 25. The machine of claim 24, wherein the first surface of the base is configured to receive at least a first fastener to retain the permanent valve assembly, and the second surface of the base is configured to receive at least a second fastener to retain the optional valve assembly. 26. The machine of claim 25 wherein the optional valve assembly is removable without disassembly of the at least a first fastener. 27. The machine of claim 24, wherein the hydraulic valve stack further includes an end plate connectable to the optional valve assembly and configured to close off the at least one fluid passageway of the optional valve assembly. 28. The machine of claim 27, wherein the hydraulic valve stack further includes a plurality of optional valve assemblies, wherein each of the plurality of optional valve assemblies are connectable to each other, to the base, and to the end plate. 29. The machine of claim 28, wherein each of the plurality of optional valve assemblies includes at least one fluid passageway in communication with the at least one fluid passageway of the base. 30. The machine of claim 24, wherein the hydraulic valve stack further includes an inlet cover connectable to the work machine and to the permanent valve assembly, the inlet cover having at least one external port in fluid communication with the at least one fluid passageway of the permanent valve assembly and the source. 31. The machine of claim 30, wherein the hydraulic valve stack further includes a plurality of permanent valve assemblies, wherein each of the plurality of permanent valve assemblies are connectable to each other, to the base, and to the inlet cover. 32. The machine of claim 31, wherein the plurality of permanent valve assemblies each include at least one fluid passageway in communication with the at least one fluid passageway of the base and the inlet cover. 33. The machine of claim 30, wherein: the at least one external port is a first external port; and the inlet cover includes a second external port in communication with the reservoir. 34. The machine of claim 33, wherein: the at least one fluid passageways of the permanent valve assembly, the base, and the optional valve assembly are first fluid passageways; and the permanent valve assembly, the base, and the optional valve assembly each include at least a second fluid passageway in fluid communication with the second external port and with each other. 35. The machine of claim 34, wherein the inlet cover includes: a third external port in communication with the at least one permanent fluid actuator; and a fourth external port in communication with the at least one permanent fluid actuator. 36. The machine of claim 35, wherein the permanent valve assembly includes: a third fluid passageway in communication with the third external port; a fourth fluid passageway in communication with the fourth external port; and a valve element configured to selectively connect the third and fourth fluid passageways with the first and the at least a second fluid passageways of the permanent valve assembly. 37. The machine of claim 36, wherein: the base includes: a third fluid passageway in communication with the third fluid passageway of the permanent valve assembly; and a fourth fluid passageway in communication with the fourth fluid passageway of the permanent valve assembly; and the optional valve assembly includes: a third fluid passageway in communication with the third fluid passageway of the base; a fourth fluid passageway in communication with the fourth fluid passageway of the base; at least one external port; and at least one valve element configured to meter pressurized fluid between at least one of the third and fourth fluid passageways of the optional valve assembly and the at least one external port of the optional valve assembly. 38. The machine of claim 24, wherein the hydraulic valve stack further includes at least a first sealing device disposed between the base and the permanent valve assembly and at least a second sealing device disposed between the base and the optional valve assembly to restrict fluid leakage from the hydraulic valve stack.
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