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3. HIGH PRESSURE CORE = the passage which is common to the inlet section and the spool section of the main valve and directs pump flow to the spool sections. 4. DRAIN PASSAGE = the passage which allows portions of the surface area between main valve sections to bleed-off directly to the outlet.
5. FLOW CONTROL = the inlet section component between the inlet and outlet ports. 6
5. MAIN RELIEF VALVE = the element located inside of the flow control poppet. It is a pilot operated (compound) relief valve, and has the capacity to limit the working pressure at full pump flow. 6. LOW PRESSURE RELIEF VALVE = the assembly located between the low pressure core and the outlet, and provides a controlled back pressure in the low pressure core when oil is returning from an actuator.
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7. LOAD CHECK POPPET = the check valve that allows free flow from the inlet to the high pressure core and prevents flow from the high pressure core to the inlet. 8. ANTI-VOID POPPET = the check valve that allows free flow from the low pressure core and prevents flow from the high pressure core from entering the low pressure core.
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9. PILOT SUPPLY ORIFICE = the orifice that is located between the inlet and the spring side of the flow control valve. It is in conjunction with the flow flow control spring, which regulates the amount of pilot flow to the pilot valve. 10. PILOT SUPPLY PORT = the port connection for directing flow from the pilot supply orifice to the pilot valve inlet. (See drawings above and below for reference)
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11. FLOW CONTROL or DAMPENING POPPET = this is an orifice / check valve arrangement located between the pilot supply orifice and the spring side of the flow control. This arrangement regulates the the filling or exhausting of the volume volume of oil behind the flow control. control. The orifice slows the movement of the flow control and prevents sudden changes in the direction of the pump flow, and thereby reduces shocks or surges. 12. WORK PORT or WORKING PORT = the port connection on the main valve spool section for a working line to be connected to one side of an actuator.
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13. LONG HOLE = this term relates to the cross drilled hole in the spool section, which covers and provides a passage for flow from the low pressure core to its corresponding main spool. 14. MAIN SPOOL = There are one main spool for each work port and they are spring biased at both ends. This is to block the work port from the high and low pressure cores when there is no flow through the spool cross-holes. When there is flow from the pilot valve to the main valve work port (through the cross-holes) a positive differential pressure at the top of the spool will overcome the bottom spring bias and the spool will overcome the top spring bias and the spool will shift to connect the work port to the low pressure core.
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15. RESTRICTOR POPPETS = these check valves are located in the main spools and are identified as DAMPENING POPPETS in the above diagram. They permit free flow from the work port to the pilot port and restrict flow from the pilot port to the work port. port. They are also used to to control spool response response and / or spool movement during void conditions.
16. PILOT VALVE INLET SECTION = the port connection for receiving pilot flow from the main valve pilot supply port. 17. PILOT VALVE OUTLET = connection for return to tank.
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18. CENTER PASSAGE = the passage that directs pilot flow from the inlet to the outlet of the pilot valve when the spool is centered or in the float position. 19. BRIDGE CORE = this passage directs flow from the center passage to a control port when the pilot valve spool is shifted.
20. PILOT SPOOL = the element in the system which is controlled directly by the operator of the unit. The pilot spool transforms the small pilot flow from the main valve into control signals which cause the main valve to direct the large working flow. 21. LOAD CHECK = the valve that allows free flow from the center passage to the bridge core and prevents flow from the bridge core to the center passage. 22. SOLENOID VALVES = located on the pilot control valve, which when activated by an operators selector will shift the flow of pilot pressure to the Split Spool Pilot Valve.
