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308AA00704A - 5-WAY - ESVL9-10-F0-0-00-0-A - DANFOSS
Description: ESVL9-10-F0-0-00-0-A
Function: Proportional Directional Valve, 5-way, 3-position, Spool Type, Non-Compensated
Proportional Directional Valve, 5-way, 3-position, Spool Type, Non-Compensated 250 bar [3600 psi] • 23I/min [6 US gpm]
This is a 5-way, 3-position, spool type, non-compensated proportional directional valve. In its de-energized condition, ports 5 and 1 are blocked, while ports 2 and 4 are open to port 3. Increasing the current to the bottom coil will cause the spool to move, proportionally opening flow from port 5 to 4 with return flow from port 2 to 3. Increasing the current to the top coil will proportionally open flow from port 5 to 2 with return flow from port 4 to 3. In both cases, port 5 will also be opened to port 1, which acts as the load sense port. 
308AA00705A - 5-WAY - ESVL9-10-F0-0-00-C-A - DANFOSS
Description: ESVL9-10-F0-0-00-C-A
Function: Proportional Directional Valve, 5-way, 3-position, Spool Type, Non-Compensated, Load Sense Check
250 bar [3600 psi] • 231/min [6 US gpm] 
This is a 5-way, 3-position, spool type, non-compensated proportional directional valve. In its de-energized condition, ports 5 and 1 are blocked, while ports 2 and 4 are open to port 3. Increasing the current to the bottom coil will cause the spool to move, proportionally opening flow from port 5 to 4 with return flow from port 2 to 3. Increasing the current to the top coil will proportionally open flow from port 5 to 2 with return flow from port4 to 3. In both cases, port 5 will also be opened to port 1, which acts as the load sense port.
401AA00001A - CHECK VALVE, PILOT OPERATED 4CK301S - DANFOSS
Description: 4CK301S
Function: Pil. Op. Check valve, pilot on 3, no o-ring, 3:1
Check valve, Standard Direction 350 bar [5000psi] - 30/min [8 US gpm] 
Description and operation: this is a Check valve where free flow takes place from port 2 to 1 and is blocked from port 1 to 2 ultill pilot pressure is applied to port 3.
401AA00016A - CHECK VALVE, PILOT OPERATED 4SK303S - DANFOSS
Description: 4SK303S
Function: Pil. Op. Check valve, pilot on 3, no o-ring, 3:1
Check valve, Standard Direction 350 bar [5000psi] - 30/min [8 US gpm] 
Description and operation: this is a Check valve where free flow takes place from port 2 to 1 and is blocked from port 1 to 2 ultill pilot pressure is applied to port 3.