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When the hoist valve of control valve is placed at lifting position, hydraulic oil
enters into the lower part of piston of hydraulic cylinder from pressure-gradient control
valve to selector valve to push rising of piston and lifting of the goods. When the hoist
valve of control valve is placed at descending position, the piston rod drops with the
action of goods, mast, fork bracket and piston itself, the hydraulic oil is pressed back to
oil tank. If the cut-off valve is mounted at the bottom of cylinder (See Fig. 5-17), it can
play the role of protection if the mast rises when high-pressure pipe cracks.
1. upper beam 2. Adjusting shim 3. Dust proof ring 4. Oil seal
5.Guide sleeve 6. O ring 7. Cylinder head 8. Bearing
9. Cylinder body 10. Piston rod 11. Piston 12. Piston oil seal
13. oil seal 14. Seat ring 15. Snap ring 16. Cut-off valve
17. spring lock ring 18. Collar pin 19. Lock nut 20. Adjusting nut
21. end connector 22.chain 23. Chain wheel
Figure 5-10 lifting cylinder
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