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Multi-stage hydraulic cylinders are composed of two or more piston cylinders, mainly consisting of cylinder head, cylinder cylinder, sleeve, piston and other parts. There are inlet and outlet ports A and B at both ends of the cylinder barrel. When port A is filled with oil and port B is filled with oil, the larger effective area of the first stage is pushed first. The piston moves, then pushes the smaller secondary piston. Because the flow rate into the A port remains constant, the piston with a large effective area of action moves at a low velocity and a high thrust, while the reverse is true. High and low thrust. If port B is fed with oil and port A is returned, the secondary piston will retreat to the end of the line before the primary piston retreats.

Multi-stage hydraulic cylinder features:
The working stroke can be very long and can be shortened when not in operation. Suitable for long travel distances where space is limited, e.g. telescopic boom for dump trucks and cranes. When the telescopic hydraulic cylinder is extended step by step, the effective working area decreases gradually. When the input flow rate is unchanged, the outreach speed increases gradually; when the external load is unchanged, the working pressure of the hydraulic cylinder increases gradually. When the external load remains constant, the working pressure of the cylinder will increase gradually. Therefore, multi stage hydraulic cylinder is used where the cylinder needs to be tilted or rotated vertically.

Structural design of hydraulic cylinders:
1. There are many types of connections between the cylinder body and the cylinder, including tie rod connections, flange connections, inner half-ring connections, and welded connections.

2. The connection between the piston and the piston rod mostly uses a threaded connection structure and key connection structure. The threaded connection structure is simple and practical, more common applications; the key-lock coupling is suitable for cylinders with high working pressure and high mechanical vibration.

4.In the case of a cylinder, the hydraulic pressure, mechanical forces and safety factors all have an impact on the cylinder. Hydraulic cylinders are damaged by loss of normal working capacity due to high pressure, often in the form of strength, stiffness and qualitative problems. The most important of which is strength, to ensure the strength of the cylinder, and it is important to consider the appropriate safety factor.http://www.jcforging.com/products/tg-e-multi-stage-hydraulic-cylinders.html