Why there is a creeping phenomenon in the hydraulic cylinders work? How to solve?

Why there is a creeping phenomenon in the hydraulic cylinders work? How to solve?
1) cylinder air intrusion. Additional exhaust, or the cylinder to the rapid movement of the maximum stroke, forced to exclude the air.
2) the hydraulic cylinder end caps at the ring too tight or too loose. Should be adjusted to ring the appropriate tightness to ensure that the piston rod hand back and forth steady pull without leakage.
3) the piston and the piston rod concentricity bad. Shall be calibrated, adjusted.
4) The hydraulic cylinder is installed is not parallel with the rail. Should be adjusted or re-install.
5) the piston rod bending. Should be straightening the piston rod.
6) piston rod poor rigidity. Increase the diameter of piston rod.
7) hydraulic cylinder moving parts between the gap is too large. Should be reduced with the gap.
8) the installation location of the hydraulic cylinder offset. Should check the hydraulic cylinder parallel with the rail, and correction.
9) hydraulic cylinder internal diameter linear (drum-shaped, conical, etc.). It should be repaired, re-equipped with piston.
10) cylinder corrosion, galling. Rust and burrs should be removed, and strictly should be boring mill.
11) double rod piston rod of the piston cylinder, both ends of the nut is tightened too tightly, so that concentric bad. Should be slightly loose nut, so that the piston in a natural state.

Hydraulic cylinder hydraulic system What is the role

Hydraulic cylinder hydraulic system What is the role
The hydraulic system components: dynamic components of the control element actuator auxiliary components.
The power element is a hydraulic pump
The control elements are hydraulic valves control the hydraulic oil pressure, flow, direction
The actuator is a hydraulic cylinder hydraulic motor
Auxiliary components, pipe pressure gauge storage oil filter and so on.
The connection method of auxiliary components connect to each of the major components, the hydraulic pump to provide fluid power through hydraulic valve control hydraulic oil into the hydraulic cylinder hydraulic cylinder reciprocating motion.
The hydraulic pump of the first question is to provide high-pressure oil to the fuel tank, but it is controlled by hydraulic valve, hydraulic cylinder actuator.
The second question first to see what the fuel tank (for example, piston double-acting cylinder) determined to see the other parameters of the fuel tank.
hole diameter of the fuel tank
First calculate the size of the load, then the hydraulic system pressure (pressure pump; to determine) to determine the diameter of the hydraulic cylinder, because the F * A = the PF refers to the size of the A load refers to the diameter of the hydraulic cylinder piston . (I say is to make a simple hello to understand if the professionals to see, this is my little problem)
(b) the speed of the fuel tank (flow)
, But to consider the components of the entire system with a hydraulic valve to control the liquid velocity (flow).
c the installation of the hydraulic cylinder distance
This is to see the connection of the hydraulic cylinder, and then fixed.
(d) because the fuel tank of more species, so the main parameters of so many.
Supplementary pump to determine the parameters to determine the rate of pressure hydraulic cylinder 1.F * A = P
Because your load, F, A is determined by the fuel tank, P is determined by the pump, so make sure your oil pump pressure, again considered the diameter of the hydraulic cylinder.
Then look at the speed of your fuel tank requirements, to set the flow of the hydraulic pump so that parameter out.
Pump parameters, not necessarily the kind of oil pump, oil pump, there are three, so it depends on what system. General equipment using a plunger pump.

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