We have a cylinder mounted with the rod pointing down. It has a weight on the end of the rod.
There is a ball valve at each cylinder port.
Assumptions:
What happens when the cylinder is fully retracted and both ball valves are closed?
How does a flow control control flow since all the oil in equals all the oil out?
Single Rod Cylinder – vertically mounted with rod up
10″ Bore, 4″ Rod, 10″ stroke
Cap is vented to atmosphere and Rod end is plugged; assume no leakage.
Cylinder is about 3/4 extended.
What happens when a 500 lb load is applied to the rod?
The system consists of a fixed RPM electric motor, fixed displacement pump, system relief, cylinder, directional valve, and reservoir. If the cylinder is extending at a constant speed and the load opposing cylinder travel increases what happens to the speed of the cylinder?
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Are the pressures on the Cap side and Rod side of a cylinder in a regenerative circuit equal?
The flow across any hole is determined by the pressure drop or differential pressure across the hole and the temperature of the fluid. Pressure compensation keeps the pressure drop across the hole relatively constant regardless of the inlet or outlet pressure at the hole.
The spring is an essential part of any hydraulic system. One must understand the deflection vs force on the spring; this is called the spring constant. The greater the spring is deflected from its free state the more force it takes to deflect it further. This is a linear relationship. Cracking pressure is a result of the preload on the spring. Pressure drop vs flow is a result of the spring constant and the square root relationship of pressure drop vs flow during turbulent flow.
Question of the day: What 2 things determine pressure at the pump outlet?
A cylinder will travel at a constant velocity from 0-100% as long as the forces on both sides of the piston, the load force, and any other forces such as friction are in balance. When the forces are not in balance the piston and rod will accelerate (positively or negatively) until the forces are once again in balance.