Hydraulic cylinders with options
We manufacture hydraulic cylinders with sensors that give your system the information it needs. We primarily use inductive linear sensors that work completely contact-free and are almost inexhaustible. Our cylinders contain sensors from the majority of leading manufacturers. Having a sensor in your cylinder creates completely new possibilities in terms of interaction between cylinder, hydraulic system and user.
When there is a need to know exactly in which position the cylinder is, positioning sensors are used. These are also called linear transducers or position transducers. The advantage is that the sensor constantly keeps track of the position of your hydraulic cylinder and these can be used for a variety of functions. You can, for example, change pressure and flow depending on position or create a damping function that can be programmed differently depending on the user.
Internal or external sensors
Sensors can be mounted inside or outside the hydraulic cylinder, depending on the conditions. Most commonly, positioning sensors are mounted in the cylinder and a sensor rod goes into a hollow piston rod. The position is measured using a magnet mounted into the piston. In some cases, when this solution is not possible, a sensor rod can be mounted externally and then reads the position of the magnet through the tube walls.
End position sensor
End position sensor is a simpler type of sensor and can be used to show when the hydraulic cylinder is in the maximum extended position or alternatively when the cylinder is in the most retracted position. These are often mounted externally in a connection port.
We offer hydraulic cylinders with damping where end-damping can be obtained on both the push and pull side of the cylinder. In this way, hard shocks can be avoided. Depending on how the cylinder is used, functions can be built in to quickly restart the cylinder in the reverse direction.
Mechanical damping, or hydraulic damping as it actually is, works by controlling the oil flow successively as the cylinder approaches its end position. There are a large number of different solutions for this, depending on the character you want to achieve and how the cylinder works.
By using some type of sensor (read above), you can control the damping electronically with the hydraulic system’s control system. The advantage is that you can change the character, for example, depending on the load or the operator’s wishes.
As extra safety when handling heavy loads, different types of hydraulic cylinders with valve functions are used. We use, among other things, load securing valves, over center valves and hose break valves. These can be built into, for example, the end of the hydraulic cylinder or externally connected with connecting pipes.
Load holding valves
A load securing valve or pilot controlled check valve is a type of valve that secures the load in the event of a failure in the hydraulic system. This is because a small back pressure is always required to open the main flow in the valve.
Over center valve
An overcenter valve is actually a type of load holding valve, but which automatically secures the load holding when the power switches between the pull and push side of the hydraulic cylinder.
Hose break valves
Normally mounted directly on the hydraulic cylinder connection and secures the load from falling if a hose breaks. It stops the movement of the cylinder if the flow becomes too high, i.e. if the load falls faster than it does during normal operation.
Normally the cylinder is fed by a connection at each end for movement in either direction. In some cases, other solutions may be required. Examples of this are feeding both sides of the cylinder through the piston rod, through connecting pipes or valve blocks. With great flexibility, you create a product the way you want it.