Gas springs are pneumatic force accumulators mainly used to lift, hold open and smoothly lower hatches, covers, lids and doors. A gas spring, not equipped with a lock device, functions as follows: the pressure of the compressed nitrogen gas contained in a tube provides the extension force of the spring as the result of the difference between the internal tube pressure and the atmospheric pressure. The gas flows from the highest to the lowest pressure compartment of the tube through a self-cleaning orifice in the piston rod causing the spring rod to telescope out of the pressure tube.
Each tube incorporates a small quantity of oil that provides lubrication of the seals and of the piston rod and, at the same time, a damping medium to control the opening speed of the cover or hatch.
Ideal damping conditions are obtained when the spring gas is mounted with an angle of 30° from the vertical axis with the piston rod turned towards the hinge point: this proper installation provides optimal performance and appropriate oil damping operation.
If your application allows for quite large opening angles, a pointing up piston rod mounting may be more appropriate, especially if the opening operation includes the passage of the rod from the horizontal position. When the spring rotates from B to C, the oil leaks into the gas through the orifice in the piston rod; the residual quantity of oil that remains between rod and conductors provides appropriate spent travel damping.
With the piston rod pointing down and the spring in closed position, the oil is almost all leaked into the gas through the holes and the residual quantity of oil remained between internal surface and piston head is not sufficient to provide a good spent travel damping.
• The rod surface should be protected against physical or chemical damages.
• Lateral loads should be carefully avoided.
• Attachment pivots should be well aligned.
• Springs should be mounted according to previous installation instructions ensuring correct orientation.
• Tensile forces exceeding the output force as indicated for each single spring should be avoided.
• Working temperature – 30 ° C and + 80 °C.