Frequently Asked Questions
How does a Gas Spring (Gas Strut) work?
Struts Australia’s Gas Springs are a self-contained pneumatic device capable of producing very large forces (0 to 2000 Newtons) from a compacted piece. A typical Gas Spring consists of a shaft connected to a piston, which moves within the cylinder. This contains nitrogen at high pressure with a hole in the piston allowing gas pressure to pass through and act equally on both sides of the piston. The shaft passes through a seal at one end of the cylinder and it is the pressure acting on the shaft cross section which provides the spring its force.
Should a Gas Spring be mounted Shaft up or Shaft down?
Shaft down is the preferred Position for mounting a Gas Spring. An optimum design would permit the support to be oriented shaft down through its entire actuation. There are several reasons for this. In order to achieve the damping or cushion at the end of the Gas Spring's stroke, the piston assembly inside of the Gas Spring must travel through oil at the end of the stroke. With the shaft down orientation ensures that the oil is in the proper location for damping to occur. Shaft down orientation also ensures that the shaft and sealing components are lubricated with every stroke of the Gas Spring. This reduces seal wear and helps to prevent corrosion.
How does temperature affect the life and performance of a Gas Spring?
Temperature affects Gas Springs in two ways, output force could change and increased susceptibility to gas loss. As the temperature of the Gas Spring changes, the internal pressure changes according to the relationship. Therefore, as the temperature increases, so does the internal pressure. As the internal pressure increases, so does the output force. Very high or very low temperatures can adversely affect the Gas Spring's ability to retain its gas charge. At very high temperatures, the permeability of the seals increases and the gas molecules may diffuse through the seal more quickly. Struts Australia Gas Springs can support and perform reliably at temperatures ranging from 4.5˚C to 150˚C.
What is the expected life of a Gas Spring?
When calculating approximate life of a Gas Spring, one must first determine how much force the support can lose before the application becomes unacceptable. The time it takes to lose this amount of force is considered to be the life of the Gas Spring. All Gas Springs lose output force over time. The rate at which force loss occurs varies greatly by application. Many factors affect the rate of force loss, such as: size of the support, orientation, amount of cycles, ambient temperature, vibration, and the geometry of the application. Considering all of the variables, it is very difficult to estimate life accurately without actual testing in the application. Struts Australia has surpassed 40,000 strokes in a certified test lab environment.
What type of warranty does Struts Australia offer on its products?
Struts Australia offers a 2-year warranty on all of our Gas Springs. Struts Australia warrants products to be free of defects in relation to parts and or workmanship for a period of 2 years from the date invoice.