Extras

The piston rod sealing can only be integrated into lockable gas springs and are installed on the threaded end of the rod. They prevent the intrusion of moisture, cleaning agent and other foreign matter into the actuation system of a locking gas spring.
Locking gas springs with a piston rod seal are mainly used in medical applications, such as hospital beds, which, for reasons of hygiene, are cleaned in automated washing machines, using a detergent emulsion.

The oil chamber permanently lubricates the piston rod / sleeve. This reduces friction and makes it possible to install the gas spring in any orientation, while preventing the seal from drying out. When selecting the right gas spring for a specific application, please take into account that the usable stroke may be shorter than normal. 

Just as the side valve, the filling valve allows the precise force adjustment of the gas spring to local conditions. Unlike the horizontal valve, the regular valve is located on the threaded end of the base. In case of a pneumatic tension spring the valve takes the form of a valve top on the piston rod. The connector must be unscrewed to provide access to the threaded end. There is a 2.5 mm hole in the center of the threaded end. Insert a flattened pin with a diameter of less than 2.5 mm into the hole. Using a 200-gram hammer or similar, strike the top of the pin, allowing the hammer to rebound. Never push on the pin for extended periods of time (caution: gas and oil can escape through the valve. Observe safety rules!). Strikes with excessive force or an excessive number of strikes can damage the valve beyond repair. Pressing down the valve pin too long will lead to an uncontrolled escape of gas and can even result in a complete loss of pressure. When adjusting two gas springs at the same time, we recommend that you keep count of your strikes, in order to achieve a similar extension force on both springs. It is advisable to limit yourself to no more than five strikes. Afterwards, the spring should be tested for tightness by placing a drop of oil on the valve hole and monitoring the oil for about one minute to see if there is any leakage. In case of leakage, you should actuate the valve again briefly and repeat the test. If necessary, repeat the entire process. If released pressure should have resulted in insufficient extension force, the gas spring can be refilled by HAHN Gasfedern.

Independent of its installation position, the floating piston functions as a hydraulic damper. It dampens the speed across the entire stroke of the gas spring. 

The short release for locking gas springs is 0.1 to 0.2 mm as opposed to the standard 2 – 5 mm. In case of a short actuation the actuation stroke of the trigger plunger is only 0.1 to 0.2 mm (standard value: 2 – 5 mm). Thereby, a lockable gas spring responds to small actuation inputs, as opposed to requiring at least a 3mm input to respond.

The B3 sealing system is used for gas springs experiencing high forces and increased stress (vibration), e.g. in construction machines. It allows the spring to be installed in any position. When selecting the correct size of the spring for the application at hand, please take into account that the usable stroke may be reduced. 

The NT low temperature design is used for ambient temperatures of up to -40°C. It allows the spring to be installed in any position. When selecting the correct spring size for the application at hand, please take into account that the usable stroke may be reduced.

The HT high temperature design is used for ambient temperatures of up to 200°C. It allows the spring to be installed in any position. When selecting the correct spring size for the application at hand, please take into account that the usable stroke may be reduced.