The HTL springs can be used where, for instance, the blank holder should be locked in its bottom position to avoid deformation of the formed part. The HTL Controllable Springs are available as 15 kN, 30 kN, 50 kN, 75 kN springs with stroke lengths from 10 to 160 mm. As the stroke length always has to be fully utilized, the springs can be ordered with any stroke length between 10 and 160 mm (in increments of 1 mm).

For optimal performance, the full stroke should be used within ± 0.5 mm.

Usually the control system of the press controls the return stroke of the HTL Controllable Gas Springs.

The springs can either be installed self-contained or connected to a Control Unit through a hose system. It is recommended that the HTL Controllable Gas Springs are connected to a Control Unit.

When a standard HTL Gas Spring is locked in its bottom position, a maximum of 1 mm spring-back can be expected before the piston rod to a complete stop. If necessary, this spring-back action can be fully eliminated by connecting the HTL spring, through a valve block, to a passive spring (HAE).

One or more HTL springs connected to a HAE spring is called a Positive Lock System, HTL + HAE.