Link arm door closers A controlled, efficient locking: each and every one of our door closers features a minimum of two valves for the hydraulic monitoring of the locking. Our multi-force models also provide several forces in one single model in order to adapt to the width, the weight and the particularities of the door to be monitored. CT3000 door closer CT1800 door closerCT1800 door closer. Certified in compliance with EN 1154 … CT2500 door closerCT2500 door closer. Certified in compliance with EN 1154 … CT2800 door closerCT2800 door closer. Certified in compliance with EN 1154… CT500 door closerCT500 door closer. Closing force size 2/3.