The Dorma BTS 75V is a highly versatile floor spring mechanism designed to provide reliable, controlled closing for a wide variety of door types. This unit is supplied as the mechanism only, housed in its cement box, and is intended as a replacement part or for use in new installations when combined with appropriate cover plates and accessories.
Its universal design makes it an ideal solution for many environments, as it is compatible with both single action (left-hand or right-hand) and double action doors. A key feature of the BTS 75V is the adjustable spring power, which can be fine-tuned in-situ using an adjustment screw. This allows the unit to be perfectly calibrated for doors weighing up to 120kg and with widths up to 1100mm.
Functionality is enhanced by integrated hydraulic backcheck, which protects the door and the building's fabric from damage if the door is thrown open with excessive force. It also features independent adjustment valves for closing speed and latching action, ensuring smooth operation throughout the entire closing cycle. Typical applications include heavy-traffic commercial entrances, retail spaces, and office partitions where a concealed, durable closing solution is required.
Note: This is the internal mechanism and cement box only. For a complete installation, matching cover plates, floor pivots, and top centres must be selected to suit the specific door material and application.
