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They use Hydraulic fluid that is pressurized by the opening of the door to control gears speed to allow for a steady closing of the door . Most have valve adjustments that increase or decrease the pressure to allow the door to speed up or slow down.

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14y ago

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What type of oil is used in door closers?

Door closers typically use hydraulic oil or a specialized lubricant designed for their mechanism. This oil helps to control the speed and force of the door's closing action, ensuring smooth and quiet operation. Some door closers may also use silicone-based lubricants for added performance in specific environments. It's essential to use the manufacturer's recommended oil to maintain the closer's functionality and longevity.


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Send it to Midlands floor springs Limited who specialise in the repair of door closers and floor springs.


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the terminology of door check and door closer are from long ago, in 1880's and 1890's door closers were just a spring device to pull the door shut but not really control the closing speed or force, door check, that was more of a hydraulic or pneumatic cylinder with a piston inside (think of a regular screen door closer, but without the spring) was used together with a door spring to create some controlled door closing, and prevention od door slamming. now, the term of door check is faded because after the rack and pinion hydraulic closer was invented, the dampening effect was added onto the device in the manufacturing process. hence now they are all referred to as door CLOSER. hope this helps, expert in closers here


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What is the thing called that makes a door in a building close by itself?

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