Home > Door Closers > Door Closer Help Center > Door Closer Applications > Hydraulic Door Closers

Hydraulic Door Hinge Arm Closers

Automatic Door and Hardware supplies high quality hydraulic door closers for building owners, contractors, and the door trade. We manufacture heavy duty hydraulic door closers with non-fatigue gear shafts, pistons, and smooth hydraulic fluid. We use special durable hydraulic fluid seals to prevent fluid from leaking out of the door closer body. Order hydraulic door closers today and receive FREE shipping!
Sort By:
Page of 1
Commando Hydraulic Door Closer Commando Hydraulic Door Closer Usually Ships in 24 Hours
List Price: $251.64
Your Price At Checkout: $125.82
Savings: $125.82
   
 

What Is A Hydraulic Door Closer

A hydraulic door closer is a type of mechanical door closing mechanism with hydraulic fluid commonly used on commercial doors. The door closer housing is typically manufactured from aluminum or cast iron and is known as the door closer body. The body of the hydraulic door closer houses a gear shaft, rack gear piston, and spring. The gear shaft sits in the door closer perpendicular on top of the rack gear piston. At the bottom of the gear shaft is the arm spindle which extends out of the door closer body. The door closer arm attaches to the door and the door closer spindle. As the door is pushed open by a pedestrian, the arm spindle rotates, causing the gear shaft to rotate, which then causes the rack gear and piston to move laterally. On the other side of the rack gear piston is the closing spring. As the rack gear piston moves laterally it compresses the spring. As the pedestrian exits the door way, the closing spring decompresses, there by closing the door.

How Do Hydraulics Work In A Door Closer

Within a door closer body is special hydraulic fluid. Lower grade door closers use inexpensive oil, resulting in the door closer leaking and not lasting very long. Higher quality door closers will utilize high end hydraulic fluid design for a wide range of operating temperatures. We understand that the internal spring of the door closer causes the door to close. However, it is the use of the hydraulics that controls the door from closing smoothly and safely. Without hydraulics, the door would just slam closed. Hydraulics work on the basic physics principle that liquid cannot be compressed. Within the door closer body, hydraulic fluid is filled on both sides of the rack gear piston. The hydraulic fluid is filled into these "chambers" with no air. As the rack gear piston moves laterally, the hydraulic fluid is pushed from one side of the rack gear to the other. Since the fluid cannot be compressed it has to travel to the other side of the rack gear piston. The hydraulic fluid passes through small channels etched into the door closer body. These two channels have a valve or adjustment screw that can be accessed from the exterior side of the door closer body. The valve screw controls the size of the channel at which the hydraulic fluid passes through, there by regulating the speed of the hydraulic door closer.

How Do You Stop A Hydraulic Door Closer From Slamming

When a hydraulic door closer is slamming, two scenarios could be occuring. The first scenario is the ideal case, that the adjustment latch speed valve is just not adjusted properly. The latch speed valve controls the speed of the door closing from 15 degrees open to the full closed position. An improperly adjusted latch speed that is too fast, can cause the door to slam closed from the 15 degree open position to the full closed position. If this is the case, simply adjusting the latch speed will solve the issue. The second scenario that could be happening is that the door closer is leaking and has lost hydraulic fluid. This is the worse case scenario since the door closer is no longer usable and should be recycled. A new door closer will need to be purchased. When a door closer leaks it is generally caused by a bad seal or by someone who has unscrewed one of the speed adjustment valves too far, causing the hydraulic fluid to leak out. Once the door closer begins leaking fluid it is no longer safe, since air will eventually enter the closer body, and the door closer is no longer properly pressurized. Unfortunately, if the closing speed adjustment screw has been unscrewed too far, you cannot just add hydraulic fluid, since the closer body cannot have any air inside of the chambers and must be pressurized. The only solution would be to replace the hydraulic door closer with a new one.

Is A Hydraulic Door Closer A Damper?

Essentially yes. A hydraulic door closer is a type of door damper, because it dampens or reduces the speed at which door closers. In the early days, the door closer was invented because the wind would catch doors and swing them open violently. The doors would swing open so fast that the doors would tear off of the hinges. The solution was the hydraulic door closer because it held the door closed against the wind and when the door was opened the door closer arm would keep the door attached to the hinges.

Are All Door Closers Hydraulic?

No not all door closers are hydraulic. The majority of commercial door closers are hydraulic. However, doors such as storm doors and screen doors often use a mechanical spring type door closer. Some screen doors use pneumatic door closers designed to dampen the door from closing using air.

Hydraulic Door Hinge & Hydraulic Arm

The term hydraulic door hinge or hydraulic arm are often used as descriptions for the entire hydraulic door closer mechanism.

Is A Hydraulic Door Closer Better Than Pneumatic

The short answer is it depends on the door type. Hydraulic door closers are better door closer types for commercial door applications such as wood doors, steel and metal doors, and storefront glass doors. Hydraulic door closers are more versatile since they can be used on light to heavy door applications. Also hydraulic door closers are very durable and can be used on door applications that get alot of abuse such as hospital doors or school doors. Pneumatic door closers are better on screen and storm doors. Pneumatic door closers are smaller in design and foot print and can be installed at the bottom of a screen door. Pneumatic door closers don't have as much adjustments and features as hydraulic door closers, however that is not generally needed on screen doors.

How Long Does A Hydraulic Door Closer Last

High quality Grade 1 hydraulic door closers can last a life time. With that being said, lower quality hydraulic door closer models that are grade 2 or 3 will not last as long. It really depends on the quality of the door closer and the brand. As an example, we only offer our Commando Grade 1 door closer because it is a trusted brand name and is known to last in all commercial door applications. Another factor that affects the hydraulic door closer longevity is the quality of the seals. Lower quality hydraulic door closers are notorious for cutting corners by using inferior valve seals. This is why you commonly see door closers leaking hydraulic fluid.