Door Closers
ENGINEERING EXCELLENCE AS STANDARD
When you choose a Ryobi closer you are guaranteed a product of high quality. Produced to exacting standards in closer design and technology, each component is a masterpiece of precision engineering.
THE TECHNOLOGY BEHIND RYOBI DOOR CLOSERS
Ryobi is one of the world’s largest manufacturers of Aluminum die-castings. Producing products extensively for the automotive industry, such as cylinder blocks and precision die-cast components, Ryobi fully integrated production systems are synonymous with World class manufacturing. Capitalizing on its advanced die-casting technology, Ryobi’s D-4550, D-3550 series Door Closers and Concealed door closers utilize R14 high silicon Aluminum alloy, a high specification alloy developed for the automotive industry, whose exacting standards of quality and durability are encompassed in the Ryobi Door Closer range.
Ryobi… Quality second to none
Closing Power Adjustment
Closing power is adjustable according to door weight and width by adjusting the spring power. To increase closing power, turn spring adjusting nut clockwise. To decrease closing power, turn spring adjusting nut counterclockwise. This closing power adjustment function is equipped with D-4550, D-3550 and D-2550 series door closers.
Full Hydraulic Control
Controls the door through the entire opening and closing cycles by providing adjustable backcheck upon opening and adjustable general and latch speed through the closing cycle. A separate hydraulic valve allows adjustment to delay the closing speed from 180 to 70 degrees of door opening range.
*This illustration shows the position of each valve for D-3550DA.
Adjustable Backcheck
A backcheck feature set and adjusted by an independent valve. When introduced the backcheck stalls the opening of the door around 70 degrees. When doors are violently opened by pedestrians or wind, the backcheck feature reduces the likelihood of damage should contact be made with an adjacent wall or obstacle. For busy doors in public building, schools and colleges this facility protects people and property.
This backcheck function is equipped with 8800, 7000 and D-1550 series as option, and with D-2550, D-3550 and D-4550 as standard.
Optional Delayed Action
An optional delayed action feature adjusted by means of an independent valve. Once set , the door – when opened beyond 70 degrees enters into a delayed mode allowing additional time before the closing. Delayed time can be adjusted to vary from seconds to minutes depending on the angle to which the door is opened. Delayed Closing Action is an advantage to : Nursing staff assisting patients, Domestic staff pushing meals or maintenance trolleys, and the elderly or infirm walking with sticks or frames under supervision.
This delayed action function is equipped with D-3550 and D-4550 series as option.
