HIGH END INDUSTRIAL DOOR CLOSER
*To order models with Delayed Action, suffix DA to closer. EX. D-4550DA / D-4550DA UNIV. / D-4550TDA
CLOSING POWER ADJUSTMENT
Spring Power adjustable according to door weight and width, 2 through 7. Refer to installation instructions. Factory preset size 3 standard installation.
LATCHING POWER ADJUSTMENT
By changing the position of the frame arm on the foot bracket closing force at the latch can be increased or decreased.This can be achieved with the foot bracket in position.
LOW OPENING RESISTANCE/HIGHER EFFICIENCY
A precise production for every components based on Ryobi's original qualitiy control system realized higher efficiency of almost 80% at the average of all ranges and decreased opening resistance to the lowest for eldery and handicapped persons.
D-4550 Series Door Closers can be used on both RH and LH doors
for both push side and pull side mountings.
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.
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.
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.
ALL SEASON FLUID
All season fluid eliminates the need for seasonal adjustment.
PERIODIC HOLD OPEN
None required other than to check security of fixings on a regular basis.
The non handed, optional hold open arm allows the door to be held
open at any angles between 70 and 180 degrees.
VARIOUS OPTIONAL ACCESSORIES
Following accessories are available as option.
D-4550 Door Closers are available in SILVER, DARK-BRONZE, METALIC LEMON GOLD, BLACK, and WHITE finishes. SILVER may be available.