1. What is the difference between a Grade 1 and a Grade 2 door closer?

The primary difference is durability and cycle life. A Grade 1 closer is tested for 2,000,000 cycles and is designed for high-traffic public buildings (schools, hospitals). A Grade 2 closer is tested for 1,000,000 cycles and is suitable for medium-traffic areas like interior office doors.

2. Why is my door closer leaking oil?

Oil leakage usually indicates that the internal seals have failed, often due to age, extreme weather , or improper installation (incorrect arm geometry). Since door closers are sealed hydraulic units, they cannot be repaired. A leaking closer must be replaced immediately to avoid losing control of the door's closing speed.

3. Can I use a regular door closer on a fire door?

No. You must use a closer that is UL Listed and fire-rated. Furthermore, you cannot use a "Hold-Open" arm on a fire door, as fire codes require these doors to be self-closing and self-latching at all times to prevent the spread of smoke and flames.

4. How do I adjust a door that slams too hard?

To stop a door from slamming, locate the "L" (Latch Speed) valve on the closer body. Using a screwdriver or hex key, turn the valve clockwise in small 1/8-turn increments. This increases the hydraulic resistance during the final 10–15 degrees of closing.

5. What does the "Backcheck" valve do?

The Backcheck (BC) valve provides resistance when the door is opened with excessive force (e.g., by a strong gust of wind). It prevents the door from swinging open too fast and damaging the wall, the frame, or the closer arm itself.

Commercial door closer

Door-Closer.Pro provides professional-grade DRIWON door closers, including heavy duty and extra heavy duty models. Built for reliability and long-lasting performance, our products keep your commercial doors operating smoothly and safely.

Payments methods:

Product on sale

Commercial Extra Heavy Duty Hydraulic Door Closer – Black Matte – Cast Iron Body, Steel Arm, Powder-Coated Finish

Original price was: $199.99.Current price is: $169.99.
Product on sale

Commercial Extra Heavy Duty Hydraulic Door Closer – Silver – Cast Iron Body, Steel Arm, Powder-Coated Finish

Original price was: $199.99.Current price is: $169.99.
Product on sale

Heavy Duty Commercial Door Closer – Black Matte – Supports door weights from 44–440 lbs and door widths from 23″–59″

Original price was: $159.99.Current price is: $139.99.
Product on sale

Heavy Duty Commercial Door Closer – Silver – Supports door weights from 44–440 lbs and door widths from 23″–59″

Original price was: $159.99.Current price is: $139.99.

Door-Closer.Pro

Commercial door closer

Price

Color

Size

Commercial Extra Heavy Duty Hydraulic Door Closer – Black Matte – Cast Iron Body, Steel Arm, Powder-Coated Finish

Commercial Extra Heavy Duty Hydraulic Door Closer – Silver – Cast Iron Body, Steel Arm, Powder-Coated Finish

Heavy Duty Commercial Door Closer – Black Matte – Supports door weights from 44–440 lbs and door widths from 23″–59″

Heavy Duty Commercial Door Closer – Silver – Supports door weights from 44–440 lbs and door widths from 23″–59″

Trusted by Professionals & Homeowners

Why Choose Driwon Products?

Payments methods