Air Supply System - Danfoss Airflex DBBS Installation, Operation And Maintenance Manual

DBBS Brakes
TABLE 4
Fastener Description and Assembly Torque, lubed, ft.-lb. (Nm)
Item No. & Description
18
Self Locking Nut
20
Hex Head Screw
Mounting Screw*
* The 325DBBS and the 425DBBS require larger mounting screws. The mounting screw required for both sizes is a 3/4"-10NC-2. Tightening torque is 280 lb-ft (380 Nm) lubed.
2.2.6 While supporting the brake, connect an air supply
and apply enough pressure to release the brake.
Attach the mounting flange (2) to the brake mounting
surface using the appropriate fasteners. Torque the
fasteners to the specified value. See Table 4.
Note
Mounting holes in the 325DBBS and 425DBBS
brakes are larger than the 125DBBS and 225DBBS
sizes. Be sure to use the correct size fasteners.
Danger
Use only the proper number and grade fasteners
shown in Table 4. Use of commercial grade fasteners
where Grade 8 fasteners are specified may result
in failure of the fasteners and a sudden and drastic
reduction in brake torque.
2.3

Air Supply System

Warning
Maximum allowable air pressure is 120 psig (8.2 bar)
for sizes 20DBBS, 25DBBS and 38DBBS. Maximum
allowable air pressure is 150 psig (10.3 bar) for
the 50DBBS. Application of pressure exceeding
maximum allowable may result in damage to the
brake components.
2.3.1 Cylinder port size is 1/2"-14 NPT for sizes 20 and
25DBBS brakes, 3/4"-14 NPT for size 38DBBS
brakes and 1"-11-1/2 NPT for size 50DBBS brakes.
2.3.2 Since the air control arrangement will vary from one
application to the next, a specific description cannot
be presented here. Following are some general
guidelines for installing the air control components.
8 Airflex DBB 8110 Brake Assembly
®
Specification 20DBBS
Size 3/4-10NC-3
Torque 150 (203)
Size 3/4 - 10NC-2
Gr. 8
Torque 150 (203)
Size 5/8 - 11NC-2
Gr. 8
Torque 170 (230)
E-CLCL-TT001-E
25DBBS*
1-1/8 7NC-3
500 (6 77)
1-1/8 - 7NC-2
Gr. 8
500 (6 77)
5/8 - 11NC-2
Gr. 8
170 (230)
2.3.2.1 Use full size piping consistent with the control valve
size. All piping should be free of metal chips, cutting
compound, and any other foreign matter. Pipe ends
should be reamed after cutting to eliminate possible
restrictions.
2.3.2.2 Keep the number of elbows to a minimum to ensure
consistent response.
2.3.2.3 Spool type solenoid valves are not recommended.
Use poppet type valves and locate them as close as
possible to the brake.
Warning
If the DBBS brake is being used on a mechanical
power press, special valving may be required.
2.3.2.4 If the DBBS is being used on a cyclic application,
an air receiver tank should be installed in the air
supply line and isolated (check valve) from other air
consuming equipment.
2.3.2.5 The final connection to the brake inlet ports must be
made with flexible hose.
2.3.2.6 The DBBS brake does not require lubricated air;
however the solenoid valve may. Consult the valve
manufacturer.
2.3.2. 7 A pressure switch should be located in the air supply
line to the brake and interlocked with the equipment
electrical controls.
Caution
Before modifying air supply lines, adding inline
components or adding pressure switch interlocks,
ensure brake will function in a safe manner.
December 2012
38DBBS 50DBBS
1-3/8 - 6NC3 1-3/8 - 6NC3
750 (1015) 750 (1015)
1-3/8 - 6NC-2 1-3/8 - 6NC-2
Gr. 8 Gr. 8
750 (1015) 750 (1015)
1-8 NC-2 1-3/8 - 6NC-2
Gr. 8 Gr. 8
680 (920) 1780 (2409)