External Retract Control Pneumatic Balancer Series
The external safety retract control is an adjustable safety feature that regulates the balancer’s speed of vertical travel. If a load is lost, the cable or chain will slowly retract into the balancer versus suddenly accelerating upward. The hydraulic shocks from the external retract control put resistance on the thrust bearing allowing for a slow and controlled retraction.
The external retract control balancer series are typically used:
- If the fixture that is attached to the balancer is a light hook picking up a heavy part.
- If a part has the tendency to get stuck in the dunnage.
In both these applications the retract will control the cable/chain from suddenly accelerating up.
When specifying a pneumatic balancer, it is recommended for working loads to use 80% of the operating capacity for lifting applications. This approach compensates for the normal fluctuations within the plant compressed air supply. Working loads include part weight and handling device weight. Balancers are rated at 100 psi [6.8bar] therefore use the following example to calculate exact operating capability.
Formula for pneumatic balancer sizing:
Example: plant air 60 psi, 350 air balancer, 80% load capability (0.60 air supply x 350 lbs. = 210 x .80 = 168 lbs. operating capability).
Single EX Cable Series Model Numbers:
KBA150-076-EX, KBA225-073-EX, KBA225-110-EX, KBA350-073-EX, KBA500-080-EX & KBA700-054-EX
Single EX Chain Series Model Numbers:
KBC150-070-EX, KBC200-110-EX, KBC225-067-EX, KBC350-067-EX, KBC500-080-EX & KBC700-052-EX
Dual (SDS) EX Chain Series Model Numbers:
KBC250S-054-EX, KBC500S-084-EX, KBC700S-052-EX
Reeved EX Cable Series Model Numbers:
RKBA450-036-EX, RKBA450-055-EX, RKBA700-036-EX, RKBA1000-040-EX & RKBA1400-027-EX
Reeved EX Chain Series Model Numbers:
RKBC400-055-EX, RKBC450-033-EX, RKBC700-033-EX, RKBC1000-040-EX & RKBC1400-026-EX
Tandem EX Cable Series Model Numbers:
TKBA700-073-EX, TKBA1000-080-EX & TKBA1400-052-EX
Tandem EX Chain Series Model Numbers:
TKBC700-067-EX, TKBC1000-080-EX & TKBC1400-052-EX
To see examples of custom Balancer applications designed by Knight, visit our Gallery.
Resources
Installation Guides
+
Air Balancer Trouble Shooting Guide (Netherlands)
Air Balancer Troubleshooting Guide-2017
Air Balancer Troubleshooting Guide-2021
Air Connection with Balancer Logic Box
Air Connection with Balancer Manifold
External Safety Retract Control Information
Eye Bolt Safety Cable Installation Instructions
Safety Cable Installation Instructions End Trucks, Hangers, Trolleys
General Information
+Features
- CE Compliant.
- Cable or Chain.
- Hands-Free Operation.
- Standard “Float” Mode.
- Internal Centrifugal Retract Control.
- Requires Non-Lubricated Clean/Dry Air.
- Max. Balancing Capacity: Up to 1400 lbs. [635kg].
- Standard Travel: Up to 110 in. [2794mm].
Note: Knight recommends the use of high performance, extreme pressure, anti-wear food grade penetrating oil (Lubriplate® 1241 Recommended) that penetrates and lubricates cable. For chain (SAE 50 to 90 EP oil or equivalent machine/gear oil) is Recommended.
Benefits/Options
- Optional Limit Switches.
- Optional High Relieving and Feathertouch Controls.
- Multiple Suspension Kits Available.
Single EX Series Specifications
+Single EX Cable Series Pneumatic Balancers
| Model Number | Rated Capacity lbs. [kg] | Maximum Travel in. [mm] |
|---|---|---|
| KBA150-076-EX | 150 lbs [68kg] | 76 in [1930mm] |
| KBA225-073-EX | 225 lbs [102kg] | 73 in [1854mm] |
| KBA225-110-EX | 225 lbs [102kg] | 110 in [2794mm] |
| KBA350-073-EX | 350 lbs [159kg] | 73 in [1854mm] |
| KBA500-080-EX | 500 lbs [227kg] | 80 in [2032mm] |
| KBA700-054-EX | 700 lbs [317kg] | 54 in [1371mm] |
Single EX Chain Series Pneumatic Balancers
| Model Number | Rated Capacity lbs. [kg] | Maximum Travel in. [mm] |
|---|---|---|
| KBC150-070-EX | 150 lbs [68kg] | 70 in [1778mm] |
| KBC200-110-EX | 200 lbs [91kg] | 110 in [2794mm] |
| KBC225-067-EX | 225 lbs [102kg] | 67 in [1701mm] |
| KBC350-067-EX | 350 lbs [159kg] | 67 in [1701mm] |
| KBC500-080-EX | 500 lbs [227kg] | 80 in [2032mm] |
| KBC700-052-EX | 700 lbs [317kg] | 52 in [1320mm] |
Dual Chain (SDS) EX Series Specifications
+Dual Chain (SDS) EX Series Specifications
| Model Number | Capacity lbs. [kg] | Mamimum Travel 0mm] |
|---|---|---|
| KBC250S-054-EX | 250 lbs. [113kg] | 54 in. [1371mm] |
| KBC500S-084-EX | 500 lbs. [226kg] | 84 in. [2133mm] |
| KBC700S-052-EX | 700 lbs. [317kg] | 52 in. [1321mm] |
Reeved EX Series Specifications
+Reeved EX Cable Series Pneumatic Balancers
| Model Number | Rated Capacity lbs. [kg] | Maximum Travel in. [mm] |
|---|---|---|
| RKBA450-036-EX | 450 lbs [204kg] | 36 in [914mm] |
| RKBA450-055-EX | 450 lbs [204kg] | 55 in [1397mm] |
| RKBA700-036-EX | 700 lbs [318kg] | 36 in [914mm] |
| RKBA1000-040-EX | 1000 lbs [454kg] | 40 in [1016mm] |
| RKBA1400-027-EX | 1400 lbs [635kg] | 27 in [685mm] |
Reeved EX Chain Series Pneumatic Balancers
| Model Number | Rated Capacity lbs. [kg] | Maximum Travel in. [mm] |
|---|---|---|
| RKBC400-055-EX | 450 lbs [204kg] | 55 in [1397mm] |
| RKBC450-033-EX | 450 lbs [204kg] | 33 in [818mm] |
| RKBC700-033-EX | 700 lbs [318kg] | 33 in [818mm] |
| RKBC1000-040-EX | 1000 lbs [454kg] | 40 in [1016mm] |
| RKBC1400-026-EX | 1400 lbs [635kg] | 27 in [685mm] |
Tandem EX Series Specifications
+Tandem EX Cable Series Pneumatic Balancers
| Model Number | Rated Capacity lbs. [kg] | Maximum Travel in. [mm] |
|---|---|---|
| TKBA700-073-EX | 700 lbs [318kg] | 73 in [1854mm] |
| TKBA1000-080-EX | 1000 lbs [454kg] | 80 in [2032mm] |
| TKBA1400-052-EX | 1400 lbs [635kg] | 54 in [1371mm] |
Tandem EX Chain Series Pneumatic Balancers
| Model Number | Rated Capacity lbs. [kg] | Maximum Travel in. [mm] |
|---|---|---|
| TKBC700-067-EX | 700 lbs [318kg] | 67 in [1701mm] |
| TKBC1000-080-EX | 1000 lbs [454kg] | 80 in [2032mm] |
| TKBC1400-052-EX | 1400 lbs [635kg] | 52 in [1320mm] |
Videos
+*Air Balancer – Setting Chain Length
*Applications Compilation
*BPA2113 Hook – Setting Pin into Chain Link
*Pneumatic Rotary Union for Air Balancers
*Standard Balancer VS. External Retract Balancer
Air Balancer Cable Hook Installation
Air Balancer Manifold & Control Handle Installation
Air Balancer Safety Cable Kit Installation
Air Balancer to Rail Installation
Air Balancer Trolley Installation
