1. With Electrical Grounding
Bearing Gard TM
With Electrical Grounding

2. Why use a Bearing Gard with Electrical Grounding?
Extend electric motor life and improve reliability
Electric motors driven with Variable Frequency Drives (VFDs) have two main failure modes: bearing contamination and bearing damage from electrical discharge machining (EDM) commonly known as electrical fluting
The Bearing Gard with electrical grounding provides excellent protection against these two failure modes:
The Bearing Gard provides protection against contamination ingress
Flowserve has partnered with the Industry leader in shaft voltage grounding, AEGIS®, to provide the AEGIS SGR to protect against EMD
Combined into one easy to install package, the Bearing Gard with electrical grounding is the best way to protect motors using VFDs

3. Bearing Gard with Electrical Grounding
Two great technologies in one simple package
Full-featured Bearing Gard
AEGIS®
Grounding Ring

4. Electrical Grounding How it Works

5. PWM Voltage to Motors – A Problem for Bearings
Unbalanced voltage condition
When operated by VFD, the power to the motor is a series of positive and negative pulses instead of a smooth sine wave.
The input voltage is never balanced because the voltage is either 0 volts, positive, or negative with rapid switching between pulses in all three phases.
Bearing protection needed to mitigate electrical discharge machining (EDM) damage in bearings caused by the unbalanced voltage.

6. Prevent EDM with AEGIS®
Electrical discharge machining (EDM) creates thousands of pits
Bearings degrade, resulting in increased friction and noise
Eventually, the rolling elements can cause fluting damage to the bearing races
Bearing lubrication/grease deteriorates/burnt
Potential for costly unplanned downtime

7. Patented AEGIS® Ring design
Specially Designed Microfibers Flex Without Breaking – Ultra Low Friction
Patented FiberLock™ Channel Secures and Protects Fibers
AEGIS® Ring discharges harmful shaft voltages away from the bearing to ground

8. When Destructive Shaft Voltages are Present
SHAFT VOLTAGE READING
WITHOUT AEGIS® :
SHAFT VOLTAGE READING WITH AEGIS®:
PROBLEM
SOLUTION

9. AEGIS® Award Winning Technology

10. Bearing Gard with electrical grounding
Validation testing measured shaft voltage with and without grounding
Bearing Gard with AEGIS® grounding ring

11. Bearing Gard with electrical grounding
Validation testing measured shaft voltage with and without grounding
Bearing Gard with AEGIS® grounding ring

12. Bearing Gard with electrical grounding
Validation testing showed 98% drop in shaft voltage
Voltage without Bearing Gard with electrical grounding
Voltage with Bearing Gard with electrical grounding

13. Bearing Gard Key Features
Contamination exclusion
Oversized OD drain channel
Protected rotor/stator interface
Large collection area
Superior drain design

14. Bearing Gard Key Features
Unitization with axial runout
Improved unitization feature
Prevents shut-off O-ring binding
Axial runout up to 0.63 mm (0.025 in)
Exceeds competition’s standard axial runout of 0.13 mm (0.005 in)

15. Bearing Gard Key Features
Innovative shut-off design
Improved static sealing
Tapered shoulder creates positive side wall sealing at all times
Dynamically lifts off to prevent wear at operational speed
Increased reliability by preventing O-ring binding
RPM

16. Bearing Gard Key Features
Unique double drive ring
Standard version only (not slimline)
Superior shaft grip
Improved rotor stability
Compact size

17. Bearing Gard with electrical grounding
Two cross-sections for easy application
Standard version maximizes performance and reliability for contamination exclusion, current carrying capacity and surface contact area
Slimline version provides protection for light duty and space constricted applications

18. Bearing Gard with electrical grounding
Smart part code for quick and easy ordering
BGEXXXXYYYYSDBV
BGEXXXXYYYYTNBV

19. Bearing Gard with electrical grounding
Smart part code for quick and easy ordering
BGEXXXXYYYYSDBV
BG – Bearing Gard
E - Electrical grounding
XXXX – shaft dimension
2.000 inch shaft – 2000
40 mm shaft – M040
mm in even increments only
Convert fractional mm to inch
YYYY – bore dimension
SD – standard design / TN – slimline design
B – Bronze
V – FKM O-rings

20. Bearing Gard with electrical grounding
Lead-time information
Shaft diameters: 23 – 152 mm (.875 – inch)
Housing bore: mm (.750 – inch) over shaft size
Standard or slimline length
O-ring: FKM
Rotor and Stator: Bronze
Non-stock Aegis ring - Custom shaft and housing dimensions
Ship 2 days after receipt of order
Shaft size with stocked Aegis ring – Custom housing dimension
Same day shipment
Orders completed before 3 pm
Must ship FedEx

21. Bearing Gard with electrical grounding
Stocking information
There are no standard sizes for the sealing area of electric motors
AEGIS® rings can be stocked by shaft size for different bore sizes
Inform the product manager if you would like a size stocked for quick delivery
Typical sealing area for electric motor. Note: first installation may require housing to be bored to fit Bearing Gard.

22. Support materials Available from your local Flowserve representative
Dimensional information sheet (standard Bearing Gard FTA 204)
Product brochure
Installation instructions (standard Bearing Gard FIS223)

23. Bearing Gard with electrical grounding
Your local Flowserve Representative is your partner to:
Confirm part numbers
Confirm pricing
Confirm availability
Request stocked sizes
Request engineered solutions