Flowserve BGM User Manual

Installation

Instructions

BGM Dura Seal

The Flowserve BGM
the same time, it keeps contamination out of the bearing frame. The BGM
of two major components: a stator assembly and a rotor assembly. The seals work in
conjunction with a "bull's-eye" sight gauge to completely isolate the bearing frame from
harmful contamination.

Temperature changes in the bearing housing will result in pressure fluctuations. Conventional
"constant level" oilers are not recommended. They are intolerant of such small pressure
changes.



Dura Seal

is designed to keep bearing lubricant in the bearing frame. At

Dura Seal

consists

Atmospheric Sealing of Bearing Frame

To isolate the bearing frame from environmental conditions such as high humidity, steam or
condensation, the following steps must be taken before seal assembly.

1. Remove bearing housing vents. They are a path for contamination.

2. Plug each vent.

Stator Installation Figure 1

3. Remove the "constant level" oiler

and replace it with a "bulls eye"
sight gauge. See Figure 1.

A minimum 3/8" - 18 NPT tapped
hole must be provided to
accommodate the sight gauge.

4. When applying on equipment
using oil mist lubrication, provisions
must be made to allow oil mist flow
through the bearing housing.

Experience In Motion

Plug Vent

BGM

Dura Seal

Remove

"Constant Level"

"Bulls Eye"

Sight Gauge

Oiler

Stator Assembly Installation

The stator assembly, consisting of the stator and the stator mounting ring, can be installed
using either an arbor press or the appropriate BGM installation tool.

1. Remove the oil seals or other bearing protection devices.

2. Break the sharp edges of the housing bores using a file, emery cloth, etc. 0.005" R
minimum to 0.030 R maximum)

3. Apply a light film of silicon lubricant to the outer diameter of the stator mounting
O-ring.

4. Install the stator assembly in the housing bore. If you are using an arbor press, use a
protective shield such as cardboard, rubber, etc. protect the entire stator sealing
surface. If you are using the BGM installation tool, tap the outer end of the tool with a
hammer until the stator enters the housing bore, Figure 2. Protective shields are not
necessary when using the installation tool.

5. Do not press the stator flange hard against the bearing housing. Leave about a

0.020" gap between that stator flange and the housing. Use this gap for final FIM
(Full Indicator Movement) adjustments, if needed.

6. The stator must be square to the shaft within 0.005" FIM for proper seal perfor-
mance. If you are using the BGM Installation tool, the stator will be automatically set
within 0.005" FIM and no further adjustments are needed. If you are using an arbor
press, mount a dial indicator on the shaft and set the indicator on the stator face.
Rotate the shaft and read the dial indicator. Adjust the stator so the difference between
the maximum and minimum readings is less than 0.005".

Stator Installation Figure 2

Stator

Installation

Tool

Hammer

Shaft

2