Vacuum pump protection from liquid contamination
Combining a tubular sight glass with a floating ball check valve, the BFSG is constructed from a heavy duty borosilicate glass with its superior corrosion and thermal performance.
Two PTFE seats are incorporated inside the BFSG (the lower one castellated and the upper one with a Chemraz® o-ring seal) with a hollow PTFE floating ball trapped between them. The glass is tube held securely between two PFA lined carbon steel flanges.
These sight glass / non-return valves are used to safeguard vacuum pumps from failure caused through liquid being drawn into them. Under normal operation the gasses pass up past the ball and through the sight glass into the vacuum pump.
In any event where something goes wrong with the process and liquid enters into the vacuum line, the sight glass fills with this and the ball floats up to the seat preventing the liquid from passing and damaging the pump.
The pump is protected and the sight glass gives clear visual indication of the presence of liquid in the line.
To Suit ASME 150 and Din PN10/16 Flanged Piping Systems
| Dimensions | ||||||
|---|---|---|---|---|---|---|
| To Suit Pipework | Face – Face | Flange ø | Raised Face ø | Weight | Glass | |
| ASME 150 Piping System | ||||||
| Inches | Dim. A Inches | Dim. B Inches | Dim. C Inches | Pounds | ø Inches | Wall Inches |
| 1 | 6.0 | 4.3 | 2.0 | 8.4 | 1.2 | 0.2 |
| 1 1/2 | 7.0 | 4.9 | 2.9 | 11.5 | 2.0 | 0.3 |
| 2 | 8.0 | 5.9 | 3.6 | 17.0 | 2.4 | 0.4 |
| 3 | 9.5 | 7.5 | 5.0 | 29.8 | 3.5 | 0.4 |
| 4 | 11.5 | 9.1 | 6.2 | 41.4 | 4.7 | 0.4 |
| DIN PN 10/16 Piping System | ||||||
| Inches | Dim. A Inches | Dim. B Inches | Dim. C Inches | Pounds | ø Inches | Wall Inches |
| 1.0 | 6.3 | 4.5 | 2.7 | 8.8 | 1.2 | 0.2 |
| 1 1/2 | 7.9 | 5.9 | 3.5 | 12.3 | 2.0 | 0.3 |
| 2.0 | 9.1 | 6.5 | 4.0 | 18.7 | 2.4 | 0.4 |
| 3.0 | 12.2 | 7.9 | 5.4 | 27.1 | 3.5 | 0.4 |
| 4 | 13.8 | 8.7 | 6.4 | 41.4 | 4.7 | 0.4 |
The BFSG tie rods can be adjusted without removing from the pipeline, all wetted parts are PTFE, PFA and Borosilicate Glass.
