- Air inlet and outlet controls
- Body: PVC, PP or PVDF
- From DN 10 up to DN 80
- BV 91 free ball valve, for tank ventilation
- BV 95 ball valve, spring assistance, for tank ventilation & vacuum breaking
| Body: | PVC, PP or PVDF |
| Operating temperature: | PVC: 0 to +60 °C PP: -10 to +80 °C PVDF: -20 to +100 °C |
| Seals: | FPM |
| Ball: | PP for PVC & PP valves PVDF for PVDF valves |
| Spring: | Steel with PE coating (model BV 95) |
| Fittings: | Spigot ends (PVC: for solvent welding; PP & PVDF for fusion welding) |
BAMO BV91 and BV95 vent valves are designed for protection against vacuum, overpressure and overflow spillage.
- Overpressure protection (BV 91 & BV 95):
As the liquid fills the tank, the air or gas is compressed and pushes up the ball for exhaust. The tank is protected against overpressure while remaining watertight once the overpressure is evacuated. - Protection against vacuum, overflow-spillage (BV 95):
When emptying a tank, the space occupied by the liquid creates a vacuum. As the atmospheric pressure is higher, this creates a phenomenon of air suction through the ventilation valve. This assembly can also protect the tank from overflow spillage. - Protection against vacuum, overpressure, overflow-spillage (BV 91):
The ventilation valve BV 91 lets air or gas flow in both directions protecting the tank against vacuum and overpressure. An excessive filling of the tank by the liquid will apply the ball on its seat thus avoiding an overflow spillage.
Warning: The opening pressure of these BV 95 cannot be exactly stated, the spring has a plastic coat so, its features are not constant. The opening pressure value could be between 0.04 and 0.13 bar, it depends of the valve size. However, these values are for information only, they depend of operating conditions