Venting a tank truck compartment requires the highest precision and reliability. That's why you need Alfons Haar fittings!
Vapour transfer valve (vent valve PKV, PKVF), according to EN 13082 and ADR, ensures together with the pneumatic control, that the compartment is vented to the atmosphere before opening a foot valve (PBV). After closing a foot valve (PBV), the vapour transfer valve closes with delay so that there can never be over-pressure or a vacuum in the compartment.
The prescribed pressure and vacuum breather vent according to EN 14595 and ADR is integrated in the vapour transfer valve...
The vapour transfer valves are available with and without automatic sequence control in a nominal size of 65.
Flame arresters according to EN 12874
The flame arresters according to EN 12874 are mounted on the vapour transfer valve. This enables the vapour collection manifold to be connected as well as preventing flame transmission into the tank.
Depending on what is required, the flame arresters can be designed as end-of-line flame arrester (connection DN 75) or as a deflagration, detonation and endurance burning flame arrester (connection DN 50).
Please find here our brochures for more detailed information: