Why does there need to be a filling limit?
The liquid gas expands as it changes temperature and the vapour needs enough space at the top of the tank where it settles. Filling the tank at 80% allows for enough space for the expansion. This is also a safety feature. If there is not enough space in the tank it can be over pressured and create potentially dangerous conditions. For example, the safety relief valve may open or LPG, in liquid phase, could enter into the piping system.
Optional handle for manual shutoff
It’s also possible to add an optional handle to the valve. The result is an extended filler valve with ball shut-off valve manually operated, that allows the user to manually close the valve if necessary. The handle is another optional safety feature in addition to the OPD.
Improving again the safety aspect while improving the performance for the end user.
Filler Valve with OPD: Requirements
An OPD is a legally required overflow protection device for any propane tank manufactured after September 30 1998 in the United States.
As of January 1, 2003, cylinders without OPDs cannot be refilled.
1. Fabricated (manufactured) after September 30, 1998;
2. Requalified after September 30, 1998; or
3. Refilled on or after April 1, 2002.
In other parts of the World, these safety features are not mandatory but certainly prove to be popular regardless of requirements, considering the additional factor of safety that is added at every step. The added security benefits and peace of mind to every user is something that is invaluable.
The Applications of Filler Valves with OPD
Cavagna Group is producing thousands of pieces of these valves for many different applications such as:
•Autogas station under and above ground tanks
•ASME above ground
Over 20 years of production in 50 countries worldwide and over 1.000.000 pieces in operation. We can let the numbers speak for themselves with this confirmed level of safety.
For more information, contact your Cavagna Group Sales representative or firstname.lastname@example.org