Model No: 165
LPG (Liquefied Petroleum Gas) and NH3 (ammonia) are the goods which might carry risks during transportation and storage. Vapor that occurs during storage and transportations should be controlled carefully. That can be done with special pressure relief valves which are specialized for these gases.
There are basically 2 types of LPG & NH3 PRV, fully internal and semi internal.
For fully internal, not to affect from the outside damage, all parts of the PRV is embedded into the tank. With this way it is exposed the pressure from inside directly and is not being affected from any outer intervention. When a vehicle is carrying LPG or NH3 and if there occurs any accident, fully internal PRV helps to keep the gas inside. It is mostly used for the transportation purposes.
On the other hand, semi internal pressure relief valves are used mostly for the tanks which store LPG & NH3. Cause of those tanks are fixed and do not have the risks of rolling over, semi internal PRVs are the most suitable solution for them.