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 be affected by outside damage, all parts of the PRV are embedded in the tank. This way it is exposed to 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 transportation purposes.
Semi internal pressure relief valves on the other hand are mostly used for tanks which store LPG & NH3. As these tanks are fixed and do not have a risk of rolling over, semi internal PRVs are the most suitable solution for them.