BOP Rams or simply Ram BOP is one of the types of BOP, also known as an associated object of a Blowout Preventer that is generally mounted on the top of a BOP stack. The modus of operandi for a Ram BOP is very much similar to how a gate valve works with only difference that a Ram BOP uses Rams which are usually the pair of opposing steel plungers. These steel plungers are rubber faced that come together with great force and seals the wellbore to control the back pressure kicks.
The primary purpose for this type of BOP is to prevent the well blowout. This object restricts the flow of fluid by extending it towards the centre of the wellbore and when the situation of back pressure kick arises, the rubber faced steel plungers retract outwards thereby opening the passage to circulate extra fluid through the outlet port.