A ball valve is a shut-off valve controlling the flow of liquids or gases by means of a rotating ball with either a full-port or reduced port bore.
Gate valves are used to shut off liquid flow in the fully closed position and provide full flow in the fully open position using a barrier (gate).
A butterfly valve is a valve that isolates or regulates the flow of a liquid.
Thermal Relief Valve
Thermal relief valves (also known as Pressure Relief valves) relieves the over-pressure of a liquid or gas in a piping or filter vessel system due to thermal expansion (temperature rises).