Niterra offers three different types of EGR valves – ‘pneumatic’, ‘electric’ and ‘electric with cooler’. Pneumatic EGR valves have a vacuum-controlled diaphragm. Electric EGR valves are controlled through integrated electronics. These valves are run directly by the engine’s control unit and can be much more precisely regulated. And then there are electric EGR valves that have a cooling unit to further reduce the temperature of the exhaust gases.