QCNRV Power Plant Abbreviation

Quick Closing Non-return Valve

Quick Closing Non-Return Valve (QCNRV) is basically a Non return valve, equipped with a power cylinder to close the valve quickly. This non return valve allows the fluid to flow in one direction only. These valves are used mainly in typical power plant application. The valve is installed in turbine extraction lines where in the back flow of wet steam to turbine is not allowed. In case of boiler trips, steam to turbine will be disconnected, at same instant the QCNR Valve is actuated by power cylinder and it closes the flap in 0.5seconds, thus preventing the reverse flow of wet steam to turbine which is detrimental to the turbine casing and rotor.