There are various types of power generation plant, running on both fossil and renewable fuels, whose ultimate purpose is to generate electricity through steam turbines.

The water-steam cycle in power generation plants requires efficient steam control in different stop and start situations, as well as under variable pressure and temperature conditions.

The main blocks are the condensate system, the boiler drum feedwater and the main steam to the turbines and, in all of them, we need control valves capable of handling high differential pressures, high temperatures and severe service conditions.

COMEVAL VALVE SYSTEMS is a company specialising in the complete supply of valves and equipment for fluid control, with a full supply programme of on/off and control valves for managing all these variables.

Thanks to our close collaboration with the Italian company GREEN CONTROL, pioneers in the design and manufacture of control valves for general processes and severe service, we have a qualified programme to offer severe service control valves for the main applications, such as the condensate pump system, deaerators, boiler preheater and superheater, condenser and turbine bypass.

GREEN CONTROL valves are designed with special anti-cavitation and multi-stage trims to ensure optimum performance even under sharp pressure drops, and in cast and forged alloy materials for high temperatures and high pressure ratings.

These are control valves able to guarantee temperature and pressure conditions that ensure the required flow remains stable in the plant, available in straight, angle and three-way configurations to cover every possibility.

Steam desuperheaters are also produced, for conditioning superheated steam by means of atomising nozzles.

The manufacturing range includes control valves up to 2500# design pressure and temperatures above 500ºC, in sizes up to 24”. The valves are built in accordance with ASME and include the approvals required by current standards.

GREEN CONTROL brings extensive experience in managing engineering projects in the field of control valves and has a wide list of international references.

COMEVAL VALVE SYSTEMS is a company founded in 1975 and part of the international ARI ARMATUREN Group since 2011, with a complete portfolio of control valves, safety valves and vent silencers for power generation plants.