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Ammonia / Urea Plant

Ammonia / Urea Plant

In the Middle English language (1375/ 1425)¬† the technicians restarted to use this word to identify the Latin ‚Äúammoniacum‚Ä̬† and Greek ‚Äúammoniak√≥n‚Ä̬† applied to a salt and a gum resin prepared near the Shrine of Ammon in Libyado.

Ammonia synthesis

Ammonia is synthesised from hydrogen (from natural gas) and nitrogen (from the air). Natural gas contains some sulfurous compounds which damage the catalysts used in this process. 

Urea synthesis

Urea is made from ammonia and carbon dioxide. The ammonia and carbon dioxide are fed into the reactor at high pressure and temperature and the urea is formed in a two step reaction. The urea solution is then concentrated to give 99.6% w/w molten urea, and granulated for  use as fertiliser and chemical feedstock. 

The ammonia and urea complex is operated in accordance with stringent safety and environmental standards. The Petrochem complex produces effluent in the form of storm water  and waste water from the manufacturing process. All PARCOL INTERNATIONAL  control valves have the highest level of reliability and therefore were shots often seen in all the major plants in the world.

PARCOL has started the production of specialty control valves for urea plants in 1965; at present, approximately 200 production units where Parcol valves are installed run with full satisfaction. Our Special Globe and Butterfly Control valves are designed and manufactured so as to grant good service and longer trouble free life with very reduced maintenance.
Materials are adequate for urea and carbamate fluids and comply with the material specifications for this service of main Licensors such as Snamprogetti,Stamicarbon, Urea Casale and others.
Connections are obtained directly on the single piece that constitutes the valve body in order to keep down the weight, whereas the shape of internals does not leave dead zones. In fact dead zones are a cause for corrosion since carbamate strengthens its corrosive action particularly in these zones due to the failure of oxygen protection (passivation). 
Valves can be supplied with various types of actuators according to the required thrusts to guarantee smooth, long lasting and reliable operation, according tospecified working conditions and service. The most used actuators are Parcol pneumatic series (linear and/or rotary) with carbon steel yoke and side or top mounted handwheel. 


  • Technologically advanced and compact design.
  • Proven experience on a large number of applications all over the world.
  • Increased plant production due to high reliable valve performance and longer MTTM (Mean Time To Maintenance).
  • Lowest overall costs due to easy maintenance, quick change trim, no screwed or welded seats; long trim life; Improved resistance to corrosion and due to the absence of dead zones.
  • Customized valve design to fit our valves in existing piping.
  • Reduced leakage and system costs


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