Ammonia is an important raw material for the manufacture of nitric acid, ammonium salt and amine. Ammonia is a gas at room temperature and can be liquefied under pressure. Most metals such as Stainless steel, Aluminum, Lead, Magnesium, Titanium, etc. have excellent corrosion resistance to ammonia gas, liquid ammonia and ammonia water. Cast iron and carbon steel also have good corrosion resistance to ammonia gas or liquid ammonia, the corrosion rate is generally less than 0.1mm/year, so ammonia production and storage equipment is generally made of steel from the perspective of cost.

The customized ammonia ball valve can be used in ammonia and liquid ammonia piping system. Ammonia ball valve is generally painted yellow to distinguish it from valves for other applications. 

what are the characteristics of ammonia ball valve for ammonia application?

• Copper reacts with ammonia gas and ammonia water to form soluble complexes and produce dangerous stress corrosion cracking. In the ammonia-environment, even trace amounts of ammonia can cause stress corrosion in the atmosphere. Valves made of copper and copper alloy are generally not suitable for ammonia applications.
• Ammonia ball valve sealing surface is mostly Babbitt alloy and the ball valve body is made of stainless steel CF8 or high-quality carbon steel WCB to be used to the maximum requirements, can be resistant to ammonia corrosion, low-temperature resistance to -40℃.
• The tongue and groove face design of flange connection ensures reliable sealing performance even when pipeline pressure fluctuates.
• Multi-layer PTFE (PTFE) or Babbitt alloy sealing material and a composite soft packing made of PTFE+ butanol + spring) ensure that the valve packing box is free of leakage during the service life.
• PTFE plain gaskets, stainless steel + graphite wound gaskets, stainless steel + PTFE wound gaskets are also recommended for ammonia valves.