Long into the disc steam trap 

 http://www.lonzvalve.com/Products.asp?PageNo=14 
 Disc steam trap is based on Bernoulli's principle of thermal power, steam and condensate using the different thermodynamic properties, kinetic and potential movement caused by pressure changes. The valve moves up and down the pieces of pressure changes, start valve open and close, so as to achieve the purpose of blocking gas drainage. 
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 Series: American Standard Valve Series http://www.lonzvalve.com/Product.asp?CateID=3