Blue static box-film heat steam trap BNFLV21 

 http://www.langaovalve.com/productshow.asp?id=928 
 Product description: bellows steam trap main action components of metal bellows, expansion and contraction film box under the principle of open and close the valve. Widely used in steam pipe lines, heating lines, dryers and industrial equipment steam heating system, heating system on a chip is the best choice. 
 Features: 1, simple structure and easy maintenance. 
 2, used in all parts of stainless alloy processing, cavitation wear resistance, long service life. 
 3, emptying ability, rapid drainage, installation free. 
 4, can be a combination of multiple diaphragm, used in large displacement applications. 
 5, zero leakage, back-pressure rate of 75% or more. 
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 Series: Traps http://www.langaovalve.com/product.asp?softid=4