Now the energy-saving performance and reliability of inverted bucket steam traps are available in a versatile new package. The TVS 800 Series Trap Valve Station from Armstrong offers all the familiar benefits, and the same efficient condensate drainage from virtually every kind of steam-using equipment. But what's new are all the benefits of a piston valve integrated into one compact trap/valve casting, and the benefits are extended into installation, trap testing and maintenance. Armstrong International.