Abstract: Steam trap structure including a bi-metal strip for actuating valve means to control passage of steam through the steam trap in accordance with the temperature within the steam trap. The bi-metal strip may be straight or may have an arcuate portion on one end thereof and is constructed of alternate layers of steel and brass adjacent pairs of which may be connected together. In a modification all of the steel and brass layers may be connected together. An additional biasing steel layer may be included in the bi-metal strip. The steam trap of the invention further includes multiple coarse and fine strainers adjacent to the outlet valve and unique outlet valve structure including a flanged valve seat and cooperable conical valve member adapted to be self mounting in an opening in the steam trap.

Abstract: A water heater having an inner water tank into which cold water is passed and from which hot water is periodically withdrawn including a jacket within the inner water tank constructed of material which absorbs and gives up heat rapidly whereby on periodic withdrawal of hot water from the inner water tank, cold water entering the inner water tank is rapidly heated by the jacket which has assumed the temperature of the hot water in the tank.

Abstract: A wrench comprising a gripping member, a handle having a complementary gripping portion at one end thereof, structure for adjusting the gripping member with respect to the gripping portion axially of the handle without rotating the handle relative to the gripping member, and structure pivotally mounting the gripping member on the adjusting structure. The gripping member may have a 60.degree. or 90.degree. included angle or may be arcuate with a gripping surface extending over substantially 180.degree.. In one modification, the structure for adjusting the gripping member is rack and gear, while in another modification, it is screw and nut.