. Reliable vacuum and vacu-vapor heating equipment . RADIATOR DETAILED DESCRIPTION OF OP^ELECTRIC VACUUM I Refer to detail chart. In order to show each part of our equip-ment plainly, we use more floor space than is necessary. The boiler, boiler connections, supply piping and radiatorsupply valves are the same as for an ordinary one pipe steamplant. The end of the steam supply main must be 30 inches ormore above the boiler water line (according to amount of radi-ation) and dropped to the wet return line, so condensation willreturn to the boiler freely by gravity. A swing check valve
. Reliable vacuum and vacu-vapor heating equipment . RADIATOR DETAILED DESCRIPTION OF OP^ELECTRIC VACUUM I Refer to detail chart. In order to show each part of our equip-ment plainly, we use more floor space than is necessary. The boiler, boiler connections, supply piping and radiatorsupply valves are the same as for an ordinary one pipe steamplant. The end of the steam supply main must be 30 inches ormore above the boiler water line (according to amount of radi-ation) and dropped to the wet return line, so condensation willreturn to the boiler freely by gravity. A swing check valve isinstalled on wet return line, beside boiler, and this permits con-densation to pass into the boiler, but prevents it backing up intothe wet return line. Air piping is installed so that each radiatoris connected to the vacuum pump and equipment. (See table ofair pipe sizes on page 78.) A VacUstat is placed on each radiator at highest vent tap-ping, and connected with air piping. Expansion tank is connec-ted to air line, before it reaches the Strainer. A glo
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