A flue restrictor for installation in the flue piping of a heating system to reduce its effective cross sectional area comprises sheet metal inlet and outlet sections having flanges secured together in a joint that has a guideway in it for a sheet metal gate valve that may be transversely positioned to produce the desired cross-sectional area and riveted in place to provide a substantially tamper-proof assembly.
申请公布号
US4263890(A)
申请公布日期
1981.04.28
申请号
US19780939069
申请日期
1978.09.01
申请人
MICHIGAN CONSOLIDATED GAS COMPANY
发明人
TURKO, JOHN W.;DAY, MAURICE N.;DESCHERE, LINDA M.;PRITZ, HOWARD B.;SCHLUER, LARRY E.;SEIDEL, HENRY F.;TALBERT, SHERWOOD G.;WHITE, EARL L.