. Canadian Shipping and Marine Engineering January-December 1918. f water level. Its action is slightlydifferent from those regulators which de-pend on the buoyancy of floats or otherbodies, as the time necessary for its com-ing into action depends on the speed withwhich the expansion tube radiates itsheat. The resulting lapse of time be-tween the change of level and action ofthe regulator allows it to remain longerin each position with less frequent open-ing and closing. As illustrated in Fig. 6 the expansiontube 1 is screwed into the main bracket2, in which are also fixed two guide rods4. Th
. Canadian Shipping and Marine Engineering January-December 1918. f water level. Its action is slightlydifferent from those regulators which de-pend on the buoyancy of floats or otherbodies, as the time necessary for its com-ing into action depends on the speed withwhich the expansion tube radiates itsheat. The resulting lapse of time be-tween the change of level and action ofthe regulator allows it to remain longerin each position with less frequent open-ing and closing. As illustrated in Fig. 6 the expansiontube 1 is screwed into the main bracket2, in which are also fixed two guide rods4. The upper ends of rods 4 are tied witha bracket 6 on which is hinged a bellcrank 8, the short arm of which rests ontop of adjusting screw 9 in the upper endof expansion tube. At the lower ends ofrods 4 is clamped a bracket 11 whichcarries bell crank 10, one arm of whichis flexibly connected to the long arm ofbell crank 8, while the other arm extendshorizontally and engages with the stemof the regulating valve 14. Positiveclosing of this valve is insured by an ad-. FIG. 7. FOSTER REGULATOR WITH EX-PANSION TUBE AND MECHANICALLYOPERATED CONTROLLING VALVE. justable counter weight carried on an ex-tension of the bell crank arm. The alternate admission of steam andwater to the expansion tnbe is obtained by the method of connecting up the twoends C and D to the boiler. The expan-sion tube is first of all located at a pointcompletely above the high level of thewater in the boiler, after which connec-tion C is carried to a point below thedesired level, and connection D to a pointjust at the desired height of the waterlevel in the column. Whenever the waterlevel falls below connection from D, theexpansion tube will be filled with steam,as its lower end is also above water expansion due to the heat of thesteam causes adjusting screw 9 to raisethe short arm of the upper bell crank, sothat the long arm moves over towardthe expansion tube and opens up theregulating valve by means of
Size: 1375px × 1818px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidc, booksubjectshipbuilding
