. Machinery and processes of the industrial arts, and apparatus of the exact sciences. water rises it lifts the smallfloat D, which is guided by the vertical rod E. VThen the float LVreaches the lever E;/ it releases the extremity of the lever E: and thelarge float D being now completely immersed, ascends with great force,closing the valve K and the small air-escape valve, and at the same timeopening the valve L. The valve L opens communication with the steamof the boiler, and thus equality of pressure is established on the surfaceof the water in both boiler and feeder. If now the valve O is o
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. water rises it lifts the smallfloat D, which is guided by the vertical rod E. VThen the float LVreaches the lever E;/ it releases the extremity of the lever E: and thelarge float D being now completely immersed, ascends with great force,closing the valve K and the small air-escape valve, and at the same timeopening the valve L. The valve L opens communication with the steamof the boiler, and thus equality of pressure is established on the surfaceof the water in both boiler and feeder. If now the valve O is open atthe top of the tube communicating between the boiler and the bottom BOILER FEEDERS HOUGET & TESTON S. 235 of the feeder, the water will descend freely, lifting the light valve M,which is placed there to prevent an ascent of the water from the boilerinto the feeder, in case O should be open when the feeder is in processof filling. As the water falls in the feeder the float D will lose its buoyancy, sothat if free to descend it would close the valve L and open the valve K,. Houget & Testons Feeder—enlarged view of upper part. in consequence of which the feeding process would be arrested. Inorder to prevent this a catch is fixed to a lever connected with the ver-tical rod W which hooks on to a stud at the extremity I of the lever E,and prevents the descent of that lever. The float D consequently re-mains suspended until the small float D has reached in its descent thecross-pin near the bottom of the rod W. By the time that so much ofthe water of the feeder as can pass out through M has made its escape,the weight of D, which will then be nearly uncovered by the water, willbe sufficient to operate on the lever by which the rod W is suspended,releasing the stud I in the lever E from the catch which detains it, andallowing the float D to fall. With the fall of this float the steam valveL is closed, and the water valve K is opened. The air-escape valve isalso opened at the same
Size: 1568px × 1594px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
