. Science of railways . up through the inside of valvey, out the ports E-E into the annular opening Fleading to the atmosphere at B. To Close the Blow-Off Cock.—Turn the three-waycock in the cab to its original position, which exhauste LOCOMOTIVE APPLIANCES. 549 all pressure from C and the top of piston P. Theboiler pressure from A now acts against the bottomof valve V and forces valve and its piston up toposition shown in cut, and the valve makes a jointat W-W, thereby preventing any further wastage ofwater. Scale or dirt caught in the ports D-D or E-Ewould be sheared off when the valve close
. Science of railways . up through the inside of valvey, out the ports E-E into the annular opening Fleading to the atmosphere at B. To Close the Blow-Off Cock.—Turn the three-waycock in the cab to its original position, which exhauste LOCOMOTIVE APPLIANCES. 549 all pressure from C and the top of piston P. Theboiler pressure from A now acts against the bottomof valve V and forces valve and its piston up toposition shown in cut, and the valve makes a jointat W-W, thereby preventing any further wastage ofwater. Scale or dirt caught in the ports D-D or E-Ewould be sheared off when the valve closes, and CAPK ^—Connection to Boiler. B—Blow-Off to Atmosphere. C—Air or Steam Connection. Z>-Z>—Intake Ports of Valve V. £-^—Outlet Ports of Valve V. F-F—AnrwAzr Opening to Blow-Off at B. (7—Annular Opening to IntakePorts D. //•//—Vent Ports of Spring Cham-ber. /^/^Piston, K— Cap for removing Piston,Spring and Valve. 5—Spring. F—Valve and Piston P. combined. ^-^F—Valve Seat when CONNCCTlON TO BOIICR Climax Blow-Off Cock. scale on seat W-W ordinarily crushed. If the valvefails to close tight, open and close it quickly a fewtimes until it forms a tight seat at W-W, The spring S is for the purpose of preventingthe valve opening from any vacuum formed whenthe boiler is cooling down. Hence, if the valve leaksat such time, cap K should be removed and thisspring examined. 550 LOCOMOTIVE APPLIANCES. THE **LITTLE GIANT PNEUMATIC BLOW-OFF COCK. The acompanying engraving shows clearly by ar-rows the flow of pressures and fluids when thisblow-off valve is in operation. Air pressure has en-tered the air cylinder and forced the piston, with itsattached valve inside the boiler, to the right, allow-ing the water and the sediment in the boiler to es- Mf I ) )) OiSaiARCI
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