3Ö2

MODERN STEAM PRACTICE.

in communication with it and the condenser, so that steam fromthe boiler may be blown through the condenser and also into the

Fig. 243-—Kingston Valve .

Fig. 244.—Blow-through Valve .

a, Valve ehest, b, Valve . c, Spindle.d, Cotter. e, Branch piece on ship’s bottom.

A, Valve . b, Chest. C, Lifting spindle.d, Handle, e, Stud.

cylinder, warming these parts and expelling the air; thus by turningon the injection a vaeuum is formed in the condenser, before the steamfrom the valve casing is admitted into the cylinder.This valve is a spindle one, opened with a leverhandle, and is held down by the steam pressure onthe top side.

The snifting valve is fitted to the lowest part ofthe condenser; by it all the air in the condenserescapes in the process of blowing through. It isa plain spindle valve, fitted in a valve chest; thechest and valve are generally of brass, or a cast-iron chest may be substituted, with a brass valveFig. 245.—Snifting seating let into it. The steam in blowing througha, Vaive b chest °P ens the valve, and all the air is driven out; butc, Setscrew. when the injection is turned on and the vaeuum