REIWI,ATORS, I. DAMPER 11.DitmAtruits.— The Mason ;gram Damper Regulator is shown in Fig. 1. It is designed to automatically maintain any desired pressure in it steam boiler by controlling the draft. 'lite operation of the regulator is as follows: The boiler pressure, which is connected at the pipe. G. comes into the cham ber. E, the top of which is formed by a diaphragm, on which rests the main spring, S. If the boiler pressure rises above the required point, or sufficiently to ovoreome the tension of the spring, S, the dia phragm is raised very slightly and the steam passes down the passage. X, to the upper surface of the pis ton. D, which it forces down. This piston being eonuet•ted with the wheel on the shaft, IT, by a diain, or rack and pinion, turns it around. eommspicatiug it like motion to the outside wheel, and thence to the damper in the flue.
When the boiler pressure falls, the diaphragm comes on to its seat, which covers the passage, X, and steam pressure is removed from the top of the piston. 14 while the weight on the damper brings the wheel, P, back to its original position.
f(ellanz's Asleam, Dumper Regulator is shown in Fig. 2. The instrument consists of a piston. V. upon which is a projecting ground-joint. W. contaill hig water-packing grooves, upon which works an ac curately fitted cylinder, IL, which is in turn covered by a sleeve, C (weighing from 12 to 50 lbs., accord ing to the size of the machine). To the bottom of the piston is screwed the section, U. in which is fitted the valve, on a raised seat. I'pon this valve rests the stein, P, the top of this stem hearing against the weighted lever, F. The operation is as follows : The weight, I (from 11 to 2.1 lbs,), is adjusteu on lever. F, so that the valve, V, will open at the pressure which it is desired to carry on the boiler when the steam entering ports, Q, passes through the piston, F raising the cylinder gradu ally till cap, L, comes in contact with the bottom of ground-joint, TV, at which time the damper is entirely closed. As the boiler pressure lowers,
valve, is pressed to its seat by weighted lever, F, and as the condensation passes from within the piston through the pet-cock, E, the cylinder descends, drawing the damper open.
The Ourtis Damper Regulator is shown in Fig. 3. It consists of a composition cylinder, within which is a piston fitted with water packing. The piston-rod is connected by a chain, over guide rolls, to the lever of the damper. on which is hung a weight sufficient to over haul the piston and open the damper regardless of any ordinary friction. The motion of the piston is con trolled by a metallic dia phragm, which operates the valve, alternately clos ing and opening thedamper as the boiler pressure in creases or diminishes. The regulator is fastened to the wall of the boiler-room ; the top pipe is connected to the boiler, and the lower pipe to the drain, ash-pit, or heater. The normal condition of the damper is to be wide open, the weight holding it in that position. To operate it, a given load—say 60 lbs. to the inch—is produced on the regulator diaphragm, by screwing the handle in. When the pressure in the boiler reaches 60 lbs., it lifts this load and permits steam to enter the space over the piston, slowly pushing it down and closing the damper. When the boiler pressure falls below 60 lbs. the valve closes, and the pressure, passing from the top to the bottom of the piston, puts the piston in equilibrium, and allows the weight, slowly settling d win, to open the damper, thus controlling the pressure at the desired limit.