A New or Improved Pressure Regulating Device for Compressed Gas Plants.

摘要

22,959. Akt.-Ges. f³r Gas und Elektricitõt, and Karger, L. Nov. 9. Pressure - regulating valves piston valves; shocks, preventing; casings.- A gas-compressing plant for supplying gas to a lighting- system at an increased pressure is arranged so that, when the gas in the high-pressure reservoir exceeds a predetermined pressure, it actuates a regulating- valve of special construction in such a manner that some of the compressed gas is returned to the compressing-engine in lieu of the normal supply. An horizontal section of the general arrangement is shown in Fig. 4, and an elevation of the regulating-valve in Fig. 1. The latter consists of a piston k, provided with a passage o, preferably of triangular cross-section. The space p below the piston is subjected to the same pressure as the branch m, as both are in free communication with the chamber A, Fig. 4 ; the space v above the piston is connected to the branch n by a passage i, which is restricted so as to prevent undue oscillation of the piston. Normally, the valve is in the position shown, but if the pressure in the spaces p, m becomes abnormal the piston is raised and a through way is established. A rubber buffer z serves to prevent excessive concussion. The valve is prevented from rotating by a screw in the casing which engages a vertical slot in the piston. The manner in which the. complete plant works is as follows :-Gas enters a suction chamber B, Fig. 4, from the supply pipe h. Normally, the gas passes by way of a pipe f, check valve l, and delivery pipe f1 to the pilot lights of the lamps. When it is desired to feed the lamps with compressed gas, a compressing-engine of any suitable design, situated above the high-pressure reservoir A, is fed by way of the chamber B, check valve q, and pipes e, e1. After compression, the gas is discharged into the reservoir A and thence passes to the pipe f1, the check valve l preventing any back flow to the lowpressure pipes &c. E is the valve shown in Fig. 1. The space below the piston communicates with the reservoir A. When, therefore, the pressure in the reservoir A exceeds the allowable maximum, the valve is actuated and gas flows out of the reservoir through the pipe r, the valve E, and the pipe e', and so back to the engine. The check valve q is closed by the increased pressure, and so no more gas is drawn from the reservoir B until the pressure falls. If the consumption of gas is small, a part of the compressed gas may repeatedly pass through the compressor, while the latter will suck only a reduced quantity of gas under ordinary pressure from the suction reservoir B.