GB648687A - Improvements in means of the steam trap type for separating liquids from gas or vapour under pressure - Google Patents

Abstract

648,687. Steam straps. YARNALL-WARING CO. July 28,1947, No. 20310. Convention date, Nov. 22, 1940. [Class 64(ii)] [Also in Group XXIX] In a trap for separating a liquid from gas or vapour under pressure, e.g. condensate from steam, inlet and outlet orifices 36, 37, Fig. 1, having closure valves 26, 27 respectively, and an intermediate control chamber 21 are provided, and through the orifices and chamber the main condensate discharge flows until the temperature is sufficient to cause vaporization and increased pressure in the control chamber which reduces the flow by moving the valves to closure, means being provided to ensure continuous leakage through the trap when the valves are otherwise closed. The leakage is provided by arranging that the valves never close wholly but leave an opening 29 or by means of an opening which may be formed by grooves as at 30 or openings as at 98, 144 in Figs. 5, 9 in the seats or valves so that the control chamber temperature and pressure are maintained. In the trap shown in Fig. 1, condensate at line pressure opens the inlet valve 26 and in so doing opens the outlet valve also, by pivoting the loose valve disc 27 on a pin 56. The relationship between the valves is adjusted by means of a screw 57. Various forms of the trap are illustrated and described. In one modification the valve disc 27 is replaced by a valve ball, Fig. 11 (not shown). In some the valves are rigidly interconnected, e.g. as in the example shown in Fig. 6 in which a piston 114 controls the valves, the connection 110 being pivoted at 111. The valves 94, 99 are not connected in Fig. 5, and in Fig. 10 a truncated cone 152 forms a compound valve contacting three fixed seats 153, 154, 155 and enclosing the control chamber 162. In Fig. 9, the dashpot, constituted by a cylinder 143 and a fixed piston 145, communicating with the control chamber 149 may be replaced by a bellows. The size of the orifice areas and the control chamber pressure at any stage of the operation are related by a formula which is given. Specification 432,385 is referred to.