Patent GB-191229993-A (GB)
Title: Improvements relating to Steam Traps and like Apparatus for Automatically Discharging Liquids.
Inventor: BROOKE ROBERT GRUNDY
IPC: F16T1/22
Filed: 1912-12-30
Granted: 1914-03-30
Abstract: 29,993. Brooke, R. G. Dec. 30. Direct steam-pressure apparatus. - Relates to steam-traps and like apparatus of the kind in which a float-valve interrupts the supply of fluid to a chamber containing a differential piston which moves into a position for the discharge of the trap as soon as the pressure in the chamber becomes equalized, as by leakage, with the pressure acting on the differential area of the piston. The piston is so arranged that liquid cannot gain access thereto, and the float-valve is so connected to its float that fluid cannot enter the chamber to move the piston until the trap has discharged. Fig. 2 shows gravity-feed apparatus for feeding steam boilers with hot water from a pressure system. Steam pressure acting on the larger end s of a piston n maintains the valve k at the other end of the piston in a closed position against the steam-pipe g connecting the receiver c with the boiler steam space. The groove o in the piston placas the receiver in communication with the pressure-equalizing pipe f connected to the water-inlet pipe d. The valve t controlling the supply of steam through the passage r to the larger end of the piston is operated by the float u through a pin-and-slot connexion. When the passage r is closed, the steam behind the piston decreases in pressure either by condensation or by leakage to the space s' communicating with the atmosphere. Apparatus as described above may be used for forcing liquids against pressure by means of compressed air. In a modification for draining a system in which the pressure is below atmospheric, the valve t is in the form of a piston having a long range of motion and controls a passage placing the large endof the piston in communication with the atmosphere. In the bucket trap shown in Fig. 5, the admission of steam to the end s of the piston n is controlled by the piston-valve 14. The discharge valve 61 is opened and closed directly by the bucket. Fig. 4 shows apparatus for draining a chamber wherein the pressure varies from below to above atmospheric. The piston n regulates the admission of pressure fluid to and the exhaust of the fluid from cylinders 40, 41 containing pistons 37, 38 on the stems of oppositely-operated double-seated valves 33, 31, which place the receiver alternately in communication, through the passage 32<a>, with the pressure and the equalizing-pipe connexions 32, 34, and simultaneously place the piston 30 of the discharge valve 29 in communication with the equalizing and discharge pipe connexions, so that the valve is forced on its seat while the receiver is being filled and is released while the receiver is being discharged. Fig. 6 shows diagrammatically gravityfeed apparatus of the kind described above with reference to Fig. 2 comprising two receivers A, B, which are so connected that while one receiver is discharging the other is filling and vice versa, and, furthermore, which are so connected that one receiver cannot begin to discharge, although full, until the other has discharged, and vice versa. The steam-pipes 65 and the pressure equalizing pipe 68 are controlled by valves and grooves on oppositely extending stems 63, 64 on pistons 62, 62<a>. Float-operated valves 70, 69 control the supply of steam from the receivers A, B respectively to the piston chambers s. Supposing the receiver A fills and closes its valve 70 before the receiver B has discharged and opened its valve 69, then the piston 62<a> remains in the position shown, because the area exposed to the steam pressure on the stem 64 is greater than the area exposed to the steam pressure on the seated stem 63. When, however, the receiver B has discharged, the piston 62 crosses over, its stem 63 cuts off steam from the receiver B and from the stem 64 of the piston 62<a>, thus allowing the piston 62<a> to cross over and open the steam connexion of the receiver A, and the pressure-equalizing connexion of the receiver B.