Improvements in Steam Traps.

Abstract

Abstract 286. Ogden, J. E. L. Jan. 5. Check valves ; seats.-Relates to (1) valves of steam traps, especially those of the expansion type, and (2) an arrangement of tubes and frame for an expansion steam trap. In order to prevent the scouring action of the escaping water on the discharge valve, and to cause the valve to move away rapidly from the seat, the valve is provided with a double beat. The inner main part of the valve, being held on its seat by a spring or other means, is steamtight, but the outer part of the valve situated on the discharge side of the main valve, is only in easy contact with its seat. Figs. 1, 2, and 4 show two forms of lift valve, in which the valve is provided with an annular flange b enclosing a flange d on the valve seat. The flange d may be formed with a number of slits c, as shown in Fig. 2. Figs. 5 and 6 show other forms of valves, in which the flange on the seat is provided with slits k to give the flange elasticity. The flange d, shown in Fig. 1, may be similarly provided with slits. Fig. 7 shows a hemispherical valve, having a second seatp formed with an annular extension of the main valve seat. The hemisphere may be replaced by a sphere detached from the valve-stem. Fig. 10<a> shows a sphere enclosed in 'a casing having a seat on a flange of the main valve seat. The valve shown in Figs. 8 and 9 has the form of a cylinder with the frustum of a cone on its underside. The cylindrical portion is adapted to slide within an annular extension r of the main valve seat. The extension r may be provided with slots s. In a similar arrangement the main valve seat is flat. Figs. 12, 13, 14, 16, and 17 show means for enabling the outer valve to be seated at the same time as the inner main valve. Fig. 12 shows the main valve attached by a flexible connection z to an annular flange y. Figs. 13 and 14 show the main valve surrounded by a ring 2 which may be formed with a slit 3. In the arrangement shown in Fig. 16, a ring-piece 6 is connected to the main valve a by a pin 5. Fig. 17 shows a ring-piece 7 screwed on to the main valve and held in position by set-screws 10. In the expansion trap shown in Figs. 18 and 19, a tube 11 of a material with a high coefficient of expansion has its inlet end attached to a frame 13, and the other end attached to the discharge valve casing 12. The frame 13, which is provided with openings 19, carries an adjustable set-screw 23 which is adapted to operate, through a lever 14, the spring 18 controlling the discharge valve. Within the tube 11 is arranged an inner tube 24, which conveys water from the trap inlet to the valve end of the expansion tube. This tube 24 has perforations 25 which allow steam, but not water, to flow outwards through them. A screw 26, or a handle, is fitted to the lever 14 to let the trap blow through. The trap may be arranged horizontally or vertically with the valve-chest at the lower end. The discharge valve may be arranged to open against the pressure of the steam.

Inventors

• 👤 John Edward Lewis Ogden

Bibliographic Details