Patent GB-190308942-A (GB)
Title: Improvements in Valves for Regulating the Pressure of Steam as Safety Valves, Reducing Valves & the like
Inventor: HORTON CHARLES PHILIP
Filed: 1903-04-21
Granted: 1904-03-10
Abstract: 8942. Horton, C. P. April 21. Actuating valves; safety-valves; reducing-valves. -Relates to valves which are weighted to open at a given pressure, the weights being reduced or increased by the displacement of a liquid, or of a solid weight, caused by excess pressure from an auxiliary relief-valve. Fig. 1 shows a safety-valve A, loaded by weights C. A vessel D, containing water or other suitable liquid, is mounted in the valve casing, and a vessel E, open at the bottom as shown, is suspended from the weights and immersed in the vessel D. The vessel E is connected by means of a pipe F, passing through the weights C, and a resilient pipe G, with a relief valve H. When the boiler pressure rises, the relief valve H opens, and the steam pressure displaces the liquid in the vessel E, which tends to float and so lightens the load on the valve A, which opens to a large extent. A spring may be used instead of the weights C. A similar arrangement of the vessels D, E and the relief valve may be applied to a lever-weighted safety-valve, in which the lever does not extend beyond the fulcrum, the vessel E being suspended from the end of the lever. In the case of a lever-weighted safety-valve in which the lever is extended on both sides of the fulcrum, a vessel containing a suitable liquid is suspended from each end of the lever, the two vessels being connected together by a resilient pipe, the vessel which is adapted to close the valve being at a lower level than the other one. The upper part of the lower vessel is connected to a relief valve. When the relief valve opens, liquid is displaced from the lower to the upper vessel, and the main valve opens. Fig. 4 shows the invention applied to a reducing-valve A. Two relief valves H, K, are provided, adapted to open at high and low pressures, respectively. The valves H, K are, respectively, connected by pipes G, G<2>, to vessels E, E', filled with suitable liquid, preferably mercury, and mounted on the lever of a leverweighted valve A'. The valve A' is connected at the top to a cylinder J, in which a piston I on the valve A works, and at the bottom to the highpressure steam. If the pressure on the lowpressure side of the valve A falls too low, the valve K opens, and liquid is displaced from the vessel E<1>, through a pipe G<1> to the vessel E, and the valve A<1> is kept closed. If pressure on the low-pressure side of valve A is excessive, the valve H opens and liquid is displaced from vessel E to vessel E', and the valve A' opens thus admitting steam to the cylinder J, and so closing the main valve A. Small holes may be provided in the vessels E, E<1> and pipes F, G to allow steam to escape when the relief valves close. In another modification, a cylinder may be provided parallel to and connected with the lever of the safetyvalve. A piston is provided in the cylinder and is driven from one end of the cylinder to the other according to the steam pressure, relief valves being connected to the ends of the cylinders. The weight of the piston will cause the safety-valve to open or close according to its position in the cylinder.