Patent GB-387038-A (GB)
Title: Improvements relating to the regulation of flow of gases
IPC: G05D11/00
Filed: 1931-10-05
Abstract: 387,038. Fluid-actuated valves. MILES, J. and COLCLOUGH, T. P., Brook House, Walbrook, London. Oct. 5, 1931, No. 27624. [Class 135.] A valve device for regulating the flow of gases uses the fall of pressure arising from a bend or alteration in direction of the fluid conduit for controlling a regulator or relay actuating the main valve. Fig. 1 shows the application of the invention to a device controlling the supply of a gaseous mixture to regenerative furnace. The gases are supplied by conduits a, b the latter being provided with a butterfly valve b<1> and pass through a gas regulating valve c<1> to a reversing valve d having branches e, f leading to the furnaces and a branch g leading to the chimney h. Control conduits e<1>, f<1> connected to the branches e, f lead to a reversing valve k connected by a pipe k<1> to one side of a diaphragm t. The space on the other side of the diaphragm t is coupled by a pipe c<2> to the inlet conduit between the regulating and reversing valves. The diaphragm t is coupled to a second diaphragm t<1> subject to the pressures across an apertured plate in the conduit b on the inlet side of the valve b<1>. When, consequent on a variation in the volume of flow, the balance of pressures on the diaphragms t, t<1> is destroyed they move to actuate a jet tube i<1> controlling a piston motor coupled to the butterfly to restore the predetermined condition. The reversing valve k is coupled to the valve d so that the appropriate control conduit is always connected to the pipe k<1>. One form of the valve k is shown in Fig. 2, and comprises a pair of interconnected liquid seal valves. Each valve consists of a U-tube m, one branch housing a dip pipe f<2> connected to one of the control conduits, while the other contains a displacer m<2> linked to a see-saw lever p. The U-tubes may be replaced by chambers fitted with depending baffles. A tilting liquid seal valve or a slide valve may be used for reversing. A modification is described for controlling the air supply in accordance with the gas supply and comprises a main valve in the air conduit controlled by an auxiliary valve actuated by a pair of liquid sealed bells on a see-saw lever. Each bell is divided into two chambers, one chamber of each bell being connected to the gas conduit on each side of a bend, while the other chambers are connected to the air conduit and atmosphere respectively. Specifications 224,655, 236,652, and 247,214, [all in Class 135, Valves &c.], are referred to. 387,089. Isolating-valves. DAVY, C. S., Babcock House, Farringdon Street, London. Dec. 21, 1931, No. 35355. [Class 135.] An automatic isolating-valve suitable for use between the steam drum and superheater of a boiler has an axial recess L in its operating spindle M which permits the valve spindle K which is loaded by a spring W to move between its inner end and a bush S screwed into its outer end, so that, on a sudden fall of pressure in the outlet C, the resultant of the unbalanced inlet pressure and the loading effort of the spring closes the valve H. The spindle M is thereafter screwed down on to the valve spindle K to hold the valve positively in its closed position. When the cause of the fall of outlet pressure has been removed, the valve H is raised by screwing out the spindle M until it is again in position for automatic operation. A nut R co-operates with the bush S and the inner end of the recess L to act as an entraining member for the valve spindle K. The spring W abuts at its upper end a nut U and at its lower end a washer V which also co-operates with a collar Y to limit the upward movement of the valve. The valve H is formed integrally with a plunger J controlling ports E in a barrel seat-member D and controls the flow through an axial outlet F. The nut for the spindle M is formed integrally with a crosshead O supported by bolts Q on the valve cover P. A groove m in the spindle M indicates the setting of the valve with respect to a fixed scale Z.