Patent GB-394547-A (GB)
Title: Improvements in liquid level regulators intended particularly for use with steam generators
IPC: F22D5/10
Filed: 1932-10-25
Abstract: 394,547. Fluid-actuated valves. WEIR, Ltd., G. & J. and HILLIER, H., Holm Foundry, Cathcart, Glasgow. Oct. 25, 1932, No. 29821. [Class 135.] In a liquid-level regulator for steam generators which is a development of that described in Specification 376,873, the feed inlet valve N mav have more than one piston integral therewith, and the needle valve T controls the flow of water into at least one of the chambers in which these pistons move, the discharge from these chambers passing with the feed water into the generator. The total area of the piston or pistons is greater than the area of the valve, the opening movement of which is opposed by a resultant hydraulic force depending upon the rates of flow past the needle valve, the float-operated valve and a fixed orifice or orifices. In Fig. 1, the piston O moves in a chamber M which is fed by parallel flows through pipes K, L via the float-operated valve C and through a passage Z<1> controlled by the needle valve T. Water leaks from the chamber M by way of the piston clearance and through a pipe W having a restricting diaphragm A<1> or a manually-adjustable restricting device. The float A which moves in a chamber F connected by branches G, H to the generator is on the opposite side of the fulcrum E to the valve C which is thus closed as the level in the generator falls. The valve T and the seat D are adjustable by screwing, lock nuts C\ U being provided respectively. The seat S is also adjustable by means of washers Z. The lift of the valve N may be limited or the valve may be closed by a screw-down spindle V. In Fig. 2 (not shown) the valve C is pivoted on the same side of the fulcrum E as the float and the flow from the chamber M passes to the generator in part through the valve C so that the valves C, T are in series. In the modification in Fig. 3, the piston O is below the valve N which has a piston-like extension O<1>, a passage Z<1> in which is controlled by the needle valve T. The piston O<1> moves in a chamber M<1> the discharge from which passes to the chamber M. In this form, the valves C, T are in series and the float and valve C are arranged as in Fig. 1. The form in Fig. 5 (not shown) differs from this only in that water is led to the chamber M<1> by a branch pipe and the valve T controls the flow from the chamber M<1> into the chamber M. The form in Fig. 4 (not shown) differs from that in Fig. 3 in that the valves T, C are in parallel and the valve C is arranged to rise with the float as in Fig. 2. In another form, Fig. 6 (not shown), similar to that in Fig. 4, the passage Z<1> is replaced by a lateral pipe as in Fig. 5, the valve T controlling the flow out of the chamber M<1>. In Fig. 7 (not shown) the valves T, C are again in series but do not connect with the chambet M which is supplied solely by leakage from the inlet branch Q.. In Figs. 1, 2, and 7 the needle valve opens with the inlet valve, but in the other forms the valve T closes as the valve N opens. In all the constructions, either the seats or the valve members themselves, of the valves T, C may have parts of successively differing taper or may be of curved conical section so that the variation in water level necessary to produce a given lift of either of the valves N, C is adjustable. Specification 376,264 also is referred to.