Patent GB-196280-A (GB)
Title: Improvements in or relating to pressure controlling valves
IPC: G05D16/10
Filed: 1923-04-10
Abstract: 196,280. H³ebner & Mayer, and Roschanek, O. April 11, 1922, [Convention date]. Fluid-actuated valves.-A fluid-actuated valve device actuated by a piston has the piston constructed so that it forms a braking space and one or more spaces enclosed by guiding surfaces, all of which are in permanent open connection with one side of the valve. The dashpot piston is adapted to work in a cylinder supplied with fluid from the main conduit, and has the actuating and dash-pot pistons and the valve spindle, packed by means of condensate trapped between the respective surfaces. In Fig. 1, which shows the invention applied to a pressure regulator, the dash-pot piston 5 and the actuating piston 6, which has circumferential grooves 11, are secured to the actuating spindle 4 of the valve 3 and work in a cylinder 2 clamped between two parts of the casing and having an upstanding flange 2<1> arranged to prevent the joint-making packing interlering with the movements of the piston. Outlet pressure is admitted to the space below the piston 5 through a port 10, to the space between the pistons through ports 8, and the packing chamber surrounding the spindle through a port 10<1>. Fluid is supplied to the top of the actuating piston through a passage 30, throttled by a screw 41 and controlled by a diaphragm-actuated pressureregulating valve 31. This valve has a balancing piston 33 and grooved stem housed in a removable liner 34 held in the casing by a perforated cap 40. . The liner has downwardly inclined ports 38, and is fitted with a cylindrical strainer 39. A spring housed in a cap 35 secured to the valve spindle holds the spindle against the spring-loaded diaphragm 32. Excess pressure in the chamber above the piston is vented through a relief valve 14. This valve, shown in detail in Fig. 5, has an actuating ring 23 adjustably secured to the valve member 14 and adapted to work in conjunction with an adjustable fixed ring 22, and has a second actuating disc 24 working in an adjustable sleeve 25. Excess pressure in the outlet is vented through a spring-loaded valve 13 on the piston and the valve 14. The valve 13 has an overhanging lip arranged in the closed position to form an annular chamber 15. In a modification, the main valve is unbalanced. The double piston may be replaced by two tubular pistons arranged concentrically with their closed ends at the same or opposite ends. Fig. 7 shows the invention applied to a relief valve controlled by a diaphragmactuated auxiliary valve. In this modification the piston 5 is replaced by a trunk 16 arranged to work through the lower end of the cylinder, which is formed integrally with a tapered tubular deflector 46. The auxiliary valve controls the exhaust of pressure from the actuating chamber to the outlet side, and is opened by inlet pressure admitted through a valve-controlled passage 30 acting on a spring-loaded diaphragm 48. In a modification, both main and auxiliary valves are of the double beat type and the actuating piston is replaced by a diaphragm backed by radial ribs pivoted to the valve spindle and bearing at their free ends against the casing. In a further modification, the main spindle is perforated to serve as an exhaust passage. The construction shown in Fig. 1 can be modified to act as a relief valve by using the control valve 45 shown in Fig. 7 in place of the valve 34 shown in Fig. 1. The control shown in Fig. 7 may be modified by inter. posing a second auxiliary valve in the conduit 44 adapted to be closed by outlet pressure acting on a diaphragm against the action of a spring. Constructions of pressure-regulating and relief valves controlled by auxiliary valves are also described in which the dash-pot pistons are dispensed with and in which a conical depression replaces the deflector 46.