Abstract: Method and apparatus for drying waste matter such as sludge accumulated in a sewage treatment facility. The sludge is mixed with flocculating chemicals and thoroughly stirred. The mixture is then allowed to drain for a predetermined time in a porous-bottomed basin. A porous web preferably of braided wire which is movable across the basin floor carries the drained sludge to a pressing facility which squeezes the sludge between a pair of linear squeezing plates. As the web leaves the basin it is joined by a second web capturing the sludge therebetween for delivery to the pressing facility. The sludge may be air-blown in the pressing facility to achieve further dryness.The common guiding roll about which the two webs merge also serves as an end wall for the aforementioned basin.

Abstract: A pressure regulator in which inlet pressure from a pressure medium is regulated by movable control means which occupies a position representative of a balanced condition between a predetermined force applied to the control means and representative of the desired pressure, and a counter force applied through the control means to the primary force application means whereupon the control means allows a part or all of the pressure medium to reach the pressure regulator outlet and whereby the remaining portion or none of the inlet pressure is bypassed through a bypass outlet.The desired pressure level at the outlet of the regulator may be altered by varying the force applied to the control means, typically through the use of weights of varying magnitude.

Abstract: An excess flow valve for use in a conduit as a precaution to quickly shut off the flow of a fluid in said conduit in the event of a rupture in the conduit. A valve disc is connected to a linkage including a two-arm lever, one arm of which engages a spring-biased stop for adjusting the distance of the valve disc to its valve seat in quiescent flow state and the other arm of which is connected to a setting device for manually or automatically closing the valve regardless of the pressure of the fluid flowing through the valve.

Abstract: A device for measuring the density of liquids. A float provided with a piece of soft iron on one side and with a permanent magnet on the other side is movably disposed in a housing through which a liquid may flow. The soft iron is surrounded by a differential winding, and the permanent magnet is surrounded by two windings with opposing fluxes and having substantially the same numbers of ampere-turns. An output lead from the differential winding is connected to the windings surrounding the permanent magnet over an amplifier. A measuring instrument connected between the amplifier and the windings surrounding the permanent magnet provides an indication of the density of the liquid flowing through said housing.