CONTROL VALVE WITH DOUBLE-THROTTLING SHUTTER
Control valves are discussed in the articcle. If the common controlvalve is slightly opened, its water passing shutter gap has thin circular slit form. It may cause bad regulative characteristics and lead to shutter clogging.Control valves with double-throttling shutter are proposed in the article. Different schemes for valve design are suggested. The shutter gap must be done in the shape of compact triangle to prevent clogging. The simplest way is to use a hollow ball or cilinder for the shutter tapping. The openings in the walls must have triangular form and be oriented to the opposite direction. It is necessary to use transmission gear to obtain more precise controle.Constructive scheme of common control valve may be modified to obtain double-throttling. The valve must have two partitions in its body with triangular openings in each partition. The shutter closes both openings simultaneously. When the valve is slightly opened there is double-throttling flow in the little triangular openings in both partitions. When the valve is full opened the triangular openings are large and water may flow without throttling.Proposed control valves with double-throttling shutter will have bettee regulative characteristics and therefore the controlled system will need less pump pressure.