METERING DEVICE Russian patent published in 2000 - IPC

FIELD: automatic control equipment, in particular, for depth oil well device for movement of water-sand perforator. SUBSTANCE: device has housing and screw, which is mounted on threaded joint in housing. Housing and screw jointly provide a chamber, which inner end surface has spiral groove, which connects input and output holes, while chamber is filled with material, which is not wetted by working liquid. Chamber contains bimetallic plate, which is supported by screw and bottom of tank, which is open on one side and contains said material. Other claims of invention disclose device design in which groove on end surface of chamber is zigzag-shaped, material, which is not wetted by working liquid and has bulge that enters groove, is either hard or soft. EFFECT: increased precision of working liquid supply upon temperature changes under constant pressure drop. 5 cl, 4 dwg