THROTTLING DEVICE Russian patent published in 1998 - IPC

FIELD: hydraulic and pneumatic systems of equipment working under high pressure; delivery of liquid or gas under high pressure to measuring instruments, to pressure gauge, for example. SUBSTANCE: pressed in connecting pipe union of throttling device is taper threaded insert which forms helical passage. Taper angle ranges from 1 to 3 deg. Insert is provided with circular groove of rectangular, half-round or trapezoidal section. Insert is also provided with axial and radial passages brought in communication with helical passage. Thread has plane-cut crest of 0.2 to 0.4 mm at pitch of 0.5 to 0.75 mm. EFFECT: enhanced efficiency and operational reliability. 4 dwg