FIELD: oil, gas and coke-chemical industries.
SUBSTANCE: group of inventions relates to oil and gas industry, in particular, to valve units used with drilling pumps. Valve assembly comprises an axial central line, a tray guide having a rod, a tray having a movable connection with the tray guide, a flexible tray guide system, connected to the tray guide and the tray and configured to support the tray guide and trays for lateral and axial movement of guide for tray and tray relative to axial central line, flow limiter with controlled area of flow section, communicating with inner cavity by fluid medium. Plate and the tray guide form the inner cavity. Tray is movable relative to the tray guide to adjust the volume of the inner cavity.
EFFECT: reduced wear of equipment, increased service life, increased accuracy of measurements and communication quality, reduced damage of drill string.
41 cl, 17 dwg
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