DEVICE FOR DETERMINING VOLUME CONTENT OF UNDISSOLVED GAS IN FLUID Russian patent published in 1994 - IPC

FIELD: measuring instruments. SUBSTANCE: device has controlled throttle 33 and pickup 34 of position of piston 16. In measuring, piston 17 is displaced from initial position and distributor 30 connects pump 17 with piston 15 and 16 from both sides by a signal from pickup 34. In so doing, fluid, whose flow rate is controlled by throttle 33, enters under- piston space of piston 16 through passage 20 and compensates fluid leakages over the plungers without further movement of piston 16. This prevents leakages from a compression chamber at any space between the plungers and case and at minimum volume of the under- piston space of piston 16. EFFECT: enhanced accuracy. 3 dwg