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With import pressure relief valves, pilot vavel disc role in the fluid pressure Fx attendant increase, when more than equal to Fx Pt2, pilot valves valves mouth opened, the pressure relief valves to import oil by damping hole, Pilot valves valves mouth overflow relief valves to export, and then back to the fuel tank.

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With import pressure relief valves, pilot vavel disc role in the fluid pressure Fx attendant increase, when more than equal to Fx Pt2, pilot valvesvalves mouth opened, the pressure relief valves to import oil by damping hole, Pilot valves valves mouth overflow relief valves to export, and then back to the fuel tank.

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This item is a new type structure direct-acting overflow valve, which adopts dynamic pressure feedback principle. That is it adds a feedback cavity on common direct-acting overflow valve's core. When there is overfall on valve port, the hydraulic force of valve port will balance with feedback cavity's hydraulic force and spring force, so it can decrease spring's stiffness, just like adding a hydraulic spring, which works together with mechanical spring, so as to minish valve port pressure range.

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Experiment: respectively measures the reaeration ability of the smooth overflow surface and roughened overflow surface(hemispheroidal surface and stepped surface), and analyses contrastively the effect and reason of reaeration improving after roughened modification.

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Rubber dam laboratory model experiment: respectively measures the reaeration ability of smooth overflow surface and roughened overflow surface, then contrastively analyses the effect and reason of reaeration improving after roughened modification, and the reaeration effect between curve dam and rubber dam.

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Study on effect of spillway trough on deposition efficiency of intermittent scouring sand basins;2. Traditional sediment tank has been improved in three aspects by putting an adjusting flow wall in the entrance of water, a spillway trough on spillway crest along the flow direction, redesigning the flush device and an auxiliary fl ush facility.

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When the flow rate through the Poppet head reaches a certain size, balance piston upper and lower chamber of the two oil pressure difference will create upward hydraulic pressure exceeds the spring preload and balanced piston friction and balance the sum of the piston weight and other forces, balance piston upward, so that the pressure port and overflow port interlinked, a large number of pressure from the oil will flow back into the fuel tank from the overflow port.

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The influences of the inlet diameter, overflow diameter, underflow extension pipe length, split ratio, feed flowrate and temperature on the separation performance are analyzed.

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