FIELD: engines and pumps.
SUBSTANCE: underwater system for drilling, production or processing comprises controlled-rpm motor for power supply, reversing fluid pump driven by the engine and hydraulic piston assembly coupled with the pump. This assembly comprises first and second chambers and piston to divide said chambers and to actuate the valve in said underground system. Fluid tank is connected with the pump, hydraulic piston assembly and pressuriser. Said pump, hydraulic piston assembly and tank are intercommunicated to make a closed fluid system.
EFFECT: normalised pressure difference between outer pressure and system inner pressure.
24 cl, 10 dwg
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