FIELD: oil-and-gas production.
SUBSTANCE: proposed valve comprises body to be fitted on, in fact, vertical tube top end, discharge branch pipe extending from said body to enter said tube, discharge channel with sealing edge to be sealed by sealing element arranged inside said body to turn between closed and open positions. There are also displacing element to displace said sealing element into open position and weight articulated with said sealing element and extending downward into aforesaid tube. Note here that said weight applies force in direction opposite said displacing element. Resultant force acting on sealing element defines the position thereof so that with fluid lever increasing in said tube sealing element displaces into open position.
EFFECT: higher reliability, expanded performances.
17 cl, 5 dwg
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