FIELD: oil and gas industry.
SUBSTANCE: invention refers to valve construction industry and is designed for creating gas pulse. Valve meant for creating gas pulse consists of body (1,2), movable valve element (5), seat (6) of the valve, control chamber (25) and outlet channel (26). Inlet hole (3) and outlet hole (4) are made in the body. For closing the valve the movable valve element is tightly attached to seat (6) of the valve. Control chamber (25) is located on movable valve element (5) side located at some distance from seat (6). Control chamber (25) contains the valve travel volume. Control chamber (25) is connected through throttling channel (10) to inlet hole (3). Outlet channel (26) is located in the fixed position between control chamber (25) and outlet hole (4). Pilot valve (28) closes and opens outlet channel (26) by means of a drive. Outlet channel (26) is passed behind seat (6) to outlet hole (4). Non-return valve (31) is located in outlet channel (26) or near it. The latter closes outlet channel (26) and prevents gas leakage from outlet hole (4) to control chamber (25) at the open position of the valve element.
EFFECT: invention is aimed at improving reliability of the valve owing to preventing oscillation movements of the valve element.
9 cl, 4 dwg
