| 摘要 |
FIELD: oil and gas industry, particularly sealing or packing boreholes or wells. ^ SUBSTANCE: device comprises body with preventer installed between upper and lower flanges. Preventer has shutoff tool and drive hydraulic cylinders with automatic preventer triggering mechanism. The mechanism is made as pipe connected with body interior and provided with spring-loaded piston with shaft and slider located in the cylinder. The slide is fixedly connected to the shaft and is provided with grooves. The cylinder is communicated with atmosphere. Body interior is connected with over-piston and under-piston hydraulic cylinder cavities through slide grooves. Device is provided with check valve arranged in pipeline, which connects body interior with slide cylinder, and with hydraulic accumulator communicated with pipeline in section defined by check valve and slide cylinder through valve to provide body closing with shutoff member as dynamic pressure falls in the body. The pressure drop is caused by main pipeline or fitting damage. Hydraulic accumulator may be recharged from body pressure. ^ EFFECT: increased reliability of preventer closing. ^ 1 dwg |
