CKOD-R1 Orifice check valve
CKOD-R1 Orifice check valve is designed for equipping the casing string bottom in order to ensure self-filling of the descended columns with the drilling mud from the well without its overflowing from the column to the mouth. To perform the "stop" ring function and to provide the leak-proof fit of bypass plugs on it in the process of pushing the cementing slurry into the outer annulus and to prevent the backflow of liquid from the well to the column after consolidation is completed. The inclination of the borehole axis at the valve installation site should not exceed 20°. .
The valve is designed for operating at descending the casing strings at a rate of up to 1.5 m/s and at presence of oil-based drilling mud and cementing slurry with a density of up to 24003, and a temperature of up to 130°C in the medium during operation. Chemical activity must is10 pH, sand content is up to 1.5% of the volume. Maximum flow rate through the valve is 60 l/s.