Pigging pneumatic valve structure characteristics and working principle

pneumatic valve in the pipeline pigging pigging only play the role of transmitting and receiving pig, for the pipeline pigging is pig.
pigging structure characteristics of the pneumatic valve is in the T T fixed pneumatic ball valve structure principle after modification and adding features based on innovative design of new type of pneumatic valve.
pigging working principle of pneumatic valve is put pig in pigging pneumatic valve ball cavity in the body, through the sphere in perpendicular tee pneumatic valve body, do % rotary motion. When the spheres channel and pipeline in the same axis, the pig under the action of the fluid pressure in the pipe, pneumatic valve was pigging launch.
according to different purposes, pigging pneumatic valve can be divided into three categories:
the first: standard ( PC type
sphere diameter is larger than link pipe diameter about %, one end of the aperture has allowed medium through the article but can keep the files of pig, in and out into the pig, fluid short-term cut-out.
the second: type by-pass ( PB type
in is not allowed to transfer medium short-term cut-out occasions, use the by-pass pipe pneumatic valve. It's ball is bigger than standard pigging pneumatic valve, aperture size and structure and standard pigging pneumatic valve, but in the aperture axis vertical two by-pass port and grad its total flow area is about % of pneumatic valve aperture section. Pig launch receiving fluid flow not break during the whole process.
the third: isolation ( PS type
sphere aperture is bigger than connection pipe diameter about %, only as far as possible in order to reduce the hybrid isolation medium, downstream on the ball, the aperture gear upstream side installation has additional sealing ring.
pigging pneumatic valve is T T fixed pneumatic ball valve, installed in the oil and gas long distance pipeline. Therefore, the design of the pigging pneumatic valve specifications GB/T - execution The pipeline pneumatic valve technical conditions, GB/T - The oil and gas industry belt conveying pipeline system and the American petroleum institute API standard D - The pipeline pneumatic valves. Pigging pneumatic valve design, the calculation method of the same as the conventional fixed pneumatic ball valve.
pigging pneumatic valve is based on the principles of fixed pneumatic ball valve structure improvement and innovative design of new type of pneumatic valve after adding features. It by sphere ° rotating pneumatic valve opening and closing, using double piston effect for sealing, and according to the characteristics of the pneumatic ball valve designed to double block and the emission function, make the pneumatic valve in full open or close state can discharge medium in the body cavity. It inherits all the advantages of the fixed type pneumatic valve ball, adaptability and fixed pneumatic ball valve have equal. Its aerodynamic body side runs perpendicular to the center line of the passage of the branch, branch pipe installed on the fast-opening blind and emissions pneumatic valve, make the pig can convenient to pigging pneumatic valve or take out. Spheres channel setting can stop at the end of the pig through the article and permits the medium circulation.