The pig distributor is a device for controlling the running direction of pigging devices (such as pigging balls and intelligent electronic pigs). It has a rotatable valve core, and the pig distributor can be switched to connect the cleanable pipeline by rotating the valve core to a certain angle. It is a control and switching device for the running direction of the pig, which can quickly realize the function of materials sharing the same pipeline or tank area from multiple media, multiple customers, and multiple berths. It connects the passage and the isolated passage without leakage, effectively preventing the mixing of the conveying medium.
The pig distributor with an outlet angle of 135° is on the pressure test bench, undergoing water pressure sealing test and air pressure sealing test. The distributor test is divided into several steps. The outlet flanges at both ends of the assembled distributor are plugged and sealed with blind flanges. The pig distributor is in a half-open state and pressurized to 1.5 times the nominal pressure. No leakage is allowed. Then close the valve and test the valve seal in turn. No leakage is allowed.
All parts of the pigging distributor are processed, and the parts include valve body, valve cover, side cover, ball, valve stem, lower valve stem, valve seat ring, worm gear drive, bolt and nut standard parts, seals and other accessories. There are the following steps: install the lower valve stem and then put the ball into the middle cavity of the valve body, install the three valve seats in turn, and then install the three side covers into the valve body and fix them with bolts. Install the valve cover to connect it with the valve body, and finally install the worm gear drive, and the pigging distributor is installed.
The ball of the pig distributor is processed in the workbench of the vertical machining center. The upper and lower valve stem shaft holes and the upper valve stem milling groove are processed. The ball is completed by the following steps. The ball mold is made, the foundry completes the casting blank, processes the upper and lower shaft holes, and processes the outer diameter of the ball with the upper and lower shaft holes as the center axis. The outer diameter of the ball is ground to ensure the roundness of the ball, and the ball is electroplated and baked with a thickness of 30~75um and the hardness is controlled at about Vickers hardness HV700.
The main parts of the pig distributor include valve body, valve cover and side body. They have a long manufacturing period and complicated processes. The steps consist of the following steps: making molds, casting blanks in foundries, rough machining on machine tools, surface shot blasting, and fine machining on CNC lathes and machining centers, followed by boring and drilling, and finally polishing and deburring. The main parts are processed.
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