The pig valve is a new type of device mainly used for pigging operations in oil, natural gas, chemicals and other liquid transportation pipelines. It can launch and receive pigs, and is used for mechanical cleaning of the inner wall of the pipeline (removing dirt, rust, and foreign objects in the pipeline), and separation of different products. It has been widely used in oil and gas fields, chemical industry, docks, oil and gas storage and transportation depots and offshore platforms.
The pigging valve is on the pressure test bench, undergoing water pressure sealing test and air pressure sealing test. The pigging valve test is divided into several steps. The assembled pigging valve is hoisted on the valve pressure test machine. The two ends are tightened and sealed by the hydraulic claws on the press. The pigging valve 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. No leakage is allowed.
All parts of the pigging valve are processed, including 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 valve seat into the valve body and valve cover, then put the ball into the middle cavity of the valve body, and then use bolts and nuts to combine and assemble the valve body and valve cover. Install the upper and lower valve stems, as well as the actuator connection plate, and finally install the worm gear drive, and the pigging valve is installed.
The ball of the cleaning valve 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 valve include the valve body and the valve cover. They have a long manufacturing period and complicated processes. The steps consist of the following steps: forging and casting are two types of blank forming methods. Casting requires the production of molds, and the foundry completes the casting of the blank. After rough processing, it enters the machine tool equipment for surface shot blasting, and then the CNC lathe and machining center are used for fine processing, and then boring processing is carried out on the boring machine and drilling processing is carried out on the drilling machine. Finally, it is polished and deburred, and the main parts are processed.
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