1) Casting: a kind of data molding method. The molten metal liquid is placed into the mold of the desired shape, allowed to condense, cooled and then removed from the product.
2) Forging: The processing method of heating the metal profile and placing it between a pair of anvils or metal molds to make it compact and formed.
3) Seat leakage test (seat leakage inspection): Apply the specified hydraulic pressure or pneumatic pressure to check whether there is leakage or check the leakage amount from the touch part of the seat surface, the middle mouth of the valve body, the seat installation part, etc.
4) Visual inspection: do not use the machine and check the internal and external status of the valve according to the vision. The condition of the casting surface and whether there is leakage in the shell pressure test are all attributed to the appearance inspection.
5) Visual inspection: Do not use the machine to view it visually.
6) Welding: refers to the process of heating or pressurizing a variety of materials to combine the atoms of the data and join the surface of the data.
7) Hardening overlay: In order to improve wear resistance and high temperature resistance, the surface of the base metal is attached to a metal layer of high hardness. There are tungsten, chromium, cobalt alloy welding, etc.
8) Surface hardening: It is a method of hardening the surface of metal. There are chemical methods such as nitriding treatment, carbon and nitrogen co-inundation, and physical methods such as high-frequency quenching and hardening treatment.
9) Testing: refers to the testing of the characteristics of products or parts by certain methods.
10) Inspection: Determine the characteristics and dimensions of products or parts by certain methods, and then compare them with the judgment benchmark to make a qualified and unqualified conclusion. As something inherent in the valve appears in 11), 12), 13).
11) Pressure inspection: A general term for applying a set pressure to inspect.
12) Pressure shell test (pressure shell inspection): apply regular pressure to test (check) whether there is leakage outside the valve.
13) Pneumatic test (pneumatic inspection): apply regular air pressure, and test (check) whether there is leakage from the surface of the valve, valve seat, packing · sealing gasket.
14) Non-destructive inspection: Check whether there are any shortcomings without destroying the data and parts. There are methods such as radiographic flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, and penetrant flaw detection.
15) Ultrasonic cleaning (ultrasonic.cleaning): refers to the transmission of longitudinal waves in the liquid to cause the liquid to expand and contract repeatedly, resulting in the phenomenon of vortex concave and interface mixing. This is a mechanical mixing phenomenon and a cleaning method to remove dirt and scale.
16) Degrease cleaning treatment: A treatment method that uses solvents and ultrasonic cleaning to remove attached grease.
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