In the clinical medical experiments usinghuman venous blood as specimensome take the serum from the specimen as the experimental object.The blood collection tubes suitable for this type of medical tests are called serum blood collection tube.
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Imported buried ball valve, also known as direct buried ball valve, direct all-welded ball valve design features a full welded, equal diameter and diameter channels, the use of fixed ball and floating ball, dual piston sealing system, long stem , Long body, long stem, short body, direct buried. Buried all-welded ball valve is mainly used for urban heating, industrial water, natural gas pipelines, petrochemical, steel, steel companies all kinds of pipes. ã€Imported buried ball valve features】 1, the use of all-welded structure, there is no flange leakage, and the pipe with butt welding or flange connection. The former does not have pipe and valve flange connection leakage, the latter is easy to remove the maintenance valve. 2, seat sealing surface material according to different media can choose PTFE, nylon, alloy steel, carbide, etc., can adapt to a wide range of different temperature, pressure and corrosion requirements. 3, the stem can be extended according to the specific installation of the user in order to facilitate ground operations. 4, Compared with the same specifications of conventional ball valve with small size, light weight, beautiful appearance, durability and so on.