Sleeved plug valves are used for on/off and throttling service in corrosion process with media temperature , such as chemical industry, Sleeved plug valves are non-lubricated valvequarter turn valve that achieve sealing through the use of a compressible sleeve as a sealing member. The valve size is from 1/2" to 30" with matching valve pressure from class 150 to class 600. Valve material can be carbon steel, stainless steel, allou steel, duplex steel etc. Sleeved Plug Valve,Manual Standard Plug Valve,Soft Seal Sleeved Plug Valve,Stainless Steel Plug Valve Yongjia South Trading Co.,Ltd , https://www.n-lvalve.com
2, to try. It is advisable that a wire head be repeatedly bent by hand, and that any product that has soft hand feeling, good fatigue resistance, plastic or rubber feel elasticity, and no crack on the wire insulation body is superior.
3, weigh. Good quality wires are generally within the specified weight range. Such as the commonly used cross-sectional area of ​​1.5mm2 plastic insulated single strand copper wire, each 100m weight of 1.8 ~ 1.9kg; 2.5mm2 plastic insulated single strand copper wire, weight per 100m 3 ~ 3.1kg; 4.0mm2 plastic Insulated single-stranded copper wire weight is 4.4-4.6kg per 100m. Poor quality wires have insufficient weight or are either of insufficient length or have too many impurities in the wire copper core.
4, than the price. Because of the low cost of making fake and shoddy wires, when selling, traders often sell at a low price for good value, which makes people fooled.
5, see the copper. Qualified copper core wire copper core should be purple, shiny and soft to the touch. The shoddy copper core copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break when it is hardened, and the wire is often broken. When checking, you just strip the wire 2cm, and then use a piece of white paper on the copper core to make a brief look. If there is black material on the white paper, the copper core contains more impurities.
1, look. See if there is a quality system certification; see whether the certificate is standardized; see if there is a factory name, site, inspection seal, production date; see if the trademark is printed on the wire, specifications, voltage, etc. Also look at the cross section of the wire copper core, superior product copper color bright, soft color, otherwise it is defective.