Emerson DeltaV SE4301T01 KL3001X1-BA1

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Emerson  DeltaV SE4301T01 KL3001X1-BA1 IO module In Stock

Extension bonnets are used for either high or low temperature service to protect valve stem packing from extreme process temperatures. Standard PTFE valve stem packing is useful for most applications up to 232°C (450°F). Extension bonnets move the packing box of the bonnet far enough away from the extreme temperature of the process that the packing temperature remains within the recommended range.Extension bonnets are either cast or fabricated (Figure 3.16). Cast extensions offer better hightemperature service because of greater heat emissivity, which provides better cooling effect. Conversely, smooth surfaces–such as those fabricated from stainless steel tubing–are preferred for cold service because heat inffux is typically the major concern.Bellows seal bonnets (Figure 3.17) are used when no leakage (less than 1x10-6 cc/sec of helium) along the stem can be tolerated. They are often used when the process ffuid is toxic, volatile, radioactive, or very expensive. This special bonnet construction protects both the stem and the valve packing from contact with the process ffuid. Standard or environmental packing box constructions above the bellows seal unit will prevent catastrophic failure in case of rupture or failure of the bellows.

5.The socket weld-ends are prepared by boring in each end of the valve a socket with an inside diameter slightly larger than the pipe outside diameter. The pipe slips into the socket where it butts against a shoulder and then joins to the valve with a ffllet weld. Since a ffllet weld does not fully penetrate the valve-pipe connection, some non-destructive methods are not used for these valves. Socket weld ends in any given size are dimensionally the same regardless of pipe schedule. They are usually furnished in sizes through NPS 2 (DN 50).The butt weld-ends are prepared by beveling each end of the valve to match a similar bevel on the pipe. The valve ends are then joined to the pipeline and joined with a full-penetration weld. This type of joint can be used on all valve styles. The end preparation is different for each schedule of pipe. These are generally furnished for control valves in sizes NPS 2-1/2 (DN 65) and larger

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Emerson  DeltaV SE4301T01 KL3001X1-BA1 IO module

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