bellows Industrial Valves factory product introduction as safety measures for staff and the general public, dangerous and corrosion conditions it is forbidden to leak any easy to launch. In some poisonous or death process, environmental protection group ( EPA) Will get part of the designated factory as an area, here allows a small amount of easy to launch. If a process extended surface includes more piping seepage, this is not often not easy to reach the parameters according to the articles of association. So the user to prohibit new easy to launch. This kind of circumstance, often need to use won't leak valve, in this case, choose bellows valve can satisfy the use requirement.

equipped with standard packing box linear valve there is a danger of leakage water. When need to zero leakage full, often use a metal bellows seal. The typical use of welding metal bellows seal structure on the core stem special molding corrugated pipe to inhibit fluid. As shown in figure 9. Shown in 60, corrugated pipe designed as bellows valve stroke and expansion or contraction. In body fluid and any potential leakage to atmosphere between channels, provide - A strong permanent obstruction. As long as keep its static sealing gasket fujian body and metal bellows seal is still intact, the launch of metal corrugated pipe is easy to loose the best solution. Equipped with bellows seal valves is limited by certain conditions, such as shorter stroke, alkali less stroke life and greater height. Equipped with bellows seal valves will increase 20% 40% of the cost, but the cost will be less monitoring and packing for maintenance.

in the operation of throttling, corrugated pipe is welded in the middle of stem travel. Corrugated tube in the middle part is flabby condition, and in the full open and full closed position, bellows elongation is equal, so make the bellows maximum service life. For the majority of throttling operation is done within the scope of 25% ~ 75%. Corrugated tube service life may be high to 200000. If the whole trip ( 0% ~ 100%) , significant life underground dropped to 60000. On the other hand, when bellows valves remain closed (most of the time Or fully open) , corrugated pipe can be welded to the Industrial Valves core are different. For many conditions, bellows stay relaxed position, can prolong its life. Number of metal bellows cycle life can be said, that is, corrugated pipe can stretch to all its limit and compression surface without damage. Because all the expansion and contraction cycle includes a complete, rated at 10000 weeks of bellows, actually can move 20000 times full valve stroke. Because of throttling operation does not require a full open or full closed position, the bellows elongation and compression is less than whole trip, it will further extend the life of the corrugated tube. Beryllium grain tube life can also be set by changing process controller tuning. Process controller tuning can be high enough to continue to search for the right signal, to send a minimal signal of the valve, the valve with each signal to change its position. Although it is rare, but bellows valve continue movement will shorten the bellows overall life. Rated ripple pipe life value is by the slope of grain to withstand the minimum number of cycles the maximum operating temperature and pressure are determined. Although the corrugated pipe is designed for the operating conditions, and the actual operating conditions is generally lower than the maximum temperature and pressure, it further prolong the life span of the bellows. If this meant that the life of the corrugated pipe is greater than the expected life many times. Some working condition requirements of the job in less than the rated operating conditions to travel with smaller motion. Rated 10000 weeks of bellows, for example, can provide more than 00000 in accurately under the given conditions of trip, table 9. 14 said lower half trip how to significantly extend the service life of bellows.

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