life of bellows valve also depends on the technology of pressure effect on the bellows. Corrugated pipe can also be designed to process fluid dressed in corrugated pipe internal or external. But by external compression corrugated pipe is difficult to by internal expansion. External pressure can make double corrugated tube life. 1 pet lines typically disposal technology by 250 psi pressure to 550 psi ( 17. 2 bar to 37. 9bar) 。 It can also be designed to four floors wall, according to the rated pressure and temperature, the wall thickness of 0. 004-0. 006in( 0. 1 to 0. 15mm) Range. Multilayer bellows with long cycle life, because of multi-layer wall Shared process pressure stress, stress instead of a single wall all under pressure. Multilayer pipe wall is higher than that of monolayer bellows available pressure applications, such as table 9. 15.

although many standard design of bellows pressure is 250 ~ 550 psi ( 17. 2 ~ 37. 9bar) Between, but the harsh conditions of the corrugated tube valve design pressure can be high to 3800 PI ( 262条) , its temperature range is - 320~1000F( - 195 - 535C) 。 Both high temperature and high pressure will affect the cycle life of bellows, as shown in figure 9. As shown in 61. As a security measure, bellows seal Industrial Valves factory is aspersed often equal to or higher than the rated operating pressure of pressure for each grain tube seal pressure test.

due to corrosion and abrasion problem, corrugated pipe is usually not be put in direct contact and fluid, instead of just for it is located in logistics from layer, is usually a strong core of above. Use a hole may be porous makes the process fluid and pressure relief were grain tube drainage were grain or outer tube inside. A problem related to the corrugated tube valve pressure may occur, which is the process fluid from logistics layer may be in neighboring regions of bellows, and cooling and thicken here, this will lead to maintenance problems or improper corrugated pipe fatigue. In this case, the external pressure is preferred ( In figure 9. 62). Because in the process of expansion, wash washing corrugated pipe outside surface is very easy. Large discharge hole can allow more fluid along the bellows peripheral circulation and prevent the cooling fluid.

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