a, corrugated tube rupture problem easily cause bellows globe valves in the process of using corrugated tube rupture are the main reasons for the following three: 1, column buckling: refers to the corrugated connection of corrugated pipe transverse offset, the bellows shift into real axis arc or into s shape. Corrugated pipe for the total thickness is not enough, difficult to withstand test pressure or run,

grain number of tube wave too much and bellows big axiality deviation are prone to the unstability of the column. 2: in-plane instability, characterized by one or a few ripples plane relative to the corrugated pipe axis rotation and tilt, but the corrugated pipe center is basic on the axis of the bellows. Plane was the reason due to the instability of the

meridian produced by the internal pressure to the bending stress and circumferential membrane stress under the action of forces, corrugated tube plastic deformation happens, plane instability happens at the corrugated pipe is in a state of compression; In-plane instability column buckling or not

control, corrugated shape larger changes from the original calculation model, displacement and focus on one or a few ripples, will eventually lead to bellows soon fatigue fracture. Sometimes, though not immediately burst,

but it greatly reduces the fatigue life of bellows and the ability to under pressure. 3, corrugated pipe material and stem material is qualitative different, can be different welding performance, welding together easy to cause weld defects, and cause bellows easy perforation. 2 and closure of the large diameter globe valve and seal face is easy to damage the question 1, in their daily use of large diameter globe valve user, we often reflect a problem, namely the large diameter globe valve for pressure difference larger medium, such as steam, high pressure water pressure at work, often very

shut down, no matter how hard to shut down, always find that there will be a leak phenomenon, it is difficult to shut, the cause of this problem is by the valve structure design and the limit of the people level caused by insufficient output torque. 2, generally the big diameter pipeline opens, all need to preheat pipelines, general requirement is small steam flow through the preheating process, uniform line slowly heated to a certain extent, to completely open section

check valve, avoid to cause pipeline rapid heating up, resulting in excessive inflation, damaged part of the connection parts. But in this process, the Industrial Valves opening is often very small, resulting in the erosion rate is much greater than normal use effect, serious

reduce the service life of the valve sealing surface. Three, corrugated pipe cut-off valve, valve core, the seat is easy to damage problem because on the throttle opening, when the valve was closed, according to the velocity and pressure difference formula V2 = V1P Δ, normal steam velocity V1 = 40 m/s, if the steam pressure of 10 barg, V2 = 126 m/s, its velocity is

3 times the normal velocity! The erosion of the sealing surface by the powerful momentum, such, have multiplied exponentially, it can quickly rushed out of the valve core, valve seat surface linear grooves, prolong the life of valve exponentially decline. The other party

surface, according to the principle of conservation of energy, velocity increasing, the pressure will drop sharply, flash phenomenon at the exit. Moment can produce powerful shock wave pressure, the valve core and valve seat surface material is hit into bees

, holes, and cause vibration and noise, this is cavitation. Therefore, valve seat material hardness and abrasion resistance is very good to ensure the service life of the valve.

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