Commonly used cut-off valve is used in vacuum system, main is to ensure that the negative pressure condition can also be normal seal in the form of a valve. Such as vacuum boiler, such as steam system, such as vacuum gas and so on. We all know globe valve is a valve, low into the higher its seal form is a cone-shaped structure, the general stop valve cone structure suitable for ordinary water or steam piping, but its gas pipeline is not big, because of the defect of design structure, leading to the negative pressure condition will leak, but the unique structure of vacuum valve can be strictly seal negative pressure condition, and the ability to remain the seal when normal fluid through the state, the cut-off valve belongs to the vacuum valve. Globe valve is a central axis rotate through screw drive to move lower or higher to open by rev or shut down by the medium of a kind of convenient and quick a cut-off valve, the cut-off valve of the type of its minute again, such as vacuum system, it is the main function of the negative pressure condition can normal seal, such as under the condition of normal use will be shut down or adjust action, such as when use belongs to the vacuum system, we should consider whether the seal can be in the opposite direction to import medium can be completely sealed, if is at the back can also wipe seal, then it is vacuum valve, if it cannot guarantee when back in gas or liquid can not completely sealed, it belongs to the normal cut-off valve, the general points are the kinds of cut-off valve manually, pneumatic, electric, hydraulic, it mainly has a unique form of sealing on the sealing performance, otherwise is belong to normal cut off the shutoff valve. The cut-off valve for vacuum can be found in the negative pressure of 0. 01 MPa use, belongs to the super vacuum, if in 0, 1 MPa, it belongs to low pressure pay a vacuum, vacuum under a perfect vacuum is not pressure, such as vacuum system rated pressure is 0, 5 MPa, this time we can use normal cut-off valve, if negative pressure is 0. 1MPa。 So we should clear the selection of model selection of the vacuum valve, vacuum negative pressure peak is 0. 01MPa。 Vacuum Industrial Valves leakage because of the connection part of the bar appears stuck, or no lubricating oil dominate its sensitivity, it is possible that the packing parts become loose, can put the screw locking clamp, if found in packing outward extrusion, lock out this time do not belong to packing leakage, likely because of excessive pressure, the high negative pressure of various factor, the installation must be higher than that of low into, installation errors will lead to leakage.
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