Pay attention to the electric stainless steel globe valve opening and operation form

by:AIRWOLF     2020-05-22
Pay attention to the electric stainless steel globe valve opening and operation form electric stainless steel valve is closed ( The disc) Along the valve seat centerline mobile. According to this mobile form of disc, seat and disc change in his itinerary directly proportional relationship. Due to open or close the valve stem travel relatively short, and very reliable cutting function, and due to the change of his seat and disc stroke proportional relationship, is very suitable for the traffic regulation. Therefore, this type of valve is well suited for use as cut off or adjust and throttling. Electric valve disc once away from the closed position, it will no longer have a contact between the seat and clapper sealing surfaces, and thus its sealing surface mechanical wear and tear is small, so the sealing performance is good, the disadvantage is that between the sealing surface may be in liquid medium particles. However, if the disc to make steel ball or ceramic ball, the problem is solution of the struggle. Because most of the cut-off valve seat and valve disc is easy to repair or replace, and in the whole valve repair or replacement without the sealing is removed from the pipeline, the valve and pipeline welding into one occasion is very applicable. The opening of the electric valve opens, the disc height, 25% of the nominal diameter - Has reached 30%, the flow is the largest, said valve to full open position. So stop valve fully open position, should be determined by disc's schedule. Electric valve belongs to compulsory sealed valve, the valve is closed, must be pressure on the disc, to force a sealing surface does not leak. When the medium from the disc below to the valve, the operating force to overcome resistance, is stem and packing friction with the thrust produced by medium pressure, close the valve force stronger than open the valve, so it's bigger, the diameter of the stem or stem top bending failure happens. In recent years, from the seal valve, cut-off valve is replaced by the disc above the medium flow direction into the valve cavity, in the medium pressure at this moment, close the valve of the force is small, and the strength of the valve, the valve stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of valve is tight. Valves in China & other; Order to & throughout; Has rules, the flow of cut-off valve, shall be applied.
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