Electric brake pneumatic valve pneumatic seat ring welding and processing technology improvement

abstract: through to the electric brake pneumatic valve pneumatic seat ring surfacing welding alloy is easy to cause deformation analysis, improved the welding and processing technology, improves the machining efficiency and quality of the product.
keywords: brake pneumatic valve; Surfacing; Alloy


electric brake pneumatic valve structure of electric brake pneumatic valve is petrochemical heavy push device used for on-off key of flue gas medium pneumatic valve, it has the long life, low maintenance cost, small flow resistance, high temperature resistant, scouring resistance, wear resistance, high hardness, etc, it is characterized by wide sealing ring, special sealing surface with the steam seal ring groove and lip seal, as shown in figure. Figure (

。 Stuffing box. Pneumatic valve plate. Pneumatic valve body Ⅰ. Sealing ring. Pneumatic valve plate. Pneumatic valve body Ⅱ. The pneumatic valve cover. The pneumatic valve cover)
the original process of electric brake pneumatic seat ring
the appearance of the pneumatic valve pneumatic seat ring size is larger, the thickness. Mm, and the middle hole is larger for Φ mm, the total length more than mm, belongs to the typical poor rigidity, variability artifacts. Pneumatic seat ring for ZGCrNiTi substrate material, the ring sealing surface and the guide parts of carbide surfacing (as shown Blackening parts for surfacing welding alloy) 。 General processing according to the following process: coarse before the car plane and annular welding groove, plane guide rail welding groove, welding, in addition to the stress of heat treatment, leveling, essence of the car under the plane and the ring sealing surface, plane guide rail. Figure


often exist the following problems: according to the process after welding, seat deformation serious, become warped on A, B two parts, especially the guide rail tail C, D become warped on two parts is particularly serious, despite the leveling for many times, but A, B, C, D, corresponding to the seat on the back of the part, often lack of machining allowance. And after processing to finished product, seat rail lateral surfacing welding alloy thickness, sometimes even no alloy; Because of the pneumatic valve is used for catalytic cracking unit, its circulation medium for high temperature, corrosive medium, due to the shortage of the alloy seat performance fell sharply, the serious influence its use, pneumatic valve life shortened, even lead to the emergence of the waste.
the improved processing technology


graph for electric brake pneumatic valve guides and the matching of the pneumatic valve board schematics, guide rails are wedge structure, guide rail and seat assembly, formed in the space Angle, pneumatic valve plate guide in the gap between the mobile. Pneumatic valve is turned off its pneumatic valve plate and seat ring sealing face of the gap is less than average. mm。 The pneumatic valve, pneumatic valve is normally open normally, shut down no more than a year closing, on the one hand, by the power of the circulation medium pneumatic valve plate and seat against, on the other hand, by the pneumatic valve plate wedge, pneumatic valve plate and seat sealing surface against, so as to achieve the purpose of sealing.
the pneumatic valve switch trip for mm, theory circle rail work attendance length is mm ( Since pneumatic valve center) , in fact, seat slideway unless the pneumatic valve crossing the circulation medium erosion, the rest of the only guiding role, so we can be on the premise of meet the requirements of working condition of shorten seat slideway of surfacing welding parts, make its length is more than half of the ring sealing surface diameter mm ( Since pneumatic valve center) Can.
considering the above reasons, we adjust the process as follows: coarse car plane and annular welding groove, coarse car guide rail welding parts ( Rough turning figure as shown in figure) , cross line guide rail welding position, welding, heat, leveling, fine car ring sealing surface, fine plane guide rail, in the early stage to try to increase the rigidity of workpiece, and reduce process flow, seat tail first not processing, after finishing the o-ring seal and guide rail, in guide rail and the ring sealing surface crack is there are still a lot higher than that of blank sealing surface and the guide rail, must remove it, we adopt milling. Figure


in the
the sealing surface and guide rail welding car at the same time, reduced the process cycle time. Guide rail welding length decreases, and reduce the welding deformation and the number of leveling, improved the processing properties of seat.

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