Casting method of large-caliber high-pressure flat valve

Abstract

The invention discloses a casting method of a large-caliber high-pressure flat valve. The method comprises the following steps: by using furan resin-sand molding and cold core box resin core-making, installing a first circular waist-type heating heat-insulating feeder (1) in a middle flange part, installing a second circular waist-type heating heat-insulating feeder (2) in each of edge flange parts at two symmetrical heads, symmetrically installing a third circular waist-type heating heat-insulating feeder (3) in a valve waist part connected with an edge flange and a valve belly, installing afourth circular waist-type heating heat-insulating feeder (4) in a valve body bottom part, placing a first forming chiller (5) on the top face of the bottom of a middle flange, placing a second forming chiller (6) on the top face of the bottom of the edge flanges at two symmetrical heads, placing a third forming chiller (7) on each of the bottoms of a valve waist, and placing a fourth forming chiller (8) on the bottom of the valve body. The method is simple in process, easy to operate, low in cost, suitable for large-batch flow line production, and capable of avoiding generating casting defects of shrinkage porosity, shrinkage cavity, sand porosity, a crack and the like, guaranteeing casting quality, and meeting technical requirements of a customer.

Description

technical field [0001] The invention relates to a casting method, in particular to a casting method of a large-caliber high-pressure flat valve. Background technique [0002] Large-diameter high-pressure flat plate valves are mainly used in engineering aspects such as oil and natural gas wellhead equipment, choke and kill manifolds, and fluid control. Due to the maturity of conventional oil and gas extraction technology and equipment, a large number of land oil extraction areas have been transformed into national strategic resources, and now offshore oil extraction has turned into a boom in exploitation. As we all know, the ocean area of ​​the earth accounts for 70% of the total area, of which the deep sea area accounts for more than 80% of the ocean area, and the exploitation of deep sea oil and gas will be the future development direction. This large-diameter high-pressure flat valve used in oil and gas drilling and production in deep sea areas will have broad market pros...

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems in large-diameter high-pressure flat valve steel castings: due to the large size of the valve body and the large process mud core, the general casting process is prone to sand inclusions, shrinkage porosity, shrinkage cavities, cracks, sand pores, slag pores, etc. Defects, these defects are not allowed for large-caliber high-pressure flat valves

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