根据市场需求，需要设计出用于生产完井管柱的坐落短节及“Check Va

根据市场需求，需要设计出用于生产完井管柱的坐落短节及“Check Valve”。要求结构合理、座封压力稳定，使用方便，性能优越，并且可以进行回收操作。<br>设计中应考虑API Spec 14L标准和相关的材料标准，识别出产品的危险应力零部件和应力类型。还要根据最大负荷来计算已确定的零部件的临界应力水平，以及设计余量的考虑。

According to the market demand, it is necessary to design the seating nipple and "check valve" for the production of well completion string. It is required that the structure is reasonable, the seating pressure is stable, the use is convenient, the performance is superior, and the recovery operation can be carried out.<br>API Spec 14L standard and relevant material standards shall be considered in the design to identify the dangerous stress parts and stress types of the product. The critical stress level of the determined parts shall also be calculated according to the maximum load, as well as the consideration of design allowance.

According to the market demand, it is necessary to design the landing nipple and "Check Valve" for production completion string. Reasonable structure, stable sealing pressure, convenient use, excellent performance and recycling operation are required. The API Spec 14L standard and related material standards should be considered in the design to identify the dangerous stress components and stress types of products. It is also necessary to calculate the critical stress level of the determined parts according to the maximum load and consider the design allowance.