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原JB1725-75、JB1726-75、JB1724-75规定截止阀的阀杆与阀瓣配合精度为D6/dc6,经理论与实践证明:整机装配后,部分产品阀杆与阀瓣间隙偏小,弥补不了阀杆与阀体密封面的垂直度误差,保证不了密封性能。曾做过实验,把一批密封泄漏产品的阀杆与阀瓣配合间隙加大0.5毫米,结果约有30％的产品保证了密封性能,成为合格品。因此,为消除阀杆与阀体密封面垂直度误差对密封性能的影响,提高产品合格率,在钢制截止阀采用国际标准设计时,应对产品逐品种地进行分析、计算。
The original JB1725-75, JB1726-75, JB1724-75 provisions of the valve stem and valve with the accuracy of D6 / dc6, the theory and practice have proved: After the whole assembly, some products stem and valve clearance is too small, Can not make up for the valve stem and the sealing surface of the vertical error, can not guarantee the sealing performance. Have done experiments, a number of seal leakage valve stem and the valve with the gap increased by 0.5 mm, the results of about 30% of the products to ensure the sealing performance, a qualified product. Therefore, in order to eliminate the influence of the perpendicularity error between the stem and the valve sealing surface on the sealing performance and improve the product qualification rate, when the steel stop valve adopts the international standard design, the product should be analyzed and calculated on a variety-by-product basis.