Cover plate 262 is generally circular in shape and defines an inner recess 264 dimensioned to correspond to, and mate with, cylindrical recess 244 in valve body 212.

• 盖板262通常是圆形的，并定义了一个内部的凹处264，该凹处之设计与阀体212上的圆柱型凹部244相容或一致。