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因为同时考虑对球阀关闭件密封圈的密封过程产生影响的多种多样的因素是非常复杂的。所以以此大致可说明对球阀密封比压q_r的选择为什么不能采取单一因素的态度。为什
Because at the same time consider the ball valve closure ring sealing process have a variety of factors that affect the sealing is very complex. So in this way can explain the ball valve seal than the pressure q_r choice why can not take a single factor attitude. why