为了保证汽缸在两次大修间隔期内不漏泄,汽缸螺栓必须具有一定的预紧力,必须考虑材料高温蠕变而产生应力松驰的影响,必须保证两次大修间隔期内,螺栓的应力大于法兰运行中所需的最小密封应力。一味加大螺栓的预紧力是不恰当的,这会加快螺栓材料的应力松驰速度并导致螺栓的损坏。 In order to ensure that the cylinder does not leak during the two overhaul intervals, the cylinder bolts must have a certain pre-tightening force, the material must be considered high-temperature creep and stress relaxation effect, we must ensure that two overhaul interval, the bolt stress greater than Minimum seal stress required for flange operation. Simply increase the bolt preload is not appropriate, which will speed up the stress relaxation of bolt material and lead to bolt damage.