蒸汽发电设备的高压旁路安全阀，一般选用具有安全和控制双重功能的先导式安全阀
7、若要求对安全阀做定期开启试验时，应选用带提升扳手的安全阀。当介质压力达到开启压力的75%以上时，可利用提升扳手将阀瓣从阀座上略为提起，以检查安全阀开启的灵活性；
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意大利UNIVER不旋转活塞杆气缸
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