1、 浙江大学 毕业设计（论文）外文翻译 毕业设计（论文）题目： 外文题目 :MINIMUM REQUIREMENTS FOR PRESSURE RELIEF VALVES 译文题目： 泄压阀的最低要求 系 （部）： 机 械 系 专业班级： 过程装备与控制工程 0702 学生姓名： 指导教师： 2010 年 9 月 27 日 指导教师评阅意见 指导教师签字： 年 月 日 1 MINIMUM REQUIREMENTS FOR PRESSURE RELIEF VALVES UG-136(a) Mechanical Requirements UG-136(a) (1) the design shall
2、incorporate guiding arrangements necessary to ensure consistent operation and tightness. UG-136(a) (2) The spring shall be designed so that the full lift spring compression shall be no greater than 80% of the nominal solid defection. The permanent set of the spring (dened as the difference between t
3、he free height and height measured 10 min after the spring has been compressed solid three additional times after presetting at room temperature) shall not exceed 0.5% of the free height. UG-136(a)(3) Each pressure relief valve on air, water over 140 F (60 C), or steam service shall have a substanti
4、al lifting device， which when activated will release the seating force on the disk when the pressure Relief valve is subjected to a pressure of at least 75% of the set pressure of the valve. Pilot operated pressure relief valves used on these services shall be provided with either a lifting device a
5、s described above or means for connecting and applying pressure to the pilot adequate to verify that the moving parts critical to proper operation are free to move. UG-136(a) (4) the seat of a pressure relief valve shall be fastened to the body of the pressure relief valve in such a way that there i
6、s no possibility of the seat lifting. UG-136(a) (5) in the design of the body of the pressure relief valve, consideration shall be given to minimizing the effects of deposits. UG-136(a) (6) Pressure relief valves having screwed inlet or outlet connections shall be provided with wrenching surfaces to
7、 allow for normal installation without damaging operating parts. UG-136(a) (7) Means shall be provided in the design of all pressure relief valves for use under this Division for sealing all initial adjustments which can be made without disassembly of the valve. Seals shall be installed by the Manufacturer or Assembler at the time of initial adjustment. Seals shall be installed in a manner to prevent changing the adjustment without breaking the seal. For pressure relief valves larger
