【正文】 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 as 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. UG136(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 is no possibility of the seat lifting. UG136(a) (5) in the design of the body of the pressure relief valve, consideration shall be given to minimizing the effects of deposits. UG136(a) (6) Pressure relief valves having screwed inlet or outlet connections shall be provided with wrenching surfaces to allow for normal installation without damaging operating parts. UG136(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 2 Than NPS 1|2 (DN 15), the seal shall serve as a means of identifying the Manufacturer Or Assembler making the initial adjustment. UG136(a) (8) If the design of a pressure relief valve is such that liquid can collect on the discharge side of the disk, except as permitted in (a)(9) below, the valve shall be equipped with a drain at the lowest point where liquid can collect (for installation, see UG135). UG136(a) (9) Pressure relief valves that cannot be equipped with a drain as required in (a) (8) above because of design or application may be used provided: (a) The pressure relief valves are used only on gas service where there is neither liquid discharged from the valve nor liquid formed by condensation on the discharge side of the valve。 浙江大學(xué) 畢業(yè)設(shè)計（論文）外文翻譯 畢業(yè)設(shè)計（論文）題目： 水解反應(yīng)釜設(shè)計 外文題目 :MINIMUM REQUIREMENTS FOR PRESSURE RELIEF VALVES 譯文題目： 泄壓閥的最低要求 系 （部）： 機 械 系 專業(yè)班級： 過程裝備與控制工程 0702 學(xué)生姓名： 指導(dǎo)教師： 指導(dǎo)教師評閱意見 指導(dǎo)教師簽字： 年 月 日 1 MINIMUM REQUIREMENTS FOR PRESSURE RELIEF VALVES UG136(a) Mechanical Requirements UG136(a) (1) the design shall incorporate guiding arrangements necessary to ensure consistent operation and tightness. UG136(a) (2) The spring shall be designed so that the full lift spring pression shall be no greater than 80% of the nominal solid defection. The permanent set of the spring (de?ned as the difference between the free height and height measured 10 min after the spring has been pressed solid three additional times after presetting at room temperature) shall not exceed % of the free height. UG136(a)(3) Each pressure relief valve on air, water over 140176。 F (60176。 and (b) the pressure relief valves are provided with a cover or discharge piping per UG135(f) to prevent liquid or other contaminant from entering the discharge side of the valve。 F(?30176。 (b) listed in ASTM speci?cations。 (2) The Quality Control System of the Assembler receiving the pressure relief valve parts shall de?ne the controls for the procurement and acceptance of those parts。 and (b) The parts are original and unnoticed. However, an Assembler may convert original ?nished parts by machining to another ?nished part for a speci?c application under the following conditions: (1) Conversions shall be speci?ed by the Manufacturer. Drawings and/or written instru