NAVY MIL-V-24517 (2)-1977 VALVE STEAM PRESSURE REDUCING QUIET DESIGN《静设计的蒸汽降压阀》.pdf

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1、MIL-V-2Y517 (2) L( = 7779906 Oqb3qbY 5 r- 1 t MIL-V-24517 (SHIPS) - AMENDMENT- 2 10 February 1977 SUPERSEDING AMENDMENT- 1 26 September 1975 MILITARY.SPECIFICATI0N Vka, STEAM PRESSURE REDUCING, QUIET DESIGN This amendment forms a part of Military Specification MIL-V-24517(SHIPS) , 28 April 1975 and

2、is approved for use by the Naval Sea Systems Command and is available for use by all Departments and Agencies of the Depart- ment of Defense. PAGE 2 # 3.3, Table I, under Materials, opposite “Cylinder, liner and piston“: Delete “44OoCn and substitute “440C“. PAGE 3 3.4.7, third sentence: Delete. PAG

3、E 4 # 3.4.10.1.1, delete and substitute: “3.4.10.1.1 Quiet-flow re ulatin element. Element design employed to achieve a low- noise pressure loss shall avow excessively small flow passages or any other feature jeopardizing operational reliability. of the quiet-flow regulating element shall assure tha

4、t the cross-sectional area at the point of greatest restriction of any given flow passage shall not vary by more than plus or minus 3 percent on a unit-per-unit basis from the nominal point and that the overall flow capacity of the regulating element shall not vary by more than plus or minus 5 perce

5、nt on a unit-per- unit basis. capable of withstanding installation and operational stresses. such that under any production tolerance condition 0.033-inch diameter perforated metal screen type strainer installed upstream will protect against clogging. shall not be required more often than annually.

6、Replacement due to blockage, erosion, wear, etc. not more often than once every 5 years. onboard ship, either by backflush or with ultrasonic equipment. Any special fixtures necessary for cleaning of the element shall be supplied with each valve. The element struc- ture shall be of a solid or contin

7、uous nature, not susceptible to media migration.“ The design and method of fabrication and inspection It shall be brazed or otherwise fabricated into a one-piece configuration Internal passages shall be Element cleaning The element shall be capable of being cleaned # 3.4.10.1.2, line 7: Delete “leve

8、r“ and substitute “liner“. 3.4.10.2, third sentence: Delete. 3.5, item (b): Delete “250 to 740“ and substitute: “315 to 850“. PAGE 5 3.6.4, line 2: Delete “130 to ZOO“ and substitute “150 to 180“. # 3.6.5, add: “Structureborne noise levels at frequencies above the 3.15 kAz 1/3 octave band of up to 1

9、0 dB above this requirement are acceptable for low rates above 7,500 lb/hr.“ PAGE 6 # 3.8.1, add as item (h): “(h) calculations verifying compliance with the flow passage and overall flow- rate consistency requirements specified in 3.4.10.1.1. sional inspection shall he detailed.“ Required dimen- FS

10、C 4820 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24517 (SHIPS) AMENDMENT-2 PAGE 7 V 4.3.1, third sentence after listing: . Delete and substitute: “This valve shall also have an accelerometer block welded to the body and an accelerometer b

11、lock welded to the out- let flange.“ 4.3.5, line 2: Delete “130“ and substitute “150“. 4.3,7.1, line 1: Delete “250“ and substitute “315“. 4.3.7.1, line 2: Delete “130“ and substitute “150“. PAGE 8 4.3.7.2, line 2: Delete “200“ and substitute “180“. 4.3.1.4, lines 1 and 4: Delete “250“ and substitut

12、e “315“. # Add as paragraph 4.4.1.1: “4.4.1.1 The quiet-flow regulating element shall have undergone, during production, the inspection detailed in 3.8.l(h). element shall be maintained by the manufacturer and, made available for Government inspection for at least 5 years after delivery of the valve

13、 (or element).“ A complete record of the inspection results for each PAGE 9 # 4.4.6: Delete: PAGE 12 Figure 1: Delete, NOTE: The margins of this amendment are marked “11“ to indicate where changes (additions, modifications, corrections, deletions) from the previous amendment were made. This was done

14、 as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. Preparing activity: Navy - SH (Project 4820-N370) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-