1、 Comments, suggestions, or questions on this document should be addressed to U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact i
2、nformation can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 4820 INCH-POUND MIL-PRF-12125H 27 April 2011 SUPERSEDING MIL-PRF-12125G 6 March 1996 PERFORMANCE SPECIFICATION VALVE, GATE: QUICK-OPENIN
3、G, CLASS 125 CAST IRON, WITH POSITION LOCK This specification is approved for use by all Department and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers 125-pound (Metric class PN10) class rating, cast-iron, bronze-trimmed, position-locked, quick-opening gate valv
4、es. 1.2 Classification. Valves are of the following styles and sizes, as specified in table I (see 6.2): TABLE I. Styles and sizes. Style Size - inches (in.) A - Threaded 2 2.5 3 4 B - Flanged 2 2.5 3 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
5、-MIL-PRF-12125H 2 1.3 Part or identification number. The specification part number of the valves covered by this specification will be designated in the following form (see 3.9 and 6.2): M 12125 X X Size code number (see table III) Style code letter (see table II) Specification number Prefix 1.3.1 S
6、tyle code letter (see table II). TABLE II. Style code letter. Style Description A Threaded B Flanged 1.3.2 Size code number. The valve size will be designated by the following code numbers (see table III). TABLE III. Size code number. Code number Size (in.) 1 2 2 2.5 3 3 4 4 EX: M12125A4 - Specifica
7、tion part number for a valve made to a specification MIL-PRF-12125, threaded and 4 inches in diameter. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections
8、 of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whet
9、her or not they are listed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12125H 3 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues
10、of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI/ASQC Z1.4 - Sampling Procedures and Tables For Inspection by Attributes ANSI/SAE AS478 - Identification Marking Methods ANSI/ASME B1.1 - Unified Inch Screw Threads (UN and
11、UNR Thread Form) (Copies of these documents are available from www.ansi.org or ANSI Customer Service Department, 25 W. 43rd Street, 4th Floor, New York, NY 10036.) AMERICAN SOCIETY OF MECHANICAL ENGINEERS ASME B16.1 - Cast-Iron Pipe Flanges and Flanged Fittings (Copies of these documents are availab
12、le online at http:/www.asme.org or from American Society of Mechanical Engineers, Orders/Inquiries, P.O. Box 2300, Fairfield, NJ 07007-2300.) ASTM INTERNATIONAL ASTM A47/A47M - Standard Specification for Ferritic Malleable Iron Castings ASTM A126 - Standard Specification for Gray Iron Castings for V
13、alves, Flanges, and Pipe Fittings ASTM A197/A197M - Standard Specification for Cupola Malleable Iron ASTM A536 - Standard Specification for Ductile Iron Castings ASTM B21/B21M - Standard Specification for Naval Brass Rod, Bar, and Shapes ASTM B61 - Standard Specification for Steam or Valve Bronze Ca
14、stings ASTM B62 - Standard Specification for Composition Bronze or Ounce Metal Castings Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12125H 4 ASTM B140/B140M - Standard Specification for Copper-Zinc-Lead (Leaded Red Brass or Hardware Bronz
15、e) Rod, Bar, and Shapes ASTM B371 - Standard Specification for Copper-Zinc-Silicon Alloy Rod ASTM B584 - Standard Specification for Copper Alloy Sand Castings for General Applications (Copies of these documents are available from www.astm.org or ASTM International, P.O. Box C700, West Conshohocken,
16、PA 19428-2959.) SAE INTERNATIONAL SAE HS1086 - Numbering Metals and Alloys Recommended Practice SAE J461 - Wrought and Cast Copper Alloys (Copies of these documents are available from www.sae.org or SAE Customer Service, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.3 Order of precedence. Un
17、less otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been
18、 obtained. 3. REQUIREMENTS 3.1 First article. Unless otherwise specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Material. Material shall be as specified herein. Materials not specified shall be selected by the contractor and shall be subject to
19、 all provisions of this specification (see 4.4.1 and 4.4.2). 3.2.1 Material deterioration prevention and control. The valves shall be fabricated from compatible materials, inherently corrosion resistant or treated to provide protection against the various forms of corrosion and deterioration that ma
20、y be encountered in any of the applicable operating and storage environments to which the valves may be exposed. The selected materials and processes shall meet all of the performance and environmental specifications herein (see 4.4.1 and 4.4.2). 3.2.1.1 Dissimilar metals. Dissimilar metals shall no
21、t be used in intimate contact with each other unless protected against galvanic corrosion (see 4.4.1 and 4.4.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12125H 5 3.2.1.2 Recycled, recovered, or environmentally preferable materials. Re
22、cycled, recovered, or environmentally preferable materials shall be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs (see 4.4.1 and 4.4.2). 3.3 Design and construction
23、. Unless otherwise specified herein, the valve shall conform to the manufacturers design and construction (see 4.4.1 and 4.4.2). As a minimum the following overall requirements shall be incorporated: a. Quick opening. b. Sliding-spindle gate with: 1. Solid wedge. 2. Single or double disk; Actuated b
24、y a lever mechanism. 3. Lever mechanism shall lock the valve open in any desired position. c. Area of flow through the valve shall not be less than the area of the nominal pipe size of the valve. d. Exception to c; for valves with seat rings having lugs for insertion and removal of rings, the area s
25、hall not be reduced by more than 30 percent (%). e. The disk shall not jam and internal parts shall not be damaged by rapid and/or forceful lever operation. 3.3.1 Valve body and bonnet. The valve body and bonnet shall be cast iron conforming to ASTM A126, class B or C. The joint between the body and
26、 bonnet shall be flanged, gasketed, and bolted. Saddle-type U-bolts shall not be used to secure the bonnet. Yokes shall be cast integrally with the bonnet or flange connected to the bonnet. Disk guides shall be cast integrally with the body and formed to support disks in all positions (see 4.4.1 and
27、 4.4.2). 3.3.2 External working parts. External working parts shall be malleable iron conforming to ASTM A47/A47M, ductile iron conforming to ASTM A536, grade 65-45-12, or cupola malleable iron conforming to ASTM A197/A197M (see 4.4.1 and 4.4.2). 3.3.3 Seat rings. Seat rings shall be bronze conformi
28、ng to either ASTM B61 or ASTM B62. The seat rings shall be secured in the body by threaded connections to permit removal and replacement of the rings (see 4.4.1 and 4.4.2). 3.3.4 Disks. Disks shall be bronze conforming to either ASTM B61 or ASTM B62, or shall consist of a cast-iron disk, faced with
29、bronze disk rings. The disk rings shall be bronze conforming to ASTM B61 or ASTM B62, and shall be permanently secured to the disk by rolling into accurately machined, dovetailed slots, or by equivalent means. Disks shall be equipped with integral guides to mate with guides cast in the body (see 4.4
30、.1 and 4.4.2). 3.3.5 Stems. Stems shall be any copper alloy listed in table IV (see 4.4.1 and 4.4.2): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12125H 6 TABLE IV. Stem materials. Specification UNS number 1/ ASTM B21/B21M ASTM B61 ASTM B
31、62 ASTM B140/B140M ASTM B371 ASTM B584 SAE J461 C46400, C48200 C92200 C83600 C31600, C32000 C69400, C69700 C86400, C86700, C87400, C87500, C87600 C67500 1/ Unified Numbering System (UNS) designation for wrought and cast copper alloys, in accordance with SAE HS1086. 3.4 Working and hydrostatic pressu
32、re. Valves shall withstand a working pressure of not less than 200 pounds per square inch (psi) (1380 kilopascals (kPa) for water, oil, or gas at temperatures up to 1505 F (65 3 C), and a hydrostatic shell pressure test of not less than 350 psi (2410 kPa). Leakage shall not exceed .6 cubic inches (i
33、n3) (10 cubic centimeters (cc) per hour per inch (25.4 mm) of diameter (see 4.4.1, 4.4.2 and 4.4.3.1). 3.5 Style A - threaded. The inlets and outlets of style A valves shall have internal NPT (FNPT) threads in accordance with ANSI/ASME B1.1. The threads shall be concentric with the axis of the port,
34、 and variations in alignment shall not exceed 0.062 in. (1.6 mm) per foot. Threads shall be chamfered at the valve inlet and outlet near the major diameter of the thread at an angle of 45 degrees with the axis of the thread. The chamfer shall be concentric with the thread (see 4.4.1 and 4.4.2). 3.6
35、Style B - flanged. Flanged valves shall be faced and drilled in accordance with ASME B16.1 (see 4.4.1 and 4.4.2). 3.7 Human factors engineering (HFE). A force of not more than 20 pounds (lb) 10 kilograms (kg), using one hand, shall be required to open or close the valve at maximum operating pressure
36、. The valve shall be labeled “OPEN” and “CLOSE” with a double headed arrow indicating direction (see 4.4.1 and 4.4.2). 3.8 Treatment and painting. The outside portions of the valve normally painted shall be cleaned, treated, and painted in accordance with the manufacturers standard practice for gate
37、 valves. Unless otherwise specified (see 6.2), the top coat color shall be camouflage green (see 4.4.1 and 4.4.2). 3.9 Identification marking. Unless otherwise specified (see 6.2), the valves as a minimum shall be identified and marked with the following (see 4.4.1 and 4.4.2): a. Manufacturer and Pa
38、rt No. (see 1.3) b. Manufacturer Serial No. c. Specification No. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12125H 7 d. Working Pressure. 3.10 Workmanship. The valve shall be cleaned of loose metal chips and other foreign material before
39、 and after final assembly. Burrs, sharp edges, and excess flash on cast parts shall be removed. Threaded parts shall be smooth and free of metal chips and burrs (see 4.4.1 and 4.4.2). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as fo
40、llows: a. First article valve inspection (see 4.2). b. Conformance inspection (see 4.3). 4.2 First article valve inspection. 4.2.1 Examination. The first article valve shall be examined as specified in 4.4.2. Presence of any defects shall be cause for rejection. 4.2.2 Test. The first article valve s
41、hall be tested as specified in 4.4.3. Failure of the test shall be cause for rejection. 4.3 Conformance inspection. 4.3.1 Sampling. Sampling for examination and test shall conform to ANSI/ASQC Z1.4. 4.3.2 Examination. 4.3.2.1 Individual. Each valve shall be examined for the critical defects specifie
42、d in 4.4.2. Presence of any defects shall be cause for rejection. 4.3.2.2 Samples. Samples selected in accordance with 4.3.1 shall be examined as specified in 4.4.2. Evidence of any defect shall be cause for rejection. 4.3.3 Test. 4.3.3.1 Samples. Samples selected in accordance with 4.3.1 shall be t
43、ested as specified in 4.4.3. Failure of any test shall be cause for rejection. 4.4 Method of inspection. 4.4.1 Materials and design. Conformance to 3.2 through 3.10 shall be determined by inspection of contractor records providing proof or certification that materials and design Provided by IHSNot f
44、or ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-12125H 8 conform to requirements. Applicable records shall include drawings, specifications, design data, receiving inspection records, processing and quality control standards, vendor catalogs and certifications,
45、industry standards, test reports, and rating data. 4.4.2 Examinations. Conformance to 3.2 through 3.10 shall be determined by examination for the defects listed in table V. Examination shall be visual, tactile or by measurement with SIE. TABLE V. Classification of defects. Category Defect Method of
46、examination Major: 101 Materials not as specified (see 3.2). Visual 102 Materials not resistant to corrosion and deterioration, or treated to be resistant to corrosion and deterioration, for the applicable storage and operating environments (see 3.2.1). Visual 103 Dissimilar metals, as defined, are
47、not effectively insulated from each other to meet all requirements (see 3.2.1.1). Visual 104 Used, rebuilt or remanufactured components, pieces, or parts incorporated in the valves (see 3.2.1.2). Visual 105 Locking mechanism not as specified (see 3.3). SIE 1/ 106 Flow passage not as specified (see 3
48、.3). Visual 107 Valve body and bonnet not as specified (see 3.3.1). SIE 108 External working parts not as specified (see 3.3.2). SIE 109 Seat rings not as specified (see 3.3.3). Visual 110 Disks not as specified (see 3.3.4). Visual 111 Stems not as specified (see 3.3.5). Visual 112 Holes in casting
49、(see 3.5). Visual 113 Style not as specified (see 3.5 and 3.6). Visual 114 Threads or flanges not as specified (see 3.5 and 3.6). SIE 115 Human factors engineering not as specified (see 3.7). SIE and Visual 116 Treatment, painting, or color not as specified (see 3.8). Visual 117 Identification marking missing, incomplete, or not as specified (see 3.9). Visual 118 Workm
