1、 INCH-POUND MIL-DTL-27166F 6 December 2013 SUPERSEDING MIL-DTL-27166E 8 August 2008 DETAIL SPECIFICATION VALVE, PRESSURE EQUALIZING, GASEOUS PRODUCTS This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers low
2、 pressure equalizing, gaseous product valves for use in shipping containers. 1.2 Classification. Unless otherwise specified, relief valves are of the following types and reseal pressures (see 6.2). TYPE I Vacuum relief Reseal pressure psi (3.4 kPa) Reseal pressure 1 psi (6.9 kPa) Reseal pressure 2 p
3、si (13.8 kPa) Reseal pressure 3 psi (20.7 kPa) Beneficial Comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this document should be sent to: AF Packaging Technology or http:/www.wpafb.af.mil/units/afptef/index.asp/ . Since contact information can b
4、e changed, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil/ . AMSC N/A FSC 4820 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.Provided by IHSNot for ResaleNo reproduction or networking permit
5、ted without license from IHS-,-,-MIL-DTL-27166F 2 TYPE II Pressure relief Reseal pressure psi (1.7 kPa) Reseal pressure psi (3.4 kPa) Reseal pressure 1 psi (6.9 kPa) Reseal pressure 2 psi (13.8 kPa) Reseal pressure 3 psi (20.7 kPa) Reseal pressure 5 psi (34.5 kPa) TYPE III Pressure and vacuum relief
6、 Reseal pressures psi (3.4 kPa) pressure, psi (3.4 kPa)vacuum Reseal pressures 1 psi (6.9 kPa), psi (3.4 kPa) vacuum Reseal pressures 1 psi (6.9 kPa), 1 psi (6.9 kPa) vacuum Reseal pressures 1 psi (10.4 kPa) pressure, 1 psi (10.4 kPa) vacuum Reseal pressures 2 psi (13.8 kPa) pressure, 1 psi (6.9 kPa
7、) vacuum Reseal pressures 2 psi (13.8 kPa) pressure, 2 psi (13.8 kPa) vacuum Reseal pressures 3 psi (20.7 kPa) pressure, 2 psi (13.8 kPa) vacuum Reseal pressures 5 psi (34.5 kPa) pressure, 2 psi (13.8 kPa) vacuum 2. APPLICABLE DOCUMENTS 2.1 General The documents listed in this section are specified
8、in sections 3 and 4 of this specification. This section does not include documents cited in other sections 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
9、must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the exte
10、nt specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-H28 Screw-Thread Standards for Federal Services COMMERCIAL ITEM DESCRIPTIONS A-A-59588 Rubber, Silicone Provided by IHSNot for ResaleNo reproducti
11、on or networking permitted without license from IHS-,-,-MIL-DTL-27166F 3 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests MIL-STD-889 Dissimilar Metals MIL-STD-1916 DoD Preferred Met
12、hods for Acceptance of Product MIL-STD-31000 Technical Data Packages (Copies of these documents are available online at http:/quicksearch.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia PA 19111-5094.) 2.3 Non-Government publications. The follo
13、wing documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASME INTERNATIONAL ASME Y14.5 Dimensioning and Tolerancing (Copies of this document are available at www.asme.org or
14、ASME International P.O. Box 2300, Fairfield NJ 07007-2300. ASTM INTERNATIONAL ASTM D3951 Standard Practice for Commercial Packaging ASTM D999 Standard Test Methods for Vibration Testing of Shipping Containers (Copies of this document are available at www.astm.org or ASTM International, 1916 Race Str
15、eet, Philadelphia, PA 19103-1137.) 2.4 Order of precedence. Unless 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 applic
16、able laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.3. 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
17、 or environmentally preferable materials should 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. Provided by IHSNot for ResaleNo reproduction or networking permit
18、ted without license from IHS-,-,-MIL-DTL-27166F 4 3.2.1 Commercial parts. Commercial parts having suitable properties may be used where, on the date of invitation for bids, there are no suitable standard parts. In any case, commercial utility parts, such as screws, bolts, nuts, and cotter pins, havi
19、ng suitable properties may be used provided: a. They can be replaced by the standard parts (AN or MS without alteration). b. The corresponding standard part numbers are referenced in the parts list and, if practicable, on the contractors drawings. 3.2.2 AN and MS standard parts. With the exception s
20、pecified in 3.2.1, AN and MS standard parts shall be used where they suit the purpose. They shall be identified on the drawings by their part numbers. 3.2.3 Part numbering of interchangeable parts. All parts having the same manufacturers part number shall be functionally and dimensionally interchang
21、eable. The item identification and part number requirements of MIL-STD-31000 (see 6.2) shall govern manufacturers part numbers and changes thereto. 3.3 Materials. All materials shall be as specified herein. Materials not specified shall be of the best quality used for the purpose in commercial pract
22、ice. The materials shall be free from all defects or imperfections that might affect the serviceability of the finished product. Recovered or recycled materials may be used provided the end product is capable of passing the first article tests. 3.3.1 Metals. Metals shall be of the corrosion-resistan
23、t type or suitably treated to resist corrosion or atmospheric conditions likely to be met in storage or normal service. MIL-STD-889 shall be utilized to determine compatibility of metals from which the valves are fabricated. 3.3.2 Protective treatment. When materials used in the construction of the
24、valves are subject to deterioration when exposed to climatic and environmental conditions likely to occur during service usage, they shall be protected against such deterioration in a manner that will in no way prevent compliance with the performance requirements of this specification. The use of an
25、y protective coating that will crack, chip, or scale with age or extremes of climatic and environmental conditions shall be avoided. Protective treatments used shall be non-hazardous and-environmentally safe. 3.3.3 Non-metals. When utilized, non-metallic parts such as packings, interior gaskets, and
26、 valve seats shall be of the oil-resistant type. 3.3.4 Exterior gaskets. Exterior gaskets for sealing valves to the container shall be made of silicone rubber conforming to A-A-59588 class 2 or 3, grade 60. No additional sealing material shall be required. 3.4 Construction. 3.4.1 Gasket seat. Unless
27、 otherwise specified, valves employing exterior gaskets shall be provided with a groove to retain and seat such gaskets. The depth of the groove shall not be less than 50 percent nor more than 70 percent of the original gasket thickness. Provided by IHSNot for ResaleNo reproduction or networking per
28、mitted without license from IHS-,-,-MIL-DTL-27166F 5 3.4.2 Castings. When used, castings shall be of high quality, clean, sound, and free of blow-holes, porosity, cracks, and other defects which may adversely affect the valve performance. 3.4.3 Valve body. Unless specifically approved by the procuri
29、ng agency, non-metallic materials shall not be used in the construction of the valve body. 3.4.4 Mounting devices. Unless otherwise specified, each valve shall be provided with a nut, washer, and gasket or other suitable device for installation purposes. 3.5 Design. 3.5.1 Maintenance. The design of
30、the valve shall be such that installation and removal from containers may be accomplished with common hand tools. 3.5.2 Special features. Special features, such as manual relief devices to permit equalization of pressure prior to opening the container or filters to limit the entrance of sand or dust
31、, may be used provided they do not interfere with the other requirements of this specification. 3.5.3 Lubrication. The design of the valve shall be such that lubrication shall not be required for operation during the service life. 3.5.4 Screw threads. All screw threads shall be in accordance with FE
32、D-STD-H28, class 2. 3.5.5 Locking of parts. All internal and external threaded parts shall be locked. 3.5.6 Pipe threads. Pipe threads shall be in accordance with FED-STD-H28. 3.5.7 Dimensions. Dimensions and tolerances shall be in accordance with ASME Y14.5. Where dimensions and tolerances may affe
33、ct interchangeability, consistent operation, or performance of the valve, they shall be limited accordingly. 3.5.8 Weight and size. Weight and size of the valve shall be as small as possible consistent with the requirements specified herein and with sound engineering practices. 3.6 Performance. 3.6.
34、1 Reseal. The valve reseal pressure shall be specified by the using activity (see 6.2). The specified reseal pressure establishes a lower limit by which the valve must be closed. The valve shall not leak at a rate of 0.061 cubic inch (1 cubic centimeter) of standard air per minute or more in the flo
35、w Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27166F 6 direction at the specified reseal pressure when tested as specified in 4.6.1.2. The actual reseal pressure will be equal to or greater than the specified reseal pressure. 3.6.1.1 Leak
36、age. Types I and II valves shall not leak at a rate of 0.061 cubic inch (1 cubic centimeter) of standard air per minute or more in the reverse flow direction at a pressure differential of 10 psi (68.9 kPa) when tested as specified in 4.6.1.2. 3.6.2 Cracking. The valve cracking pressure shall be grea
37、ter than the specified reseal pressure by a value that is within the pressure offset range specified below. The valve cracking pressure offset range is determined by the specified reseal pressure. Specified Reseal Pressure Range Cracking Pressure Offset Range 0.00 1.00 psi (0.0 6.9 kPa) 0.00 0.50 ps
38、i (0.0 3.4 kPa) 1.01 1.50 psi (6.9 10.4 kPa) 0.00 0.75 psi (0.0 5.2 kPa) 1.51 3.00 psi (10.4 20.7 kPa) 0.00 1.00 (0.0 6.9 kPa) psi 3.01 psi and greater (20.8 kPa and greater) 0.00 1.50 psi (0.0 10.3 kPa) 3.6.3 Minimum flow rate. The valve minimum flow rate shall be specified by the using activity (s
39、ee 3.6.3.1 and 6.2). When tested as specified in 4.6.1.2, the valve minimum flow rate shall be determined at a differential pressure of 1.5 psi (10.3 kPa) greater than the specified reseal pressure in the flow direction. 3.6.3.1 Minimum flow rate calculations. Calculations shall be made as follows,
40、by the valve using activity, to determine the minimum flow rate required to protect the container (see 6.2): Minimum flow rate ft3/minute (m3/minute) = (Vc Vm) 0.12 Where: Vc = Volume of container ft3 (m3) Vm = Volume of material in container ft3 (m3) 3.6.4 Operating life. The valves shall withstand
41、 2500 cycles at ambient conditions from the closed position to the open position for either or both positive and negative pressure differentials, as applicable for the type concerned. 3.6.5 Environmental tests. The valves shall be capable of withstanding the following environmental conditions when t
42、ested as specified in 4.6.3. 3.6.5.1 Temperature. The valves shall be capable of withstanding without degradation of performance attributes, temperatures ranging from -80 to +160 F (-62 to +71 C) during operation and nonoperation. Provided by IHSNot for ResaleNo reproduction or networking permitted
43、without license from IHS-,-,-MIL-DTL-27166F 7 3.6.5.2 Humidity. The valves shall be capable of withstanding, without degradation of performance attributes, relative humidity up to 95 percent at 160 F (71 C) during operation and nonoperation. 3.6.5.3 Vibration. The valves shall be capable of withstan
44、ding, without degradation of performance attributes, vibration incident to service use during operation and nonoperation. 3.6.5.4 Sand and dust. The valves shall be capable of withstanding, without degradation of performance attributes, sand and dust particles encountered in desert areas during oper
45、ation and nonoperation. 3.6.5.5 Rough handling. The valves shall be capable of withstanding, without degradation of performance attributes, rough handling which may be encountered during shipping and service life. 3.6.5.6 Salt fog. The valves shall be capable of withstanding, without degradation of
46、performance attributes, exposure to salt atmosphere as encountered in coastal areas. 3.7 Identification of product. The valves shall be marked for identification in accordance with MIL-STD-130. 3.8 Workmanship. All parts of each valve shall be constructed and finished in accordance with good commerc
47、ial practice. Particular attention shall be given to the machining of mating parts, finish of sealing surfaces, freedom of parts from burrs and sharp edges, and the removal of chips and other foreign material prior to and after assembly. 4. VERIFICATION 4.1 Classification of inspections. The inspect
48、ion requirements specified herein are classified as follows: a. First article inspection (see 4.3). b. Conformance inspection (see 4.4). 4.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed in accordance with the test conditions specified in 4.5. 4.3 First articl
49、e inspection. When specified, in the contract or purchase order, first article inspection shall be performed by the contractor, after award of contract and prior to production, at a location acceptable to the Government. First article inspection (see table I) shall be performed on sample units which have been produced with equipment and procedures normally used
