1、_ .- MIL-D-3OL33B L12 W 7777706 O233630 7 m MILITARY SPECIFICATION DISKS, INLET VALVE MIL-D-l0131B( EA) 18 October 1974 SUPERSEDING MIL-D-l0131A( MU ) 24 July i967 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification cov
2、ers one type and two sizes of natural rubber valve disks. 2. APPLICABLE DOCUMENTS 2.1 Government documents, The following documents of the issue in effect on date of invitation for bids or request for proposal form 8 part of this specification to the extent specified herein: STANDARDS FEDERAL FED-SP
3、D-123 - Marking for Domestic Shipment (Civil Agencies). FED-m-601 - Rubber: Sampling and Testing. MILITARY MIL-S“D-105 - Sampling Procedures and Tables for Inspection by Attributes. DRAWINGS US ARMY ARMAMENT COMMAND EDGEWOOD ARSENAL B5-2-53 5 - Mounting, Canister. A5-2-537 - Disk, Inlet Valve. - Dis
4、k, Inlet Valve. A5-3-95 A5-3-450 - Seat, Inlet Valve. FSC 4240 - .- I ? THIS DOCUMENT CONTAINS PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_. - I MIL-D-LO131B 42 7999906 0231631 O L ni-i0131 (EA) DL136-14-170-4 - Tester, Air Leakage, Flow
5、me, Q211. DL136-14-170-5 - Tester, Air Leakage, Flow Type, 8211. DL36-44-14 - Indicator , Inlet and Outlet Valve Resist- DLi36-44-14 - Indicator, Inlet and Outlet Valve Resist- ance, Q212. ance, Q212. (Copies of specifications, standards , drawings , and publications re- quired by suppliers in conne
6、ction with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on
7、 date of invitation for bids or re- quest for proposal shall apply. AMERICAN SOCIETY FOR TESTING AND MATERIALS ASTM STANDARDS D572-67 - Accelerated Aging of Vulcanized Rubber by the Oxygen- Pressure Method. (Application for copies of ASTM Standards should be addressed to the American Society for Tes
8、ting and Materiais, 1916 Race Street, Philadel- phia, PA 19103 ) 3. REQUIREMENTS 3.1 Material. 3.1.1 Rubber compound. The rubber compound used in the manufacture of the sheet stock shall contain not less than 92 percent, by volume, of new natural rubber. 3.1.2 Antioxidants and accelerators. The supp
9、lier shall furnish a certificate stating the trade names, the manufacturers, and the amount of the antioxidants and the accelerators used in compounding the stock. 3.2 Manufacture. The disks shall be manufactured from the molded sheet stock in accordance with the applicable drawing listed in 2.1. 3.
10、2.1 Color. The color of the disks shall be as specified in the contract or order. (See 6.2. ) 2 i I , _ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-l0131B( EA) 3.3 Flexibility. When assembled to the appropriate valve seat the disks shall co
11、nform to the entire valve seat surface and shall not fail. away at any point from the seat regardless of the position in which the seat is held. 3.4 Phy sicd properties. Physical properties of the sheet stock shall conform to the requirements of table I when tested as specified therein. Table I. Phy
12、sical properties :After heat: Test : : Property :Unaged: aging :paragraph: : Average tensile strength, psi, min : 2600 : : 4.2.4.2 : : Percent decrease, mu : 25 : Average ultimate elongation, %, min * : 650 : : 4.2.4.2 : : Percent decrease, max : 25 . : Average tension set at 600% elongation, : Xmax
13、 : 15 : : 4.2.4.2 : : : Percent increase, rnax 20 : Percent increase, max . 20 : 3.5 Leakage. When assembled to the appropriate valve seat the disks shall not leak more than 250 milliliters of air per minute at a pressure differential of 25 millimeters of water when tested as specified in 4.2.4.3. 3
14、.6 Airflow resistance. When assembled to the appropriate valve seat the disks shall have a resistance not to exceed a pressure differen- tial of 5 millimeters of water for the A5-3-95 disk and 6 millimeters of water for the A5-2-537 disk at an airflow rate of 85 liters per minute when tested as spec
15、ified in 4.2.4.4. 3.7 Workmanship. The disks shall have a smooth finish on both sides; shall have clean cut peripheral and hole edges; and shall be free from tackiness, imperfections, such as porous areas, cracks, checks, abrasions and blisters, foreign matter (grease, oil , dirt, or ash), and damag
16、e, such as tears, slits a& ptmctumes. 3.8 Resistance to oxygen-pressure aging. Valve disks shall show no cracking or increased hardness or tackiness after 72 hours of acceler- ated aging in oxygen, at a pressure of 2100 +i00 Kilonewton per square meter and a temperature of 70 - + 1 C, when tested as
17、 specified in 4.2.4.5 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-LO33LB 42 777770b 0233633 4 W MIL-D-l131B(EA) 4. QALITY ASCURCMCE PROVISIONS 4 .l Responsibility for inspection. 4.1*1 Suppliers responsibility. Unless otherwise specified
18、in the contract or purchase order, the supplier is responsible for the per- formance of all inspection requirements as specified herein. Ekcept as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection require
19、ments specified herein, unless disapproved by the Government. inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to specified requirements . The Government reserves the right to perfom any of the 4.1.2 Objective evidence. Th
20、e supplier shall provide objective evidence acceptable to the contracting officer that the requirements of 3.1 and section 5 for which specific inspection has not been provided in this specification have been satisfied, 4.2 Quality conformance inspection. 4.2.1 Lotting. A lot shall consist of the di
21、sks of one size produced by one manufacturer from one batch (see 6.4) of raw materials and man- ufactured under essentially the same mmufacturing conditions. 4.2.2 Sampling. 4.2.2.1 For examination and nondestructive tests. Sampling shall be conducted in accordance with MIL-STD-105. 4.2.2.2 For dest
22、ructive tests. Sheet stock produced in accordance with 3.1 shall be taken for the tests, 4.2.3 Examination. 4.2.3.1 For nondestructive tests. Sample disks shall be examined and tested in accordance with the classification of defects and with MIL-STD-105 4.2.3.2 accordance For destructive tests. with
23、 4.2.4.2. The specimens shall be tested in The acceptance number is zero, 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-D-l0131B( EA) 4.2.3.3 Classification of defects, (a) Valve disks (see applicable dwg for size). Categories Defects Critica
24、l : None defined Major: AQL 1.0 percent defective *lo1 102 103 i04 105 i06 107 i08 109 Minor : 201 202 Leakage Airflow re si st ance AQL 2.5 percent defective Flexibility (3.3 !Thickness incorrect Center hole location Center hole diameter Disk diameter incorrect Tackiness Workmanship (3.7 ) incorrec
25、t incorrect AQTi 4 .O percent defective Color incorrect Finish incorrect Accept ance st andards 4.2.4.3 4.2.4.4 *For prime procurement only. 4.2.4 Tests, 4.2.4.1 Preparation of test specimens. Specimens shall be prepared from the molded sheet stock (4.2.2.2) as specified in FED-STO-601. _- _ Specime
26、ns shall not be buffed or stretched before testing. Specimens shall be prepared for each test in the numbers indicated in table II. The test specimens selected for heat aging shall be aged in an oven at a temperature of i58O 5 1.8OF. for a continuous period of 168 t 1 hour. 5 Provided by IHSNot for
27、ResaleNo reproduction or networking permitted without license from IHS-,-,-_. MIL-D-LOL33B 42 7977706 0233635 MIL-D-l0131B( EA) Table II. Number of specimens for various tests Test Specimens : Unaged Aged : Tensile strength 10 10 : Ultimate elongat ion 10 10 * : Tension set 6 - 4.2.4.2 Physical prop
28、erties tests. Tensile strength, ultimate elong- ation, tension set, shall be determined as specified in FED-STD-601. 4.2.4.3 Leakage, The valve disks shall be tested for leakage using Q,211 flow type air leakage tester after they are assembled as follows: Inlet valve disk (Dwg A5-3-95)-Assemble to i
29、nlet valve seat, Inlet valve disk (Dwg A5-2-537)-Asseable to canister mounting, 5-3-450, and test using DLl36-14-170-5. 5-2-535 , and test using DL136-14-170-4. 4.2.4.4 Airflow resistance. The valve disks shall be tested for airflow resistance using Q212 inlet and outlet valve resistance indicator a
30、fter they are assembled as follows: Inlet valve disk (Dwg A5-3-95)-Assemble to inlet valve seat, Inlet valve disk (Dwg A5-2-537)-Assemble to canister mounting , 5-3450, and test using DLi36-44-1-5. 5-2-535, and test using DLi36-44-1-6. 4.2.4.5 Resistance to oxygen-pressure aging. Valve disks shall b
31、e tested in accordance with ASTM D572. 5. PREPARATION FOR DELIVERY 5.1 Packaging, packing and marking, interplant shipment (see 6.5). The disks shall be packaged and packed to provide adequate protection from the supply source to the first receiving activity for immediate use or further processing.
32、Shipping containers shall comply with the rules and regulations applicable to the mode of transportation. ing on shipping containers shall be in accordance with FED-STD-123 and shall include the name and address of the prime contractor and contract number. Mark- 5.2 Repair parts. When this item is b
33、eing procured for storage and issue as a repair part, preservation, packaging, packing, and marking shall be as specified on the repair parts packaging data sheet which is identified by its National Stock Number. 6 I Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
34、e from IHS-,-,-MIL-D-10131B ( EA) 6. NOTES 6.1 Intended use, These disks are intended for use in canisters and canister mountings. 6.2 Ordering data. Procurement documents should specify the following : (a) (b) Color of disks. (c ) Applicable drawings. (d) Title, number, and date of this specificati
35、on. Applicability of leakage test (see 4.2.3.3). 6.3 Valve seats. Valve seats required for conducting airflow resist- ance and leakage tests will be furnished by the Government. 6.4 - Batch. A batch is defined as that quantity of material which has been manufactured by some unit chemical process and
36、 subjected to some physical mixing operation intended to make the final product substantially uniform. 6.5 Interplant shipments. Packaging for supplies and materials which will not enter the military supply system. Typical interplant shipments are shipments from a vendor to-a subcontractor or a prim
37、e contractor, or from a.subcontractor to a prime contractor, or from a vendor or con- tractor to a military arsenal or plant. 6.6 international interest. Certain provisions of this specification are the subject of international standardization agreement QSTAG 216. When amendment, revision, or cancel
38、lation of this specification is proposed which will affect or violate the international agreement con- cerned, the preparing activity will take appropriate reconciliation action through international standardization channels including depart- mental standardization offices, if required. Custodian: Preparing Activity: Project No, 4240-A479 * U. S. GOVERNMENT PRINTING OFFICE: 1974-603-1 12/3 112 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
