1、MIL-A-24780 9999906 L4B9646 T93 = INCH - POUND MIL-A-24780(SH) 30 October 1992 MILITARY SPECIFICATION ACTUATING ASSEMBLY, SINGLE LINEAR MOTION, FOR THE REMOTE ACTUATION OF QUICK ACTING VALVES, GENERAL SPECIFICATION FOR This specification is approved for use by the Naval Sea Systems Command, Departme
2、nt of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 ScoDe. This specification covers the requirements for a mechanical assembly used to apply a force through a single linear motion from a remote location for actuating quick acting valve
3、s. core mechanism, a valve end fitting, core junction boxes, and trip handles (see figure 1). Assemblies covered by this specification should be furnished in one class meeting the requirements specified herein. The assembly consists of an encased 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1
4、.1 Specifications. standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specification
5、s and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 05442, Department
6、of the Navy,2531 National Center Bldg 3, Washington, DC 20362-5160 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. PASC N/A FSC 4820 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unl
7、imited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-24780 m 9Ob 1487647 2T m s SPECIFICATIONS FEDERAL QQ-C-320 QQ-C-390 QQ-N-281 QQ-S-763 RR-W-410 PPP-B - 621 PPP-B - 6 36 MILITARY MIL- P - 116 MIL-S-901 DOD-G-21508 MIL-G-46886 MIL-C-81751
8、STANDARDS MILITARY MIL-STD-129 - Chromium Plating (Electrodeposited). - Copper Alloy Castings (Including Cast Bar). - Nickel-Copper Alloy Bar, Rod, Plate, Sheet, Strip, Wire, Forgings, and Structural and Special Shaped Sections. Resisting. - Steel Bars, Wire, Shapes, and Forgings, Corrosion - Wire R
9、ope and Strand. - Boxes, Wood, Nailed and Lock-Corner. - Boxes, Shipping, Fiberboard. - Preservation, Methods of. - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for. - Grease, High Performance, Multi-Purpose. (Metric) - Grease, Silicone. - Coating, Metall
10、ic-Ceramic. - Marking for Shipment and Storage. MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited). for the Selection of. MIL-STD-970 - Standards and Specifications, Order of Preference (Unless otherwise indicated, copies of federal
11、 and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, BLDG. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.2 Non-Government Dublications. The following document(s) form a part of this document to the extent specified herein. issu
12、es of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). Unless otherwise specified, the 2 Provide
13、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-Ao24780 0b L48bY8 8bb W AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 27 - Standard Specification for Steel Castings, Carbon, for A 227 - Standard Specification for Steel Wire, Cold-Drawn for A 228
14、 - Standard Specification for Steel Wire, Music Spring A 229 - Stanard Specification for Steel Wire, Oil-Tempered for A 269 - Standard Specification for Seamless and Welded Austenitic General Application. (DoD adopted) Mechanical Springs. (DoD adopted) Quality. (DoD adopted) Mechanical Springs. (DoD
15、 adopted) Stainless Steel Tubing for General Service. (DoD adopted) Steel Bars and Shapes. (DoD adopted) Alloy . (Galvanized) by the Hot-Dip Process, Lock-Forming Quality. (DoD adopted) Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements for. (DoD adopted) and Shapes for Use in Scr
16、ew Machines. (DoD adopted) Shapes. (DoD adopted) (DoD adopted) Strip, and Rolled Bar. (DoD adopted) Zinc on Iron and Steel. (DoD adopted) Molding and Extrusion Materials. Extrusion Materials. (DoD adopted) A 276 - Standard Specification for Stainless and Heat-Resisting A 494 - Standard Specification
17、 for Castings, Nickel and Nickel A 527 - Standard Specification for Steel Sheet, Zinc-Coated A 568 - Standard Specification for Steel, Sheet, Carbon, and High- B 16 - Standard Specification for Free-Cutting Brass Rod, Bar, B 21 - Standard Specification for Naval Brass Rod, Bar, and B 26 - Standard S
18、pecification for Aluminum-Alloy Sand Castings. B 121 - Standard Specification or Leaded Brass Plate, Sheet, B 633 - Standard Specification for Electrodeposited Coatings of D 1457 - Standard Specification for Polytetrafluoroethylene (PTFE) D 2116 - Standard Specification for FEP-Fluorocarbon Molding
19、and D 3951 - Standard Practice for Commercial Packaging. (DoD adopted) D 4066 - Standard Specification for Nylon Injection and Extrusion (DoD adopted) Materials (PA). (DoD adopted) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philad
20、elphia, PA 19103.) AMERICAN PETROLEUM INSTIlJTE (API) STD 607 - Fire Test for Soft-Seated Quarter-Turn Valves. (DoD adopted) (Application for copies should be addressed to the American Petroleum Institute, 1220 L Street, NW, Washington, DC 20005.) (Non-Government standards and other publications are
21、 normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services. ) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-24380 999990
22、6 1489649 7T2 . 2.3 Order of precedence. 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 obtain
23、ed. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.5) in accordance with 4.3. 3.2 Reliability. The assemblies shall be designed and constructed with reliability as a paramount consideration. be based on breaking strength, e
24、ndurance, and ability to withstand the environment. meeting the requirements in 3.2.1 through 3.2.3. The suitability of the assembly shall Verification of suitability shall be achieved by successfully 3.2.1 Breakinn strenrtth. The assembly components which transmit the valve actuation force shall ha
25、ve a breaking strength of at least five times the working load (see 4.7.1). 3.2.2 Endurance. The assemblies shall operate for 10,000 cycles (see 4.7.2). 3.2.3 Environment. The assemblies shall operate in a marine environment under the following ambient conditions: (a) Temperature range of minus 40 t
26、o plus 140 degrees Fahrenheit (OF). (b) Pressure range of 28 to 32 inches of mercury (Hg) absolute. (c) Relative humidity of O to 100 percent. The assemblies furnished shall be subjected to a temperature soak test (see 4.7.3). 3.3 Materials. The assembly materials shall be as specified in table I (s
27、ee 6.7). Materials not specified shall be suitable for the intended use and may be selected in accordance with MIL-STD-970. 3.3.1 Recovered materials. Unless otherwise specified herein, all . equipment, material, and articles incorporated in the products covered by this specification shall be new an
28、d may be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, a
29、s opposed to virgin raw materials. interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified. None of the above shall be 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
30、* MIL-A-24780 m 9999906 1489b50 414 m 3.3.2 Corrosion Drotection. Steel components sha 1 be protected from the environment. corrosion resistant steel or plated with chrome or zinc in accordance with QQ-C-320. or ASTM B 633. coating in accordance with MIL-C-81751. Steel components which must be expos
31、ed to the environment shall be Chrome plating shall be Zinc plating shall be in accordance with ASTM A 527 Nonmoving components may be protected by a metallic-ceramic TABLE I. Assemblv materials. Name of part Core Material specification QQ-N-281 RR-W-410 ASTM A 227 ASTM A 276 Casing QQ-N-281 ASTM A
32、228 ASTM A 229 ASTM A 269 ASTM A 276 ASTM D 1457 ASTM D 2116 ASTM D 4066 Housings QQ-N-281 ASTM A 494 QQ- C- 390 QQ- S - 763 ASTM A 27 ASTM A 276 ASTM A 568 ASTM B 121 Handles, fittings, and coup1 ings QQ - N - 2 8 1 ASTM A 494 QQ-C-390 QQ-S-763 ASTM A 276 ASTM B 16 ASTM B 21 ASTM B 26 5 I Provided
33、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-24780 D YOb L48b5L 350 D . 3.4 Standard commercial product. Assemblies furnished may be the manufacturers standard commercial product provided the requirements specified herein are met. 3.5 Design and cons
34、truction. single linear motion) core coupled at one end to a trip handle. the core shall be coupled to the valve (during installation). trip handle shall transmit. via the core, the force and displacement necessary to trip the valve. The trip handle housing and core casing shall be suitable for moun
35、ting the assembly to ship structures (during installation). The assembly furnished shall contain the components specified in 3.7 and meet the requirements specified in 3.5.1 through 3.5.6 (see 6.3, appendix A, and appendix B). The basic assembly shall consist of a movable The other end of Actuation
36、of the 3.5.1 Trip handle safety lock. Trip handles shall contain a feature to prevent inadvertent actuation by personnel. feature shall not exceed 3 seconds (see 4.7.4). The time required to override this 3.5.2 Trip handle and core return. The assembly shall contain a spring or mechanism which retur
37、ns the actuating members (core and trip handles) to their stowed position after the assembly has been actuated and the applied force removed. 3.5.3 TriD handle actuation motion. Trip handles shall be tee handles or levers as specified (see 6.2). Unless otherwise specified (see 6.2), the displacement
38、 required at a trip handle by the operators hand to stroke the core and actuate the valve shall not exceed 10 inches for tee handles nor an arc length of 20 inches for levers. 3.5.4 Shock features. The assembly shall be constructed with a shock compensation tube allowing 4 inches of cable movement b
39、efore engaging the trip mechanism to preclude inadvertent valve trip induced by shock loads (see 3.6.1 and 4.7.5). shall be considered in the construction of the assembly. The following conditions which may cause inadvertent valve actuation (a) valve and the ship structures. (b) Any mass (for exampl
40、e, a valve end fitting) coupled to the valve actuating mechanism will increase inertial loads and reduce the shock resistance of the valve. res is tance of the system. A relative displacement as large as 4 inches may occur between the (c) Unauthorized adjustments by personnel can reduce the shock 3.
41、5.5 Assemblv couDlinps. Couplings shall be provided between the assembly components. with standard tools. Couplings shall be constructed to permit assembly and disassembly 3.5.6 Lubrication and seals. The assembly shall not require lubrication or it shall be permanently lubricated during manufacture
42、. assemblies shall contain seals to retain lubricant and prevent entry of contaminants (see 4.7.2). Lubricants shall meet the requirements of MIL-G-46886 or DOD-G-24508. Permanently lubricated 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-2
43、4780 m 999990b L489b52 297 m 3.6 Performance. The assembly shall meet the performance requirements specified in 3.6.1 through 3.6.7. 3.6.1 Mechanical shock. The assembly shall meet the high-impact shock requirements of MIL-S-901 for grade A, class I equipment (see 4.7.5). The equipment classificatio
44、n shall be hull mounted, 3.6.2 Vibration. The assembly shall meet the requirements of MIL-STD-16.7-1 for type 1 equipment (see 4.7.6). 3.6.3 Working confimration. The working configuration for the assemblies furnished may vary (see 6.2). Unless otherwise specified (see 6.2), directional changes shal
45、l be accomplished by a 90 degree bend at a radius of 12 inches. 3.6.4 Valve Darameters. The valves to be actuated by the assemblies furnished may vary in design. assemblies furnished shall be as specified (see 6.2). The valve parameters bhich interface with the 3.6.5 Actuation force. Unless otherwis
46、e specified (see 6.2). the force required at a trip handle to actuate the valve when the assembly is in the configuration specified (see 3.6.3) shall not exceed 50 pounds (see 4.7.7). 3.6.6 Orientation. The assembly shall function when placed in any orientation (see 4.7.8). 3.6.7 Fire condition, The
47、 assembly shall function during exposure to fire (see 4.7.9). 3.7 ComDonents. The components furnished shall meet the requirements specified in 3.7.1 through 3.7.5 (see figure 1 for component identification). 3.7.1 m. The term “runs“ as used herein refers to a subassembly consisting of a flexible, l
48、inear motion, inner member (the core) which may consist of, but is not limited to, a solid or stranded construction in a flexible, metallic, outer member (the casing) of solid, stranded, or interlocked construction. The casing shall be suitable for mounting the runs to the ship structure. The length
49、 of each run and the two interfacing components (that is, valve, junction box, remote trip handle, or intermediate trip handle) shall be as specified (see 6.2). as specified (see 6.2). Runs shall be provided with a valve end fitting or couplings 3.7.2 Remote trip handle. Remote trip handles are located at the ends of Each remote trip handle shall be the assembly and are coupled to a single run. provided with a housing. ship structure. The housin
