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 usarmy.detroit.rdecom.mbx.tardec-standardizationmail
2、.mil. Since contact information can change, 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 2530 DISTRIBUTION A: Approved for public release INCH-POUND A-A-52485B July 11, 2013 SUPERSEDING A-A-52485A April 6, 199
3、5 COMMERCIAL ITEM DESCRIPTION VALVE, RELAY EMERGENCY: BREAKAWAY AIR BRAKE The General Services Administration has authorized the use of this commercial item description (CID) for all federal agencies. 1. SCOPE. This CID covers air operated relay emergency valve used in vehicle air brake systems refe
4、rred to herein as relay valve. 2. SALIENT CHARACTERISTICS. 2.1 Materials. All metals used in the construction of the relay valve shall be made of corrosion resistant material or protected to resist corrosion. The use of recovered material made in compliance with regulatory requirements is acceptable
5、 providing that all requirements of this CID are met (see 3.1). 2.1.1 Dissimilar metals. Dissimilar metals shall not be used in intimate contact with each other unless protected against galvanic corrosion. 2.2 Design and construction. Unless otherwise specified in figure 1, the relay valve shall be
6、designed and constructed in accordance with the manufacturers specifications and drawings. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52485B 2 PIN no. Former MS part no. Former part no. A 52485-1 MS 53004-1 8330051, 8327378, 7979304, 7411025
7、, 8380978, 8016936, 8327581 A 52485-2 MS 53004-2 None NOTE: 1. Location of service, emergency, delivery (cylinder), reservoir, and exhaust ports optional. However, ports shall provide optimum access for connection in any of the referenced mounting positions. 2. Port thread dimensions: Service port -
8、 1/4-18 NPTF, one (1) minimum required: Emergency port (charging) - 1/4-18 NPTF, one (1) minimum required: Delivery ports (brake) - 1/4-18 NPTF, four (4) minimum required: Reservoir ports - two (2) minimum required - valve mounting pad port 3/4-14 NPTF. The other reservoir port 3/8-18 NPTF. 3. All p
9、orts, except one (1) service, one (1) emergency, and one (1) delivery port, shall be fitted with metallic dryseal (NPTF) pipe plugs. Unplugged ports shall be fitted with closures to prevent intrusion of dust and moisture, and protect the threads. 4. All designated valve ports and elbows shall be so
10、positioned to allow assembly of ninety degrees (90). 5. Dimensions are in inches (in). Tolerances are .031 unless otherwise specified. Use of an asterisk (*) indicates tolerance .005, casting dimensions shall be .062. 6. PIN number A 52485-2 is a replacement kit. FIGURE 1. Relay valve. Provided by I
11、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52485B 3 2.3 Port marking. All ports shall be clearly and permanently marked and identified to indicate the proper air line application and connection to be made. 2.4 Performance. Unless otherwise specified, per
12、formance and test requirements of the relay valve shall conform to SAE J1409 and SAE J1410. 2.5 Cracking pressure. Service line pressure required to actuate the valve allowing pressure to enter delivery line shall not be more than 5 pounds per square inch (psi). 2.6 Charging rate. The time required
13、to build up trailer reservoir (1,000 cubic inches) pressure from 0 to 65 psi shall be 7 1 second, and from 0 to 100 psi shall not be more than 30 seconds. 2.7 Pressure differential. The pressure differential between the service line pressure and the brake chamber pressure shall not be more than 5 ps
14、i at an air pressure of 50 5 psi. The air pressure in the brake chamber at all times. 2.8 Service time. The time between application of 100 psi air pressure to the service port and build up of 60 psi in the brake chamber shall be a maximum of 0.22 seconds. 2.9 Emergency application. The pressure in
15、the 75 cubic inch reservoir shall increase approximately three times the rate that the emergency line pressure decreases. The time between the start of emergency line pressure decrease and build up of 60 psi in the reservoir shall not exceed .19 seconds. 2.10 Bleed-down rate. The relay valve shall h
16、ave an automatic means to gradually reduce trailer air reservoir and brake system pressure to the atmosphere when the trailer is detached from the towing vehicle. The rate of this pressure reduction shall be between .065 standard cubic feet per minute (scfm) and .025 scfm when measured in the range
17、of 88 to 82 psig. Pressure shall be maintained for no less than 3 minutes and shall not bleed back through the supply line. 2.11 Finish. External surfaces of the valve shall be cleaned, treated and painted to provide protection against rust, corrosion, and deterioration. Color and type of paint fina
18、l top coat shall be as specified in the contract or order (see 6.2). 2.12 Identification and marking. Identification markings shall be permanent and legible and shall include as a minimum, the manufacturers identification code (CAGE) and part number, and the military part identification number (PIN)
19、 (see figure 1, 6.2 and 6.3). 2.13 Mounting. The relay valve shall be capable of mounting in the following positions: a. Direct mounted to reservoir with 3/4”-14 NPTF for pipe nipple. b. Mounted to reservoir bracket. c. Remote mounted. Provided by IHSNot for ResaleNo reproduction or networking permi
20、tted without license from IHS-,-,-A-A-52485B 4 2.14 Replacement kit. Replacement kit shall include relay valve, instructions for mounting, provisions for tank 3/4”-14 NPTF for pipe nipple, tank flange, or remote mounting plus the following fittings which shall conform to SAE J246: Quantity: (1) Adap
21、ter - 1/4 NPTF with nut and sleeve for 3/8 air line. (2) 90 elbow - 1/4 NPTF with nut and sleeve for 3/8 air line. (1) 90 elbow - 3/8 NPTF with nut and sleeve for 3/8 air line. (1) 90 elbow - 3/8 NPTF with nut and sleeve for air line. (4) 90 street elbow - 1/4 NPTF. 3. REGULATORY REQUIREMENTS. 3.1 R
22、egulatory requirements. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable,in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR). 4. PRODUCT CONFORMANCE PROVISIONS. 4.1 Product conformance. The products provided shall meet the
23、salient characteristics of this Commercial Item Description, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same product offered for sale in the commercial marketplace. The government reserves the right to require proof of such conforman
24、ce. 5. PACKAGING. 5.1 Packaging. Preservation, packaging, packing, labeling, and marking for the desired level shall be as specified in the contract (see 6.2). 6. NOTES. (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Addresses fo
25、r obtaining copies of referenced documents. 6.1.1 Non-Government publication. Copies of SAE J246 “Spherical and Flanged Sleeve (Compression) Tube Fittings”; SAE J1409, “Air Brake Valves Test Procedure”; and SAE J1410, “Air Brake Valve-Performance Requirements” are available from http:/www.sae.org or
26、 from the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52485B 5 6.2 Ordering data. Acquisition documents should specify the following: a. Title, number, and date of
27、 this CID. b. If required, the specific issue of individual reference documents. c. Nomenclature, PIN, and quantity of each item required. d. Color of paint final top coat and if Chemical Agent Resistant Paint (CARC) is required. e. Applicable level and packaging requirements. 6.3 Part identificatio
28、n number (PIN). The PIN to be used for the relay valve and replacement kit acquired to this CID are as follows: A 52485 - X 1 = Relay valve 2 = Replacement kit CID number Designates a CID 6.4 Cross-reference. Relay valves conforming to this CID are interchangeable/substitutable with relay valves con
29、forming to MIL-V-46704A(AT) and MS53004C. 6.5 Environmentally preferable material. Environmentally preferable materials should be used to the maximum extent possible to meet the requirements of this specification. As of the dating of this document, the U.S. Environmentally Protection Agency (EPA) is
30、 focusing efforts on reducing 31 priority chemicals. The list of chemicals and additional information is available on their website http:/www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the EPA list of 31 priority chemicals are cadmium, lead, and mercury. Use of these materials on the list
31、 should be minimized or eliminated unless needed to meet the requirements specified herein (see Section 3). 6.6 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience on
32、ly, 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 issue. 6.7 Key
33、words. Axle Component Tactical Trailer Vehicular Wheel Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52485B 6 MILITARY INTERESTS: CIVIL AGENCY COORDINATING ACTIVITY: GSA - FSS Custodians Army - AT PREPARING ACTIVITY: Navy - MC Army - AT Air For
34、ce - 99 (Project 2530-2013-004) Review activities Army - MI Air Force - 84 DLA CC NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
