1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS1214BAEROSPACESTANDARDAS1214 REV. BIssued 1971-07 Revised 2005-02 Reaffirmed 201
5、3-10 Superseding AS1214A (R) Minimum Standards for Valve, High Pressure Oxygen, Line Shut Off, Manually Operated RATIONALE AS1214B has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: This SAE Aerospace Standard (AS) covers all types of manually operated high pressure Oxygen
6、 line shut off valves utilizing either metallic or nonmetallic valve seats for use in general and commercial type aircraft. 1.1 Purpose: The purpose of this document is to define general minimum standards for the design, fabrication, and test of manually operated, high pressure Oxygen line shut off
7、valves. 2. REFERENCES: SAE AS861 Minimum General Standards for Oxygen Systems SAE ARP1176 Oxygen System and Component Cleaning and Packaging SAE AS8010 Aviators Breathing Oxygen Purity Standard RTCA/DO-160D Environmental Conditions and Test Procedures for Airborne Equipment A-A-59503 Oil Free Dry Ni
8、trogen CGA G-7.1 Grade D, Commodity Specification for Air SAE AIR4071 Lubricants for Oxygen Use Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. REQUIREMENTS: 3.1 General Requirements: The requirem
9、ents of AS861 are applicable to valves made under this standard. 3.1.1 Construction: 1. Wrench Flats - The valve body shall have adequate wrench flats and be sturdy enough to withstand installation and removal from typical Oxygen systems. 2. Manual On-Off Control Mechanism (valve handle) - Color - T
10、he manual control mechanism shall be colored green to denote Oxygen use. 3. Locking Device - All valve parts which, if loosened or inadvertently removed would cause leakage or escape of Oxygen, shall be secured by a self-locking device or shall be safety wired. 4. Weight and Size - The weight and si
11、ze of the valve shall be a minimum consistent with the performance requirements and within the limitations of sound design practices. 5. Mounting Provisions - The valve shall have provisions for mounting to aircraft structure as required by the purchaser, or aircraft manufacturer. The mounting provi
12、sions shall be of sufficient strength to withstand the vibration, torque and shock loads which are anticipated in service. 6. Materials - The requirements and recommendations of AS861 shall be considered in design of the valve. Valve seat(s), seals and other nonmetallic materials if used shall be an
13、alyzed so as to reduce the possibility of ignition hazards. Maximum working pressure and the environmental conditions anticipated shall be considered in the design. The amount of nonmetallic materials used should be held to an absolute minimum. It is preferred to have metal to metal valve seat(s) in
14、terfaces. 7. Protective Treatment - When materials are used in the construction of the valve that 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 wa
15、y prevent compliance with the performance requirements of this specification. The use of any protective coating that will crack, chip, or scale with age or extremes of climatic and environmental conditions shall be avoided. SAE INTERNATIONAL AS1214B Page 2 of 9_ Copyright SAE International Provided
16、by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.1.1 (Continued): 8. Elastomers - All elastomers used shall have been compounded within 24 months of the date of manufacture and such cure date shall be provided on the elastomer if suffi
17、cient area is available. Otherwise the end product must be identified as to earliest cure date of elastomer component included therein. If silicone elastomers are used, cure dating is not applicable. 9. Heat Dissipation - The valve and all high pressure passages shall be so constructed that heat gen
18、erated by adiabatic compression (when Oxygen is admitted suddenly under high pressure) is readily dissipated. 3.1.2 Operating Temperature: The valve shall be operative and permit the normal flow and shutoff of Oxygen while being subjected to ambient temperatures in the range of -40 C (-40 F) and +71
19、 C (+160 F). 3.1.3 Operating Medium: The operating medium shall be Oxygen, Aviators Breathing, per AS8010. 3.1.4 Cleaning: Cleaning of all internal parts shall be in accordance with ARP1176, or equivalent. Cleaning, or flushing of fully assembled valves shall be avoided, as trapped fluids may be lef
20、t inside the valve. 3.1.5 Lubrication: The use of lubrication shall be minimized. Lubricants used shall be in accordance with AIR4071. Lubrication shall be limited to areas that absolutely need it, such as piston bores, O-rings, other seals, etc. Avoid using lubricants in the direct flow path as muc
21、h as possible. 3.1.6 Interchangeability: All parts having the same manufacturers designation and part number shall be directly and completely interchangeable with each other with respect to installation and performance. 3.1.7 Orientation: The valve shall be capable of meeting the requirements specif
22、ied herein while oriented in any position. 3.1.8 Inlet and Outlet Ports: The inlet and outlet ports shall be designed in accordance with purchaser specifications and shall be permanently marked. A directional arrow shall be permanently marked on the valve to indicate direction of flow. SAE INTERNATI
23、ONAL AS1214B Page 3 of 9_ Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2 Detail Requirements: 3.2.1 Opening Characteristics: The valve shall be of a slow opening type; i.e., as the valve is open
24、ed, the rate of flow shall increase gradually and the slope of the curve shall meet the requirements as shown on Figure 1. 3.2.2 Manual On-Off Control Mechanism (valve handle): The control handle must be a minimum of 3.8 cm (1.5 inches) in diameter and must be grooved, lobed, or otherwise shaped to
25、provide a good gripping surface. Whenever possible the lobes or grooves should be uni-directional to provide a torque-assist in the opening direction only. 3.2.3 Operating Forces: The valve shall be designed to close completely with a torque of g1483.4 N-m (30 in-lb), and must open at a torque value
26、 of g1482.8 N-m (25 in-lb) . A maximum torque of 6.8 Nm (60 in-lb) shall not result in damage to the valve mechanism. No calibrated slippage device (clutch, etc.) shall be used which may result in the valve remaining open when slip occurs. 3.2.4 Operating Pressure: Unless otherwise stated by the pur
27、chaser, the valves shall operate up to a maximum pressure of 14.47 MPa (2,100 psig). 3.2.5 Proof Pressure: The valve shall have a minimum proof pressure 1.67 times the maximum operating pressure. 3.2.6 Burst Pressure: The valve shall have a minimum burst pressure of 2.22 times maximum operating pres
28、sure. 3.2.7 External Leakage: When tested at maximum operating pressure, the external leakage shall be “bubble tight” when checked with leak detection fluid 3.2.8 Internal (through)Leakage: When tested with maximum and minimum operating pressure and with the valve in the closed position, the through
29、 leakage shall not exceed 15 cc/minute NPTD. Valve handle torque shall be g1483.4 N-m (30 in-lb) during the internal leakage test. 3.2.9 Storage Temperature: The valve shall retain its performance capabilities as specified herein after having been exposed to temperatures of -55 C (-67 F) and 85 C (+
30、185 F) for a period of 24 hours each. 3.2.10 Endurance: The valve shall function as specified herein after 2,000 operating cycles applied at maximum operating pressure. A cycle shall consist of opening and closing the valve fully at maximum operating pressure using test gas as a test media. After th
31、e first 1,000 cycles the valve may be disassembled, inspected, cleaned, lubricated, and reassembled.The outlet shall be capped for the first 1,000 cycles. The outlet shall be uncapped for the second 1,000 cycles, allowing relief of the downstream pressure after each cycle. SAE INTERNATIONAL AS1214B
32、Page 4 of 9_ Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.2.11 Vibration/Shock: Unless otherwise stated by the purchaser, the valve shall be designed to withstand vibration and shock in accordan
33、ce with RTCA/DO-160D, section 7, and 8 as follows: VIBRATION: Operational Random Vibration per RTCA/DO-160D, section 8.5.2, fig. 8-1,Curve C (4.12 grms for 2 hours). Robust Random Vibration per RTCA/DO-160D, section 8.7.2, fig. 8-4,Curve C1 (5.83 grms for 3 hours). High-Level Short Duration Sinusoid
34、al Vibration per RTCA/DO-160D, section 8.6, fig. 8-5,Curve R (+/- 2.5 g peak). SHOCK: Operational Shock per RTCA/DO-160D, section 7.2, (6 g, 11 ms). Crash Safety Shock (Impulse) per RTCA/DO-160D, section 7.3.1, (20 g, 11 ms). Crash Safety Shock (Sustained) per RTCA/DO-160D, section 7.3.2, (9 g, 3 se
35、c minimum). 4. QUALITY ASSURANCE: 4.1 Test Requirements: 4.1.1 Qualification Tests: Qualification tests shall consist of those tests listed in 3.5 and should be completed and satisfactorily reported to the purchaser prior to shipment of production parts. 4.1.2 Acceptance Tests: Acceptance tests shal
36、l consist of those listed in 3.5.1, 3.5.4, 3.5.5, and 3.5.6, and shall be conducted, except as noted, on each production part prior to shipment. 4.2 Test Media: The test media shall be (1) dry Oxygen, aviators breathing, conforming to AS8010, (2) oil-free nitrogen conforming to Specification A-A-595
37、03, or (3) oil-free air equivalent in dryness conforming to Specification CGA G-7.1 and meeting its contamination requirements. 4.3 Test Methods: 4.3.1 Examination of Product: Each valve shall be examined for visible defects, burrs, and cleanliness to determine conformance to this standard. SAE INTE
38、RNATIONAL AS1214B Page 5 of 9_ Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.3.2 Opening Characteristics: The line valve assembly shall be adjusted to the fully closed position. The maximum opera
39、ting pressure shall be applied to the inlet of the valve assembly with the outlet attached to a suitable flow measuring device. The valve assembly shall then be opened, in increments of half turns. The maximum flow rate for each half turn increment shall be recorded. The flow rates for each half tur
40、n shall be within the limits as specified in Figure 1. The above test shall be repeated at an inlet pressure of 1.7 MPa (250 psig). 4.3.3 Maximum Torque: With no inlet pressure applied to the valve, a torque of 6.6 to 6.8 Nm (58 to 60 in-lb) shall be applied to the valve in both the maximum open and
41、 maximum closed positions. This procedure shall be repeated 50 times. The valve shall then be subjected to and comply with all the requirements of 3.5.5 and 3.5.6. 4.3.4 Proof Pressure: Each valve shall be subjected to an Oxygen pressure of 1.67 times maximum operating pressure applied at the inlet
42、with the valve in the open position and the outlet capped. At the end of a 2 minute period, there shall be no distortion and external leakage shall be “bubble” tight after the application of leak detection fluid. After relieving the pressure, the valve shall be manually closed and the outlet shall b
43、e uncapped. The same pressure shall again be applied for a 2 minute period. At the end of this period, the external leakage shall be “bubble” tight. Dry after test. 4.3.5 External Leakage: With the valve in the “open” position, suitably plug the outlet and apply maximum operating pressure to the inl
44、et. Apply leak detection fluid to all areas that could be potential leak paths. External leakage shall be” bubble tight”. Dry valve after test. 4.3.6 Internal (thru) Leakage: With the valve in the “closed” position, torque the On-Off control mechanism (handle) to a maximum of 3.4 Nm (30 in-lb). Appl
45、y a pressure of 1.7 MPa (250 psi) to the inlet port. The outlet port shall be attached to a suitable measuring device. Leakage from the outlet shall not exceed 15 cc/minute NTPD. Repeat this test with maximum operating pressure. 4.3.6.1 Valve Handle/Spindle External Leakage: With the valve outlet ca
46、pped and 0.69 MPa, and 14.47 MPa (100 and 2100 psi) applied alternately to valve inlet, apply leak detection fluid to all areas that could be potential leak paths. With valve handle alternately in closed, half-opened and full-opened position apply approximate 17.8 to 22.2 N (4 to 5 lb) side load to
47、handle. Leakage in excess of 5 cc/minute NTPD when a side load is applied is cause for valve rejection. 4.3.7 Storage Temperature: The valve shall be conditioned at a temperature of-55 C (-67 F) minimum for a period of 24 hours. At the end of this period, the valve shall, within 1 hour, be conditioned at a minimum of +85 C (+185 F) for an additional 24 hours. The valve shall then be returned to room temperature and after at least 30 minutes be subjected to and comply with the requirements of 3.5.5 and
