1、AEROSPACE STANDARDMA2537Issued 1990-08Reaffirmed 2006-05Groove Design, Metal C-Ring Gasket, Face TypeInternal Pressure, MetricFSC 53301. SCOPE AND FIELD OF APPLICATION:1.1 This standard provides the design criteria for static metal c-ring gasket applications, face type (axial compression) groove dim
2、ensions for aerospace metric c-ring sizes specified in MA2536.1.2 Primarily for aerospace propulsion system applications where internally pressurized face type metal c-ring gaskets are required for sealing fluids at temperatures that precludes the use of elastomeric seals.1.3 A table of c-ring groov
3、e dimensions are included based on the design criteria specified herein. Dimensions in this document are in millimeters, unless otherwise specified.2. REFERENCES:2.1 Applicable Documents:MA2536 Gasket, Metal C-Ring, Internal Pressure, UNS N07750, Silver Plate, MetricANSI/ASME B46.1-1985 Surface Text
4、ure (Surface Roughness, Waviness, and Lay)ANSI Y14.36-1978 Surface Texture SymbolsSAE 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 sui
5、tability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Cop
6、yright 2006 SAE International All rights reserved. No part of this publication 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
7、ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org RATIONALE This document has been reaffirmed to comply with the SAE 5-year Review policy. Copyright SAE International Provided by IHS und
8、er license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 - 2 -2.2 Symbols:Letter symbols used in this document are as follows:A c-ring outside diameterB c-ring inside diameterC c-ring cross-section outside diameterD groove outside diameter, int
9、ernal pressureE port inside diameter, open cavityF c-ring groove axial depthG c-ring groove width, closed cavityR corner radius, bottom of grooveT c-ring wall thickness3. TECHNICAL REQUIREMENTS:3.1 C-Rings:Figure 1 illustrates a c-ring; the outside diameter, inside diameter, and cross-section diamet
10、er are in accordance with MA2536.FIGURE 1 - C-Ring Dimensions3.2 Face Type (Axial) C-Ring Groove, Internal Pressure:Figure 2 specifies the letter symbol dimensions for face type c-ring groove, internal pressure, without inner groove wall. Figure 3 specifies the letter symbol dimensions for face type
11、 c-ring groove, internal pressure, with inner and outer groove walls.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 - 3 -FIGURE 2 - Axial C-Ring Groove, Internal PressureWithout Inner Gro
12、ove Wall, Open CavityFIGURE 3 - Axial C-Ring Groove, Internal PressureWith Inner and Outer Groove Walls3.3 Surface Texture:The surface roughness shall be 1.6 m Ra on the groove side walls and 0.8 m Ra with circular lay on bottom surface, and also, on the mating top surface in contact with the c-ring
13、 seal (see Figure 4). Surface roughness shall be determined in accordance with ANSI/ASME B46.1; symbols are in accordance with ANSI Y14.36.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 -
14、 4 -FIGURE 4 - Groove Surface Texture3.4 Corner Radius and Edge Break:The corner radius R (see Figures 2, 3, and 4) at bottom of groove shall be as specified in Table 1. The groove edges shall have 0.1 to 0.3 edge break.TABLE 1 - Groove Corner Radius (R)3.5 Dimensions of Face Type Groove:3.5.1 Groov
15、e Depth, F: The groove depths, F, are specified in Table 2 and are applicable for plated or unplated c-ring gaskets. The values were calculated to provide 20% squeeze on the nominal cross-sectional diameter of the c-ring; thus, the equation becomes:(Eq. 1)F nom 0.8 C nom=Copyright SAE International
16、Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 - 5 -3.5.1 (Continued):The groove depth tolerances and resulting maximum and minimum percent squeeze based on the limits for C, c-ring cross-section diameter, are given
17、 in Table 2 and calculated from the following equation:(Eq. 2)(Eq. 3)TABLE 2 - Groove Depth F and Percent Squeeze3.5.2 Groove Outside Diameter, Internal Pressure, D: For internal pressure sealing, the groove outside diameter (D) should be large enough to avoid interference (locking) with the c-ring
18、outside diameter (A) when the ring is compressed in the groove at assembly. Seal ring outside diameter (A) grows approximately 50% of the amount of seal compression. The diameter (B) on the open side of the c-ring seal does not change significantly. Sealing contact on the c-ring should only occur at
19、 the bottom of the groove and at the surface of the mating part. If the gasket makes contact with the groove outside diameter (D), as well as the groove bottom surface and the surface of the mating part, a three line contact on the gasket is formed, which can cause leakage because the friction force
20、 generated between the gasket and the groove wall reduces the sealing contact force at the bottom of the groove. Therefore, the groove outer wall diameter is made larger than the c-ring outside diameter (A) by 50% of the maximum squeeze, calculated from the following equations for unplated c-ring ga
21、skets:% Squeeze min C min F max()C min100=% Squeeze max C max F min C max 100=Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 - 6 -3.5.2 (Continued):For plated c-ring gaskets, internal pre
22、ssure seals, the groove outside diameter (D) shall be increased by two times the maximum plating thickness.3.5.3 Groove Width, G: The minimum groove width shall accommodate the maximum squeeze of the c-ring cross-section. The change in c-ring cross-section is approximately 25% of the maximum squeeze
23、; therefore, the minimum groove width can be stated to be as follows:(Eq. 7)where0.08(C nom) is minimum clearanceTo simplify, Equation 7 can become:(Eq. 8)For plated c-ring gaskets, groove width G shall be increased by two times the maximum plating thickness.3.5.4 Port Inside Diameter, E, Open Cavit
24、y: The maximum port diameter, E max for open cavity (without inner groove wall, see Figure 2), is calculated from the following equation:(Eq. 9)For plated c-ring gaskets, internal pressure seals, the port inside diameter (E max) for the open cavity shall be decreased by two times the maximum plating
25、 thickness.3.5.5 Groove Dimensions: Tables 3 through 5 provide groove dimensions for unplated c-ring gasket sizes shown in MA2536. For plated MA2536 gaskets, dimensions D, E and G min shall be revised as follows:a. D increased by 2 x max plating thickness.b. E decreased by 2 x max plating thickness.
26、c. G min increased by 2 x max plating thickness.PREPARED BY SAE COMMITTEE E-25,GENERAL STANDARDS FOR AEROSPACE PROPULSION SYSTEMSG min 0.5 A max B min()0.25 C max F min()+ 0.08 C nom()+=G min C nom 0.05G max G min 0.5 H11 Tol based on D min()+=+=E max B min 0.25=Copyright SAE International Provided
27、by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 - 7 -TABLE 3 - C-Ring Gasket, Axial Squeeze, Groove DimensionsCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permi
28、tted without license from IHS-,-,-SAE MA2537 - 8 -TABLE 4 - C-Ring Gasket, Axial Squeeze, Groove DImensionsCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE MA2537 - 9 -TABLE 5 - C-Ring Gasket, Axial Squeeze, Groove DimensionsCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
