MSS SP-88-2010 隔膜阀 Diaphragm Valves.pdf
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1、 MSS SP-88-2010 Diaphragm Valves Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, Virginia 22180 Phone: (703) 281-6613 Fax: (703) 281-6671 e-mail: infomss-hq.org www.mss-hq.org MSS STANDARD PRAC
2、TICESP-88 i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 406 and the MSS Coordinating Committee. The content of this Standard Practice is the result of the efforts of competent and concerned volunteers to provide an effective, clear, and non-exclusive s
3、pecification that will benefit the industry as a whole. This MSS Standard Practice is intended as a basis for common practice by the manufacturer, the user, and the general public. The existence of an MSS Standard Practice does not in itself preclude the manufacture, sale, or use of products not con
4、forming to the Standard Practice. Mandatory conformance is established only by reference in a code, specification, sales contract, or public law, as applicable. “Other standards documents referred to herein are identified by the date of issue that was applicable to this Standard Practice at the date
5、 of issue of this Standard Practice. See Annex B. This Standard Practice shall remain silent on the applicability of those other standards of prior or subsequent dates of issue even though applicable provisions may not have changed. References contained herein which are bibliographic in nature are n
6、oted as supplemental in the text.” Unless otherwise specifically noted in this MSS SP, any Standard referred to herein is identified by the date of issue that was applicable to the referenced Standard(s) at the date of issue of this MSS Standard Practice (See Annex B). In this Standard Practice all
7、notes, annexes, tables, and figures are construed to be essential to the understanding of the message of the standard, and are considered part of the text unless noted as “supplemental“. All appendices appearing in this document are construed as “supplemental“. Supplemental“ information does not inc
8、lude mandatory requirements. Substantive changes in this 2010 edition are “flagged” by parallel bars as shown on the margins of this paragraph. The specific detail of the change may be determined by comparing the material flagged with that in the previous edition. U.S. customary units in this Standa
9、rd Practice are the standard; metric (SI) units are for reference only. Any part of this Standard Practice may be quoted. Credit lines should read Extracted from MSS SP-88- 2010 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Reproduct
10、ion prohibited under copyright convention unless written permission is granted by Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. Originally Approved: January 1978 Copyright , 1978, 1983, 1993, 2010 by Manufacturers Standardization Society of the Valve and Fittings Ind
11、ustry, Inc. Printed in U.S.A. MSS STANDARD PRACTICESP-88 ii TABLE OF CONTENTS SECTION PAGE PURPOSE. 1 1 SCOPE. . 1 2 PRESSURE-TEMPERATURE RATINGS. . 1 3 DIAPHRAGMS. . 2 4 BODY-BONNET JOINTS. . 2 5 BODY MATERIALS 3 6 BONNETS 3 7 BODY FACE-TO-FACE DIMENSIONS. 3 8 BODY END CONNECTIONS AND WALL THICKNES
12、S 3 9 ACTUATOR APPLICATION REQUIREMENTS 3 10 SHELL TESTS 4 11 SEAT TESTS 4 12 MARKING 5 TABLE A1 Maximum Service Pressure-Ratings at 100 F (38 C) for Category B Valves (Standard Valves Section 2.2) . 6 A2 Commonly Used Face-To-Face Dimensions of Flanged Diaphragm Valves . 7 A3 Standards Applicable t
13、o Body Wall Thickness and the Dimensions of Threaded, Flanged, and Butt Weld Body End Connections for Category A and Category B Valves Only 8 A4 Body Materials Standards . 9 A5 Test Durations and Test Pressures Based on Diaphragm Maximum Service Pressure Ratings Shown in Table 1 10 ANNEX A Tables 6
14、B Referenced Standards and Applicable Dates . 11 MSS STANDARD PRACTICESP-88 1 PURPOSE The purpose of this Standard Practice is to outline the limitations and requirements of valves in which a nonmetallic, resilient diaphragm is used to separate the working parts of the valve from the line fluid and
15、also functions in conjunction with other parts as valve closure-member. The use of a nonmetallic, resilient diaphragm causes valves described in this Standard Practice to be different from other commonly used valves for which genera1 and specific Standards and Standard Practices are in existence. Th
16、ese differences include pressure-temperature limitations, face-to-face dimension requirements, and specific service characteristics. This Standard Practice reflects industry practice in the design, manufacture, and application of this type of valve. 1. SCOPE 1.1 This Standard Practice applies to val
17、ves for general liquid and gas service that effect valve closure by means of a resilient diaphragm sealing against a weir or a diaphragm acting in conjunction with a separate or integral disk-member sealing against a seat, having equal sealing capability in either flow direction, and having diaphrag
18、ms being essentially made of elastomeric or plastic material or combinations thereof. 1.2 This Standard Practice defines the following categories of valves: a) Class 125 or 150 Valves (See Section 2.1) b) Standard Valves (See Section 2.2) c) Valves for Special (Low Pressure) Applications (See Sectio
19、n 2.3) The purchaser, when referencing the Standard Practice, shall also specify the appropriate category as listed above. 1.3 This Standard Practice covers the following: a) Pressure-Temperature Ratings and Design requirements b) Commonly Used Diaphragm Pressure Limitations c) Body, Bonnet, and Bol
20、ting Materials d) Commonly Used Face-to-Face Dimensions for Flanged Valves e) Body End Connections and Wall Thicknesses f) Actuator Application Requirements g) Tests h) Marking 1.4 For specific requirements relating to the dairy industry, refer to 3-A SSI 54-02. 2. PRESSURE-TEMPERATURE RATINGS 2.1 C
21、ategory A Valves: (Class 125 or 150) The maximum non-shock pressure-temperature ratings of valve bodies for valves in this category shall be those specified in the applicable Standards referenced in Table A3, Annex A, and the valve bodies must conform to the applicable requirements of the referenced
22、 standards (see Sections 2.4 and 2.5 for service ratings of the diaphragms). 2.2 Category B Valves: (Standard Valves) The maximum non-shock pressure-temperature ratings of valves in this category shall be those listed in Table A1, Annex A. Body wall thicknesses shall be those established by the appl
23、icable requirements of the referenced standards in Table A3, Annex A. 2.3 Category C Valves: (Special Valves, Low Pressure) The maximum non-shock pressure-temperature ratings of valves in this category shall be those established by the manufacturer for the particular design. DIAPHRAGM VALVES MSS STA
24、NDARD PRACTICESP-88 2 2.4 The actual service pressure-temperature rating of the assembled diaphragm valves shall be limited to the pressure-temperature rating of the body or the diaphragm, whichever is lower, as outlined in Section 2.5. 2.5 The service ratings of the diaphragms shall be those establ
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