MSS SP42-1999法兰端和对焊端耐腐蚀的闸阀、截止阀、角阀和止回阀150磅级（PN20）(英文版).pdf

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STDDMSS SP-42-ENGL 2999 = 5770640 05DLLBO O29 =
MSS SP-42-1999
Class 150 (PN 20)
Corrosion Resistant Gate,
Globe, Angle and Check Valves
with Flanged and Butt Weld Ends
Standard Practice
Developed and Approved by the
Manufacturers Standardization Society of the
Valve and Fittings, Industry, Inc.
127 Park Street, .
Vienna, Virginia 221 80
COPYRIGHT Manufacturers Standardization Society of the Valve and Fittings
Licensed by Information Handling Services
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STD*MSS SP-42-ENGL 1999 = 5770b40 050LL81 Tb5
MSS STANDARD PRACTICE SP-42
An MSS Standard Practice is intended as a basis mon practice by the manufacturer, the user, and the genera1
public. The existence of an MSS Standard Practice does not in itself preclude the manufacture, sale, or use of
products not conforming to the Standard Practice. Mandatory conformance is established only by reference in a
code, specification, sales contract, or public law, as applicable.
This document has been substantively revised from the previous edition. It is suggested that if the
user is interested in knowing what changes have been made, direct page by parison should
be made of this document with the 1995 edition.
Any part of this standard may be quoted. Credit lines should read ‘ExtractedfromMSS SP-42, 2000, with permission of
the publishel; thManufacturers Standardization Society.’Reproduction prohibited under copyright convention unless
written permission is granted by the Manufacturers Standardization Society of the Valve and Fittings Industy, Inc.
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 SP. See Annex B.
Originally Approved
October 1949
Copyright 0 1985 by
Manufacturers Standardization Society
of the
Valve and Fittings Industry, Inc.
Printed in