ANSI FCI 70-2-2013 Control Valve Seat Leakage《控制阀门座泄漏》.pdf
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1、 ANSI/FCI 70-2-2013 AMERICAN NATIONAL STANDARD CONTROL VALVE SEAT LEAKAGE Fluid Controls Institute, Inc. Sponsor: Fluid Controls Institute, Inc. 1300 Sumner Ave Cleveland, Ohio 44115-2851 iiANSI/FCI 70-2-2013 AMERICAN NATIONAL STANDARD Control Valve Seat Leakage Sponsor Fluid Controls Institute, Inc
2、. AmericanNationalStandardAmerican National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard
3、does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to obtain the
4、 latest editions. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Pu
5、rchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Sponsored and published by: FLUID CONTROLS INSTITUTE, INC. 1300 Sumner Avenue Cleveland, OH 44115-2851 Phn: 216/241-7333 Fax: 216/241-0105 E-Mail:
6、 fcifluidcontrolsinstitute.org URL: www.fluidcontrolsinstitute.org Copyright 2013, 2006, 1998, 1968 by Fluid Controls Institute, Inc. All Rights Reserved No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of
7、 the publisher. Suggestions for improvement of this standard will be welcome. They should be sent to the Fluid Controls Institute, Inc. Printed in the United States of America iiiivCONTENTS PAGE Foreword v 1. Purpose 1 2. Scope and Limitations 1 3. Definitions . 1 4. Leakage Specifications and Class
8、es 1-2 5. Test Procedures 2-4 6. References 4 Tables Table 1 2 Table 2 3 vForeword (This foreword is included for information only and is not part of ANSI/FCI 70-2-2013, Control Valve Seat Leakage.) This voluntary standard has been compiled and issued in the public interest. It is intended to elimin
9、ate present misunderstandings and to assist and guide those people involved in the specification, use or manufacture of control valves. This standard, formerly known as ASME B16.104, was originally adopted on November 24, 1970 as FCI 70-2. The standard has been revised several times through the year
10、s to stay current as the industry and its products have evolved and advanced. The standard was revised by the FCI Control Valve Section in 1998 in order to maintain consistency with the appropriate IEC Standards (IEC 534-4, currently IEC 60534-4). The standard was revised in 2003 to add the option t
11、o permit low pressure gas testing to determine Class V leakage. During the canvass of the 2003 version, one respondent asked for the standard to be modified to specifically exclude on/off valves used for tight shut-off. The FCI Control Valve and Regulator Section notes that FCI 70-2 has been intende
12、d to apply to control valve seat leakage. If line isolation and/or absolute tight shut-off is a normal expectation of the valve application, the FCI Control Valve and Regulator Sections recommend specifying another standard, such as API 598, “Valve Test and Inspection.” The 2013 revision consisted o
13、f clarifications and editorial changes. The existence of a Fluid Controls Institute (FCI) standard does not in any respect preclude any member or non-member from manufacturing or selling products not conforming to this standard nor is the FCI responsible for its use. FCI recognizes the need to perio
14、dically review and update this standard. Suggestions for improvement should be forwarded to the Fluid Controls Institute, Inc., 1300 Sumner Avenue, Cleveland, Ohio, 44115-2851. All constructive suggestions for expansion and revision of this standard are welcome. 1ANSI/FCI 70-2-2013 AMERICAN NATIONAL
15、 STANDARD Control Valve Seat Leakage 1. PURPOSE 1.1 This standard establishes a series of seat leakage classes for control valves and defines production test procedures. 2. SCOPE & LIMITATIONS 2.1 Selection of a leakage class is not restricted as to valve design, but acceptable values for various co
16、mmercially available designs are suggested for each class under Section 4. 2.2 This standard applies to production tests and cannot be used as a basis for predicting leakage at conditions other than those specified and does not apply to valves with a Cvvalue less than 0.1. 2.3 This standard is simil
17、ar to IEC 60534-4, except that no provision is made for Class IV-S1. 3. DEFINITIONS 3.1 Control Valve 3.1.1 A valve with a power positioning actuator for moving a closure member to any position relative to a valve seat or seats in response to and in proportion to an external signal. The energy for a
18、 control valve actuator is derived from an independent source. 3.1.2 Control valve body subassemblies on which an actuator is to be mounted at some later date are within the intent of this definition. 3.2 Cv- An experimentally determined valve sizing coefficient. (Ref. ISA S75.01 and ISA S75.02). 3.
19、3 Rated Valve Capacity. The quantity of test fluid (air or water) that would pass through the valve at rated travel under the stated pressure conditions as determined by the appropriate equations and manufacturers ratings. 3.4 Rated Travel. The valve travel at which the manufacturers rating is estab
20、lished. 3.5 Seat Leakage. The quantity of test fluid passing through an assembled valve in the closed position under the test conditions as defined. 3.6 Nominal Seat Diameter. Basic diameter used to determine maximum allowable seat leakage (Leakage Classes V and VI). This is also referred to as port
21、 diameter or orifice diameter (of the seat ring). It should be noted that this is not the same as NPS. 4. LEAKAGE SPECIFICATIONS & CLASSES 4.1 The maximum allowable seat leakage as specified for each class shall not exceed the seat leakage in Table 1 or Table 2 using the test procedure as defined in
22、 Section 5. For Classes II through VI each and every valve shall be tested. 4.2 Leakage Classes 4.2.1 CLASS I. A modification of any Class II, III or IV valve where design intent is the same as the basic class, but by agreement between user and supplier, no test is required. 4.2.2 CLASS II. This cla
23、ss establishes the maximum permissible leakage generally associated with commercial double-seat control valves or balanced single-seat control valves with a piston ring seal and metal-to-metal seats. Use test procedure Type A. 4.2.3 CLASS III. This class establishes the maximum permissible leakage g
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