1、MSS SP-139-2014 Copper Alloy Gate, Globe, Angle, and Check Valves for Low Pressure/Low Temperature Plumbing Applications Standard Practice Developed and Approved by the Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. 127 Park Street, NE Vienna, Virginia 22180-4602 Phon
2、e: (703) 281-6613 Fax: (703) 281-6671 E-mail: standardsmss-hq.org www.mss-hq.org MSS STANDARD PRACTICE SP-139i This MSS Standard Practice was developed under the consensus of the MSS Technical Committee 203 and the MSS Coordinating Committee. The content of this Standard Practice is the resulting ef
3、forts of competent and experienced volunteers to provide an effective, clear, and non-exclusive standard that will benefit the industry as a whole. This MSS Standard Practice describes minimal requirements and is intended as a basis for common practice by the manufacturer, the user, and the general
4、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 to this Standard Practice is established only by reference in other documents such as a code, specification, sales co
5、ntract, or public law, as applicable. MSS has no power, nor does it undertake, to enforce or certify compliance with this document. Any certification or other statement of compliance with the requirements of this Standard Practice shall not be attributable to MSS and is solely the responsibility of
6、the certifier or maker of the statement. “Unless indicated otherwise within this MSS Standard Practice, other standards documents referenced to herein are identified by the date of issue that was applicable to this Standard Practice at the date of approval of this MSS Standard Practice (see Annex A)
7、. This Standard Practice shall remain silent on the validity of those other standards of prior or subsequent dates of issue even though applicable provisions may not have changed.” By publication of this Standard Practice, no position is taken with respect to the validity of any potential claim(s) o
8、r of any patent rights in connection therewith. MSS shall not be held responsible for identifying any patent rights. Users are expressly advised that determination of patent rights and the risk of infringement of such rights are entirely their responsibility. In this Standard Practice, all text, not
9、es, annexes, tables, figures, and references are construed to be essential to the understanding of the message of the standard, and are considered normative unless indicated as “supplemental”. All appendices, if included, that appear in this document are construed as “supplemental”. Note that supple
10、mental information does not include mandatory requirements. U.S. customary units in this Standard Practice are the standard; (SI) metric units, unless otherwise indicated, are for reference only. Substantive changes in this 2014 edition are “flagged” by parallel bars as shown on the margins of this
11、paragraph. The specific detail of the change may be determined by comparing the material flagged with that in the previous 2010 edition. Non-toleranced dimensions in this Standard Practice are nominal unless otherwise specified. Excerpts of this Standard Practice may be quoted with permission. Credi
12、t lines should read Extracted from MSS SP-139-2014 with permission of the publisher, Manufacturers Standardization Society of the Valve and Fittings Industry. Reproduction and/or electronic transmission or dissemination is prohibited under copyright convention unless written permission is granted by
13、 the Manufacturers Standardization Society of the Valve and Fittings Industry Inc. All rights reserved. Originally Approved: January 2010 Originally Published: April 2010 Current Edition Approved: December 2013 Current Edition Published: September 2014 Copyright , 2014 by Manufacturers Standardizati
14、on Society of the Valve and Fittings Industry, Inc. Printed in U.S.A. MSS STANDARD PRACTICE SP-139ii TABLE OF CONTENTS SECTION PAGE PURPOSE . 1 1 SCOPE 1 2 PRESSURE-TEMPERATURE RATINGS . 1 3 MATERIALS 2 4 DESIGN 2 5 MARKINGS 5 6 TOLERANCE . 5 7 INSPECTION AND TESTING 5 TABLE 1 Minimum Length and Dep
15、th of Thread . 3 2 Diameter of Handwheels . 5 X1-1 Minimum Length and Depth of Thread 9 X1-2 Minimum Diameter of Handwheels 10 ANNEX A Referenced Standards and Applicable Dates 7 APPENDIX X1 Metric References . 9 MSS STANDARD PRACTICE SP-1391 PURPOSE This MSS Standard Practice establishes requiremen
16、ts for copper alloy gate, globe, angle, and check valves used in applications with connections and connected to materials which will not support the pressures and temperatures of applicable ANSI-approved Class standards and the requirements of MSS SP-80. 1. SCOPE 1.1 Scope This Standard Practice est
17、ablishes requirements for copper alloy gate, globe, angle and check valves for plumbing and other purposes where a non-Class, CWP pressure and temperature rating is sufficient. This Standard Practice provides requirements for the following: a) Pressure-Temperature Ratings b) Materials c) End Connect
18、ions d) Dimensions e) Markings f) Testing and Inspection 1.2 References Standards and specifications adopted by reference in this Standard Practice, along with names and addresses of the sponsoring organizations, are shown in Annex A. It is not considered practical to refer to a specific edition of
19、each of the standards and specifications within the individual references herein. Instead, the specific edition references are included in Annex A. A product made in conformance with the edition reference that is applicable during the time of manufacture, and in all other respects conforming to this
20、 standard, will be considered to be in conformance even though the edition reference may be changed in a subsequent revision of this Standard Practice. 1.3 Description 1.3.1 Gate Valve A valve with a closure member, such as a gate, wedge, disc, or double disc, which moves on an axis perpendicular to
21、 the direction of flow. 1.3.1.1 Inside-Screw, Non-Rising Stem A type of gate valve design in which the disc rises on the threaded part of the stem instead of the stem rising through the bonnet (the stem does not rise or descend as the stem is turned). 1.3.1.2 Inside-Screw, Rising-Stem A type of gate
22、 or globe valve design in which the stem has both rotary and axial motion and rises as the stem is turned (the stem threads are between the stem seal and the closure member). 1.3.2 Globe Valve A valve with a closure member, such as a disc or plug, which moves on an axis perpendicular to the seat. 1.
23、3.3 Angle Valves An angle pattern variant of the globe valve in which the body connection ends are at right angles. 1.3.4 Check Valve A unidirectional valve that is opened by the fluid flow in one direction and closes automatically to prevent flow in the reverse direction. 2. PRESSURE-TEMPERATURE RA
24、TINGS 2.1 Basis of Rating The pressure-temperature ratings for assembled valves shall be determined by the material of the body, seats, stem seals, end connections or any other component or type of construction that would be restrictive. Manufacturers should be consulted for exact ratings applicable
25、 for a particular material or type. 2.2 Cold Working Pressure (CWP) The cold working pressure rating of the valve shell and components is the maximum allowable non-shock pressure at 100 F. The maximum working pressure at any other temperature shall not exceed this rated pressure. COPPER ALLOY GATE,
26、GLOBE, ANGLE, AND CHECK VALVES FOR LOW PRESSURE/LOW TEMPERATURE PLUMBING APPLICATIONS MSS STANDARD PRACTICE SP-1392 3. MATERIALS 3.1 The valve pressure boundary parts shall be made from metals that have the allowable stress established for the temperature range for which the valve is designed. Mater
27、ials shall be made to CDA, ASTM, or other nationally recognized standards for which mechanical and chemical data are available. 3.2 When the valve is to be used in potable water, all wetted parts shall be constructed of materials such that the assembled valve will meet the requirements of NSF 61, Se
28、ction 8. 3.3 Castings All castings shall be clean and sound, without defects which will impair their service. No plugging, welding, repairing, or impregnating is allowed. 3.4 Corrosion Users are cautioned against application with fluids that may react chemically with any material used in these valve
29、s. In certain areas of the country, where water conditions are particularly “aggressive”, piping components made from certain zinc-bearing copper-base alloys are susceptible to a form of corrosion known as dezincification. Consultation with the manufacturer is advised to determine suitability in cas
30、es of doubt. 4. DESIGN 4.1 General Valve shall be of substantial construction to resist permanent distortion under normal service conditions and shall be free of imperfections and defects which may be injurious to the performance of the valve. 4.1.1 The design of the valve shall be such as to provid
31、e against detrimental distortion under hydrostatic test conditions, assembly stresses, closing stresses, pipe reaction stresses, or when rated pressure is applied across a closed valve. 4.2 Flow Area 4.2.1 The flow passageway of copper alloy gate valves shall have a minimum area of not less than the
32、 area of a circle having a diameter equal to the nominal pipe size except that valves fitted with seat rings may reduce the passageway area by the area of the seat ring driving lugs. The valve shall be so designed that the stem and/or wedge clear the waterway when the valve is fully open. 4.2.2 The
33、flow passageway of copper alloy, globe, and angle valves designed with integral seats and when fully opened, shall have an area at all points equal to the area of a circle having a diameter equal to the nominal pipe size; except that the area through the seat may be reduced by the area of the disc g
34、uides. 4.2.3 The flow passageway of copper alloy swing type, check valves shall have a minimum area of not less than the area of a circle having a diameter equal to the nominal pipe size except that valves fitted with seat rings may reduce the passageway area by the area of the seat ring driving lug
35、s. 4.3 Body and Bonnet 4.3.1 Body-Bonnet Joint 4.3.1.1 Threaded body joints exposed to piping loads shall satisfy the following thread shear area requirements: P(Ag/As) .47 Sa Where: P = Valve cold working pressure, psi (kPa). Ag = Area bounded by the effective outside periphery of a gasket or o-rin
36、g, or other seal effective periphery, except that in the case of a ring-joint, the bounded area is defined by the pitch diameter of the ring, square inches (square millimeters). As = Total effective thread shear area, square inches (square millimeters). Sa = Allowable minimum body/bonnet stress, fro
37、m ASME Boiler and Pressure Vessel Code, Section VIII, Division 1; not to exceed 20,000 psi (137.9 MPa). For non-listed materials, the allowable stress shall be the lesser of 25% of the minimum tensile strength, or 67% of the minimum yield strength, not to exceed 20,000 psi (137.9 MPa). MSS STANDARD
38、PRACTICE SP-1393 4.3.2 End Connections 4.3.2.1 Threaded Ends 4.3.2.1.1 Threaded end bodies may have polygon ends or may have rounded ends with ribs. Valves with threaded ends shall be threaded in accordance with the requirements of ASME B1.20.1. 4.3.2.1.2 All threads shall be countersunk a distance
39、not less than one-half the pitch of the threads at an angle of approximately 45 degrees. Countersinking shall be concentric with threads. 4.3.2.1.3 The length of the threads specified in Table 1 (Table X1-1) shall be measured to include the countersink or chamfer and comply with L1 and L3 gauging. T
40、he maximum allowable variation in the alignment of threads of all openings of threaded valves shall be 0.06 inches (1.5 mm) in 12 inches (305 mm). 4.3.2.2 Solder-Joint Ends Solder-Joint ends shall be prepared in accordance with applicable requirements of ASME B16.18. 4.3.2.3 Grooved ends shall have
41、groove dimensions in accordance with AWWA C606. TABLE 1 Minimum Length and Depth of Thread(a)Pipe Size (NPS) B Length of Thread (minimum) (in.) C Depth of Thread Chamber (a)(minimum) (in.) 1/4 0.28 0.40 3/8 0.31 0.42 1/2 0.37 0.54 3/4 0.44 0.57 1 0.51 0.70 11/40.60 0.71 11/20.62 0.75 2 0.67 0.79 21/
42、20.82 1.14 3 0.88 1.20 NOTE: (a) Distance parallel to axis from face of valve to nearest point of seat diaphragm wall. GENERAL NOTE: See supplemental Table X1-1 in Appendix X1 for (SI) metric units. MSS STANDARD PRACTICE SP-1394 4.3.2.4 Flared ends shall be in accordance with ASME B16.26. 4.3.2.5 PE
43、X barb-ends for connection to PEX tubing shall be in accordance with ASTM F1807 or ASTM F1960. 4.3.2.6 Push fit connections shall comply with the requirements of ASSE 1061. 4.3.2.7 Press-type connections shall comply with the requirements of IAPMO PS-117. 4.3.3 Stem Thread Engagement 4.3.3.1 Rising-
44、stem valves shall have a minimum length of stem-thread engagement equal to the out-side diameter of the thread when the valve is closed and 75% of the outside diameter of the stem thread when the valve is fully open. 4.3.3.2 In the case of non-rising stem (NRS) valves, the length of the stem thread
45、in contact with the wedge shall be at least equal to the outside diameter of the thread when the valve is closed. 4.3.4 Backseat A backseat shall be provided in all types of gate, globe, and angle valves; however, repacking while the valve is pressurized is not recommended. 4.4 Disc and Seat Rings 4
46、.4.1 Disc and Seat Rings for Copper Alloy Gate Valves 4.4.1.1 Wedge, gate, or discs shall have disc guides. The stem chamber of the NRS discs shall be open at the bottom for proper drainage. 4.4.1.2 All discs shall have machined seating-surfaces and shall be securely attached to the stem in all oper
47、ating positions. 4.4.1.3 Seats may have expanded-in, threaded-in, or otherwise renewable seat rings or may be cast integral with the body at the manufacturers option. 4.4.2 Disc and Seat Rings for Copper Alloy Globe and Angle Valves 4.4.2.1 Discs or disc holders shall be fastened securely to the end
48、 of the stem in such a manner as to allow these parts to swivel freely. Valves may have the disc or disc holder formed on the end of the stem. Discs, plugs or disc holders of the slip-on type shall be adequately guided for self-centering and shall be so constructed in relation to body and bonnet, th
49、at when the valve is fully opened, they will not slip off the stem. 4.4.2.2 The seat may have an expanded-in, threaded-in, or otherwise renewable seat ring, or may be cast integral with the body at the manufacturers option. 4.4.3 Discs and Seats for Copper Alloy Check Valves 4.4.3.1 Copper Alloy, horizontal and angle lift checks shall have the disc or disc holder substantially guided to ensure proper seating. 4.4.3.2 Copper Alloy, swing check valves shall have disc and disc holder fastened securely to the hanger or hinge. The connection shall allow sufficient freedom so
