ASTM F1793-97(2021)

Standard Specification for Automatic Shut-Off Valves (Also Known as Excess Flow Valves, EFV) for Air or Nitrogen Service

ABSTRACT
This specification covers self-contained automatic shutoff valves (also known as excess flow valves) for air or nitrogen service. They are intended to be installed as safety devices to quickly and automatically shut off flow under certain excess flow conditions caused by a downstream failure or casualty, such as a hose rupture. Automatic shut-off valves shall be of the following types, styles, sizes, pressure ratings, and end connections: Types I and II; Styles 1 and 2. Each automatic shut-off valve must pass the following tests: visual examination; hydrostatic shell test; seal tightness test; external leakage test; and set-point test.
SCOPE
1.1 This specification covers self-contained automatic shut-off valves (also known as excess flow valves) for air or nitrogen service. They are intended to be installed as safety devices to quickly and automatically shut off flow under certain excess flow conditions caused by a downstream failure or casualty, such as a hose rupture.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Dec-2020
• ICS: 23.060.01 - Valves in general
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:F1793 −97 (Reapproved 2021) An American National Standard
Standard Specification for
Automatic Shut-Off Valves (Also Known as Excess Flow
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Valves, EFV) for Air or Nitrogen Service
This standard is issued under the fixed designation F1793; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope ASME B16.34 Valves — Flanged, Threaded, and Welding
End
1.1 This specification covers self-contained automatic shut-
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2.3 Military Standards and Specifications:
off valves (also known as excess flow valves) for air or
MIL-STD-167-1 Mechanical Vibrations of Shipboard
nitrogen service. They are intended to be installed as safety
Equipment (Type I—Environmental and Type II—
devicestoquicklyandautomaticallyshutoffflowundercertain
Internally Excited)
excess flow conditions caused by a downstream failure or
MIL-STD-740-1 Airborne Sound Measurements andAccep-
casualty, such as a hose rupture.
tance Criteria of Shipboard Equipment
1.2 The values stated in inch-pound units are to be regarded
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard Ma-
as standard. The values given in parentheses are mathematical
chinery Equipment and Systems, Requirements for
conversions to SI units that are provided for information only
MIL-F-1183 Fitting, Pipe, Cast Bronze, Silver-Brazing,
and are not considered standard.
General Specification for
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1.3 This international standard was developed in accor-
2.4 Government Drawings:
dance with internationally recognized principles on standard-
Naval Sea Systems Command (NAVSEA)
ization established in the Decision on Principles for the
NAVSEA 803-1385884 Unions, Fittings and Adapters Butt
Development of International Standards, Guides and Recom-
and Socket Welding 6000 PSI, WOG, NPS
mendations issued by the World Trade Organization Technical
NAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI,
Barriers to Trade (TBT) Committee.
WOG, NPS, for UT Inspection
NAVSEA 803-1385946 Unions, Bronze Silver Brazing,
2. Referenced Documents
WOG for UT Inspection
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2.1 ASTM Standards:
3. Terminology
F992 Specification for Valve Label Plates
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2.2 ASME Standards: 3.1 Definitions:
ASME B1.1 Unified Inch Screw Threads (UN, UNR, and
3.1.1 automatic shut-off valve, n—automatic shut-off valves
UNJ Thread Forms) covered by this specification trip shut in response to the
ASME B1.20.1 Pipe Threads, General Purpose, Inch
pressure differential across the valve.
ASME B16.11 Forged Fittings, Socket-Welding and
3.1.2 bubble-tight, n—no visible leakage over a 3-min
Threaded
period using either water submersion or the application of
ASME B16.25 Buttwelding Ends
bubble fluid for detection.
3.1.3 external leakage, n—leakage from the automatic shut-
off valve that escapes to atmosphere.
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This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
3.1.4 hydrostatic shell test pressure, n—the hydrostatic shell
Machinery and Piping Systems.
test pressure that the automatic shut-off valve is required to
Current edition approved Jan. 1, 2021. Published January 2021. Originally
ɛ1 withstand without damage.Automatic shut-off valve operation
approved in 1997. Last previous edition approved in 2016 as F1793 – 97 (2016) .
DOI: 10.1520/F1793-97R21. is not required during application of shell test pressure, but it
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
must meet all performance requirements after the shell test
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
pressure has been removed.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Available from American Society of Mechanical Engineers (ASME), ASME
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International Headquarters, Two Park Ave., New York, NY 10016-5990, http:// Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
www.asme.org. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
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F1793−97 (2021)
3.1.5 pressure ratings, n—the pressure ratings of the auto- 4.1.2.1 Style 1—Automatic Reset Construction—These
maticshut-offvalvesshallbeasdefinedinthedocumentslisted valves are designed to
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