ASTM F1794-97(2016)e1

Standard Specification for Hand-Operated, Globe-Style Valves for Gas (Except Oxygen Gas) and Hydraulic Systems

ABSTRACT
This specification covers the design, construction, testing, and operating requirements for hand operated, quick-change cartridge trim, in-line body and angle-body, globe-style valves for use in gas (except oxygen gas) and hydraulic systems. These valves may be used for on-off, and/or throttling applications. Valves under this specification shall be Type I or Type II; Style I or Style II; and shall have the specified size, pressure rating, and end connections. Valves furnished under this specification shall be soft-seated, globe-style valves using a cartridge in which all working parts including the seat are removable as an assembly. The pressure containing envelope shall be made of corrosion-resistant steel, nickel-copper, nickel-aluminum-bronze, or bronze. Internal parts in contact with the line media shall be made of corrosion-resistant steel, nickel-copper, copper-nickel, bronze, nickel-aluminum bronze, or naval brass. Valve construction requirements for the following are detailed: (1) soft-seating insert, (2) pressure envelope, (3) threads, (4) accessibility, (5) nonmetallic element interchangeability, (6) maintainability, (7) reversibility, (8) adjustments, (9) bidirectional operation and bubbletight shut off, (10) guiding, (11) valve operating force, (12) pressurizing rate, (13) operation, and (14) envelope dimensions. Valves shall meet the performance requirements of flow capacity, seat tightness, and external leakage. Each valve shall pass the following tests: visual examination, hydrostatic shell test, seat tightness test, and external leakage test. The envelope dimensions for angle body and inline body construction are illustrated.
SCOPE
1.1 This specification covers the design, construction, testing, and operating requirements for hand-operated, quick-change cartridge trim, in-line body and angle-body, globe-style valves for use in gas (except oxygen gas) and hydraulic systems. These valves may be used for on-off, or throttling applications, or both.  
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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2016
• ICS: 23.060.20 - Ball and plug valves
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation:F1794 −97 (Reapproved 2016) An American National Standard
Standard Specification for
Hand-Operated, Globe-Style Valves for Gas (Except Oxygen
Gas) and Hydraulic Systems
This standard is issued under the fixed designation F1794; 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.
ε NOTE—Keywords were added editorially in September 2016.
1. Scope MIL-STD-740-1 Airborne Noise Measurements and Accep-
tance Criteria of Shipboard Equipment
1.1 This specification covers the design, construction,
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
testing, and operating requirements for hand-operated, quick-
Machinery, Equipment and Systems, Requirements for
change cartridge trim, in-line body and angle-body, globe-style
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,
valves for use in gas (except oxygen gas) and hydraulic
General Specification for
systems. These valves may be used for on-off, or throttling
applications, or both. 2.4 Government Drawings:
Naval Sea Systems Command (NAVSEA)
1.2 The values stated in inch-pound units are to be regarded
NAVSEA 803-1385884 Unions, Fittings and Adapters Butt
as standard. The values given in parentheses are mathematical
and Socket Welding 6000 PSI, WOG, NPS
conversions to SI units that are provided for information only
NAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI,
and are not considered standard.
WOG, NPS, for UT Inspection
NAVSEA 803-1385946 Unions, Bronze Silver Brazing,
2. Referenced Documents
WOG for UT Inspection
2.1 ASTM Standards:
F992 Specification for Valve Label Plates
3. Terminology
2.2 ANSI Standards:
3.1 Definitions:
ANSI B1.1 Unified Screw Threads (UN and UNR Thread
3.1.1 bubble-tight—no visible leakage over a 3-min period
Form)
usingeitherwatersubmersionortheapplicationofbubblefluid
ANSI B1.20.1 Pipe Threads, General Purpose (Inch)
for detection.
ANSI B16.11 Forged Steel Fittings, Socket-Welding and
Threaded 3.1.2 external leakage—leakage from the valve that escapes
ANSI B16.25 Buttwelding Ends to atmosphere.
ANSI B16.34 Valves—Flanged, Threaded, and Welded End
3.1.3 flowcapacity—theabilityofavalvetopassflowunder
2.3 Military Standards and Specifications:
any given set of pressure conditions. The flow capacity of a
MIL-STD-167-1 Mechanical Vibrations of Shipboard
valve is directly related to its Flow Coefficient (C ). The Flow
v
Equipment (Type I—Environmental and Type II—
coefficient is the quantity of water passing through a valve,
Internally Excited)
expressed in gallons/minute (litres/minute), when 1 psi (6.895
kPa) pressure drop at 60°F (16°C) is applied across the valve.
3.1.4 globe-style valves—abasiccontrolvalvetypethatgets
This specification is under the jurisdiction of ASTM Committee F25 on Ships
its name from the globular shape of its body with an internal
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems. bridgewall construction. It normally uses a basic rising stem/
Current edition approved Sept. 1, 2016. Published September 2016. Originally
plug for the closure member.
approved in 1997. Last previous edition approved in 2010 as F1794 – 97 (2010).
DOI: 10.1520/F1794-97R16E01. 3.1.5 hydrostatic shell test pressures—the hydrostatic test
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
pressures that the valve is required to withstand without
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
damage. Valve operation is not required during application of
Standards volume information, refer to the standard’s Document Summary page on
shell test pressure, but the valve must meet all performance
the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
requirements after the shell test pressure has been removed.
4th Floor, New York, NY 10036, http://www.ansi.org.
3.1.6 internal leakage—leakage from higher pressure to
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. lower pressure portions of the valve.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
F1794−97 (2016)
3.1.7 operating pressures—the pressures within the valve 5. Ordering Information
during service.
5.1 Ordering documentation for valves under this specifica-
3.1.8 pressure ratings—the pressure ratings of the valve
tion shall include the following information, as required to
shall be as defined in the documents listed in Table 1. The
describe the equipment adequately.
pressure ratings (also called pressure-temperature ratings)
5.1.1 ASTM designation and year of issue,
establish the maximum allowable working (service) pressures
5.1.2 Valve type (see 4.1.1),
of a component (valve, end connections, and so forth) at
5.1.3 Valve style (see 4.1.2),
various temperatures.
5.1.4 Valve size (see 4.1.3),
3.1.9 quick-change cartridge trim—a construction that fa-
5.1.5 Valve pressure rating (see 4.1.4),
cilitates rapid and reliable seat-ring/seat removal and replace-
5.1.6 Valve end connections (see 4.1.5),
ment by retaining the seat-ring/seat in the valve cartridge, as
5.1.7 Line medium,
opposed to a seat-ring which is threaded, welded, brazed, or
5.1.8 Temperature of line medium,
made integral with the valve body.
5.1.9 Supplementary requirements, if any (see S1 through
3.1.10 seat tightness—the ability of a valve to prevent
S4),
internal leakage from the valve-inlet to the valve-outlet.
5.1.10 Maximum vibration frequency and displacement
4. Classification amplitude, if other than specified (see S1.4), and
5.1.11 Maximum permissible noise level, if other than
4.1 Valves shall be of the following types, styles, sizes,
specified (see S1.5).
pressureratings,andendconnections,asspecifiedinSection5.
4.1.1 Types—Valves shall have either Type I (angle body
6. Valve Construction
construction) or Type II (inline body construction).
4.1.2 Styles—Valves shall be either Style I (shut-off valves)
6.1 Valves shall incorporate the design features specified in
or Style 2 (throttling valves).
6.1.1 – 6.1.17.
1 1
4.1.3 Sizes—Valve sizes shall be ⁄8 NPS (10.2 mm), ⁄4 NPS
6.1.1 General Requirements:
3 1 3
(13.5 mm), ⁄8 NPS (17.2 mm), ⁄2 NPS (21.3 mm), ⁄4 NPS
6.1.1.1 Valves furnished under this specification shall be
1 1
(26.9 mm), 1 NPS (33.7 mm), 1 ⁄4 NPS (42.4 mm), 1 ⁄2 NPS
soft-seated, globe-style valves using a cartridge in which all
(48.3 mm), and 2 NPS (60.3 mm).
working parts including the seat are removable as an assembly.
4.1.4 Pressure Ratings—Valves shall have a pressure rating
6.1.2 Materials of Construction—Material requirements for
selected from those listed in Table 1 and specified in Section 5.
these valves shall be as follows: The pressure containing
The inlet and outlet pressure ratings of the valve shall be
envelope shall be 300 series corrosion-resistant steel, nickel-
identical for any given valve.
copper (70-30), nickel-aluminum-bronze, or bronze. Internal
4.1.5 End Connections—Valves shall have end connections
parts in contact with the line media shall be 300 series
selected from those listed in Table 1 and specified in Section 5.
corrosion-resistant steel, nickel-copper (70-30), copper-nickel
The inlet and outlet end connections of the valve shall be
(70-30), bronze, nickel-aluminum-bronze, or naval brass.
identical for any given valve.
Other materials not listed above may be selected to assure
compatibilitywiththelinemedium,weldability,andtoprovide
TABLE 1 End Connections and Pressure Ratings for Valves
corrosion resistance without requiring painting, coating, or
plating. Materials for contacting parts shall be selected to
Applicable Documents for
Type of End
Pressure Rating Dimensional Details of End
minimize electrolytic corrosion and galling.
Connection
Connections
6.1.3 Soft-Seating Insert—A soft-seating (non-metallic)
Butt-welded ANSI B16.34 Class 150, ANSI B16.25
insert, if applicable, shall be field replaceable and incorporated
300, 400, 600, 900, 1500,
2500, or 4500
in the valve plug. Soft-seating inserts shall be protected from
Socket-welded ANSI B16.34 Class 150, ANSI B16.11
direct flow impingement, excessive loading and extrusion, or
300, 400, 600, 900, 1500,
any other effect jeopardizing their useful life. Soft-seating
2500, or 4500
Threaded (tapered ANSI B16.34 Class 150, ANSI B1.20.1 and ANSI
inserts shall be of the simplest practical configuration to
pipe thread) 300, 400, 600, 900, 1500, B16.11
facilitate emergency replacement manufacture where neces-
or 2500
A
sary.
Union-end, MIL-F-1183 (O-ring type) MIL-F-1183 (O-ring type) 400
Silver-brazed
400 lb/in. (2.758 MPa) lb/in. (2.758 MPa)
6.1.4 Pressure Envelope—The valve shall be designed to
A 2 2
Union-end, 803-1385946 1500 lb/in. 803-1385946 1500 lb/in.
pass a hydrostatic shell test at a pressure of at least 1.5 times
Silver-brazed
(10.342 MPa) (10.342 MPa)
A 2 2
Union-end, 803-1385943 3000 lb/in. 803-1385943 3000 lb/in.
the 100°F (38°C) pressure rating of the valve without any
Silver-brazed
(20.684 MPa) (20.684 MPa)
damage.
A 2 2
Union-end, 803-1385884 6000 lb/in. 803-1385884 6000 lb/in.
Butt/socket weld 6.1.5 Threads—Threads shall be as specified inANSI B1.1.
(41.369 MPa) (41.369 MPa)
Other, as specified As specified As specified
Where necessary, provisions shall be incorporated to prevent
A
For union inlet and outlet end connections, only the pertinent dimensions listed the accidental loosening of threaded parts. The design shall be
in the applicable documents (Military Specification or NAVSEA Requirements)
suchthatstandardwrenchescanbeusedonallexternalbolting.
shall apply. The valve shall be supplied with the thread-pieces only, without the
Lock-wire shall not be used. Any exposed threads shall be
tail-pieces and union-nuts.
protected by plastic caps for shipping.
´1
F1794−97 (2016)
6.1.6 Accessibility—All internal parts of the valve shall be
accessible for adjustment or service, without removing the
valve body from the line.
6.1.7 Interchangeability—The valve, including all associ-
ated piece parts, shall have part number identity, and shall be
replaceable from stock or the manufacturer on a nonselective
and random basis. Parts having the same manufacturer’s part
number shall be directly interchangeable with each other with
respect to installation (physical) and performance (function).
Physically interchangeable assemblies, components, and parts
are those which are capable of being readily installed,
removed, or replaced without alteration, misalignment, or
damage to parts being installed or to adjoining parts. Fabrica-
tion operations such as cutting, filing, drilling, reaming,
hammering, bending, prying, or forcing shall not be required.
6.1.8 Nonmetallic Element Interchangeability—
Nonmetallic elements, including but not limited to, seat rings,
soft-seating inserts, cushions, and O-rings shall be treated as
separately identified and readily replaceable parts.
6.1.9 Maintainability—Valve maintenance shall require
standard tools to the maximum extent possible. Any special
FIG. 1Angle Body
tools required for maintenance shall be identified, and shall be
supplied with the valve.
6.1.10 Reversibility—Seat inserts shall not be physically
reversible unless they are also functionally reversible to
preclude incorrect assembly.
6.1.11 Adjustments—There shall be no adjustments required
in the valve during or after assembly.
6.1.12 Bidirectional Operation and Bubbletight Shut-Off—
The valve shall be capable of operation and bubbletight
shut-off with a differential pressure equal to the rated pressure
applied across the valve in either direction of flow.
6.1.13 Guiding—The valve poppet shall be guided to pre-
vent binding or seizing, and to ensure proper seating, under all
operating conditions. Proper alignment of all internal operating
parts shall be maintained with interchangeable parts and under
all tolerance stack-up conditions.
6.1.14 Valve Operating Force—The maximum permissible
total tangential force required on the handwheel/handle for
operating or seating/unseating the valve shall not exceed 50 lb
(222 N), when the valve is subjected to a differential pressure
equal to the rated pressure applied across the valve in either
direction of flow.
FIG. 2Inline Body
6.1.15 Pressurization Rate—To prevent the possibility of
auto-ignition, the valve shall be capable of being operated to
limit the rate of downstream pressure buildup in a depressur-
7. Performance
ized volume (with the rated pressure upstream) to 200 psi
7.1 Valves shall meet the performance requirements of 7.1.1
(1380 kPa) per second. Downstream volumes for this pressur-
– 7.1.3.
ization rate shall be taken as 10 pipe diameters.
7.1.1 Flow Capacity—The flow capacity of the valve, ex-
6.1.16 Operation—The valve shall close by a clockwise
pressed in terms of C shall be equal or greater than the values
v
rotation of handwheel/handle when viewed from directly over
shown in Table 3.
the handwheel/handle.
7.1.2 SeatTightness—Valveshallbebubbletightat1.1times
6.1.17 Envelope Dimensions—For union-end valves only,
the 100°F (38°C) pressure rating in both directions when
the overall envelope dimensions shall be as shown in Fig. 1 closed with a handwheel/handle force not exceeding that
(angle body construction) or Fig. 2 (inline body construction), specified in 6.1.14 (or the manufacturer’s published
as applicable, and Table 2. recommendations, when less).
´1
F1794−97 (2016)
TABLE 2 Envelope Dimensions (for Union-End Valves Only)
leakage over a 3-min period. The valve shall be tested in both
Envelope Dimensions, ±0.015 in. (±0.38 mm) directions of flow to assure bidirectional seat tightness. For
Valve Size, NPS
Dim. A Dim. B Dim. C
valves used for helium or helium mixture service, the testing
1 1 3
⁄8 (10.2 mm) 2.750 (69.85) 1 ⁄8 (28.59) 1 ⁄8 (34.92)
medium shall be helium or helium/nitrogen mixture.
1 1 11
⁄4 (13.5 mm) 3.375 (85.73) 1 ⁄2 (38.10) 1 ⁄16 (42.86)
3 5
⁄8 (17.2 mm) 4.000 (101.60) 1 ⁄8 (41.28) 2 (50.40) 8.1.4 External Leakage Test—With the valve in the partially
1 3 1
⁄2 (21.3 mm) 4.250 (107.95) 1 ⁄4 (44.45) 2 ⁄8 (53.98)
open position, air or nitrogen shall be applied at a test pressure
3 3 5
⁄4 (26.9 mm) 4.625 (117.75) 2 ⁄8 (60.33) 2 ⁄16 (59.05)
equal to the 100°F (38°C) pressure rating of the valve to the
3 5
1 (33.7 mm) 5.250 (133.35) 2 ⁄4 (69.85) 2 ⁄8 (66.65)
1 1
1 ⁄4 (42.4 mm) 6.500 (228.60) 3
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: F1794 − 97 (Reapproved 2010) F1794 − 97 (Reapproved 2016)An American National Standard
Standard Specification for
Hand-Operated, Globe-Style Valves for Gas (Except Oxygen
Gas) and Hydraulic Systems
This standard is issued under the fixed designation F1794; 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.
ε NOTE—Keywords were added editorially in September 2016.
1. Scope
1.1 This specification covers the design, construction, testing, and operating requirements for hand-operated, quick-change
cartridge trim, in-line body and angle-body, globe-style valves for use in gas (except oxygen gas) and hydraulic systems. These
valves may be used for on-off, and/or throttling applications.or throttling applications, or both.
1.2 The values stated in this specification in inch-pound units are to be regarded as the standard. The SI equivalents shown in
parenthesis standard. The values given in parentheses are mathematical conversions to SI units that are provided for information
only.only and are not considered standard.
2. Referenced Documents
2.1 ASTM Standards:
F992 Specification for Valve Label Plates
2.2 American National Standards Institute (ANSI):ANSI Standards:
ANSI B1.1 Unified Screw Threads (UN and UNR Thread Form)
ANSI B1.20.1 Pipe Threads, General Purpose (Inch)
ANSI B16.11 Forged Steel Fittings, Socket-Welding and Threaded
ANSI B16.25 Buttwelding Ends
ANSI B16.34 Valves—Flanged, Threaded, and Welded End
2.3 Military Standards and Specifications:
MIL-STD-167-1 Mechanical Vibrations of Shipboard Equipment (Type I—Environmental and Type II—Internally Excited)
MIL-STD-740-1 Airborne Noise Measurements and Acceptance Criteria of Shipboard Equipment
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing, General Specification for
2.4 Government Drawings:
Naval Sea Systems Command (NAVSEA):(NAVSEA)
NAVSEA 803-1385884 Unions, Fittings and Adapters Butt and Socket Welding 6000 PSI, WOG, NPS
NAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI, WOG, NPS, for UT Inspection
NAVSEA 803-1385946 Unions, Bronze Silver Brazing, WOG for UT Inspection
3. Terminology
3.1 Definitions:
3.1.1 bubble-tight—no visible leakage over a 3-min period using either water submersion or the application of bubble fluid for
detection.
3.1.2 external leakage—leakage from the valve that escapes to atmosphere.
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
Machinery and Piping Systems.
Current edition approved May 1, 2010Sept. 1, 2016. Published June 2010September 2016. Originally approved in 1997. Last previous edition approved in 20042010 as
F1794 - 97 (2004).F1794 – 97 (2010). DOI: 10.1520/F1794-97R10.10.1520/F1794-97R16E01.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
F1794 − 97 (2016)
3.1.3 flow capacity—the ability of a valve to pass flow under any given set of pressure conditions. The flow capacity of a valve
is directly related to its Flow Coefficient (C ). The Flow coefficient is the quantity of water passing through a valve, expressed in
v
gallons/minute (litres/minute), when 1 psi (6.895 kPa) pressure drop at 60°F (16°C) is applied across the valve.
3.1.4 globe-style valves—a basic control valve type that gets its name from the globular shape of its body with an internal
bridgewall construction. It normally uses a basic rising stem/plug for the closure member.
3.1.5 hydrostatic shell test pressures—the hydrostatic test pressures that the valve is required to withstand without damage.
Valve operation is not required during application of shell test pressure, but the valve must meet all performance requirements after
the shell test pressure has been removed.
3.1.6 internal leakage—leakage from higher pressure to lower pressure portions of the valve.
3.1.7 operating pressures—the pressures within the valve during service.
3.1.8 pressure ratings—the pressure ratings of the valve shall be as defined in the documents listed in Table 1. The pressure
ratings (also called pressure-temperature ratings) establish the maximum allowable working (service) pressures of a component
(valve, end connections, and so forth) at various temperatures.
3.1.9 quick-change cartridge trim—a construction that facilitates rapid and reliable seat-ring/seat removal and replacement by
retaining the seat-ring/seat in the valve cartridge, as opposed to a seat-ring which is threaded, welded, brazed, or made integral with
the valve body.
3.1.10 seat tightness—the ability of a valve to prevent internal leakage from the valve-inlet to the valve-outlet.
4. Classification
4.1 Valves shall be of the following types, styles, sizes, pressure ratings, and end connections, as specified in Section 5.
4.1.1 Types—Valves shall have either Type I (angle body construction) or Type II (inline body construction).
4.1.2 Styles—Valves shall be either Style I (shut-off valves) or Style 2 (throttling valves).
1 1 3 1 3
4.1.3 Sizes—Valve sizes shall be ⁄8 NPS (10.2 mm), ⁄4 NPS (13.5 mm), ⁄8 NPS (17.2 mm), ⁄2 NPS (21.3 mm), ⁄4 NPS (26.9
1 1
mm), 1 NPS (33.7 mm), 1 ⁄4 NPS (42.4 mm), 1 ⁄2 NPS (48.3 mm), and 2 NPS (60.3 mm).
4.1.4 Pressure Ratings—Valves shall have a pressure rating selected from those listed in Table 1 and specified in Section 5. The
inlet and outlet pressure ratings of the valve shall be identical for any given valve.
4.1.5 End Connections—Valves shall have end connections selected from those listed in Table 1 and specified in Section 5. The
inlet and outlet end connections of the valve shall be identical for any given valve.
5. Ordering Information
5.1 Ordering documentation for valves under this specification shall include the following information, as required to describe
the equipment adequately.
5.1.1 ASTM designation and year of issue,
5.1.2 Valve type (see 4.1.1),
TABLE 1 End Connections and Pressure Ratings for Valves
Applicable Documents for
Type of End
Pressure Rating Dimensional Details of End
Connection
Connections
Butt-welded ANSI B16.34 Class 150, ANSI B16.25
300, 400, 600, 900, 1500,
2500, or 4500
Socket-welded ANSI B16.34 Class 150, ANSI B16.11
300, 400, 600, 900, 1500,
2500, or 4500
Threaded (tapered ANSI B16.34 Class 150, ANSI B1.20.1 and ANSI
pipe thread) 300, 400, 600, 900, 1500, B16.11
or 2500
A
Union-end, MIL-F-1183 (O-ring type) MIL-F-1183 (O-ring type) 400
Silver-brazed
400 lb/in. (2.758 MPa) lb/in. (2.758 MPa)
A 2 2
Union-end, 803-1385946 1500 lb/in. 803-1385946 1500 lb/in.
Silver-brazed
(10.342 MPa) (10.342 MPa)
A 2 2
Union-end, 803-1385943 3000 lb/in. 803-1385943 3000 lb/in.
Silver-brazed
(20.684 MPa) (20.684 MPa)
A 2 2
Union-end, 803-1385884 6000 lb/in. 803-1385884 6000 lb/in.
Butt/socket weld
(41.369 MPa) (41.369 MPa)
Other, as specified As specified As specified
A
For union inlet and outlet end connections, only the pertinent dimensions listed
in the applicable documents (Military Specification or NAVSEA Requirements)
shall apply. The valve shall be supplied with the thread-pieces only, without the
tail-pieces and union-nuts.
´1
F1794 − 97 (2016)
5.1.3 Valve style (see 4.1.2),
5.1.4 Valve size (see 4.1.3),
5.1.5 Valve pressure rating (see 4.1.4),
5.1.6 Valve end connections (see 4.1.5),
5.1.7 Line medium,
5.1.8 Temperature of line medium,
5.1.9 Supplementary requirements, if any (see S1 through S4),
5.1.10 Maximum vibration frequency and displacement amplitude, if other than specified (see S1.4), and
5.1.11 Maximum permissible noise level, if other than specified (see S1.5).
6. Valve Construction
6.1 Valves shall incorporate the design features specified in 6.1.1 – 6.1.17.
6.1.1 General Requirements:
6.1.1.1 Valves furnished under this specification shall be soft-seated, globe-style valves using a cartridge in which all working
parts including the seat are removable as an assembly.
6.1.2 Materials of Construction—Material requirements for these valves shall be as follows: The pressure containing envelope
shall be 300 series corrosion-resistant steel, nickel-copper (70-30), nickel-aluminum-bronze, or bronze. Internal parts in contact
with the line media shall be 300 series corrosion-resistant steel, nickel-copper (70-30), copper-nickel (70-30), bronze,
nickel-aluminum-bronze, or naval brass. Other materials not listed above may be selected to assure compatibility with the line
medium, weldability, and to provide corrosion resistance without requiring painting, coating, or plating. Materials for contacting
parts shall be selected to minimize electrolytic corrosion and galling.
6.1.3 Soft-Seating Insert—A soft-seating (non-metallic) insert, if applicable, shall be field replaceable and incorporated in the
valve plug. Soft-seating inserts shall be protected from direct flow impingement, excessive loading and extrusion, or any other
effect jeopardizing their useful life. Soft-seating inserts shall be of the simplest practical configuration to facilitate emergency
replacement manufacture where necessary.
6.1.4 Pressure Envelope—The valve shall be designed to pass a hydrostatic shell test at a pressure of at least 1.5 times the 100
°F (38 °C) 100°F (38°C) pressure rating of the valve without any damage.
6.1.5 Threads—Threads shall be as specified in ANSI B1.1. Where necessary, provisions shall be incorporated to prevent the
accidental loosening of threaded parts. The design shall be such that standard wrenches can be used on all external bolting.
Lock-wire shall not be used. Any exposed threads shall be protected by plastic caps for shipping.
6.1.6 Accessibility—All internal parts of the valve shall be accessible for adjustment or service, without removing the valve
body from the line.
6.1.7 Interchangeability—The valve, including all associated piece parts, shall have part number identity, and shall be
replaceable from stock or the manufacturer on a nonselective and random basis. Parts having the same
manufacturer’smanufacturer’s part number shall be directly interchangeable with each other with respect to installation (physical)
and performance (function). Physically interchangeable assemblies, components, and parts are those which are capable of being
readily installed, removed, or replaced without alteration, misalignment, or damage to parts being installed or to adjoining parts.
Fabrication operations such as cutting, filing, drilling, reaming, hammering, bending, prying, or forcing shall not be required.
6.1.8 Nonmetallic Element Interchangeability—Nonmetallic elements, including but not limited to, seat rings, soft-seating
inserts, cushions, and O-rings shall be treated as separately identified and readily replaceable parts.
6.1.9 Maintainability—Valve maintenance shall require standard tools to the maximum extent possible. Any special tools
required for maintenance shall be identified, and shall be supplied with the valve.
6.1.10 Reversibility—Seat inserts shall not be physically reversible unless they are also functionally reversible to preclude
incorrect assembly.
6.1.11 Adjustments—There shall be no adjustments required in the valve during or after assembly.
6.1.12 Bidirectional Operation and Bubbletight Shut-Off—The valve shall be capable of operation and bubbletight shut-off with
a differential pressure equal to the rated pressure applied across the valve in either direction of flow.
6.1.13 Guiding—The valve poppet shall be guided to prevent binding or seizing, and to ensure proper seating, under all
operating conditions. Proper alignment of all internal operating parts shall be maintained with interchangeable parts and under all
tolerance stack-up conditions.
6.1.14 Valve Operating Force—The maximum permissible total tangential force required on the handwheel/handle for operating
or seating/unseating the valve shall not exceed 50 lb (222 N), when the valve is subjected to a differential pressure equal to the
rated pressure applied across the valve in either direction of flow.
6.1.15 Pressurization Rate—To prevent the possibility of auto-ignition, the valve shall be capable of being operated to limit the
rate of downstream pressure buildup in a depressurized volume (with the rated pressure upstream) to 200 psi (1380 kPa) per
second. Downstream volumes for this pressurization rate shall be taken as 10 pipe diameters.
6.1.16 Operation—The valve shall close by a clockwise rotation of handwheel/handle when viewed from directly over the
handwheel/handle.
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F1794 − 97 (2016)
6.1.17 Envelope Dimensions—For union-end valves only, the overall envelope dimensions shall be as shown in Fig. 1 (angle
body construction) or Fig. 2 (inline body construction), as applicable, and Table 2.
7. Performance
7.1 Valves shall meet the performance requirements of 7.1.1 – 7.1.3.
7.1.1 Flow Capacity—The flow capacity of the valve, expressed in terms of C shall be equal or greater than the values shown
v
in Table 3.
7.1.2 Seat Tightness—Valve shall be bubbletight at 1.1 times the 100 °F (38 °C) 100°F (38°C) pressure rating in both directions
when closed with a handwheel/handle force not exceeding that specified in 6.1.14 (or the manufacturer’smanufacturer’s published
recommendations, when less).
7.1.3 External Leakage—Valve external leakage shall be bubbletight at its 100 °F (38 °C) 100°F (38°C) pressure rating.
8. Tests Required
8.1 Each valve shall pass the tests outlined in 8.1.1 – 8.1.4.
8.1.1 Visual Examination—The valve shall be examined visually to determine conformance with the ordering data and
workmanship without di
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