ASTM F1985-99(2011)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:F1985 −99 (Reapproved 2011) An American National Standard
Standard Specification for
Pneumatic-Operated, Globe-Style, Control Valves
This standard is issued under the fixed designation F1985; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.3 Manufacturers Standardization Society of the Valve and
Fitting Industry:
1.1 This specification covers the design, construction,
MSS SP-25Standard Marking System for Valves, Fittings,
testing, and operating requirements for pneumatic-operated,
Flanges and Unions
globe-style, control valves complete with actuators for various
2.4 Fluid Controls Institute Standard:
fluid systems (steam, gas, and liquid applications).The control
FCI 70-2Control Valve Seat Leakage
valves with actuators may be procured under this specification
2.5 Military Standards and Specifications:
complete with all associated pneumatic instrumentation neces-
MIL-STD-798 Nondestructive Testing, Welding Quality
sary for the valve to function in the system application;
Control Material Control and Identification and Hi-Shock
however, complete and detailed requirements for air instru-
Test Requirements for Piping System Components for
mentation are beyond the scope of this specification and thus
Naval Ship Use
are not included here. This specification is not intended to
MIL-S-901Shock Tests, H.I. (High Impact); Shipboard
cover quarter-turn or multi-turn stem valves.
Machinery, Equipment and Systems, Requirements for
MIL-STD-167-1 Mechanical Vibrations of Shipboard
1.2 The values stated in SI units are to be regarded as the
Equipment (Type I– Environmental and Type II – Inter-
standard. The values given in parentheses are for information
nally Excited)
only.
MS-16142Boss Gasket-Seal Straight Thread Tube Fitting,
Standard Dimensions for
2. Referenced Documents
MIL-F-1183Fittings, Pipe, Cast Bronze, Silver Brazing,
2.1 The most recent edition or revision of the following
General Specification for
standards or specifications shall, to the extent specified in this
MIL-F-20042Flanges, Pipe and Bulkhead, Bronze (Silver
specification, form a part of this specification.
Brazing)
2.6 Government Drawings and Publications:
2.2 ASME Standards: 5
Naval Sea Systems Command (NAVSEA):
B1.1Unified Screw Threads (UN and UNR Thread Form)
803-1385946Unions, Bronze, Silver Brazing Alloy. For
B1.20.1Pipe Threads, General Purpose (Inch)
Water, Oil, and Gas
B16.1CastIronPipeFlangesandFlangedFittings,Class25,
803-1385943Unions, Silver Brazing, 3000 lb/in. , WOG,
125, 250 and 800
NPS, for UT Inspection
B16.5Pipe Flanges and Flanged Fittings
803-1385884Unions, Butt and SocketWelding, 6000 lb/in.
B16.11Forged Steel Fittings, Socket-Welding andThreaded
WOG, NPS, For UT Inspections
B16.25Buttwelding Ends
2.7 ISA Standard:
B16.24Bronze Pipe Flanges and Flanged fittings, Class 150
ISA-S75.05Standard for Control Valve Terminology
and 300
3. Terminology
B16.34Valves - Flanged and Buttwelding End Steel, Nickel
Alloy, and Other Special Allows
3.1 Definitions of Terms Specific to This Standard:
AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
This specification is under the jurisdiction of ASTM committee F25 on Ships Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on hq.com.
Machinery and Piping Systems. Available from Fluid Controls Institute, 1300 Sumner Ave., Cleveland, OH
Current edition approved Nov. 1, 2011. Published November 2011. Originally 44115.
approved in 1999. Last previous edition approved in 2005 as F1985–99(2005). AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
DOI: 10.1520/F1985-99R11. 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
Available from American Society of Mechanical Engineers (ASME), ASME www.access.gpo.gov.
International Headquarters, Three Park Ave., New York, NY 10016-5990, http:// Available from International Society for Measurement and Control, 67 Alex-
www.asme.org. ander Dr., PO Box 12277, Research Triangle Park, NC 27709.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1985−99 (2011)
TABLE 1 Pressure Ratings for Control Valves
3.1.1 actuator—the unit that converts a pneumatic pressure
signal into a force to position the valve plug. Applicable Documents for
Type of
Pressure Rating Dimensional Details of End
End Connection
3.1.2 bonnet—the upper portion of the valve body subas-
Connections
sembly to which the yoke attaches. The bonnet contains the
Butt-welded ASME B16.34 ASME B16.25
valve stem packing. Class 150, 300, 400, 600,
900, 1500, 2500, or 4500
3.1.3 dead band—the range through which input signal can
Socket-welded ASME B16.34 ASME B16.11
be varied, upon reversal of direction, without an observable
Class 150, 300, 400, 600,
change in the value stem position.
900, 1500, 2500, or 4500
3.1.4 equal-percentage opening—an equal-percentage flow
Flanged ASME B16.34 ASME B16.5
characteristicofacontrolvalveprovidesachangeinflow,with
Class 150, 300, 400, 600,
thechangeinvalvelift,thatisaconstantpercentageoftheflow
900, 1500, 2500
before the change was made.
Flanged ASME B16.1 ASME B16.1
3.1.5 flow coeffıcient (C )—A basic capacity rating for
(cast iron valves only) Class 125, 250
V
valves that relates flow rate to the inlet and outlet pressure for
Flanged ASME B16.24 ASME B16.24
a particular fluid in the full-open position of the valve. It is
(bronze) Class 150, and 300
defined as the number of litres per seconds (gallons/min) of
Flanged-navy MIL-F-20042 MIL-F-20042
16°C (60°F) water that will flow through the valve with a 6.9
(bronze) Class 150, 250, 400
kPa (1 psi) pressure drop (∆p) across the valve.
Threaded ASME B16.34 ASME B1.20.1
3.1.6 globe-style valve—a basic control valve type that gets
(tapered pipe thread) Class 150, 300, 400, 600, and ASME B16.11
its name from the globular shape of its body. It normally uses
900, 1500, or 2500
a basic rising stem/plug for the closure member.
A
Union-end , MIL-F-1183 MIL-F-1183
3.1.7 hydrostatic shell test pressure—the hydrostatic test silver-brazed
(O-ring type) (O-ring type)
2 2
400 lb/in. 400 lb/in.
pressure that the valve body is required to withstand without
damage or leakage. Valve operation is not required during
A
Union-end, 803-1385946 803-1385946
2 2
application of this test pressure, but the valve shall meet all
silver-brazed
1500 lb/in. 1500 lb/in.
performancerequirementsafterthepressurehasbeenremoved.
A
Union-end, 803-1385943 803-1385943
2 2
3.1.8 hysteresis—the maximum difference in output value silver-brazed
3000 lb/in. 3000 lb/in.
for any single input value during a calibration cycle, excluding
A
Union-end, 803-1385884 803-1385884
errors as a result of dead band.
2 2
butt/socket weld
6000 lb/in. 6000 lb/in.
3.1.9 instrumentation—theterminstrumentation,whenused
Other, as specified as specified as specified
in this specification, refers to any instrumentation, that is, pilot
A
Forunioninletandoutletendconnections,onlythepertinentdimensionslisted
controllers, transmitters, relays, selectors, positioners, instru-
intheapplicabledocuments(MilitarySpecificationorNAVSEArequirements)shall
ment air reducing valves, and strainers/filters required for
apply.UnlessotherwisespecifiedintheorderingdataSection5,thetailpiecesand
the union-nuts shall not be furnished—only the thread-pieces shall be furnished. If
operation of the control valve in the system.
tailpieces and union-nuts are required, their materials of construction shall be in
3.1.10 internal trim—internal parts of the control valve, accordance with the applicable documents listed above and shall be specified in
the ordering data Section 5.
including seat rings, plug, stem, guide bushings, cage, pistons,
and so forth.
3.1.11 linear-opening—a linear-opening flow characteristic
of a control valve provides a change in flow that is linearly
ratings (also called pressure-temperature ratings) establish the
proportional with valve lift.
maximum allowable working (service) pressures of a compo-
3.1.12 linearity—the measure of how close a plot of the nent (valve, end connections, and so forth) at various tempera-
valvestemtravel(inresponsetoanincreasingandadecreasing
tures.
input signal) conforms to a straight line. Linearity is normally
3.1.16 quick change cage trim—agasketoranO-ringsealed
expressed as the ratio (in percentage) of the maximum devia-
seat ring held in position by a cage, which may be either
tion from a straight line connecting the end points of the full
separate from or integral with the seat ring.The cage is held in
operational valve stem stroke.
position by either the bonnet or bottom flange. This design
3.1.13 manual override—the manual override allows valve shall permit the rapid replacement of all internal trim by
operationmanually.Themanualoverridefeaturehastheability
avoiding the use of any threads located within the valve body,
to oppose and overcome an opening or closing pneumatic such as seat ring threads.
control signal in controlling valve position.
3.1.17 quick-opening—a quick-opening flow characteristic
3.1.14 pneumatic-operated control valve—a valve installed of a control valve provides large changes in flow for small
directlyinthefluidsystem,whichtranslatesapneumaticsignal
changes in valve lift.
into a change in flow resistance for the system fluid.
3.1.18 rangeability—a measure of the usable range of a
3.1.15 pressurerating—thepressureratingofthevalveshall control valve and defined as the ratio of the maximum to the
be as defined in the documents listed in Table 1. The pressure minimum controllable C . These maximum and minimum
V
F1985−99 (2011)
controllable C s establish the throttling range over which a 5.1.1 ASTM designation and year of issue,
V
given control characteristic can be maintained and within 5.1.2 Material grade (see 4.1 and Table 1),
which the valve can perform a useful throttling function. 5.1.3 Pressure rating (see 4.2),
5.1.4 Pressure drop (∆p), kPa (psi),
3.1.19 travel indicator—the moving pointer mechanically
5.1.5 Type (see 4.3),
attached to the valve stem and working in conjunction with a
5.1.6 Seat leakage class (see 4.4),
fixed indicator scale attached to the yoke.
5.1.7 Flow characteristics (see 4.5),
3.1.20 three-way valve—a three-way valve has three end
5.1.8 End connections (see 4.6),
connections configured for converging or diverging flow.
5.1.9 Size, inlet, and outlet (see 4.7),
3.1.21 valve body subassembly—the combination of valve
5.1.10 Rangeability (see 7.2),
body, bonnet, end connections, and internal trim.
5.1.11 Line medium (see 6.2),
3.1.22 yoke—the intermediate piece between the valve bon- 5.1.12 Operating pressures of the line media (minimum,
normal, and maximum) (see 6.16),
net and the actuator.
5.1.13 Inlet temperature of the line media (minimum, nor-
3.2 Additional guidance on the control valve terminology
mal, and maximum) (see 6.16),
can be found in ISA-S75.05.
5.1.14 Flow rate required (minimum, normal, and maxi-
mum) (see 7.1),
4. Classification
5.1.15 Replaceable seat ring requirement (see 6.13),
4.1 Valves shall be of the following material grades, pres-
5.1.16 Minimum available air supply pressure to the actua-
sure ratings, types, seat leakage classes, flow characteristics,
tor (see 6.16),
and sizes, as specified in Section 5.
5.1.17 Minimum and maximum actuator control signal
4.1.1 Material Grades (Applicable to Pressure Containing
pressure, kPa (psi) (benchset of the actuator),
Parts Only):
5.1.18 When manual override feature is required, its
4.1.1.1 Grade A—Alloy Steel—Material Group 1.9 of
location—top or side-mounted (see 6.14.3),
1 1 1
ASME B16.34 (1 Cr- ⁄2 Mo, or 1- ⁄4 Cr- ⁄2 Mo).
5.1.19 Valvefail-positionrequireduponlossofairsupplyto
4.1.1.2 Grade B—Carbon Steel—Material Group 1.1 of
the actuator (see 6.14.4)
ASME B16.34.
5.1.20 Instrumentation requirements (see 6.15),
4.1.1.3 Grace C—Corrosion-Resistance Stainless Steel—
5.1.21 Supplementaryrequirements,ifany(seeSupplemen-
Material Group 2.2 of ASME B16.34 (18 Cr-8 Ni alloy).
tary Requirements, S1, S2, or S3).
4.1.1.4 Grade D—As specified in the ordering information
(see Section 5.)
6. Valve Construction
4.2 Pressure Ratings—Valve shall have pressure ratings
6.1 Valves shall incorporate the design features specified
selectedfromthoselistedinTable1andspecifiedinSection5.
below:
6.1.1 General Requirements:
4.3 Types:
6.1.1.1 Design shall permit adjustment without requiring
4.3.1 Type 1—Two-way valve, in-line (two end connec-
removal of the valve body from the line.
tions).
4.3.2 Type 2—Two-wayvalve,angle(twoendconnections).
6.2 Materials of Construction—Materials for pressure-
4.3.3 Type 3—Three-way valve, converging service (three
containing parts shall be in accordance with the applicable
end connections—two inlet and one outlet end connections).
documents listed in Table 1 (see 4.1). Materials for internal
4.3.4 Type4—Three-wayvalve,divergingservice(threeend
parts shall be compatible with the line media specified in
connections—one inlet and two outlet end connections).
Section 5.
4.4 Seat Leakage Classes (Maximum Allowable Seat
6.3 Pressure Envelope—Thecontrolvalveshallbedesigned
Leakage)—Seat leakage class shall be selected from those
to pass a hydrostatic shell test at pressure(s) of at least 1.5
listed in FCI 70-2 and specified in Section 5.
times the 38°C (100°F) pressure rating(s) of the valve without
damage.
4.5 Flow Characteristics—The inherent flow characteristics
of the valve shall be specified as quick-opening, linear-
6.4 Joints—The bonnet and bottom cover/flange shall be
opening, equal-percentage opening, or as specified in Section
attached to the body using bolted flanges, a threaded connec-
5. (Additional guidance on valve flow characteristics can be
tion, or a threaded-union connection.
found in ISA Handbook of Control Valves).
6.5 Valve Springs—Any spring incorporated in the control
4.6 End Connections—Valve shall have end connections
valve shall not be compressed solid during operation. Spring
selectedfromthoselistedinTable1andspecifiedinSection5.
ends shall be squared and ground.
4.7 Sizes—Valve size shall be as specified in Section 5.
6.6 Threads—Threads shall be as specified in ASME B1.1.
Where necessary, provisions shall be incorporated to prevent
5. Ordering Information
the accidental loosening of threaded parts. The design shall be
5.1 Ordering documentation for valves under this specifica- suchthatstandardwrench
...