ASTM F1985-99(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation: F1985 – 99 (Reapproved 2005)
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 MSS SP-25 Standard Marking System for Valves, Fittings,
Flanges and Unions
1.1 This specification covers the design, construction, test-
2.4 Fluid Controls Institute Standard:
ing,andoperatingrequirementsforpneumatic-operated,globe-
FCI 70-2 Control Valve Seat Leakage
style, control valves complete with actuators for various fluid
2.5 Military Standards and Specifications:
systems (steam, gas, and liquid applications). The control
MIL-STD-798 Nondestructive Testing, Welding Quality
valves with actuators may be procured under this specification
Control Material Control and Identification and Hi-Shock
complete with all associated pneumatic instrumentation neces-
Test Requirements for Piping System Components for
sary for the valve to function in the system application;
Naval Ship Use
however, complete and detailed requirements for air instru-
MIL-S-901 Shock Tests, H.I. (High Impact); Shipboard
mentation are beyond the scope of this specification and thus
Machinery, Equipment and Systems, Requirements for
are not included here. This specification is not intended to
MIL-STD-167-1 Mechanical Vibrations of Shipboard
cover quarter-turn or multi-turn stem valves.
Equipment (Type I– Environmental and Type II – Inter-
1.2 The values stated in SI units are to be regarded as the
nally Excited)
standard. The values given in parentheses are for information
MS-16142 Boss Gasket-Seal Straight Thread Tube Fitting,
only.
Standard Dimensions for
2. Referenced Documents
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver Brazing,
General Specification for
2.1 The most recent edition or revision of the following
MIL-F-20042 Flanges, Pipe and Bulkhead, Bronze (Silver
standards or specifications shall, to the extent specified in this
Brazing)
specification, form a part of this specification.
2.6 Government Drawings and Publications:
2.2 ASME Standards:
Naval Sea Systems Command (NAVSEA):
B1.1 Unified Screw Threads (UN and UNR Thread Form)
803-1385946 Unions, Bronze, Silver Brazing Alloy. For
B1.20.1 Pipe Threads, General Purpose (Inch)
Water, Oil, and Gas
B16.1 Cast Iron Pipe Flanges and Flanged Fittings, Class
803-1385943 Unions, Silver Brazing, 3000 lb/in. , WOG,
25, 125, 250 and 800
NPS, for UT Inspection
B16.5 Pipe Flanges and Flanged Fittings
803-1385884 Unions,ButtandSocketWelding,6000lb/in.
B16.11 ForgedSteelFittings,Socket-WeldingandThreaded
WOG, NPS, For UT Inspections
B16.25 Buttwelding Ends
2.7 ISA Standard:
B16.24 BronzePipeFlangesandFlangedfittings,Class150
ISA-S75.05 Standard for Control Valve Terminology
and 300
B16.34 Valves-FlangedandButtweldingEndSteel,Nickel
3. Terminology
Alloy, and Other Special Allows
3.1 Definitions of Terms Specific to This Standard:
2.3 Manufacturers Standardization Society of the Valve and
3.1.1 actuator—the unit that converts a pneumatic pressure
Fitting Industry:
signal into a force to position the valve plug.
3.1.2 bonnet—the upper portion of the valve body subas-
sembly to which the yoke attaches. The bonnet contains the
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
valve stem packing.
Machinery and Piping Systems.
Current edition approved May 1, 2005. Published May 2005. Originally
approved in 1999. Last previous edition approved in 1999 as F1985–99. DOI: Available from Fluid Controls Institute, 1300 Sumner Ave., Cleveland, OH
10.1520/F1985-99R05. 44115.
Available from American Society of Mechanical Engineers (ASME), ASME
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
International Headquarters, Three Park Ave., New York, NY 10016-5990. 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.
3 6
AvailablefromManufacturersStandardizationSocietyoftheValveandFittings Available from International Society for Measurement and Control, 67 Alex-
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602. 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 (2005)
TABLE 1 Pressure Ratings for Control Valves
3.1.3 dead band—the range through which input signal can
be varied, upon reversal of direction, without an observable Applicable Documents for
Type of
Pressure Rating Dimensional Details of End
change in the value stem position.
End Connection
Connections
3.1.4 equal-percentage opening—an equal-percentage flow
Butt-welded ASME B16.34 ASME B16.25
characteristicofacontrolvalveprovidesachangeinflow,with
Class 150, 300, 400, 600,
thechangeinvalvelift,thatisaconstantpercentageoftheflow
900, 1500, 2500, or 4500
before the change was made.
Socket-welded ASME B16.34 ASME B16.11
3.1.5 flow coeffıcient (C )—A basic capacity rating for
V Class 150, 300, 400, 600,
900, 1500, 2500, or 4500
valves that relates flow rate to the inlet and outlet pressure for
a particular fluid in the full-open position of the valve. It is
Flanged ASME B16.34 ASME B16.5
defined as the number of litres per seconds (gallons/min) of
Class 150, 300, 400, 600,
900, 1500, 2500
16°C (60°F) water that will flow through the valve with a 6.9
kPa (1 psi) pressure drop (Dp) across the valve.
Flanged ASME B16.1 ASME B16.1
3.1.6 globe-style valve—a basic control valve type that gets
(cast iron valves only) Class 125, 250
its name from the globular shape of its body. It normally uses
Flanged ASME B16.24 ASME B16.24
a basic rising stem/plug for the closure member.
(bronze) Class 150, and 300
3.1.7 hydrostatic shell test pressure—the hydrostatic test
Flanged-navy MIL-F-20042 MIL-F-20042
pressure that the valve body is required to withstand without
(bronze) Class 150, 250, 400
damage or leakage. Valve operation is not required during
application of this test pressure, but the valve shall meet all Threaded ASME B16.34 ASME B1.20.1
(tapered pipe thread) Class 150, 300, 400, 600, and ASME B16.11
performancerequirementsafterthepressurehasbeenremoved.
900, 1500, or 2500
3.1.8 hysteresis—the maximum difference in output value
A
Union-end , MIL-F-1183 MIL-F-1183
for any single input value during a calibration cycle, excluding
silver-brazed (O-ring type) (O-ring type)
errors as a result of dead band.
2 2
400 lb/in. 400 lb/in.
3.1.9 instrumentation—the term instrumentation, when
A
Union-end, 803-1385946 803-1385946
used in this specification, refers to any instrumentation, that is,
2 2
silver-brazed 1500 lb/in. 1500 lb/in.
pilot controllers, transmitters, relays, selectors, positioners,
A
instrumentairreducingvalves,andstrainers/filtersrequiredfor
Union-end, 803-1385943 803-1385943
2 2
silver-brazed 3000 lb/in. 3000 lb/in.
operation of the control valve in the system.
3.1.10 internal trim—internal parts of the control valve, A
Union-end, 803-1385884 803-1385884
2 2
butt/socket weld 6000 lb/in. 6000 lb/in.
including seat rings, plug, stem, guide bushings, cage, pistons,
and so forth.
Other, as specified as specified as specified
3.1.11 linear-opening—a linear-opening flow characteristic
A
Forunioninletandoutletendconnections,onlythepertinentdimensionslisted
of a control valve provides a change in flow that is linearly
intheapplicabledocuments(MilitarySpecificationorNAVSEArequirements)shall
proportional with valve lift. apply.UnlessotherwisespecifiedintheorderingdataSection5,thetailpiecesand
the union-nuts shall not be furnished—only the thread-pieces shall be furnished. If
3.1.12 linearity—the measure of how close a plot of the
tailpieces and union-nuts are required, their materials of construction shall be in
valvestemtravel(inresponsetoanincreasingandadecreasing
accordance with the applicable documents listed above and shall be specified in
the ordering data Section 5.
input signal) conforms to a straight line. Linearity is normally
expressed as the ratio (in percentage) of the maximum devia-
tion from a straight line connecting the end points of the full
shall permit the rapid replacement of all internal trim by
operational valve stem stroke.
avoiding the use of any threads located within the valve body,
3.1.13 manual override—the manual override allows valve
such as seat ring threads.
operationmanually.Themanualoverridefeaturehastheability
3.1.17 quick-opening—a quick-opening flow characteristic
to oppose and overcome an opening or closing pneumatic
of a control valve provides large changes in flow for small
control signal in controlling valve position.
changes in valve lift.
3.1.14 pneumatic-operated control valve—a valve installed
3.1.18 rangeability—a measure of the usable range of a
directlyinthefluidsystem,whichtranslatesapneumaticsignal
control valve and defined as the ratio of the maximum to the
into a change in flow resistance for the system fluid.
minimum controllable C . These maximum and minimum
V
3.1.15 pressure rating—the pressure rating of the valve
controllable C s establish the throttling range over which a
V
shall be as defined in the documents listed in Table 1. The given control characteristic can be maintained and within
pressure ratings (also called pressure-temperature ratings)
which the valve can perform a useful throttling function.
establish the maximum allowable working (service) pressures
3.1.19 travel indicator—the moving pointer mechanically
of a component (valve, end connections, and so forth) at
attached to the valve stem and working in conjunction with a
various temperatures.
fixed indicator scale attached to the yoke.
3.1.16 quick change cage trim—a gasket or an O-ring 3.1.20 three-way valve—a three-way valve has three end
sealedseatringheldinpositionbyacage,whichmaybeeither connections configured for converging or diverging flow.
separate from or integral with the seat ring.The cage is held in 3.1.21 valve body subassembly—the combination of valve
position by either the bonnet or bottom flange. This design body, bonnet, end connections, and internal trim.
F1985 – 99 (2005)
3.1.22 yoke—theintermediatepiecebetweenthevalvebon- 5.1.13 Inlet temperature of the line media (minimum, nor-
net and the actuator. mal, and maximum) (see 6.16),
3.2 Additional guidance on the control valve terminology
5.1.14 Flow rate required (minimum, normal, and maxi-
can be found in ISA-S75.05.
mum) (see 7.1),
5.1.15 Replaceable seat ring requirement (see 6.13),
4. Classification
5.1.16 Minimum available air supply pressure to the actua-
4.1 Valves shall be of the following material grades, pres-
tor (see 6.16),
sure ratings, types, seat leakage classes, flow characteristics,
5.1.17 Minimum and maximum actuator control signal
and sizes, as specified in Section 5.
pressure, kPa (psi) (benchset of the actuator),
4.1.1 Material Grades (Applicable to Pressure Containing
5.1.18 When manual override feature is required, its
Parts Only):
location—top or side-mounted (see 6.14.3),
4.1.1.1 Grade A—Alloy Steel—Material Group 1.9 of
5.1.19 Valvefail-positionrequireduponlossofairsupplyto
1 1 1
ASME B16.34 (1 Cr- ⁄2 Mo, or 1- ⁄4 Cr- ⁄2 Mo).
the actuator (see 6.14.4)
4.1.1.2 Grade B—Carbon Steel—Material Group 1.1 of
5.1.20 Instrumentation requirements (see 6.15),
ASME B16.34.
5.1.21 Supplementaryrequirements,ifany(seeSupplemen-
4.1.1.3 Grace C—Corrosion-Resistance Stainless Steel—
tary Requirements, S1, S2, or S3).
Material Group 2.2 of ASME B16.34 (18 Cr-8 Ni alloy).
4.1.1.4 Grade D—As specified in the ordering information
6. Valve Construction
(see Section 5.)
4.2 Pressure Ratings—Valve shall have pressure ratings
6.1 Valves shall incorporate the design features specified
selectedfromthoselistedinTable1andspecifiedinSection5.
below:
4.3 Types:
6.1.1 General Requirements:
4.3.1 Type 1—Two-way valve, in-line (two end connec-
6.1.1.1 Design shall permit adjustment without requiring
tions).
removal of the valve body from the line.
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 Type 4—Three-way valve, diverging service (three
parts shall be compatible with the line media specified in
end 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 FCI70-2 and specified in Section 5.
times the 38°C (100°F) pressure rating(s) of the valve without
4.5 Flow Characteristics—Theinherentflowcharacteristics
damage.
of the valve shall be specified as quick-opening, linear-
opening, equal-percentage opening, or as specified in Section 6.4 Joints—The bonnet and bottom cover/flange shall be
attached to the body using bolted flanges, a threaded connec-
5. (Additional guidance on valve flow characteristics can be
found in ISA Handbook of Control Valves). tion, or a threaded-union connection.
4.6 End Connections—Valve shall have end connections
6.5 Valve Springs—Any spring incorporated in the control
selectedfromthoselistedinTable1andspecifiedinSection5.
valve shall not be compressed solid during operation. Spring
4.7 Sizes—Valve size shall be as specified in Section 5.
ends shall be squared and ground.
6.6 Threads—Threads shall be as specified inASME B1.1.
5. Ordering Information
Where necessary, provisions shall be incorporated to prevent
the accidental loosening of threaded parts. The design shall be
5.1 Ordering documentation for valves under this specifica-
tion shall include the following information, as required, to suchthatstandardwrenchescanbeusedonallexternalbolting.
Lock-wire shall not be used. Any exposed threads shall be
describe the equipment adequately:
5.1.1 ASTM designation and year of issue, protected by plastic caps for shipping.
5.1.2 Material grade (see 4.1 and Table 1),
6.7 Interchangeability—The control valve, including all
5.1.3 Pressure rating (see 4.2),
associatedpieceparts,shallhavepartnumberidentityandshall
5.1.4 Pressure drop (Dp), kPa (psi),
be replaceable from stock by the manufacturer on a nonselec-
5.1.5 Typ
...