ASTM F1985-99
(Specification)Standard Specification for Pneumatic-Operated, Globe-Syle, Control Valves
Standard Specification for Pneumatic-Operated, Globe-Syle, Control Valves
SCOPE
1.1 This specification covers the design, construction, testing, and operating requirements for pneumatic-operated, globe-style, control valves complete with actuators for various fluid systems (steam, gas, and liquid applications). The control valves with actuators may be procured under this specification complete with all associated pneumatic instrumentation necessary for the valve to function in the system application; however, complete and detailed requirements for air instrumentation are beyond the scope of this specification and thus are not included here. This specification is not intended to cover quarter-turn or multi-turn stem valves.
1.2 The values stated in metric units (SI) are to be regarded as the standard. The values given in parenthesis (inch/pound) are provided for information purposes.
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An American National Standard
Designation: F 1985 – 99
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 (e) 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 metric units (SI) are to be regarded
nally Excited)
as standard. The values given in parenthesis (inch/pound) are
MS-16142 Boss Gasket-Seal Straight Thread Tube Fitting,
provided for information purposes.
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 Forged Steel Fittings, Socket-Welding and
WOG, NPS, For UT Inspections
Threaded
2.7 ISA Standard:
B16.25 Buttwelding Ends
ISA-S75.05 Standard for Control Valve Terminology
B16.24 BronzePipeFlangesandFlangedfittings,Class150
and 300
3. Terminology
B16.34 Valves-FlangedandButtweldingEndSteel,Nickel
3.1 Definitions of Terms Specific to This Standard:
Alloy, and Other Special Allows
2.3 Manufacturers Standardization Society of the Valve and
Fitting Industry:
AvailablefromManufacturers’StandardizationSocietyoftheValveandFitting
Industry, 1815 N. Fort Myer Dr., Arlington, Va 22209.
1 4
This specification is under the jurisdiction of ASTM committee F25 on Ships Available from Fluid Controls Institute, 1300 Sumner Ave., Cleveland, OH
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on 44115.
Machinery and Piping Systems. Available from the Superintendent of Documents, U.S. Government Printing
Current edition approved July 10, 1999. Published September 1999. Office, Washington, DC 20036.
2 6
Available from American Society of Mechanical Engineers, 345 E. 47th St., Available from International Society for Measurement and Control, 67 Alex-
ander Dr., PO Box 12277, Research Triangle Park, NC 27709.
New York, NY 10017.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1985–99
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
3.1.2 bonnet—the upper portion of the valve body subas- End Connection
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
be varied, upon reversal of direction, without an observable
Socket-welded ASME B16.34 ASME B16.11
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
characteristicofacontrolvalveprovidesachangeinflow,with Flanged ASME B16.34 ASME B16.5
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
V
(cast iron valves only) Class 125, 250
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 B16.24 ASME B16.24
(bronze) Class 150, and 300
defined as the number of litres per seconds (gallons/min) of
16°C (60°F) water that will flow through the valve with a 6.9
Flanged-navy MIL-F-20042 MIL-F-20042
(bronze) Class 150, 250, 400
kPa (1 psi) pressure drop (Dp) across the valve.
3.1.6 globe-style valve—a basic control valve type that gets
Threaded ASME B16.34 ASME B1.20.1
(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
3.1.7 hydrostatic shell test pressure—the hydrostatic test Union-end , MIL-F-1183 MIL-F-1183
silver-brazed (O-ring type) (O-ring type)
pressure that the valve body is required to withstand without
2 2
400 lb/in. 400 lb/in.
damage or leakage. Valve operation is not required during
A
Union-end, 803-1385946 803-1385946
application of this test pressure, but the valve shall meet all
2 2
silver-brazed 1500 lb/in. 1500 lb/in.
performancerequirementsafterthepressurehasbeenremoved.
A
3.1.8 hysteresis—the maximum difference in output value Union-end, 803-1385943 803-1385943
2 2
silver-brazed 3000 lb/in. 3000 lb/in.
for any single input value during a calibration cycle, excluding
errors as a result of dead band. A
Union-end, 803-1385884 803-1385884
2 2
butt/socket weld 6000 lb/in. 6000 lb/in.
3.1.9 instrumentation—the term instrumentation, when
used in this specification, refers to any instrumentation, that is,
Other, as specified as specified as specified
pilot controllers, transmitters, relays, selectors, positioners,
A
For union inlet and outlet end connections, only the pertinent dimensions listed
instrumentairreducingvalves,andstrainers/filtersrequiredfor intheapplicabledocuments(MilitarySpecificationorNAVSEArequirements)shall
apply.UnlessotherwisespecifiedintheorderingdataSection5,thetailpiecesand
operation of the control valve in the system.
the union-nuts shall not be furnished—only the thread-pieces shall be furnished. If
3.1.10 internal trim—internal parts of the control valve,
tailpieces and union-nuts are required, their materials of construction shall be in
accordance with the applicable documents listed above and shall be specified in
including seat rings, plug, stem, guide bushings, cage, pistons,
the ordering data Section 5.
and so forth.
3.1.11 linear-opening—a linear-opening flow characteristic
establish the maximum allowable working (service) pressures
of a control valve provides a change in flow that is linearly
of a component (valve, end connections, and so forth) at
proportional with valve lift.
various temperatures.
3.1.12 linearity—the measure of how close a plot of the
3.1.16 quick change cage trim—a gasket or an O-ring
valvestemtravel(inresponsetoanincreasingandadecreasing
sealedseatringheldinpositionbyacage,whichmaybeeither
input signal) conforms to a straight line. Linearity is normally
separate from or integral with the seat ring.The cage is held in
expressed as the ratio (in percentage) of the maximum devia-
position by either the bonnet or bottom flange. This design
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.
F1985–99
3.1.19 travel indicator—the moving pointer mechanically 5.1.8 End connections (see 4.6),
attached to the valve stem and working in conjunction with a 5.1.9 Size, inlet, and outlet (see 4.7),
fixed indicator scale attached to the yoke. 5.1.10 Rangeability (see 7.2),
3.1.20 three-way valve—a three-way valve has three end 5.1.11 Line medium (see 6.2),
connections configured for converging or diverging flow. 5.1.12 Operating pressures of the line media (minimum,
3.1.21 valve body subassembly—the combination of valve normal, and maximum) (see 6.16),
body, bonnet, end connections, and internal trim. 5.1.13 Inlet temperature of the line media (minimum, nor-
3.1.22 yoke—theintermediatepiecebetweenthevalvebon- mal, and maximum) (see 6.16),
net and the actuator. 5.1.14 Flow rate required (minimum, normal, and maxi-
3.2 Additional guidance on the control valve terminology mum) (see 7.1),
can be found in ISA-S75.05. 5.1.15 Replaceable seat ring requirement (see 6.13),
5.1.16 Minimum available air supply pressure to the actua-
4. Classification
tor (see 6.16),
4.1 Valves shall be of the following material grades, pres-
5.1.17 Minimum and maximum actuator control signal
sure ratings, types, seat leakage classes, flow characteristics,
pressure, kPa (psi) (benchset of the actuator),
and sizes, as specified in Section 5. 5.1.18 When manual override feature is required, its
4.1.1 Material Grades (Applicable to Pressure Containing
location—top or side-mounted (see 6.14.3),
Parts Only): 5.1.19 Valvefail-positionrequireduponlossofairsupplyto
4.1.1.1 Grade A—Alloy Steel—Material Group 1.9 of
the actuator (see 6.14.4)
1 1 1
ASME B16.34 (1 Cr- ⁄2 Mo, or 1- ⁄4 Cr- ⁄2 Mo). 5.1.20 Instrumentation requirements (see 6.15),
4.1.1.2 Grade B—Carbon Steel—Material Group 1.1 of
5.1.21 Supplementaryrequirements,ifany(seeSupplemen-
ASME B16.34. tary Requirements, S1, S2, or S3).
4.1.1.3 Grace C—Corrosion-Resistance Stainless Steel—
6. Valve Construction
Material Group 2.2 of ASME B16.34 (18 Cr-8 Ni alloy).
6.1 Valves shall incorporate the design features specified
4.1.1.4 Grade D—As specified in the ordering information
(see Section 5.) below:
6.1.1 General Requirements:
4.2 Pressure Ratings—Valve shall have pressure ratings
6.1.1.1 Design shall permit adjustment without requiring
selectedfromthoselistedinTable1andspecifiedinSection5.
removal of the valve body from the line.
4.3 Types:
6.2 Materials of Construction—Materials for pressure-
4.3.1 Type 1—Two-way valve, in-line (two end connec-
containing parts shall be in accordance with the applicable
tions).
documents listed in Table 1 (see 4.1). Materials for internal
4.3.2 Type 2—Two-wayvalve,angle(twoendconnections).
parts shall be compatible with the line media specified in
4.3.3 Type 3—Three-way valve, converging service (three
Section 5.
end connections—two inlet and one outlet end connections).
6.3 Pressure Envelope—Thecontrolvalveshallbedesigned
4.3.4 Type 4—Three-way valve, diverging service (three
to pass a hydrostatic shell test at pressure(s) of at least 1.5
end connections—one inlet and two outlet end connections).
times the 38°C (100°F) pressure rating(s) of the valve without
4.4 Seat Leakage Classes (Maximum Allowable Seat
damage.
Leakage)—Seat leakage class shall be selected from those
6.4 Joints—The bonnet and bottom cover/flange shall be
listed in FCI 70-2 and specified in Section 5.
attached to the body using bolted flanges, a threaded connec-
4.5 Flow Characteristics—Theinherentflowcharacteristics
tion, or a threaded-union connection.
of the valve shall be specified as quick-opening, linear-
6.5 Valve Springs—Any spring incorporated in the control
opening, equal-percentage opening, or as specified in Section
5. (Additional guidance on valve flow characteristics can be valve shall not be compressed solid during operation. Spring
ends shall be squared and ground.
found in ISA Handbook of Control Valves).
4.6 End Connections—Valve shall have end connections 6.6 Threads—Threads shall be as specified inASME B1.1.
Where necessary, provisions shall be incorporated to prevent
selectedfromthoselistedinTable1andspecifiedinSection5.
the accidental loosening of threaded parts. The design shall be
4.7 Sizes—Valve size shall be as specified in Section 5.
suchthatstandardwrenchescanbeusedonallexternalbolting.
5. Ordering Information
Lock-wire shall not be used. Any exposed threads shall be
5.1 Ordering documentation for valves under this specifica- protected by plastic caps for shipping.
tion shall include the following information, as required, to 6.7 Interchangeability—The control valve, including all
describe the equipment adequately: associatedpieceparts,shallhavepartnumberidentityandshall
5.1.1 ASTM designation and year of issue, be replaceable from stock by the manufacturer on a nonselec-
5.1.2 Material grade (see 4.1 and T
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