ASTM F1795-00(2006)
(Specification)Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
ABSTRACT
This specification covers the design, construction, testing, and operating requirements for self-contained pressure-reducing valves for air or nitrogen systems. Pressure-reducing valves shall be either: type I - inlet outlet end connections of the same pressure rating or type II - outlet end connection pressure rating lower than the inlet end connection rating. Valves shall incorporate the design features specified. Pressure-reducing valves shall meet the performance requirements prescribed. Hydrostatic shell test, seal tightness test, and external leakage test shall be performed to meet the requirements prescribed.
SCOPE
1.1 This specification covers the design, construction, testing and operating requirements for self-contained pressure-reducing valves for air or nitrogen systems.
1.2 The values stated in this specification in inch-pounds units are to be regarded as the standard. The SI equivalent shown in parenthesis are provided for information only.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation:F1795 −00(Reapproved 2006) An American National Standard
Standard Specification for
Pressure-Reducing Valves for Air or Nitrogen Systems
This standard is issued under the fixed designation F1795; 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.
1. Scope 2.4 Government Drawings:
Naval Sea Systems Command (NAVSEA):
1.1 This specification covers the design, construction,
NAVSEA 803-1385884 Unions, Fittings and Adapters Butt
testing,andoperatingrequirementsforself-containedpressure-
and Socket Welding 6000 PSI, WOG, NPS
reducing valves for air or nitrogen systems.
NAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI,
1.2 The values stated in this specification in inch-pounds
WOG, NPS, for UT Inspection
units are to be regarded as the standard. The SI equivalent
NAVSEA 803-1385946 Unions, Bronze Silver Brazing,
shown in parentheses are provided for information only.
WOG for UT Inspection
2. Referenced Documents
3. Terminology
2.1 ASTM Standards:
3.1 Definitions:
F992 Specification for Valve Label Plates
3.1.1 accuracy of regulation—the amount by which the
F1685 Specification for Pressure-Reducing Manifolds for
downstream pressure may vary when the pressure-reducing
Air or Nitrogen Systems
valve is set at any pressure within the required set pressure
2.2 American National Standards Institute (ANSI):
range and is subjected to any combination of inlet pressure,
B1.1 United Screw Threads (UN and UNR Thread Form)
flow demand, and ambient temperature variations within the
B1.20.1 Pipe Threads, General Purpose (Inch)
specified limits.
B16.11 Forged Steel Fittings, Socket-Welding and
3.1.2 bubble-sight—no visible leakage over a 3-min period
Threaded
usingeitherwatersubmersionortheapplicationofbubblefluid
B16.25 Buttwelding Ends
for detection.
B16.34 Valves—Flanged, Threaded, and Welded End
3.1.3 external leakage—leakage from the pressure-reducing
2.3 Military Standards and Specifications:
valve which escapes to atmosphere.
MIL-STD-167-1 Mechanical Vibrations of Shipboard
3.1.4 fail-open flow capacity—the ability of the pressure-
Equipment (Type I—Environmental and Type II—
reducing valve to pass flow under any given set of pressure
Internally Excited)
conditions when, as a result of mechanical failure, it has
MIL-STD-740-1 Airborne Sound Measurements andAccep-
assumed a position of least resistance to flow.
tance Criteria of Shipboard Equipment
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
3.1.5 flow capacity—the ability of the pressure-reducing
Machinery, Equipment and Systems, Requirements for
valve to pass flow under any given set of pressure conditions.
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,
3.1.6 flow rate demand—the amount of flow demanded by
General Specifications for
the system at any given time downstream of the pressure-
reducing valve.
3.1.7 flow rate demand range—the range over which the
This specification is under the jurisdiction of ASTM Committee F25 on Ships
flow demand can vary.
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
3.1.8 hydrostatic shell test pressure(s)—The hydrostatic test
Current edition approved May 1, 2006. Published May 2006. Originally
pressures that the inlet and outlet of the pressure-reducing
approved in 1997. Last previous edition approved in 2000 as F1795 – 00. DOI:
10.1520/F1795-00R06. valve is required to withstand without damage. Pressure-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
reducing valve operation is not required during application of
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
shell test pressure, but the pressure-reducing valve must meet
Standards volume information, refer to the standard’s Document Summary page on
all performance requirements after the shell test pressure has
the ASTM website.
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
been removed.
4th Floor, New York, NY 10036.
3.1.9 inlet operating pressure range—the range over which
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111–5094, Attn: NPODS. the inlet pressure supplied to the pressure-reducing valve can
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1795−00 (2006)
vary under any operational conditions which the pressure- that the setting is made when there is no flow demand on the
reducing valve can be subjected to in service. pressure-reducing valve (“lock-up” condition), and the
pressure-reducingvalveisatsurroundingambienttemperature.
3.1.10 operating pressure(s)—the pressures within the
pressure-reducing valve during service. 3.1.17 set pressure range—the range of set pressures (set
pressure limits) over which the pressure-reducing valve can be
3.1.11 pressure ratings—the pressure ratings of the
adjusted while meeting the performance requirements speci-
pressure-reducing valve shall be as defined in the documents
fied.
listed in Table 1. The pressure ratings (also called pressure-
temperatureratings)establishthemaximumallowableworking 3.1.18 soft-seating insert—the insert, incorporated in either
(service) pressures of a component (valve, end connections, the poppet or the seat of the pressure-reducing valve, which
and so forth) at various temperatures. For a pressure-reducing ensures bubble-tight seat tightness under all operating condi-
valve, the pressure ratings may not be identical for the valve tions.
inlet and outlet.
3.1.19 valvepoppet—thepartofthepressure-reducingvalve
3.1.12 pressure-reducing valve—a component which ac- trim which established a rate of flow by moving toward or
complishes automatic regulation of the downstream pressure. away from the valve seat.
In this component, the upstream pressure is reduced to the
4. Classification
desired downstream pressure.
4.1 Pressure-reducingvalvesshallbeofthefollowingtypes,
3.1.13 pressure reversal—a condition in which pressure
sizes, pressure ratings, and end connections, as specified in
exists at the outlet of a pressure-reducing valve when the
Section 5.
loading element is deactivated (set spring adjustment backed
4.1.1 Types—Pressure-reducingvalvesshallbeeitherTypeI
off fully or dome charge vented off completely) and inlet
(inlet outlet end connections of the same pressure rating) or
pressure is vented off.
Type II (outlet end connection pressure rating lower than the
3.1.14 seat-tightness—the ability of the pressure-reducing
inlet end connection rating) and specified in Section 5.
valve to prevent leakage from the valve inlet to the valve
4.1.2 Sizes—Pressure-reducing valve sizes shall be ⁄8 NPS
outlet.
1 3 1
(10.2 mm), ⁄4 NPS (13.5 mm), ⁄8 NPS (17.2 mm), ⁄2 NPS
3.1.15 self-contained pressure-reducing valve— a pressure- 3 1
(21.3 mm), ⁄4 NPS (26.9 mm), 1 NPS (33.7 mm), 1 ⁄4 NPS
reducingvalvethatdoesnotuseanexternalpowersource,such 1
(42.4 mm), 1 ⁄2 NPS (48.3 mm), and 2 NPS (60.3 mm).
as compressed air, electricity, or hydraulic fluid for operation,
4.1.3 Pressure Ratings— Pressure-reducing valves shall
but instead uses the line fluid for operation.
have pressure rating(s) selected (see 3.1) from Table 1. The
pressure rating(s) selected shall be specified in Section 5.
3.1.16 set pressure—the outlet pressure delivered by the
pressure-reducing valve at the time the pressure setting is 4.1.4 End Connections— Pressure-reducing valves shall
have end connections selected from those listed in Table 1 and
made. For the purposes of this specification, it will be assumed
specified in Section 5.
5. Ordering Information
TABLE 1 Pressure Ratings for Pressure-Reducing Valve
Applicable Documents for
5.1 Ordering documentation for pressure-reducing valves
Type of End
Pressure Rating Dimensional Details of End
Connection under this specification shall include the following information
Connections
as required to describe the equipment adequately.
Butt-welded ANSI B16.34 Class ANSI B16.25
5.1.1 ASTM designation and year of issue,
150, 300, 400,
600, 900, 1500,
5.1.2 Valve type (see 4.1.1),
2500, or 4500
5.1.3 Valve inlet and outlet sizes (see 4.1.2),
Socket-welded ANSI B16.34 Class ANSI B16.11
5.1.4 Pressure rating(s) (see 4.1.3),
150, 300, 400,
600, 900, 1500,
5.1.5 Type of end connections (see 4.1.4),
2500, or 4500
5.1.6 Inlet operating pressure range.
Threaded (tapered ANSI B16.34 Class ANSI B1.20.1 and ANSI
pipe thread) 150, 300, 400, B16.11 5.1.7 Set pressure and set pressure range, if other than
600, 900,
specified (see 7.1.3).
1500, or 2500
A 5.1.8 Flow rate demand range (see 7.1.1, S1.1.2).
Union end, MIL-F-1183 (O-ring MIL-F-1183 (O-ring type)
2 2
silver-brazed
type) 400 lb/in. 400 lb/in. (2.758 MPa) 5.1.9 Accuracy of regulation required, if set pressure is
(2.758 MPa)
below 10 psig (see 7.1.2).
A
Union end, 803-1385946 1500 803-1385946 1500
2 2 5.1.10 Tamper-proof set-point adjustment, if required (see
silver-brazed
lb/in. (10.342 MPa) lb/in. (10.342 MPa)
A
Union end, 803-1385943 3000 803-1385943 3000
6.1.9),
2 2
silver-brazed
lb/in. (20.64 MPa) lb/in. (20.64 MPa)
5.1.11 Supplementary requirements, if any (S1 through S4).
A
Union end, 803-1385884 6000 803-1385884 6000
2 2
butt/socket weld 5.1.12 Maximum vibration frequency and displacement am-
lb/in. (41.369 MPa) lb/in. (41.369 MPa)
Other, as specified as specified as specified
plitude, if other than specified (see S1.1.4).
A
For union inlet and outlet end connections, only the pertinent dimensions listed
6. Valve Construction
intheapplicabledocuments(MilitarySpecificationorNAVSEArequirements)shall
apply. The valve shall be supplied with the thread pieces only, without the tall
6.1 Valves shall incorporate the design features specified in
pieces and union nuts.
6.1.1-6.1.19.
F1795−00 (2006)
6.1.1 General Requirements—Pressure-reducing valves two valves installed in series, with a bleed-off valve in-
shall be self-contained, requiring no external power source for between. If these valves are metal seated, they shall not seat
operation. The pressure-reducing valve shall be capable of
directly into the structure of the dome so that damage or wear
meeting all requirements of this specification and provide
to the seating surfaces would not require repair or replacement
extendedreliableoperationwhenprotectedbya5-µmnominal/
of the dome. Only a single dome penetration is allowed. The
18-µm absolute filter installed upstream and when subjected to
valvesshallbeoperablebyastandard-sizehexwrenchorother
conditions specified in Section 5.
suitable means. There shall be no external leakage past the
6.1.2 Materials of Construction—Material requirements for
threads during dome bleeding. Flow from the bleed-off valve
the pressure-reducing valve shall be as follows: The pressure
shall be ported in such a way that it does not impinge directly
containing envelope (body, gas dome, or spring housing) shall
on the person making the adjustment, cause excessive noise, or
be 300 series corrosion-resistant steel (304, 304L, 316, or
potentially lead to ice formation within the dome loading
316L). Internal parts including springs, poppets, seal rings, and
circuit.
retainers shall be 300 series corrosion-resistant steel, nickel-
6.1.11 Threads—Threads shall be as specified in ANSI
aluminum bronze, nickel-copper (70–30), or bronze. Other
B1.1. Where necessary, provisions shall be incorporated to
materials for both the pressure-containing envelope and inter-
prevent the accidental loosening of threaded parts. The design
nal parts may be selected to assure compatibility with the line
shallbesuchthatstandardwrenchescanbeusedonallexternal
medium, weldability, and to provide corrosion resistance
bolting.Lock-wireshallnotbeused.Anyexposedthreadsshall
without requiring painting, coating, or plating. Materials for
be protected by plastic caps for shipping.
contacting parts shall be selected to minimize electrolytic
6.1.12 Accessability— All internal parts of the pressure-
corrosion and galling.
reducing valve shall be accessible for adjustment or service,
6.1.3 PressureEnvelope—Thepressure-reducingvalveshall
without removing the pressure-reducing valve from the line.
be designed to pass a hydrostatic shell test at pressure(s) of at
6.1.13 Interchangeability—The pressure-reducing valve in-
least 1.5 times the 100°F (38°C) pressure rating(s) of the valve
cluding all associated piece parts, shall have part number
without damage.
identity, and shall be replaceable from stock or the manufac-
6.1.4 Port Configuration—The pressure-reducing valve
turer on a nonselective and random basis. Parts having the
shall have in-line inlet and outlet ports.
samemanufacturer’spartnumbershallbedirectlyinterchange-
6.1.5 Pressure Lines— All pressure lines in the pressure-
able with each other with respect to installation (physical) and
reducing valve shall be internally ported.
performance (function). Physically interchangeable assem-
6.1.6 Soft-Seating Insert—A field replaceable soft-seating
blies, components, and parts are those that are capable of being
insert shall be incorporated in the pressure-reducing valve.
readily installed, removed, or replaced without alternation,
Soft-seating inserts shall be protected from direct flow im-
misalignmentordamagetopartsbeinginstalledortoadjoining
pingement, excessive loading and extrusion, or any other effect
parts. Fabrication operations such as cutting, filing, drilling,
jeopardizingtheirusefullife.Soft-seatinginsertsshallbeofthe
reaming, hammering, bending, prying, or forcing shall not be
simplest practical configuration to facilitate emergency re-
required.
placement manufacture where necessary.
6.1.7 Joints—The bonnet or spring housing and bottom cap
6.1.14 Nonmetallic Element Interchangeability
shall be attached to the body by bolting, a threaded connection, —Nonmetallic elements, including but not limited to, soft-
or a threaded union connection.
seating inserts, cushions, and O-rings, shall be treated as
6.1.8 Springs—Any spring incorporated in the pressure- separately identified and readily replaceable parts.
reducing valve shall not be compressed solid during operation.
6.1.15 Maintainability— Maintenance shall require stan-
Spring ends shall be squared and ground. Engagement or
dard tools to the maximum extent possible. Any special tools
disengagement of parts against spring compression shall not be
required for maintenance shall be identified, and shall be
permitted.
supplied as part of the valve
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