ASTM F1685-00(2019)

Standard Specification for Pressure-Reducing Manifolds for Air or Nitrogen Systems

ABSTRACT
This specification covers the design, construction, testing and operating requirements for pressure-reducing manifolds for air or nitrogen systems, which constitute the combination of all components and piping between, and including, the inlet and outlet ports. The manufactured manifolds shall perform satisfactorily to the following procedures: visual examination; hydrostatic shell test; relief-valve lift test; seat tightness test; and external leakage test.
SCOPE
1.1 This specification covers the design, construction, testing and operating requirements for pressure-reducing manifolds for air or nitrogen systems, referred to herein also as manifolds. The term manifold constitutes the combination of all components and piping between, and including, the inlet and outlet ports (see Fig. 1 and Fig. 2).  
FIG. 1 Manifold Configuration  
FIG. 2 Manifold Configuration  
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.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2019
• ICS: 23.060.40 - Pressure regulators
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Relations

• Replaces: ASTM F1685-00(2013) - Standard Specification for Pressure-Reducing Manifolds for Air or Nitrogen Systems
• Effective Date: 01-May-2019
• Refers: ASTM F1795-00(2013) - Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
• Effective Date: 01-May-2013
• Refers: ASTM F992-86(2011) - Standard Specification for Valve Label Plates
• Effective Date: 01-Apr-2011
• Refers: ASTM F1508-96(2010) - Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas and Liquid Services
• Effective Date: 01-May-2010
• Refers: ASTM F1795-00(2006) - Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
• Effective Date: 01-May-2006
• Refers: ASTM F992-86(2006) - Standard Specification for Valve Label Plates
• Effective Date: 01-Feb-2006
• Refers: ASTM F1508-96(2004) - Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas and Liquid Services
• Effective Date: 01-May-2004
• Refers: ASTM F1795-00 - Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
• Effective Date: 10-May-2000
• Refers: ASTM F1508-96 - Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas and Liquid Services
• Effective Date: 01-Jan-1996
• Refers: ASTM F992-86(2001) - Standard Specification for Valve Label Plates
• Effective Date: 27-Mar-1986
• Referred By: ASTM F1795-00(2019) - Standard Specification for Pressure-Reducing Valves for Air or Nitrogen Systems
• Effective Date: 01-May-2019

Overview

ASTM F1685-00(2019), titled Standard Specification for Pressure-Reducing Manifolds for Air or Nitrogen Systems, provides a comprehensive set of criteria for the design, construction, testing, and operational requirements for pressure-reducing manifolds. Issued by ASTM International, this standard ensures that all components and piping between, and including, the inlet and outlet ports of these manifolds meet performance, reliability, and safety guidelines, specifically for air and nitrogen system applications. These manifolds are essential for reliably controlling pressure in industrial and military environments.

Key Topics

• Design and Construction Requirements:
  Specifies materials, configuration, and mounting of the manifold. It mandates corrosion-resistant steels (such as SS304, 304L, 316, or 316L) for main blocks and components, promoting durability and corrosion resistance.

• Functional Elements:
  Manifolds must include inlet and outlet stop valves, pressure-reducing and relief valves, bleed valves, gauge isolation valve, bypass throttle valve, and all necessary interconnecting piping.

• Operating and Pressure Ratings:
  Pressure ratings for manifolds are categorized as 400, 1500, 3000, or 6000 psig, with corresponding end connection types and requirements for both inlet and outlet ports.

• Performance Requirements:
  Must meet strict flow capacity, accuracy of pressure regulation, seat tightness (bubble-tight closure in both directions), and external leakage standards, ensuring reliable performance under varied operational conditions.

• Testing Procedures:
  Each manufactured manifold undergoes visual examination, hydrostatic shell testing (1.5 times rated pressure), relief-valve lift tests, seat tightness, and external leakage tests.

• Quality Assurance & Marking:
  Manufacturers must maintain a quality system ensuring consistent conformity. Manifolds require durable identification markings including manufacturer info, ASTM designation, operating specifications, and model number.

Applications

The pressure-reducing manifolds described in ASTM F1685-00(2019) are widely used in:

• Industrial Air Systems:
  Essential for regulating distributed air pressure in pneumatic control, manufacturing, and automated processing systems.

• Nitrogen Systems:
  Used in laboratories, chemical processing, and inert gas applications where precise control and reliable operation are critical for equipment safety and system integrity.

• Marine and Military Applications:
  The standard references military and naval requirements, making these manifolds suitable for shipboard and defense-related installations, where robust performance under vibration, shock, and environmental stress is necessary.

• Quality-Controlled Installations:
  Facilities requiring bubble-tight shutoff, consistent downstream pressure, and reliable overpressure protection rely on these systems for process safety.

Related Standards

ASTM F1685-00(2019) references and works alongside several key standards to ensure compatibility and comprehensive safety:

• ASTM F992: Specification for valve label plates, ensuring clear equipment labeling.
• ASTM F1508: Specifies angle style, pressure relief valves for steam, gas, and liquid.
• ASTM F1795: Pressure-reducing valves for air or nitrogen systems, complementing manifold specifications.
• ASME B1.1: Unified inch screw threads standard for mechanical compatibility.
• MIL-STD-167-1: Military standard for shipboard mechanical vibration.
• MIL-S-901, MIL-F-1183: Shock testing and pipe fitting standards for high-impact and marine applications.

Practical Value

Implementing ASTM F1685-00(2019) ensures pressure-reducing manifolds for air and nitrogen systems are safe, maintainable, and consistent with international best practices. Facilities and engineers benefit from:

• Enhanced system reliability and safety due to rigorous construction and testing criteria.
• Compatibility across various industrial, laboratory, and defense applications.
• Assurance of product interchangeability, consistent maintenance, and simplified installation.

Keywords: pressure-reducing manifold, air system, nitrogen system, pressure control, ASTM standard, industrial gas manifold, hydrostatic test, bubble-tight, pressure regulation, valve assembly, corrosion-resistant steel.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1685 −00 (Reapproved 2019) An American National Standard
Standard Specification for
Pressure-Reducing Manifolds for Air or Nitrogen Systems
This standard is issued under the fixed designation F1685; 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 Military Standards and Specifications:
MIL-STD-167-1 Mechanical Vibrations of Shipboard
1.1 This specification covers the design, construction, test-
Equipment (Type I—Environmental and Type II— Inter-
ing and operating requirements for pressure-reducing mani-
nally Excited)
folds for air or nitrogen systems, referred to herein also as
MIL-STD-740AirborneandStructureborneNoiseMeasure-
manifolds. The term manifold constitutes the combination of
ments and Acceptance Criteria of Shipboard Equipment
all components and piping between, and including, the inlet
MS16142Boss, Gasket Seal Straight Thread Tube Fitting,
and outlet ports (see Fig. 1 and Fig. 2).
Standard Dimensions for
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
MIL-S-901Shock Tests, H.I. (High-Impact); Shipboard
as standard. The values given in parentheses are mathematical
Machinery, Equipment and Systems, Requirements for
conversions to SI units that are provided for information only
MIL-F-1183Fittings, Pipe, Cast Bronze, Silver-Brazing,
and are not considered standard.
General Specification for
1.3 This international standard was developed in accor-
2.4 Government Drawings:
dance with internationally recognized principles on standard-
Naval Sea Systems Command (NAVSEA):
ization established in the Decision on Principles for the
NAVSEA803-1385884Unions, Fittings and Adapters Butt
Development of International Standards, Guides and Recom-
and Socket Welding 6000 PSI, WOG and OXY (IPS)
mendations issued by the World Trade Organization Technical
NAVSEA803-1385943Unions, Silver Brazing 3000 PSI,
Barriers to Trade (TBT) Committee.
WOG, IPS, for UT Inspection
NAVSEA 803-1385946 Unions, Bronze, Silver Brazing,
2. Referenced Documents
WOG for UT Inspection, 1500 PSI, WOG
2.1 ASTM Standards:
F992Specification for Valve Label Plates 3. Terminology
F1508Specification forAngle Style, Pressure Relief Valves
3.1 Definitions:
for Steam, Gas, and Liquid Services
3.1.1 accuracy of regulation, n—the amount by which the
F1795Specification for Pressure-ReducingValves forAir or
downstreampressuremayvarywhenthemanifoldissetatany
Nitrogen Systems
pressurewithintherequiredsetpressurerangeandissubjected
2.2 ASME Standard:
to any combination of inlet pressure, flow demand, and
B1.1Unified Inch Screw Threads
ambient temperature variations within the specified limits.
3.1.2 bubble-tight, n—no visible leakage over a 5-min
This specification is under the jurisdiction ofASTM Committee F25 on Ships
period using either water submersion or the application of
and Marine Technology and is under the direct responsibility of Subcommittee
bubble fluid for detection.
F25.11 on Machinery and Piping Systems.
Current edition approved May 1, 2019. Published June 2019. Originally
3.1.3 external leakage, n—leakagefromthemanifoldwhich
approved in 1996. Last previous edition approved in 2013 as F1685–00 (2013).
escapes to atmosphere.
DOI: 10.1520/F1685-00R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.1.4 flow rate demand, n—theamountofflowdemandedat
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
any given time by the system downstream of the manifold.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http:// Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
www.asme.org. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1685 − 00 (2019)
FIG. 1 Manifold Configuration
FIG. 2 Manifold Configuration
3.1.5 flow rate demand range, n—the range over which the including the seats of the outlet stop valve and bypass throttle
flow demand can vary. valve. The outlet pressure rating is applicable from the outlet
side of the seats of the outlet stop valve to the manifold outlet
3.1.6 hydrostatic shell test pressures, n—thehydrostatictest
and the bypass throttle valve to the manifold outlet.
pressures that the inlet and outlet sections of the manifold are
required to withstand without damage. Manifold operation is 3.1.10 manual valves, n—these are all the manually oper-
not required during application of shell test pressure, but the ated valves in the manifold which include handwheel-operated
manifold must meet all performance requirements after the valves and wrench-operated valves. The handwheel-operated
shell test pressure has been removed. valves are the inlet and outlet stop valves, and the bypass
throttle valve. The wrench-operated valves are the upstream
3.1.7 inlet operating pressure range, n—the range over
anddownstreambleedvalvesandthegageisolationvalve.The
which the inlet pressure supplied to the manifold can vary
requirements for any manually operated valves installed in the
under any operational conditions which the manifold can be
pressure-reducing valve are covered under 6.5.1.
subjected to in service.
3.1.11 maximum flow rate demand, n—the maximum
3.1.8 internal leakage, n—leakage from higher pressure to
amount of flow demanded of the manifold by the downstream
lower pressure portions of the manifold and which does not
system.
escape to atmosphere.
3.1.12 maximum inlet operating pressure, n—the highest
3.1.9 manifold rated pressures, n—the inlet and outlet
pressure supplied to the inlet of the manifold in service.
pressure ratings of the manifold. These rated pressures are
selected from the applicable pressure ratings (see 4.2) and 3.1.13 maximum outlet operating pressure, n—the highest
specified in the ordering information (see Section 5). The inlet pressureatthemanifoldoutletinservice.Thisisestablishedby
pressure rating is applicable from the manifold inlet up to and the accumulation pressure of the pressure-relief valve.
F1685 − 00 (2019)
TABLE 1 Manifold Inlet and Outlet End Connections
3.1.14 maximum set pressure, n—the highest set pressure at
which the manifold can meet the performance requirements Type of End Connection Pressure Rating, Applicable
lb/in (MPa) Documents
specified.
A
Union, silver-brazed 400 (2.8) MIL-F-1183 (O-ring type)
3.1.15 minimum flow rate demand, n—the minimum flow A
Union, silver-brazed 1500 (10.3) 803-1385946
A
Union, silver-brazed 3000 (20.5) 803-1385943
rate demanded of the manifold by the downstream system.
A
Union, butt/socket 6000 (41.4) 803-1385884
3.1.16 minimum inlet operating pressure, n—the lowest weld
As specified As specified As specified
pressure supplied to the inlet of the manifold in service.
A
Only the pertinent dimensions listed in the applicable documents applicable to
3.1.17 minimum outlet operating pressure, n—the lowest
the straight thread portion of the thread piece shall apply. Thread pieces shall be
pressureatthemanifoldoutletinservice.Thisisestablishedby secured to the manifold inlet and outlet blocks using straight threads and a O-ring
seal design. For the manifold inlet and outlet connections, unless otherwise
the accuracy of regulation of the pressure-reducing valve.
specified in Section 5 the tail pieces and the union nuts shall not be furnished—
onlythethreadpiecesshallbefurnished.Iftailpiecesandunionnutsarerequired,
3.1.18 minimum set pressure, n—the lowest set pressure at
their materials of construction shall be in accordance with the applicable docu-
which the manifold can meet the performance requirements
ments listed above and shall be specified in Section 5.
specified.
3.1.19 operating pressures, n—the pressures within the
manifold during service.
5.1.2 Size and type of inlet end connection (see 4.3 and
3.1.20 pressure-reducing valve, n—the component of the
6.4.2),
manifold which accomplishes automatic regulation of the
5.1.3 Size and type of outlet end connection (see 4.3 and
downstreampressure.Inthiscomponent,theupstreampressure
6.4.2),
is reduced to the desired downstream pressure.
5.1.4 Size and type of end connections for pressure-
3.1.21 pressure-relief valve, n—the component of the mani-
reducing valve and pressure-relief valve,
fold which protects the manifold and downstream systems
5.1.5 If tail pieces and union nuts are required (when
against downstream over pressurization.
required, their material of construction shall be in accordance
with Table 1),
3.1.22 set pressure, n—the outlet pressure delivered by the
5.1.6 Manifold configuration, inlet and outlet pressure rat-
manifold at the time the pressure setting is made. For the
ings (see 4.1 and 4.2),
purposes of this specification, it will be assumed that the
5.1.7 Manifold inlet operating pressure range,
setting is made when there is no flow demand on the manifold
5.1.8 Type of mounting required: bottom or back mounting
(“lock-up” condition), and the manifold is at surrounding
(see 6.4.3),
ambient temperature.
5.1.9 Set pressure and set pressure range, if other than
3.1.23 set pressure range, n—therangeofsetpressuresover
specified (see 7.3),
which the manifold can be adjusted while meeting the perfor-
5.1.10 Flow rate demand range (see 7.1, S1.1.6),
mance requirements specified.
5.1.11 Accuracy of regulation required, if other than
3.1.24 wide open capacity, n—the flow rate when a valve is
specified, or if set pressure is below 10 psig (see 7.2),
in a position which presents the least resistance to flow.
5.1.12 Relief valve set pressure and accumulation pressure
(if different from Specification F1508),
4. Classification
5.1.13 Ambient atmospheric conditions: temperature range,
chemical contaminants, if any,
4.1 Configuration—Manifolds shall be of the following
5.1.14 Quality of inlet air/nitrogen gas: temperature range,
configurations and specified in the ordering information (see
moisture content, oil/lubricant contaminants, if any,
5.1).
5.1.15 Special tools required (see 6.7),
Configuration 1-1 One reducer, one relief (see Fig. 1).
5.1.16 Tamper-proof lead seal if required (see Specification
Configuration 2-1 Two reducers, one relief (see Fig. 2).
F1795, Section 5),
4.2 Pressure Ratings—Manifolds shall have inlet-rated
5.1.17 Supplementaryrequirements,ifany(S1throughS4),
pressures and outlet-rated pressures selected from the follow-
and
ing categories: 400-, 1500-, 3000-, and 6000-psig (2.8-, 10.3-,
5.1.18 Maximumvibrationfrequency,ifotherthanspecified
20.7-, and 41.4-MPa gage pressure). The inlet and outlet
(see S1.1.9).
pressure ratings selected shall be specified in Section 5.
6. Manifold Construction
4.3 End Connections—Manifolds shall have inlet and outlet
end connections selected from those listed in Table 1 and
6.1 Manifoldsshallincorporatethedesignfeaturesspecified
specified in Section 5.
in 6.2 – 6.11.
6.2 Materials of Construction—Material requirements for
5. Ordering Information
the assemblies in the manifold shall be as specified in the
5.1 Ordering documentation for manifolds under this speci-
applicable component specifications referenced herein. Mate-
ficationshallincludethefollowinginformation,asrequired,to rials for all other parts, including the inlet and outlet manifold
describe the equipment adequately:
blocks, shall be 300 series corrosion-resistant steel (SS304,
5.1.1 ASTM designation and year of issue, 304L, 316, or 316L) or other materials selected to provide
F1685 − 00 (2019)
weldability and corrosion resistance without requiring 6.4 Design Construction Requirements:
painting, coating, or plating. The inlet and outlet manifold
6.4.1 Pressure Envelope—The hydrostatic shell test pres-
blocks shall be weld repairable. Materials for contacting parts
sures shall be 1.5 times the manifold rated inlet and outlet
shallbeselectedtominimizeelectrolyticcorrosionandgalling.
pressures.
Metallic materials shall conform to applicable ASTM specifi-
6.4.2 Connections—The main-line inlet and outlet connec-
cations. Nonmetallic materials shall be compatible with the
tions of the manifold, the inlet and outlet connections of the
line medium.
pressure-reducingvalve(s),theconnectionsforthebypassline,
6.3 General Requirements—Manifolds shall incorporate the
and the inlet and outlet connection to the pressure-relief valve
functional elements shown schematically inFig. 1 or Fig. 2,as
shall be takedown joints (unions or other as specified) as
applicable, and delineated below:
specified in Table 1 based on rated pressures specified. Any
(1)Inlet and outlet stop valves,
exposedthreadsshallbeprotectedbyplasticcapsforshipping.
(2)Upstream and downstream bleed valves (for depressur-
The main-line inlet and outlet connection of the manifold and
ization of all components and fluid cavities),
the inlet and outlet connection for the pressure-reducing
(3)Pressure-reducing valve(s),
valve(s) shall permit axial adjustment to expedite proper
(4)Pressure-relief valve,
installation of the manifold into the piping system and to
(5)Gauge isolation valve, and
facilitate replacement of the pressure-reducing valve(s) with
(6)Bypass throttle valve.
one of another make or model or which is for some other
All components shall be part of a manifold assembly, as
reason not dimensionally identical to the originally installed
shown in Fig. 3 or Fig. 4, as applicable, which requires only
pressure-reducing valve(s). The axial adjustment feature for
oneinletandoneoutletconnectiontothemainflowpathofthe
the pressure-reducing valve(s) shall be included in that portion
piping system in which it is installed. The inlet and outlet
ofthetakedownjointsthatareconnectedtotheinletandoutlet
connections shall be in-line. The manifold shall be fabricated
manifold blocks. If unions in accordance with Table 1 are
from inlet and outlet blocks, with interconnecting piping for
specified for the pressure-reducing valve(s) inlet and outlet
the pressure-reducing valve(s) and bypass throttle valve flow
connections, the thread pieces shall be the portions of the
paths. The manual valves shall be cartridge mounted into the
unions that are attached to the pressure-reducing valve(s). The
inletandoutletmanifoldblocksasshowninFig.3orFig.4,as
rangeoverwhicheachofthefouradjustableconnectionsnoted
applicable.Thepressure-reducingvalveandthepressure-relief
above can be adjusted shall be as specified in Table 2.A
valve shall be mounted by way of takedown connections in
positive and permanent means shall be incorporated to ensure
accordance with Table 1. The manifold shall be capable of
that none of the four adjustable connections can be backed out
meeting all requirements of this specification and provide
beyond their minimum engagement position. The size of the
extendedreliableoperationwhenprotectedbya5-µmnominal/
18-µm absolute filter installed upstream of the manifold inlet main-line inlet and outlet connections of the manifold shall be
and when subjected to conditions specified in Section 5. as specified (see Section 5).
NOTE 1—Pictorial representations are for illustrative purposes only and do not imply design.
FIG. 3 Components of a Manifold Assembly
F1685 − 00 (2019)
FIG. 4 Components of Manifold Assembly
TABLE 2 Adjustable Range of End Connections
6.4.5 Interchangeability—The entire manifold, including
Connection Size Nominal Pipe Size NPS Minimum Adjustment Range of components and all associated piece parts, shall have part
(Dimension Nominal DN) Each Connection, in. (mm)
number identity and shall be replaceable from stock or the
1 3 3
⁄4 and ⁄8 (8 and 10) ⁄8 (10)
manufactureronanonselectiveandrandombasis.Partshaving
1 3 1 1
⁄2, ⁄4,1,and1 ⁄4 (15, 20, 25, and ⁄2 (13)
the same manufacturer’s part number shall be directly inter-
32)
1 3
1 ⁄2 and 2 (40 and 50) ⁄4 (19)
changeable with each other with respect to installation (physi-
cal) and performance (function). Physically interchangeable
assemblies,components,andpartsarethosethatarecapableof
being readily installed, removed, or replaced without
alteration, misalignment, or damage to parts being installed or
6.4.3 Manifold Mounting—The manifold shall be given
to adjoining parts. Fabrication operations such as cutting,
structural integrity by means of a subplate provided as part of
filing, drilling, reaming, hammering, bending, prying, or forc-
themanifold.Thesubplateshallbeanangleformtoprovidean
ing shall not be required.
accurate mounting surface for both back and bottom mounting
6.4.6 Nonmetallic Element Interchangeability—
and shall be bolted to the inlet and outlet manifold blocks in
Nonmetallic elements, including but not limited to, seat rings,
such a way as to not interfere with mounting the manifold to a
poppet seat inserts, cushions, and O-rings, shall be treated as
foundation plate. The manifold shall be drilled and tapped or
separately identified and readily replaceable parts.
through-drilled to allow either bottom mounting or back
6.4.7 Pressure Gage—The manifold shall be provided with
mounting as specified (see Section 5).All components shall be
fully and easily accessible for operation, service, or removal a ⁄4-in. (DN 8) threaded gage connection port to permit
attachment of a pressure gage for sensing the outlet pressure.
from the manifold.
6.4.4 Threads—Threads shall be as specified in ASME The gage connection under all operating conditions shall be
located to measure accurately pressure at the manifold outlet
B1.1. Where necessary, provisions shall be incorporated to
prevent the accidental loosening of threaded parts. The design connection when using either the pressure-reducing valve or
thebypassthrottlevalvetocontrolflow.Agageisolationvalve
shallbesuchthatstandardwrenchescanbeusedonallexternal
bolting. Lock wire shall not be used. shall be provided in the manifold.
F1685 − 00 (2019)
6.4.8 Bleed Valves—Bleed valves as shown in Fig. 1 and pressure buildup in a depressurized volume (with maximum
Fig.2shallbeprovidedtoallowdepressurizationofpipingand pressure upstream) to 200-psig (1379-KPa gage pressure) per
components. second. Downstream volumes for this pressurization rate
requirementshallbetakenastheapplicablemanifoldvolumes.
6.5 Component Requirements:
For design and test purposes, a stop valve not more than ten
6.5.1 Pressure-Reducing Valve—Pressure-reducing valve(s)
diameters downstream of the manifold outlet connection shall
incorporated in the manifold shall be in accordance with
be assumed.
Specification F1795, Type I construction. The pressure rating
6.5.3.6 Bypass Throttle Valve—The bypass throttle valve
shall be in accordance with 4.2 and shall equal the manifold
shall be sized to pass full-rated flow of the manifold and
inlet pressure rating.
control the outlet pressure at all flow demands and inlet
6.5.1.1 Pressure Reversal—The manifold shall withstand,
pressures within the range of the manifold.
without damage, a condition in which the pressure-reducing
valve is subjected to a maximum reverse pressure differential. 6.6 Manifold Envelope Dimensions—Manifold envelope di-
This can occur where the maximum set pressure exists at the
mensions shall be as specified in Fig. 3 or Fig. 4 and Table 3,
pressure-reducing valve outlet, the pressure-reducing valve as applicable.
loading element is deactivated (that is, if it is a spring-loaded,
6.7 Maintainability—The manifold shall permit direct ac-
pressure-reducingvalve,thesetspringadjustmentisbackedoff
cess for disassembly, repair, and reassembly of all internal
fully; and if a gas-dome loaded pressure-reducing valve, the
working parts and subassemblies when mounted for operation
dome charge is vented off completely), and inlet pressure is
onitssubplateandinstalledintothesystem.Maintenanceshall
vented off.
require standard tools to the maximum extent possible. Any
6.5.2 Pressure-Relief Valve—The requirements and defini-
special tools required for maintenance shall be identified and
tions for the pressure-relief valve incorporated in the manifold
shall be supplied when ordered (see Section 5).
shall be as specified in Specification F1508.
6.8 Reversibility—Seating inserts shall not be physically
6.5.3 Manual Valves—The requirements for the manual
reversible unless they are also functionally reversible to
valves incorporated in the manifold shall be as specified in
preclude incorrect assembly.
6.5.3.1 – 6.5.3.6.
6.5.3.1 Mounting—All manual valves shall be cartridge
6.9 Adjustments—There shall be no adjustments required in
mounted into the manifold blocks.
the manifold during or after assembly other than the axial
6.5.3.2 Seats—Each manual valve shall incorporate a non-
positioning of the takedown connections for installation of the
metallic seating feature for tight shutoff.
pressure-reducing valve into the manifold or installation of the
6.5.3.3 Handwheel Operating Force—For hand-operated
manifold into the system and the set points of the pressure-
valves, the maximum permissible total tangential force re-
reducing valve and the pressure-relief valve.
quired on the rim of the handwheel for operating, or seating/
6.10 Reliability—Periodic maintenance of the manifold or
unseating the valves shall not exceed 50 lbs (220 N) when the
any of its components shall not be required. There shall be no
valve is subjected to the maximum operating pressure.
postassembly lubrication required.
6.5.3.4 Bidirectional Shutoff—All manual valves shall be
capable of operation and tight shutoff when pressure is applied 6.11 Ruggedness—To the maximum extent practical, the
in either direction. manifold and its components shall be designed to prevent
6.5.3.5 Pressurization Rate—All manual valves shall be damage, malfunction, or leakage as a result of foreign particle
capable of being operated to limit the rate of downstream or other line media contamination or from mishandling.
TABLE 3 Envelope Dimensions of Manifolds
Manifold Size Distance Between Takedown
C ±0.12 in. C ±0.12
(Inlet× Outlet), in. Joints (At Adj Mid-Pt)
D (Max) E ±0.06 in. FMin G ±0.06
Configuration 1–1 Configuration 2–1
(DN Metric)
in. (mm) (±2 mm) (mm) (±2 mm)
A ±0.12 in. B ±0.12 in.
(±3 mm) (± 3 mm)
(±3 mm) (±3 mm)
1 1 1 1 1 1
⁄4 × ⁄4(DN8×8) 19(483) 6 ⁄4 (159) 6 ⁄2 (165) 9 ⁄2 (241) 12 (305) 4 (102) 3 ⁄2 (89) 5 (127)
1 1 1 1 1 1 1 3 3
⁄4 × ⁄2 (DN 8 × 15) 19 ⁄2 (495) 6 ⁄2 (165) 7 (178) 10 ⁄4 (260) 12 ⁄4 (311) 4 ⁄4 (108) 3 ⁄4 (95) 5 ⁄8 (137)
1 3 3 1 1 1 1 1
⁄4 × ⁄4 (DN 8 × 20) 20 (508) 6 ⁄4 (171) 7 ⁄2 (191) 10 ⁄4 (260) 12 ⁄2 (318) 4 ⁄2 (114) 4 (102) 6 ⁄8 (156)
3 3 1 3 1 1
⁄8 × ⁄8 (DN 10 × 10) 21 (533) 7 (178) 8 (203) 11 ⁄2 (292) 13 (330) 4 ⁄4 (121) 4 ⁄2 (114) 6 ⁄4 (159)
3 1 1 1 1 1 1 3 5
⁄8 × ⁄2 (DN 10 × 15) 21 ⁄2 (546) 7 ⁄4 (184) 8 ⁄2 (216) 12 ⁄4 (311) 13 ⁄4 (337) 5 (127) 4 ⁄4 (121) 6 ⁄8 (169)
3 3 1 1 1
⁄8 × ⁄4 (DN 10 × 20) 22 (559) 7 ⁄2 (191) 9 (229) 13 (330) 13 ⁄2 (343) 5 ⁄4 (133) 5 (127) 7 (178)
1 1 1 1 1
⁄2 × ⁄2 (DN 15 × 15) 23 (584) 8 (203) 9 ⁄2 (241) 14 (356) 14 (356) 5 ⁄2 (140) 5 (127) 7 ⁄4 (184)
1 3 1 1 3 1 3 1 5
⁄2 × ⁄4 (DN 15 × 20) 23 ⁄2 (597) 8 ⁄4 (210) 10 (254) 14 ⁄4 (375) 14 ⁄4 (362) 5 ⁄4 (146) 5 ⁄4 (133) 7 ⁄8 (194)
1 1 1 1 1 1
⁄2 × 1 (DN 15 × 25) 24 (610) 9 ⁄2 (241) 10 ⁄2 (267) 15 ⁄2 (394) 14 ⁄2 (368) 6 (152) 5 ⁄2 (140) 8 (203)
3 3 1 1 1
⁄4 × ⁄4 (DN 20 × 20) 25 (635) 9 (229) 11 (279) 16 ⁄2 (419) 15 (381) 6 ⁄4 (159) 5 (146) 8 ⁄4 (210)
3 1 1 1 1 1 1 5
⁄4 × 1 (DN 20 × 25) 25 ⁄2 (648) 9 ⁄4 (235) 11 ⁄2 (292) 17 ⁄4 (438) 15 ⁄4 (387) 6 ⁄2 (165) 6 (152) 8 ⁄8 (219)
3 1 1 1 3 1
⁄4×1 ⁄4 (DN 20 × 32) 26 (660) 9 ⁄2 (241) 12 (305) 18 (457) 15 ⁄2 (394) 6 ⁄4 (171) 6 ⁄4 (159) 9 (229)
3 1 1 1 3 1
⁄4×1 ⁄2 (DN 20 × 40) 26 (660) 9 ⁄2 (241) 12 (305) 18 (457) 15 ⁄2 (394) 6 ⁄4 (171) 6 ⁄4 (159) 9 (229)
1 1 1 1
1×1(DN25×25) 27(686) 10 (254) 12 ⁄2 (318) 18 ⁄2 (470) 16 (406) 7 (178) 6 ⁄2 (165) 9 ⁄2 (241)
1 1 1 1 1 1 7
1×1 ⁄4 (DN 25 × 32) 27 ⁄2 (699) 10 ⁄4 (260) 13 (330) 19 ⁄4 (489) 16 ⁄4 (413) 7 ⁄4 (184) 6 (171) 9 ⁄8 (251)
1 1 1 1 1 1 3 7
1×1 ⁄2 (DN 25 × 40) 27 ⁄2 (699) 10 ⁄4 (260) 13 (330) 19 ⁄4 (489) 16 ⁄4 (413) 7 ⁄4 (184) 6 ⁄4 (171) 9 ⁄8 (251)
1 1 1 1 1 1
1×2(DN25×50) 28(711) 10 ⁄2 (267) 13 ⁄2 (343) 19 ⁄2 (495) 16 ⁄2 (419) 7 ⁄2 (191) 7 (178) 10 ⁄2 (267)
...