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Control Valve
Part of the A900 modular system

A2A5 Surge Anticipating Control Valve

Datasheet

Download datasheet (PDF)

Specifications are indicative. Final specification is confirmed at quotation.

Specifications

Confirmed at quote
Size Range
DN50 to DN800
Pressure Class
PN10, PN16, PN25
End connection
Flanged
Operating temperature
-10°C to 80°C

Standards

Design & manufacture
EN 1074-5, BS EN 1074-5
Inspection & test
ISO 5208, EN 12266-1, BS EN 12266-1
Face to face
EN 558-1, BS EN 558-1

Configure your variant(manually adjust box on the right if you require a different spec)

Size
Pressure
End connection

Materials

All available material options per part. Click a pill to set it in the configurator.

Body
Bonnet
Seat
Stem
Spring
Bolts Washers
Bush
Cap
Diaphragm
Disc Holder
Eye Bolts
Fix Washer
O Rings
Pilot Anticipation Adjusting Screw
Pilot Anticipation Body
Pilot Anticipation Bonnet
Pilot Anticipation Cap
Pilot Anticipation Diaphragm
Pilot Anticipation Disc
Pilot Anticipation Fixing Holder
Pilot Anticipation Internal Body
Pilot Anticipation Jam Nut
Pilot Anticipation Nut
Pilot Anticipation O Ring
Pilot Anticipation Plug
Pilot Anticipation Screw
Pilot Anticipation Spring
Pilot Anticipation Spring Table
Pilot Anticipation Yoke
Pilot Sustaining Adjusting Screw
Pilot Sustaining Body
Pilot Sustaining Bonnet
Pilot Sustaining Cap
Pilot Sustaining Diaphragm
Pilot Sustaining Disc
Pilot Sustaining Fixing Holder
Pilot Sustaining Gasket
Pilot Sustaining Internal Body
Pilot Sustaining Jam Nut
Pilot Sustaining Nut
Pilot Sustaining O Ring
Pilot Sustaining Screw
Pilot Sustaining Spring
Pilot Sustaining Spring Table
Pilot Sustaining Stem
Seal
Seal Retainer
Seat Retainer

Pressure-temperature rating

Maximum working pressure at each temperature, per pressure class.

ClassPressureMin tempMax temp
PN1010 bar-10°C80°C
PN1616 bar-10°C80°C
PN2525 bar-10°C80°C
Dimensions per size(16 sizes)
SizeL (mm)PN10 ØD (mm)PN16 ØD (mm)PN25 ØD (mm)PN10 ØK (mm)PN16 ØK (mm)PN25 ØK (mm)H (mm)PN10 N-Ød (mm)PN16 N-Ød (mm)PN25 N-Ød (mm)PN10 ØB (mm)PN16 ØB (mm)PN25 ØB (mm)Model CodeWeight
DN502301651651651251251251774-Ø194-Ø194-Ø19999999A900-0050
—
DN652901851851851451451452024-Ø194-Ø198-Ø19118118118A900-0065
—
DN803102002002001601601602198-Ø198-Ø198-Ø19132132132A900-0080
—
DN1003502202202351801801902438-Ø198-Ø198-Ø23156156156A900-0100
—
DN1254002502502702102102202438-Ø198-Ø198-Ø28156156156A900-0125
—
DN1504802852853002402402503338-Ø238-Ø238-Ø28211211211A900-0150
—
DN2006003403403602952953104288-Ø2312-Ø2312-Ø28266266274A900-0200
—
DN25073040540542535035537047812-Ø2312-Ø2812-Ø31319319330A900-0250
—
DN30085046046048540041043053812-Ø2312-Ø2816-Ø31370370389A900-0300
—
DN35098052052055546047049055016-Ø2316-Ø2816-Ø34429429448A900-0350
—
DN400110058058062051552555071016-Ø2816-Ø3116-Ø37480480503A900-0400
—
DN450120064064067056558560072020-Ø2820-Ø3120-Ø37530548548A900-0450
—
DN500125071571573062065066082220-Ø2820-Ø3420-Ø37582609609A900-0500
—
DN600145084084084572577077088520-Ø3120-Ø3720-Ø40682720720A900-0600
—
DN700165091091096084084087591024-Ø3124-Ø3724-Ø43682720720A900-0700
—
DN8001850102510251085950950990126024-Ø3424-Ø4024-Ø49901901928A900-0800
—

* DN125 and DN350 use the same internals as DN100 and DN300 respectively.

* DN450 and DN700 use the same internals as DN400 and DN600 respectively.

* AISI 304 is the factory standard stainless steel grade; consult the factory for AISI 316.

Technical drawings(3 pages)

Operating media

Water

Typical applications

  • Complex pressure zone boundaries
  • Surge-sensitive networks
  • Water distribution

Approvals

WRASISO 9001

Features

  • The A2A5 is a surge anticipating control valve that opens to relieve overpressure before a surge wave reaches its full magnitude
  • A pressure sensing pilot monitors the pipeline and begins opening the valve as soon as pressure rises above the set point, discharging to atmosphere or a recirculation line to absorb surge energy
  • This anticipatory action is more effective than a simple relief valve, which only opens after the surge has already peaked

Description

The A2A5 is a surge anticipating configuration of the A900 main valve body, fitted with a P20A pressure sensing pilot. The pilot monitors line pressure and begins opening the valve as soon as pressure rises above the set point, discharging to atmosphere or a recirculation line to absorb surge energy before it reaches its full magnitude. This anticipatory action is more effective than a simple relief valve, which only opens after the surge has peaked. Used at pump stations and long transmission mains susceptible to water hammer.

Selection notes

This control valve is supplied for flanged installation.

Sizes run DN50 to DN800, in PN10, PN16, PN25.

The body is EN-GJS-500-7.

Seat and trim options are AISI 304 and AISI 316. The seat, not the body, usually sets the temperature and medium limit, so confirm it against the service before ordering.

Stated service media include water.

It is catalogued for Water & Wastewater.

Working temperature is -10°C to 80°C.

Built to EN 1074-5, BS EN 1074-5, EN 558-1, BS EN 558-1 and ISO 5208.

Supplier remarks

  • Piping arrangement: main valve, needle valve, P500 sustaining pilot, P20A anticipation pilot, ball valve, optional inlet pressure gauge, strainer.

Available pressure classes

Pressure classes this product is rated to.

PN10PN16PN25

Used in

Water & Wastewater

Related guides

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A900 configurations

View full A900 system →
This product is part of the A900 modular system. All configurations share the same hydraulically operated body: the control function is set by the pilot valve(s) attached. An existing A900 body in the field can be reconfigured for a different duty simply by swapping the pilot, without replacing the body.

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DN50 to DN200

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DN50 to DN800

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DN50 to DN300

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Pilot assembly & accessories

Pilot assembly

P20A Differential Pressure Pilot

Pressure sensing pilot: monitors line pressure and begins opening the valve as pressure rises above the set point, ahead of the surge peak

Compatible accessories

Needle Valve

Adjusts response speed and damps oscillation in the pilot circuit

Related Control Valves

A100 Modulating Float Control Valve
Control ValveREF 344

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Type
Control Valve
Size
DN50 to DN800
Pressure
PN10, PN16, PN25
Body
EN-GJS-500-7
Standards
EN 1074-5, BS EN 1074-5
Add variant details

Adds to your quote request, not a purchase. Refine size, pressure and material before submitting.

A200 Pressure Reducing ValveControl ValveREF 345

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Type
Control Valve
Size
DN50 to DN800
Pressure
PN10, PN16, PN25
Body
EN-GJS-500-7
Standards
EN 1074-5, BS EN 1074-5
Add variant details

Adds to your quote request, not a purchase. Refine size, pressure and material before submitting.

A203 Pressure Reducing with Check ValveControl ValveREF 346

A203 Pressure Reducing with Check Valve

Type
Control Valve
Size
DN50 to DN800
Pressure
PN10, PN16, PN25
Body
EN-GJS-500-7
Standards
BS EN 1074-5, BS EN 558-1
Add variant details

Adds to your quote request, not a purchase. Refine size, pressure and material before submitting.

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Type
Control Valve
Size
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Pressure
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Body
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Standards
EN 1074-5, BS EN 1074-5
Add variant details

Adds to your quote request, not a purchase. Refine size, pressure and material before submitting.