Euro Flow Control
A203 Pressure Reducing with Check Valve4 of 30 control valvesA400 Flow Control Valve
Control Valve
Part of the A900 modular system

A300 Slow Control Check 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, BS EN 12266-1
Face to face
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 Screws
Bush
Cap
Caulking Nut
Diaphragm
Disc Holder
Eye Bolts
Fix Washer
Fixing Holder
O Rings
Plug
Seal
Seal Retainer
Seat Retainer
Washer

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(2 pages)

Operating media

Water

Typical applications

  • Pump discharge
  • Pump stations
  • Booster stations
  • Water transmission
  • HVAC differential-pressure / balancing duty

Coatings

Fusion bonded epoxy on all iron components

Approvals

ISO 9001

Features

  • Slow-closing check valve: closes slowly for return water to prevent pressure surge
  • Globe design for superior control characteristics
  • Top and seat ring guided stem and diaphragm assembly for long life and reliability
  • Nylon reinforced diaphragm for long term service
  • All iron components are fusion epoxy bonded for corrosion resistance
  • Ductile iron bodies for higher strength and durability
  • Corrosion resistant stainless steel seat and disc retainer ring
  • Drip tight shut off
  • Easy maintenance without removal from the main line
  • Various pilots and accessories available for configuration into many different applications
  • Special V-Port and double chamber are options, consult factory

Description

The A300 is a slow check valve that closes slowly for return water, preventing the pressure surge associated with rapid check valve slam. Built on the A900 globe-pattern diaphragm body, it operates via a hydraulic pilot circuit with ball valves and tubing. Various pilots and accessories are available for configuration into many different applications.

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 Stainless Steel AISI 304 and Stainless Steel 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 and HVAC.

Working temperature is -10°C to 80°C.

Built to EN 1074-5, BS EN 1074-5, BS EN 558-1, ISO 5208 and BS EN 12266-1.

Supplier remarks

  • Control-tube construction is size-dependent per source: DN50-DN150 uses a single control pipe, DN200 and above uses two pipes.

Available pressure classes

Pressure classes this product is rated to.

PN10PN16PN25

Used in

Water & WastewaterHVAC

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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Pilot assembly & accessories

Compatible accessories

Needle Valve

Adjusts response speed and damps oscillation in the pilot circuit

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Add variant details

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