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Fig. M425 Pressure Reducing Valve

Verified by manufacturer 13 days ago

DN100

Hattersley Variant:

Ductile iron pressure reducing valve, PN25.

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Application

Suitable for drinking water applications only (medium use), up to 85°C.

Description

Ductile iron pressure reducing valve, PN25.


Features and benefits:

  • PRVs enable control of pressure from boosted cold water supplies to match site requirements.
  • Has a pilot valve assembly to enable accurate pressure control.
  • Easy setting of the outlet pressure using built-in pressure gauge.
  • Simple to install.
  • Sizes DN100 and DN150.

General information

Color

Blue

Guidance for specification option:

Body.

Yellow

Brown

Silver

Material

Ductile iron

Guidance for specification option:

Ductile iron, disc, diaphragm disc, O-ring and cover.

Brass

Guidance for specification option:

Plug, adaptor and air release nut.

Stainless steel

Guidance for specification option:

Body seat, seat locking bolt and long bolt, spring washer, bolt, stem, washer, nut.

Steel

Guidance for specification option:

Guide cover bolts and lifting nut.

Aluminium

Guidance for specification option:

Nameplate.

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Product range

Public Health

Specification data - Pressure-regulating valves

Standard

To BS EN 558 Series 1.

Third-party certification

Water Regulations Advisory Scheme-approved.

Form

Water pressure reducing.

Adjustment

Adjustable.

Operating conditions

-

Temperature (maximum)

85°C.

Maximum working pressure

25 bar.

Guidance for specification option:

  • Fig. M425.
  • PN25 flanged can only be used to a maximum operating inlet pressure of 18 bar.
  • Refer to Cavitation Chart, inlet and outlet pressure, in IOM.

Connections

Flanged to BS EN 1092-2.

Inlets/outlets diameter

DN100.

Manufacturer guidance

Nominal dimension: Equals thread size.

Dimensions

350 x 390 x 43 x 43 mm.

Manufacturer guidance

  • Nominal A x B x C.
  • Minimum space required for maintenance and to allow for the pilot valve, pipework and fittings, which can exceed the width ‘A’ and height ‘B’ of the valve.
  • The dimensions are for the complete valve assembly including basic valve, pressure gauge and pilot valve.

Weight

43 kg.

Material (all components)

Body, disc, diaphragm disc, O-ring and cover: Ductile iron, Plug, adaptor and air release nut: Brass, Body seat, bolt locking plate, washer bolt and nut: Stainless steel, Seat locking bolt and long bolt: Stainless steel grade 304, Stem: Stainless steel grade 303, Spring: Stainless steel grade 302, Washer, spring washer, nut and bolt: Stainless steel grade 316, Nameplate: Aluminium, Disc facing, O-ring and diaphragm: Rubber, Lifting nut and guide cover bolts: Steel, Guide cover: Brass/ bronze, Disc guide: Bronze and stainless steel.

Integral accessories

Strainer, built-in pressure gauge and pilot valve.

Manufacturer guidance

Built-in with PRV unit.

DownstreamPressure

0.5–6 bar.

FlowRateRange

1–160 m³/h.

Manufacturer guidance

  • Minimum and maximum recommended flowrate for continuous operation.
  • Flow velocity = 5.5 m/s at maximum flowrate.

Volume

0.7 L.

Manufacturer guidance

Control chamber volume.

Flow capacity

167 m³/h.

Manufacturer guidance

Flow coefficient Kv.

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