Series: VGR16

PN16 Resilient Seated

Gate Valves

DN50 - DN600

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Dobbie Resilient Seated Gate Valves

Gate Valve or Sluice Valve: The great naming debate

The correct terminology referencing control valves for fluid media has, for many years, been hotly debated and settling on

the appropriate term has often been difficult for industry. Historically, below ground valves (BGV) with their heavier, more

robust construction designed to cope with the endurance required of a buried service, have been referred to as ‘Sluice

Valves’.

These valves were traditionally cement lined with a black bituminous coating and supplied without hand-wheels. Valves to be

installed above ground (AGV), were constructed with a lighter body and were normally nominated as ‘Gate Valves’.

AGVs were commonly supplied with a handwheel, although not in every case.

With the advent of Red Oxide coatings and the market entry of Fusion Bonded Epoxy (FBE) and similar advanced polymeric

coating systems the issue of corrosion resistance was largely overcome. This resulted in heavy grey cast iron bodies

becoming essentially redundant and consequently, a uniform design strategy for both BGV and AGV has evolved. This has not

only significantly reduced the manufacturing costs but rendered the distinction between AGV and BGV largely academic.

Consequently in today’s market they are all simply referred to as ‘Gate Valves’.

Dobbie Resilient Seated Gate Valves

Dobbie has been in the business of manufacturing and supplying Resilient Seated Gate Valves compliant with AS/NZS 2638.2

since 1990. Dobbie Resilient Seated Gate Valves are non-rising stem (NRS) design, where the gate traverses a

431 stainless steel spindle. Valves may be configured as either Clockwise (CC) or Anti-Clockwise (ACC) closing in accordance

with client specification. They are suitable for use in either above ground or a below ground applications and can be installed

either in a horizontal or vertical aspect. Dobbie Resilient Seated Gate Valves have been design engineered right here in

Australia for high abrasion resilience, robust impact resistance and durability. They provide long term, trouble free

performance coupled with minimal maintenance obligations once installed. They are proven performers with a solid

reputation.

Dobbie Resilient Seated Gate Valves are supplied pressure rated to PN16 as standard, however we are able supply valves up

to PN25 upon request. Valves are offered with flange connections compliant to AS/NZS 4087 (Metallic Flanges for

Waterworks Purposes) or with socket end connections compliant to AS/NZS 2280 (Ductile Iron Pipes and Fittings). The body

and cover castings are cast using high quality 500-7 ductile iron and are coated with a thermally bonded polymeric coating

to AS/NZS 4158.

This attractive and high quality form of coating provides excellent protection against corrosion and imparts significant

resistance to abrasion.

Dobbie Resilient Seated Gate Valves are supplied with a ductile iron gate, encapsulated in AS 1646 approved EPDM rubber.

This provides both a drop tight seating and brings significant wear resistance into the design. EPDM gaskets (also certified

to AS 1646) are fitted between the body and cover, with NBR O-Rings providing a seal between the gland and operating

mechanism. These seals perform double duty in also preventing debris and foreign objects from entering the gland housing.

As per AS/NZS 2638.2 requirements, the spindle O-Rings are capable of being replaced in-situ under normal operating

pressure.

This prevents spindle leakage while ‘in-the-field’ maintenance is performed.

Options for control mechanisms fitted at time of supply include:

• Key Cap

• Handwheel

• Gearbox ready

• Gearbox

• Gearbox and Actuator

Direction of Actuation

Dobbie Gate Valves feature a multi turn design (NRS) and are offered in either Clockwise Closing or Anti-Clockwise Closing

configurations. Direction of operation is indicated via directional arrows on the key cap or handwheel and colour coded caps

or inserts.

• Clockwise Closing (CC): Red

• Anti-Clockwise Closing (ACC): Blue

Note: Always check with local Water Authorities to confirm colour coding relevant to each installation.

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Dobbie Resilient Seated Gate Valves

Dobbie Resilient Seated Gate Valves

Gate Valves are ‘isolation’ type valves utilising a sliding wedge plate (gate) to interact within a flow path and are primarily

employed to prevent or facilitate the flow of fluid media. Dobbie’s planar sealing system is ideal for straight-line flow

applications where minimal flow restriction is required. When fully open, a Dobbie Gate Valve has little or no obstruction

in the flow path, resulting in very low friction loss.

Dobbie Resilient Seated Gate Valves come in a range of configurations:

• NRS (Non Rising Stem)

• ACC / CC

• Flange Connections: AS/NZS 4087

• Flange Options: (ANSI / ASME, BSEN 1092, etc.) or as per custom

• Pressure Ratings: PN16 / PN25

• Standard Key Cap / Handwheel

• Gearbox Ready / Gearbox / Actuator

Gate Valves should only be operated in either a fully open or fully closed position. It is inadvisable to employ singular gate

valves for modulating the flow of the media or for throttling purposes. These are tasks more suited to the use of Globe or

Butterfly Valves, or the utilisation of Orifice Plates. The high and irregular velocities associated with throttling a strong media

flow create turbulence and cavitation which can lead to numerous problems including: vibration in the line (causing

water hammer / hydraulic shock); chattering / fretting wear; body, gate, or sealing ring damage to the valves. Highly turbulent

flow systems may inflict collateral damage upon downstream systems and pipe services. Damage to Gate Valves is not easily

rectified on site, and repair in the workshop is the only viable way to ensure that the valve will operate correctly again once

returned to operational service. This is an expensive exercise, best avoided whenever possible through correct selection,

placement, installation & use of valves.

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• AS/NZS 4020 approval make them well suited to applications involving the transfer and control of potable (drinking) water.

• Offer an increased ability to effectively seal against foreign objects (i.e. stones, debris, detritus, etc.), as the EPDM synthetic

elastomer encapsulation of the wedge provides a pliant surface which absorbs impacts.

• As per AS 2638.2, valves are thoroughly tested to a minimum 1.5 times their rated operational pressure.

• Fully encapsulated wedges are corrosion free.

• Resilient Seated Gate Valves present a clear, smooth and unobstructed waterway, one that does not exhibit a potentially

debris-trapping sump beneath the seat closure position. This reduces the amount of foreign matter that may become

trapped in the closing mechanism making Resilient Seated Gate Valves very suitable for waste water applications.

• The full bore waterway also limits flow inhibition and friction loss.

• Suitable for above or below ground applications.

• Low torque values mean easy operation and extended service life.

• Minimal maintenance obligations.

Typical Gate Valve Applications

Mains Water Lines Trunk/Ring Mains Storm Water Sewer Lines

Fire Services Recycled Water Waste Water Plants Static Water Stations

Desalination Plants Pump Stations

Pipe Compatibility with Gate Valves

Dobbie Metal Seated Gate Valves are suitable for use on a wide range of piping materials.

Typical pipe materials include:

Series 1 PVC (O,M,U) Series 2 PVC (O,M,U) PE

GRP MSCL HDG STEEL

HEAVY STEEL (SCHED #40) DUCTILE IRON AC

Dobbie Resilient Seated Gate Valves

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3D Sectional View of Resilient Seated Gate Valve

Dobbie Resilient Seated Gate Valves: Benefits

RS

SIZE RANGEALLOWABLE WORKING

PRESSURESEAT TEST TO

AS2638.2MAXIMUM

TEMPERATUREOPERATINGDIRECTION

HANDWHEEL OPERATING CAP GEARBOXISO FLANGING

FOR ACTUATIONVALVE SPINDLE

EXTENSIONAS2129 T/E

FLANGE DRILLING

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Va

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Resilient Seated Gate ValveFlange - FlangeDN50 - DN600

FEATURES

STANDARD SPECIFICATIONS

TECHNICAL SPECIFICATIONS

GENERAL APPLICATIONS

OPTIONAL EXTRAS

BODY TEST TOAS2638.2

Ductile iron body and bonnet for high strength and impact resistance.

Ductile iron gate fully encapsulated in EPDM rubber to ensure drop tight sealing.

Grade 431 stainless steel spindle for high strength and corrosion resistance.

Back seal to allow for replacement of stem seals under full operating pressure.

Isolated fasteners to stainless steel grade 316 for corrosion protection.

Straight through full bore.

Stem nut is separated from the gate to avoid galling.

Lifting point for installation convenience.

Internal and External epoxy resin coating for long life corrosion protection.

APPROVALS

AS 2638.2 Registration No.OMK 22568

Watermark Registration No. WM - 022568

Certified to AS/NZS 4020 - suitable for contact with drinking water

AS/NZS 4158 AKZO or JOTUN Epoxy Resin Powder

EPDM rubber Certified to AS 1646

Ductile iron stem seal replaceable resilient seated gate valves are suitable for use with drinking water, waste water and natural

liquids, below or above ground applications. Used for the isolation of sections and branches in pipelines.

DN50-DN600 1600Kpa 1760Kpa 2400Kpa 40ºC CC / ACC

Designed and Certified to AS 2638.2

Face to face dimensions to AS 2638.2

Double Flanges drilling to AS 4087 Figure B5 equal to AS 2129 Table / D

Operating torque test to AS 2638.2 Table 5.1

Available Available Available Available Available Available

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Dimension Table (AS2129-2000 & AS4087-1996)

Civil / Fire Sales e: allanr@dobbie.com.au

Fire / Civil Sales e: marks@dobbie.com.au

Civil / Fire Sales Manager e: deanc@dobbie.com.au

Dobbie

430 Victoria Road, Malaga. WA 6090

T: 08 9249 7000 F: 08 9249 7700

Resilient Seated Gate ValveFlange - FlangeDN50 - DN600

Part No. Part Description Material Material Grade Standards Ref

Component List

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Details shown may be subject to change due to Dobbie continual product development

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

Body

Wedge

Stem Nut

Stem

Body Bonnet Gasket

Bonnet

O-Ring

Washer

Bonnet O-Ring

Washer

Seal Retainer

Dustproof Cover

Plastic Cap

Stem Cap Bolt

Stem Cap

Thrust Collar

O-Ring

Body Bonnet Bolt

Top Bonnet Bolt

Ductile Iron

Ductile Iron & Synthetic Elastomer

Aluminium Bronze

Stainless Steel

Synthetic Elastomer

Ductile Iron - Epoxy Resin Powder

Synthetic Elastomer

Engineering Plastic

Synthetic Elastomer

Gunmetal

Stainless Steel

Synthetic Elastomer

Plastic

Stainless Steel

Ductile Iron

Engineering Plastic

Synthetic Elastomer

Stainless Steel

Stainless Steel

500-7

500-7 & EPDM Encapsulated

C48600

1Cr17Ni2

EPDM

500-7

NBR

ACETYL

NBR

C48600

SS316

EPDM

SS316

500-7

POM

NBR

SS316

SS316

AS 1831

AS 1831 & AS 1646

AS 1568

ASTM A276

AS 1646

AS 1831

AS 1646

AS 1646

AS 1646

AS 1568

ASTM A276

AS1646

ASTM A276

AS 1831

AS 1646

AS 1646

ASTM A276

ASTM A276

*100mm Valve Shown

150mm Flange Detail

All Other Size Flanges

RS

SIZE RANGEALLOWABLE WORKING

PRESSURESEAT TEST TO

AS2638.2BODY TEST TO

AS2638.2MAXIMUM

TEMPERATUREOPERATINGDIRECTION

HANDWHEEL OPERATING CAP GEARBOXISO FLANGING

Resilient Seated Gate Valve

Socket - Socket

DN100 - DN375

TECHNICAL SPECIFICATIONS

GENERAL APPLICATIONS

OPTIONAL EXTRAS

Available Available Available Available Available

VALVE SPINDLE FOR ACTUATION EXTENSION

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- Socket/Socket

FEATURES

STANDARD SPECIFICATIONS

Ductile iron body and bonnet for high strength and impact resistance.

Ductile iron gate fully encapsulated in EPDM rubber to ensure drop tight sealing.

Grade 431 stainless steel spindle for high strength and corrosion resistance.

Back seal to allow for replacement of stem seals under full operating pressure.

Isolated fasteners to stainless steel grade 316 for corrosion protection.

Straight through full bore.

Stem nut is separated from the gate to avoid galling.

Lifting point for installation convenience.

Internal and External epoxy resin coating for long life corrosion protection.

Designed and Certified to AS 2638.2

Socket suitable for use with Series 1 & 2 PVC pipe

Operating torque test to AS 2638.2 Table 5.1

APPROVALS

AS 2638.2 Registration No.OMK 22568

Watermark Registration No. WM - 022568

Certified to AS/NZS 4020 - suitable for contact with drinking water

AS/NZS 4158 AKZO or JOTUN Epoxy Resin Powder

EPDM rubber Certified to AS 1646

Ductile iron stem seal replaceable resilient seated gate valves are suitable for use with drinking water, waste water and natural

liquids, below or above ground applications. Used for the isolation of sections and branches in pipelines.

DN100-DN375 1600Kpa 1760Kpa 2400Kpa 40ºC CC / ACC

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Socket - Socket

DN100 - DN375

Component List

Dimension Table (AS2280 - 2004)

Civil / Fire Sales e: allanr@dobbie.com.au

Fire / Civil Sales e: marks@dobbie.com.au

Civil / Fire Sales Manager e: deanc@dobbie.com.au

Dobbie

430 Victoria Road, Malaga. WA 6090

T: 08 9249 7000 F: 08 9249 7700

Part No. Part Description Material Material Grade Standards Ref

Issue 1.0 18-02-16 DCV015B - RSGV16

Details shown may be subject to change due to Dobbie continual product development

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Body

Wedge

Stem Nut

Stem

Body Bonnet Gasket

Bonnet

O-Ring

Washer

Bonnet O-Ring

Washer

Seal Retainer

Dustproof Cover

Plastic Cap

Stem Cap Bolt

Stem Cap

Thrust Collar

O-Ring

Body Bonnet Bolt

Top Bonnet Bolt

Socket Sealing Ring

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Ductile Iron

Ductile Iron & Synthetic Elastomer

Aluminium Bronze

Stainless Steel

Synthetic Elastomer

Ductile Iron - Epoxy Resin Powder

Synthetic Elastomer

Engineering Plastic

Synthetic Elastomer

Gunmetal

Stainless Steel

Synthetic Elastomer

Plastic

Stainless Steel

Ductile Iron

Engineering Plastic

Synthetic Elastomer

Stainless Steel

Stainless Steel

Synthetic Elastomer

500-7

500-7 & EPDM Encapsulated

C48600

1Cr17Ni2

EPDM

500-7

NBR

ACETYL

NBR

C48600

SS316

EPDM

SS316

500-7

POM

NBR

SS316

SS316

EPDM

AS 1831

AS 1831 & AS 1646

AS 1568

ASTM A276

AS 1646

AS 1831

AS 1646

AS 1646

AS 1646

AS 1568

ASTM A276

AS1646

ASTM A276

AS 1831

AS 1646

AS 1646

ASTM A276

ASTM A276

AS 1646