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DUAL DUAL PLATEPLATE CHECK CHECK

VALVESVALVES

A TECHNICAL PRESENTATION

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Function Of Check Function Of Check ValveValve

“ THE CHECK VALVE ( NRV OR REFLUX VALVE ) IS A PROTECTIVE DEVICE TO PREVENT REVERSE RUN OF EQUIPMENT AND IS THERE TO SLOW DOWN THE FLOW IN THE REVERSE DIRECTION OR TO CUT THE MASS FLOW RATE DOWN TO ABOUT 1 TO 5 % IN THE BACKWARD DIRECTION OF W HAT THE FORWARD FLOW IS”.

- RONALD C. MERRICK

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For Reliable Check Valve For Reliable Check Valve

FunctionsFunctions WHAT YOU DO NOT WANT:

• Valve Slamming

• Valve induced Water Hammer

• Excessive Head loss/Energy loss

• Excessive weight & volume

• Higher cost - capital & life cycle

• Damage & Damage control mechanism

UNFORTUNATELY, SWING CHECK HAS ALL THIS

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Types Of Check Types Of Check ValvesValves

• Swing Check Valve

• Dual Plate Check Valve

Wafer Type,

Lugged Type

Double & Mono-Flanged Type

Special end connections (RTJ, Hub-ended)

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Dual Plate Check Dual Plate Check ValveValve

(As Per API - (As Per API - 594)594)

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Conventional Swing Conventional Swing Check ValveCheck Valve

WEIGHT OF DISC WHICH MAKES IT WORK ALSO BREAKS ITWEIGHT OF DISC WHICH MAKES IT WORK ALSO BREAKS IT

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Valve opening & closing is a function of Valve opening & closing is a function of velocityvelocity


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Valve remains fully open for flow velocity above V min.

Flow Velocity Vs Time GraphFlow Velocity Vs Time Graph

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F = 0.75(Spring Force) +

The weight of the plates does not increase the force required.

The design of the dual plate check valve divides the total force in half, since each plate covers only 1/2 the area of a swing check disc. With 1/2 the force on each plate, it requires only 1/2 the thickness of the plate or 1/4 the mass of a swing check disc.Plate weight has no impact on flow.

F (Friction of Hinge) B

VISUALISE PRESENT TIME DOORS WITH SIDE HINGES AND OLD TIME TOP HINGED DOORS

Lower Pressure DropLower Pressure Drop


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ABOVE DATA IS SIMULATED & VALIDATED

Head Loss v/s Flow RateHead Loss v/s Flow Rate

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WEIGHS ABOUT 1/5 TH OF SWING CHECK AND HAS SHORT FACE TO FACE WIDTH.

VOLUME& WEIGHT SAVES HANDLING EFFORTS.

NO VALVE SUPPORTS REQD. INCLUDING THE ONE PROVIDED TO CONTAIN DAMAGES DUE TO SLAMMING.


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Flexible Flexible InstallationInstallation

Horizontal

Vertical

No Valve Support

No Pipe Rerouting

No Valve Support

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Spring Design Spring Design BasisBasis

SPRING LIFE ASSESSMENT

Light Service : 1,000 to 10,000 Cycles. Average Service : 100,000 to 1,000,000 Cycles Severe Service : Over 1,000,000 Cycles

Dual Plate Check Valve Springs are normally designed for Average Service Conditions for Life

of 100,000-1,000,000 Cycles to match life of valve.

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Dual Plate Wafer Dual Plate Wafer Check ValveCheck Valve

Upside-down InstallationUpside-down Installation

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Advantages At A GlanceAdvantages At A Glance Dual Plate Check Valve V/S Swing Check Dual Plate Check Valve V/S Swing Check

ValveValveDUAL PLATE CHECK VALVE

• Light Weight thus easier handling and self Supporting.

• More compact & structurally sound design.

• Same valve can be installed horizontally or vertically.

• Only Check Valve which can be installed for flow upside down due to spring assisted closure.

• Low pressure Drop & reduced Energy Loss irrespective of Pressure Ratings.

• Streamlined Flow-way• Efficient & Positive sealing under most

flow & pressure conditions. Valve closes before flow reversal, at zero velocity.

• Inherently Non-Slamming, No external devices / attachments required.

• Water Hammer almost non-existent• Long Life and trouble free operation.

SWING CHECK VALVE

• Bulky & voluminous thus cumbersome handling & heavier supporting system.

• Large & difficult to analyse from stress concentration point in critical application due to intricate body shape.

• Suitable primarily for horizontal application.

• Not Possible

• Significant Pressure Loss & Energy Loss, which is still higher for higher pressure ratings.

• Swing restricted flow-way.• Always require reverse flow for closure &

back pressure for effective sealing.

• External attachments required to counteract slamming.

• Water Hammer tendency persists.• Seat & Hinge Pin require regular

maintenance due to impact loads & wear by rubbing.

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Dual Plate Check Valve - Dual Plate Check Valve - Design Design AdvantagesAdvantages

• Compact, Light and Rugged Design• Low Pressure Drop-thus, Lower Energy Loss.• Total flexibility in installation - Horizontal to

Vertical.• Valve closure at zero velocity : Hence, ‘No valve-

induced Water Hammer’.• Inherently non-slamming design without any

external fitments.• Technically Superior always to Swing Check

Valve including multi-door Swing Check Valve. • An Economic Solution right through.

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Dual Plate Check Valve - Dual Plate Check Valve - Structural Structural

AnalysisAnalysis

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(OVER 10 YEARS)

Capital Running O/M

Replacement

Cost Cost Cost

Cost

SWING CHECK VALVE

-> With non-slam fitments 1. 25 < 1 < 1 < 1

-> Standard 1 1 1 1

DUAL PLATE CHECK 0.7 0.4 0.1 0.1

VALVE

NOZZLE CHECK VALVE 1.6 0.5 0.1 0.15

(Based on unit cost for swing check valve)

Check Valve EconomicsCheck Valve Economics

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Global Scene On Global Scene On Check ValvesCheck Valves

• Swing Check Valves above 12”/16” generally need external Anti Slamming Device(s) making it further unwieldy and expensive - first cost & maintenance.

• After initial inertia of rethinking and limited sources of reliable suppliers in the past, the switchover from Mass Movement to Spring Actuation has taken place now.

• Improvement in availability and increasing competitiveness of Dual Plate Check Valves has changed the preference to Dual Plate Check Valves all over in process as well as in water management industries.

• Dual Plate Check Valves upto 12” are available even in ratings upto ANSI 2500 and API 5000 besides sizes upto 72” in lower ratings being most versatile design of Check Valve.

• In India too, trend of switching over to Dual Plate Check Valve is quite noticeable after overcoming initial inertia of rethinking & apprehensions about its high costs.

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Global TrendsGlobal Trends

Switch over to Wafer Check Valve (dual plate

type ) is going on noticeably in Refineries ,

Petrochemicals and Process Industries besides

general industries.

Wherever Swing Check Valves are specified by

process licensors and / or PMCs/EPCs as general

specifications , switchover to Dual Plate Check

Valves is generally welcome but not vice-versa.

SWING CHECK VALVES ARE ON THEIR WAY OUT

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750mm CLASS 150 (Wafer flanged)


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Flow Through Dual Plate Flow Through Dual Plate Check ValveCheck Valve

Crack Opening Flow thru Center

G

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All the technological factors & economic advantages lead to unanimous decision.

USE DUAL PLATE CHECK VALVES FORADVANTAGE TO ALL

TREND IS GLOBAL: WITH ISO 9001 ACCREDITATIONTREND IS GLOBAL: WITH ISO 9001 ACCREDITATIONWE, TOO, ARE READY TO PARTICIPATE GLOBALLY

SAVE MONEY, EFFORTS & PROBLEMSSAVE MONEY, EFFORTS & PROBLEMS

Do You Need To Review ?Do You Need To Review ? Why not ?Why not ?

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SPECIAL SPECIAL

DUAL PLATE CHECK VALVESDUAL PLATE CHECK VALVES

FROM ADVANCE VALVESFROM ADVANCE VALVES

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* Hundred percent leak tight

* Meets the need of high pressure

Gas , Air & Liquid application.

Softseated Softseated 600# 600#

Dual Plate Check ValvesDual Plate Check Valves

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Rubber LinedRubber LinedDual Plate Check ValvesDual Plate Check Valves

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Dual Plate Check Valves are Zero Velocity Non Slam Valves

Water Supply Manual, published by Central Govt. has recommended use of Dual Plate Check Valves to prevent Water Hammer in Pipe Lines

Indian Institute of Science, Bangalore has recommended for use of these valves in Pump houses, Rising mains and at intermediate locations along main lines

Zero Velocity ValvesZero Velocity Valves

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Dual Plate Check Valves are an economical & technically superior alternative to Multi Door and Dash Pot Fitted Swing Check Valves any where and every where.

Dual Plate Check Valve has been incorporated as separate equipment in the Surge Analysis Software package developed by Indian Institute of Science Bangalore.


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JacketJacketeded


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To meet the requirement of Oil and Chemical

Industry to pump fluids having high viscosity at

ambient temperature like Ashes, bitumen, tar etc.

To pump liquids with low vapourising

temperature or highly volatile liquids.

JacketJacketeded


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Helps maintain temperature of flowing fluids through pipes.

Prevents change of phase of highly volatile fluids and fluids with high solidification temperature.

Contra circulating flow through the jackets ensures uniform dissipation of heat through radiation.

JacketJacketeded


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Meets the requirement of gas and air

applications especially blower applications

and

also in liquid pipe lines where the normal

flow velocity is extremely low

For Low Velocity Pipe Line For Low Velocity Pipe Line ApplicationsApplications


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Caters to the needs of Large Size Pipe Lines

For

Water Management Systems

6 bar To 10 bar DPCV For Lift Irrigation

Systems Cross Country Pipe Lines

Large Water Intake in Thermal Plants

Large Size Large Size Dual Plate Check ValvesDual Plate Check Valves

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DPCV in various sizes for application in high Vacuum has

been supplied to major clients in India

Test facility for Vacuum Test at high temperature catering

to all sizes valves are available.

For example 750 mm (30”) SS 304 valves -12 Nos besides

other small sizes supplied to OCFL, Paradeep Port.

Vacuum Vacuum ServiceService


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Facility has been established for testing of valves using

inert gas like Nitrogen at rated pressures as an

alternative to Helium Leak Test.

These test procedures were witnessed and approved by

Engineers India Limited.

Valves For Explosive Valves For Explosive FluidsFluids

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Communication Co-Communication Co-ordinatesordinates

142 A & B, Noida Special Economic Zone, NOIDA - 201 305 (INDIA) Phone : +91 (120) 4796900 Fax : +91 (120) 261144 e-mail : [email protected]

Website : www.advancevalves.com

home dual plate check valves a technical presentation

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