Dual Plate Check Valve

DUAL PLATE CHECK VALVES A TECHNICAL PRESENTATION

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Function Of Check Valve “ 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 WHAT YOU DO NOT WANT: Functions

• 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 Home

Types Of Check Valves • 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 Valve (As Per API 594)

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Conventional Swing Check Valve

WEIGHT OF DISC WHICH MAKES IT WORK ALSO BREAKS IT Home

Dual Plate Check Valve

Valve opening & closing is a function of velocity

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Dual Plate Check Valve Flow Velocity Vs Time Graph

Valve remains fully open for flow velocity above V min. Home


Lower Pressure Drop

F = 0.75(Spring Force) + F (Friction of Hinge) B 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. VISUALISE PRESENT TIME DOORS WITH SIDE HINGES AND OLD TIME TOP HINGED DOORS

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Head Loss v/s Flow Rate

ABOVE DATA IS SIMULATED & VALIDATED Home

Dual Plate Check Valve 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. Home

Flexible Installation Horizontal No Valve Support Vertical No Pipe Rerouting No Valve Support

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Spring Design Basis

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. Home

Dual Plate Wafer Check Valve Upside-down Installation

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Advantages At A Glance

Dual Plate Check Valve V/S Swing Check Valve SWING CHECK VALVE

DUAL 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.

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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.

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• • • •

• • •

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.

Dual Plate Check Valve -

Design

Advantages

• 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 valveinduced 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. Home

Dual Plate Check Valve Analysis

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Structural

Check Valve Economics (OVER 10 YEARS) Capital

Running

Cost

Cost

O/M

Replacement Cost

Cost SWING CHECK VALVE -> With non-slam fitments

1. 25

-> Standard

1

DUAL PLATE CHECK

0.7

<1

<1

<1

1

1

1

0.4

0.1

0.1

0.5

0.1

0.15

VALVE NOZZLE CHECK VALVE

1.6

(Based on unit cost for swing check valve) Home

Global Scene On Check Valves •

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

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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.

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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.

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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.

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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 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 Home


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750mm CLASS 150 (Wafer flanged) Home

Flow Through Dual Plate Check Valve

Crack Opening

Flow thru Center Home

Do You Need To Review ? Why not ? All the technological factors & economic advantages lead to unanimous decision.

USE DUAL PLATE CHECK VALVES FOR ADVANTAGE TO ALL TREND IS GLOBAL: WITH ISO 9001 ACCREDITATION WE, TOO, ARE READY TO PARTICIPATE GLOBALLY

SAVE MONEY, EFFORTS & PROBLEMS

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SPECIAL DUAL PLATE CHECK VALVES FROM ADVANCE VALVES

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Dual Plate Check V

Softseated 600# *

Hundred percent leak tight

*

Meets the need of high pressure Gas , Air & Liquid application.

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Dual Plate Check V

Rubber Lined

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Zero Velocity Valves 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 Home

Dual Plate Check V

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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Dual Plate Check V

Jacket ed

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Dual Plate Check V

Jacket ed 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.

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Dual Plate Check V

Jacket ed 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.

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Dual Plate Check V

For Low Velocity Pipe Line Applications 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

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Dual Plate Check V

Large Size 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 Home

Dual Plate Check V

Vacuum Service 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.

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Valves For Explosive Fluids 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.

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Communication Coordinates 142 A & B, Noida Special Economic Zone, NOIDA - 201 305 (INDIA) Phone : +91 (120) 4796900 Fax : +91 (120) 4796948 e-mail : [email protected] Website :

www.advancevalves.com

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Dual Plate Check Valve

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