jay r. smith mfg. co. automatic backwater · pdf fileautomatic backwater valve ... style...

Jay R. Smith Mfg. Co.®

CUSTOMERDRIVEN

SMITH®

AutomaticBackwater

Valve

®

Automatic Backwater ValveFloodGate®

Index Page

Flood-Gate® Featuresand Applications 2

How Flood-Gate® Works 3

Flood-Gate® Operation & Approvals 4

Valve Sizes, Rough-inDimensions & Options 5

Valve Installation 6

Special Installations 7

Monitoring SystemInstallation & Operation 8

Testing Instructions 9

Specifications 10

Illustration 11

Submittal Back Cover

FLOOD-GATE® FEATURES

Completely Automatic: (both closing and resetting)The building owner does not have to activate the valve or even bepresent to ensure protection from sewage backup.

Effective Operation Without ElectricityFully mechanical - no electricity is required to activate the valve or to reset the gate after operation.

Full Port:Nothing to obstruct the flow or trap debris.

In-Line Construction:Can easily be installed in existing buildings.

Positive Seal:Once closed, it prevents leakage beyond the valve. 99.9% effective in tests with a 45 foot head of water pressure.

Cast Iron Body with Stainless Steel Knife Gate:Long life and dependability. It is designed to cut through normal debrissuch as raw sewage and paper material that would clog regular flapperstyle backwater valves.

No Resetting:Valve does not require resetting after being activated.

FLOOD-GATE® APPLICATIONS

Homes: Protect your investment from costly insurance claims.

Commercial: Basements, elevator pits, computer and electrical rooms to prevent costly downtime.

Industrial: Protect valuable machinery and equipment.

Institutional: Hospitals and schools to maintain maximum healthenvironment.

Restaurants: Helps protect against bacterial contamination.

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Properly installed, the FLOOD-GATE® will provide years of trouble-free automatic service.


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A sewerage backflow into thebuilding/house will happen if a stoppageor similar problem in the municipal/streetsewer, or septic system occurs causingthe drainage water level to rise above thetop of the building/house drain. It is underthese conditions that the Flood-Gateworks.

Once the backflow subsides andthe drainage water level returns tonormal, the counterweight atop theexpansion chamber forces the trapped airout of the chamber and into the drainageline, allowing the knife gate to lowerto a full open position. Now theFlood-Gate is ready to guard againstfuture backflow situations.

As the sewerage backflow occurs the airtrapped in the expansion chamber iscompressed by sewerage backup. Thepressure in the expansion chambercauses the knife gate to rise until the 4”or 6” drainage opening is completelysealed. This action occurs with a 9” headof drainage water for a 4” valve anda 14” for a 6” valve. When completeclosure is obtained in the valve, all back-flow is prevented from entering thebuilding or structure.

Floor drain or fixture

Flood-Gate

Access chamber


Flood-Gate

Access chamber


Flood-Gate

Access chamber

HOW THE FLOOD-GATE® WORKS. AUTOMATICALLY:

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2

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FLOOD-GATE® OPERATION AND APPROVALS

The trapped air in the expansion chambercreates an upward force on the counter-weight plate of the diaphragm.

When pressure increases beyond 6”head/water, the plate is forced upwardactivating the closing of the knife gate.

A 9” head/water (4” valve), 14”head/water (6” valve) is sufficient toraise the gate to its fully closed position.

Knife Gate open Knife Gate closing Knife Gate closes off valve

OPERATION

The FLOOD-GATE automatic back-water valve is designed to protect abuilding and its contents from damage due to a backup in the

drainage system. The FLOOD-GATEis intended for installation in thesanitary drain line connecting abuilding’s sanitary system with the

local sanitary sewer system orseptic tank. It can also be used instorm sewer applications.

OPERATION OF KNIFE GATE

Lacking any upward force, the gate is in the open position, which allows for unrestricted flow through a full port opening.

Approvals

The FLOOD-GATE Automatic Backwater Valve conforms to requirements per ASME A112.14.1 for Backwater Valves.

IAPMO Listed, File No. 3758.

The FLOOD-GATE Automatic Backwater Valve has been approved for use in the following states: Illinois, Indiana, Kentucky,Michigan, Massachusetts, Ohio, West Virginia, and Wisconsin.


FLOOD-GATE ALARM -FGA

• Alarm Control Box

• 35 ft. of Cable

• Sensor

• One (1) 9 voltbattery* and/or 120 volt A/C power plug

FLOOD-GATE PIT -FGP (Poly Pit, secured, Gasketed

Poly Lid, Hardware), 25 lbs.

-FGS (Poly Pit, secured, Gasketed

Steel Lid, Hardware), 69 lbs.

-FGSL Steel Lid Only, 42 lbs.

NOTE: All Flood-Gate Pits (are furnished with

two pipe gasket seals) - designate 4” or 6” valve.

Pit can only be located in non-traffic areas.

FLOOD-GATE® VALVE, DIMENSIONS AND OPTIONS

FLOOD-GATE VALVE7140Y04 4 in. (100 mm), 60 lbs.

7140Y06 6 in. (150 mm), 90 lbs.

Cover

Flexible PVCDiaphragm/ExpansionChamber

Stainless Steel Gate

Flood Gate Pit(When Specified)

BACKFLOWBUILDING DRAIN FLOW

Top of Pit

Valve Stem

2” (51 mm) (Top of Cover)

Neoprene Pipe Seal (2)

See back cover fordimensions

OPTIONS

U.S. Patent No. 5,538,032Other U.S. and foreign patents pending

*9 volt battery not included

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FLOOD-GATE® VALVE INSTALLATION: 4 INCH (7140Y04) & 6 INCH (7140Y06)

CRITICAL INSTALLATIONDATA:The installer must abide by one criticalMINIMUM dimension. This is the dis-tance from the top of the horizontaldrain line, where the FLOOD-GATE isinstalled, to the top of basement floordrain. (See FLOOD-GATE ValveTesting Instructions Illustration forminimum bury depth on page 8.) Anadditional two (2) inches more thanthis minimum is suggested, so that thetop of the valve cover will be situated2” below the pit cover. The FLOOD-GATE valve must have a stable supportblock between the base of the valveand the bottom of the pit. The optionalFLOOD-GATE pit, page 4, is regularlyfurnished with an integral supportblock.

FACTORY TESTED:

The FLOOD-GATE VALVE must beproperly installed with the properdirection of flow (as indicated by thearrows on the valve) to ensure properfunctioning. Each FLOOD-GATE valvehas been thoroughly inspected andtested at the factory. If the valve isdamaged during shipment, or if anyservice to the valve is necessary,return the complete valve to the factoryfor repair or replacement. DO NOTattempt to disassemble or repair theFLOOD-GATE in the field.

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View looking into pit with Flood-Gateand cleanout

View of Flood-Gate in plastic pit withgravel bottom

The Flood-Gate is installed in a 20-foot deep concrete pit protecting thethree branch lines into a church’snursery and overall environment.

The FLOOD-GATE automatic backwatervalve is designed to protect a buildingand its contents from flood damagedue to a backup in the sanitary sewersystem and can also be used in stormsewer applications. Properly installed,the FLOOD-GATE will provide years oftrouble-free automatic service.Depending on individual circumstances,one of the two following installationguidelines must be followed:

OPTION ONE:The FLOOD-GATE must beinstalled in a ventilated and dryaccess pit in the horizontaldrain line between the buildingand the sewer main (a sealed orflooded pit will restrict the freemovement of the valve).Although this provides completeprotection from flooding, all ofthe plumbing fixtures in thebuilding will be out of serviceonce the FLOOD-GATE is acti-vated. In this type installation,the optional alarm system ishighly recommended.

OPTION TWO:

Another installation, sometimespreferred, locates the FLOOD-GATE where only the fixturesinstalled below grade (as in abasement) are connected on theupstream side of the valve. Allfixtures installed above gradeare connected on the down-stream (sewer) side of thevalve. This allows continued useof the above grade fixtures,while protecting below gradeareas from flooding.


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FLOOD-GATE® SYSTEM SPECIAL INSTALLATIONS

Building (House)Sewer (by others)

Floor Slab(by others)

Flood-Gate Pit(-FGP or -FGS)

Jay R. Smith Mfg. Co.® Flood-Gate Series 7140in-line Backwater Valveand Pit.

Sanitary (City)Sewer (by others)

Submersible SeweragePump (by others)

Gas & WatertightPit (by others)

Pit Vent(by others)

Union (by others)

Check Valve(by others)

Building Wall(by others)

Discharge Piping(by others)

Building Flow



Submersible Sewerage Pump (by others)

Overflow Piping(by others)

Enclosed WatertightSump (by others)

Pit Vent(by others)

Building Flow

90° Elbow(by others)

Union (by others)

Check Valve(by others)

Discharge Piping(by others)

Connect pump discharge aheadof Flood-Gate BWV in the buildingsewer or discharge elsewhere per code.

Flood-Gate Pit (-FGP or -FGS)

Jay R. Smith Mfg. Co.Flood-Gate Series7140 in-line AuotomaticBackwater Valve and Pit.

Detail - in-line backwater valve and sewage pump

Detail - in-line backwater valve with emergency sewage pump


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FLOOD-GATE

FLOW

FLOW

IN OUT

Minimum DepthX

Building Drain

To Public Sewer

Test Ball

Garden HoseWall

Main Cleanout

Basement Floor Level

Valve Stem

Integral Valve Support BlockPre Fab Access Pit

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FLOOD-GATE® TESTING INSTRUCTIONS AND ILLUSTRATIONS

NOTE: X = The dimension from the top of the horizontal drain line to the top of basement floor drain.

IMPORTANT: THIS PROCEDUREMUST BE FOLLOWED AFTERTHE INITIAL INSTALLATION.

1. Place a “Test Ball” through the maincleanout into the horizontal drainline and inflate it.

2. With an ordinary garden hose, runwater into the building drainthrough the cleanout opening (thiswill simulate a backup of the mainsewer).

3. Watch the round opening in the topof the FLOOD-GATE VALVE cover.You should see the end of the valvestem rise as the valve closes. Fullclosure should occur before thewater in the cleanout openingreaches floor level. This means thevalve is closing properly.

4. Deflate the “Test Ball.” This willallow the drain to open and youshould be able to see the valvestem drop; returning to its normalopen position.

NOTE: It is important to test theFLOOD-GATE after longperiods of inactivity to assurereadiness. Follow theseinstructions to test for properoperation.

MINIMUM BURY DEPTH

7140Y04 X= 9 inches 7140Y06 X=14 inches


FLOOD-GATE® SPECIFICATIONS

Application

Backwater Valve for gravity sanitarydrainage system connected to munici-pal sanitary sewers or septic tanks.

Material SpecificationsThe assembly comprises numerousparts. The following is a briefdescription of the main components.

1. Gate - Manufactured fromstainless steel type 304 withfull port opening and integralclosing stopper.

2. Body - Two cast iron halves,designed to bolt together toenclose gate. Cast iron shall beClass 25 to ASTM A48. Bothsections are equipped withbarrels suitable for mechanicalcoupling to upstream anddownstream sections of pipe.Out (or downstream) fittingequipped with full port open-ing. Each half incorporates acontinuous groove around thecircumference of the openingto accept an O-ring. TheseO-rings act to seal againstthe gate.

3. Spacer - Stainless steelgasket placed between thetwo body halves to permit the (thinner) gate to slide withinthe two halves of the body.

4. Expansion chamber - FlexiblePVC diaphragm.

5. Counterweight Plate, PlateWeight Holder, and Rod -Counterweight Plate is affixedto the top of the expansionchamber using a threaded rodequipped with nuts. The nutscompress the top surface ofthe expansion chamberbetween the counterweightplate on top and the plateweight holder on the bottom.The rod is connected to the topof the gate. Expansion cham-ber Counterweight Plate ismade of cast iron.

6. Clamping Ring - Clamps thebottom skirt of the expansion

chamber to the circumferenceof the body, forming a water-tight seal. This seal preventswaste water which enters theexpansion chamber throughthe downstream port undersurcharge conditions fromleaking out of the expansionchamber.

7. Cover - Polyethylene cylinderwhich is positioned over theexpansion chamber to protectit and constrain its expansionunder surcharge conditions.

8. Maintenance Handle - Teeshaped handle used to attachto stem in center of counterweight plate to exercise valveduring annual maintenance.

5. Counterweight Plate and Rod

7. Cover

2. Body1. Stainless Steel Gate

4. Flexible PVCExpansion Chamber

3. Spacer

6. ClamplingRing

8. Maintenance Handle

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FLOOD-GATE® ILLUSTRATION

CounterweightPlate and Rod

Flexible PVCExpansionChamber

ClampingRing

StainlessSteel Gate

Cover

Body

Spacer

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JAY R.SMITH MFG. CO.DIVISION OF SMITH INDUSTRIES, INC.POST OFFICE BOX 3237MONTGOMERY, ALABAMA 36109-0237 (USA)TEL: 334-277-8520 FAX: 334-272-7396 www.jrsmith.comCUSTOMER

DRIVEN

SMITH®MEMBER OF:

SANITARY

ENGINEERINGPrevention Rather Than Cure

SPM021602/08

®

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