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Watts Series 995 Installation Instructions

Installation

A. Series 995 may be installed in a horizontal or vertical flow up posi-

tion (Z995 Series). The shutoff valve with the test cock is to be
mounted on the inlet side of the backflow preventer. The test cock
is on the inlet side of the shutoff valve.

B. The 995 should always be installed in an accessible location to fa-

cilitate testing and servicing. Check the state and local codes to in-
sure that the backflow preventer is installed in compliance, such as
the proper height above the ground. The backflow preventer must be
supported and is not designed to carry full weight of the stand pipe.

C. Water discharge from the relief valve should be vented in accor-

dance with code requirements. The relief valve should never be sol-
idly piped into a drainage ditch, sewer or sump. The discharge should
be funneled through a Watts air gap fitting piped to a floor drain.

D. Watts recommends a strainer be installed ahead of Watts Series

995 assemblies to protect the discs from unnecessary fouling.

*For additional information on Watts insulated enclosures send for ES-WB of ES-WBT

Start Up

E. The downstream shutoff should be closed. Open upstream slowly, fill the

valve and bleed the air through Test cock 2, 3 and 4. When valve is
filled, open the downstream shutoff slowly and fill the water supply sys-
tem. This is necessary to avoid water hammer or shock damage.

F. The installation of a Watts air gap with the drain line terminating above a

floor drain will handle any normal discharge or nuisance spitting
through the relief valve. However, floor drain size may need to be de-
signed to prevent water damage caused by a catastrophic failure condi-
tion. Do not reduce the size of the drain line from the air gap fitting.

G. Two or more smaller size valves can be piped in parallel (when ap-

proved) to serve a large supply pipe main. This type of installation is
employed where increase capacity is needed beyond that provided by a
single valve and permits testing or servicing of an individual valve with-
out shutting down the complete line.
The number of assemblies used in parallel should be determined by the
engineer’s judgement based on the operating conditions of a specific in-
stallation.

Indoors

Above Ground

*Insulated Enclosure

Watts 995

Vertical

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12" min.

36" max.

Watts N995

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12" min.

36" max.

12" min.

36" max.

Air Gap

To Floor

Drain

Floor Drain

Relief Valve Vent

12" min.

36" max.

Watts Z995

Flow

Содержание 995 Series

Страница 1: ...IS TK 99E and IS TK 99D For troubleshooting guide send for S TSG For other repair kits and service parts send for PL RP BPD For technical assistance contact your local Watts representative on back pag...

Страница 2: ...nd cause water blockage during an emergency 5 Normal discharge and nuisance spitting are accommodated by the use of a Watts air gap fitting and a fabricated indirect waste line Floor drains of the sam...

Страница 3: ...pen upstream slowly fill the valve and bleed the air through Test cock 2 3 and 4 When valve is filled open the downstream shutoff slowly and fill the water supply sys tem This is necessary to avoid wa...

Страница 4: ...o secure cam bar Slowly pull the assembly out ward to open check allowing exposure of the seat and clapper contact area for cleaning The assembly may be locked open by aligning the holes in the cam ba...

Страница 5: ...removable 1 3 Clapper Retaining Plate Screws removable 4 4 Clapper Retainer Plate removable 1 5 Clapper Disc removable 1 6 Pivot Arm Pin removable 2 c clips 1 7 2nd Cam Check O ring removable 1 Parts...

Страница 6: ...t the elastomer in the sealing disc assembly 4 Servicing the Relief Valve COMPLETE DISASSEMBLY OF THE RELIEF VALVE 1 Remove the sealing disc as above 2 Remove the dust cover 10 from the cover weldment...

Страница 7: ...ush Start Test 7 Open VA then slowly open VB no more than 1 4 turn When relief valve drips push the hold button for 2 seconds Record reading must be 2 PSID or more Push Stop Test 8 Close VA and VB Tes...

Страница 8: ...Kits include RV Diaphragm RV Disc Lower O ring Upper O ring First Check Rubber Parts Kit 888923 RK 995 995 RPDA RC1 3 4 3 4 995 995 RPDA 888924 RK 995 995 RPDA RC1 6 6 995 995 RPDA Kits include First...

Страница 9: ...blem D B Assembly discharges from Pressure relief valve does not close See problem D differential relief valve during a flow condition C Differential pressure relief valve Differential pressure across...

Страница 10: ...nd for F TK DL No TK 7 Backflow Preventer Test Kit Tests the individual check modules of the Watts No 7 Residential Dual Check Also used to test No 709 and 007 For additional information send for IS T...

Страница 11: ...11 NOTES...

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