Watts 995 Series Guida all'installazione

• Installation • Service

• Repair Kits • Maintenance

LIMITED WARRANTY:Watts Regulator Company warrants each prod-

uctagainstdefectsinmaterialandworkmanshipforaperiodofoneyear

from the date of original shipment. In the event of such defects within

thewarrantyperiod, the Companywill,atitsoption,replaceor recondi-

tion the product without charge. This shall constitute the exclusive

remedy for breach of warranty, and the Company shall not be respon-

sible for any incidental or consequential damages, includ

Series

995/995RPDA

Reduced Pressure Zone Backflow Preventer/

Reduced Pressure Detector Assemblies

Sizes: 3" - 6"

For field testing procedure, send for IS-TK-DL,

IS-TK-9A, 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 page.

N995/Z995, N995RPDA, Z995RPDA are identical in

construction to the 995/995RPDA Series, except

include short radius elbows between the backflow

preventer flange and the gate valve flange.

RP/IS-995/995RPDA

IMPORTANT: Inquire with governing authorities for

local installation requirements.

NOTE: For Australia and New Zealand, line strainers

should be installed between the upstream shutoff

valve and the inlet of the backflow preventer.

CALIFORNIA PROPOSITION 65 WARNING

WARNING: This product contains chemicals

known to the State of California to cause cancer

and birth defects or other reproductive harm.

(Installer: California law requires that this

warning be given to the consumer.)

Figure 1

Valve Size Typical Flow Rates Drain

(inches) as sized by floor Size

drain manufacturers

21⁄255 gpm 2

3 112 gpm 3

4 170 gpm 4

6 - 8 - 10 350 gpm 5

Basic Installation Instructions

Installation Note:

The flange gasket bolts for the

gate valves should be retight-

ened during installation as the

bolts may have loosened due to

storage and shipping.

Watts Series 995 Reduced Pressure Zone

Backflow Preventer

1. Backflow preventers must be installed in high-visibility locations

in order to allow for immediate notice of telltale discharge or

other malfunction. This location should also facilitate testing and

servicing and protect against freezing and vandalism.

Installation procedures must comply with all state and local

codes.

3. Installing a backflow preventer in a pit or vault is not recom-

mended. An air gap below the relief port must be maintained so

as to avoid flooding and submersion of the assembly, which may

lead to a cross connection. Watts recommends installations in-

doors or above ground in an insulated enclosure. (Send for ES-WB)

4. A strainer should be installed ahead of the backflow preventer to

protect the discs from unnecessary fouling.

CAUTION: Do not install a strainer ahead of the backflow preven-

ter on seldom-used, emergency water lines (i.e. fire sprinkler

lines). The strainer mesh could potentially become clogged with

debris present in the water and 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 same size MUST be provided in case of

excessive discharge.

6. When a Series 995 backflow preventer is installed for dead-end

service applications, discharge from the relief vent may occur due

to water supply pressure fluctuation during static no-flow condi-

tions. A spring load soft-seated check valve may be required ahead

of the backflow preventer.

7. ASSEMBLY: If the backflow preventer is disassembled during in-

stallation, it MUST be reassembled in its proper order. The gate

valve with the test cock is to mounted on the inlet side of the back-

flow preventer. The test cock must be on the inlet side of the

wedge. Failure to reassemble correctly will result in possible water

damage due to excessive discharge from the relief port/vent and

possible malfunction of the backflow preventer.

8. Prior to installation, thoroughly flush pipe line to remove any for-

eign matter.

9. START UP at Initial Installations and After Servicing: The down-

stream shutoff should be closed. Slowly open upstream shutoff

and allow the backflow preventer to fill slowly. Bleed air at each

test cock. When backflow preventer is filled, slowly open the

downstream shutoff and fill the water supply system. This is nec-

essary to avoid water hammer or shock damage.

Location and Installation Considerations

#2 Test Cock #3 Test Cock #4 Test Cock

#2 Check

Relief

Valve

Sensing

Line

#1 Check

Short Cam

Arm

Long Cam Arm

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

aaa

12" min.

36" max.

Watts N995

aaa

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

Servicing First and Second Checks

1. Slowly open all ball valves to relieve air and water pressure.

After pressure is relieved, loosen bolts on groove coupler and

remove groove coupler and cover plate from valve body.

2. Remove #1 Check Assembly. Do not use Check Arm as a

handle to unscrew the Check. Insert lid bolts in 1st check seat

ring (see fig. 1), insert a long screwdriver or pry bar between

lid bolts. Gently apply pressure against the bolts and turn seat

assembly counter clockwise moving bolts hole to hole to main-

tain turning leverage (two additional bolts will eliminate need to

move lid bolts from hole to hole). Finish unscrewing by hand

and remove through top access port. Unscrew #2 Check (turn

counter-clock wise) by placing a long screwdriver across lid

Figure 1 Figure 2

bolts inserted in holes located in the 2nd check seat ring, simi-

lar in method used to remove 1st check and applying pressure

to loosen #2 Check. Finish unscrewing by hand.

3. To clean Check, locate the Check Arm opening stud on the out

let flange of the valve assembly. Slide the Arm over the stud

with the check threads facing downward (fig. 2). Tighten 1/4"

nut on stud to 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 bar and hinge arms and inserting

a rod (fig. 4).

REMOVING CHECK ASSEMBLIES (Before servicing be sure shutoff valves are closed)

Watts Series 995/995RPDA

Check Disassembly

Please use caution when disassembling check.

The check is a spring-loaded mechanical device.

Figure 3

Press down on the check assembly

to unload the cambar from hinge

arms and roller. Then place a thin

rod or screwdriver into a mainte-

nance hole in one hinge arm.

Figure 4

Using your free hand, swing the

clapper assembly away from the

seat. Align (A) lockout holes.

Figure 5

Remove 1 c-clip from the center

pivot pin. Withdraw the center pivot

pin from the clapper and the hinge

arms. Remove the clapper

assembly from the check assembly

module. Note: You may replace

this item as an assembly or you

may replace only the disc.

Disassemble the clapper by

removing 4 screws, disc retainer

and the clapper disc. Disc may be

flipped if sealing surface is dam-

aged.

Figure 6

Before reinstallation of check assembly, thoroughly clean O-ring groove and

lubricate O-ring with F.D.A. approved lubricant.

Screwdriver or Prybar

Cover Bolts

Check

Body

Check

3", 4" & 6" RP 1st Check Assmbly

Servicing First and Second Checks

Item Part Description Qty.

1. 1st Cam-Check O-ring (removable) 1

2. Clapper Assembly (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 Table (figure 8)

Figure 8

Note: Align holes and insert

pin or small screwdriver to

hold in open position.

RELIEF VALVE SERVICE INSTRUCTIONS

1. Prior to beginning any maintenance work, shut down the water

supply to the unit.

2. The relief valve is an integral part of the lid assembly and may be

serviced when the lid assembly is removed from the body of the

valve.

3. The relief valve may be disconnected from the sensing line hose if

desired to enable easier access to all parts of the assembly.

REPLACING THE SEALING DISC

1. Unscrew the lower guide, (5) from the shaft (3).

2. Replace the sealing disc assembly (4).

3. Screw the lower guide (5) back into the shaft (3). The lower guide

will seal the assembly with pressure against 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 (1).

3. Unload the internal spring by unscrewing the guide, shaft (9) us-

ing a socket wrench.

4. Draw the shaft out through the bottom of the diaphragm.

5. Remove the spring through the top of the cover weldment.

6. Remove guide O-ring (6).

7. Remove O-ring (12) from the guide shaft.

REASSEMBLY

1. Replace all O-rings

2. Reverse disassembly steps above.

Item Part Description Qty.

1. Cover 1

2. Diaphragm/Gasket 1

3. Shaft 1

4. Sealing Disc 1

5. Guide, Lower 1

6. O-ring 1

7. Support Disc 1

8. Disc, Diaphragm Stop 1

9. Guide, Upper 1

10. Cover, Dust 1

11. O-ring, Upper 1

12. Spring 1

Parts Table (figure 9)

Figure 9

Testing - Reduced Pressure Zone Backflow Preventers

Watts TK-DP

The following Test Procedure is one of several that is recognized throughout the United

States for testing Backflow Preventers.

The following procedure is not a specific recommendation. The Watts series of test kits are

capable of performing any of the recognized Backflow test procedures.

For additional testing information send for IS-TK-DP/DL, IS-TK-9A and IS-TK-99E

A. Open TC #4 and flush test cocks Nos. 1, 2 and 3 on BF assembly,

then close TC #4.

B. Turn tester on (before connecting hoses). Tester must read all

zeros. Close VA and VB.

Test No. 1 - Relief Valve

1. Install high-side hose between TC #2 and tester connection A.

2. Install low-side hose between TC #3 and tester connection B.

3. Open TC #3 then VB. Now open TC #2 slowly, then VA. Close

VA then VB.

4. Close #2 shutoff valve.

Observe the apparent first check valve differential pressure (A - B).

6. Install bypass hose between VA and VB. Open VB and bleed air

by loosening hose connection at VA. Tighten hose connection

and close VB.

Push - Print Head (wait) then Push - Start Test

7. Open VA, then slowly open VB (no more than 1⁄4turn). 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.

Test No. 2 - Test No. 2 Check Valve

9. Install bypass hose between VA and TC #4. Open VA, then

bleed air by loosening hose connection at TC #4. Tighten hose

connection. Close VA.

Push - Start Test

10. Open VB to reestablish pressure within the “zone”. Close VB.

11. Open TC #4, then open VA. If relief valve does not drip, record

second check valve as “close tight”.

Test No. 3 - Test No. 1 Check Valve

12. Open VB to reestablish first check valve differential pressure.

Close VB. Record pressure differential.

Stop Test (Push Stop Test twice)

13. Close test cocks and remove tester, return assembly to normal

operating condition.

RPZ

Test 1

RPZ

Test 2

RPZ

Test 3

Watts 995

It is important that this device be tested periodically in compli-

ance with local codes, but at least once per year or more as ser-

vice conditions warrant. If installed on a fire sprinkler system

all mechanical checks, such as alarm checks, single checks

and backflow preventers should be inspected internally every

one to five years in accordance with NFPA 13 A and NFPA 25

995/995RPDA Repair Kits

First Check Kit

EDP No. Kit No. Size For use w/Model #'s

888915 RK 995/995 RPDA CK1 3" - 4" 3" - 4" 995/995 RPDA

888916 RK 995/995 RPDA CK1 6" 6" 995/995 RPDA

Kits include: Complete #1 Check Assembly and Check O-ring.

Second Check Kit

888917 RK 995/995 RPDA CK2 3" - 4" 3" - 4" 995/995 RPDA

888918 RK 995/995 RPDA CK2 6" 6" 995/995 RPDA

Kits include: Complete #2 Check Assembly and Check O-ring.

Relief Valve Total Kit

888919 RK 995/995 RPDA VT 3" - 4" 3" - 4" 995/995 RPDA

888920 RK 995/995 RPDA VT 6" 6" 995/995 RPDA

Kit includes: Relief Valve Assembly, Cover Plate, Diaphragm, and all relief valve components.

Relief Valve Rubber Parts Kit

888921 RK 995/995 RPDA RV 3" - 4" 3" - 4" 995/995 RPDA

888922 RK 995/995 RPDA RV 6" 6" 995/995 RPDA

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 Check Assembly O-ring, check disc, and (2) C-clips.

Second Check Rubber Parts Kit

888925 RK 995/995 RPDA RC2 3" - 4" 3" - 4" 995/995 RPDA

888926 RK 995/995 RPDA RC2 6" 6" 995/995 RPDA

Kits include: Second Check Assembly O-ring, check disc, and (2) C-clips.

Rubber Total Parts Kit

888927 RK 995/995 RPDA RT 3" - 4" 3" - 4" 995/995 RPDA

888928 RK 995/995 RPDA RT 6" 6" 995/995 RPDA

Kits include: First and Second Check Assembly O-ring, first and second check disc, (4) C-clips, RV Dia-

phragm, RV Disc, RV lower O-ring, RV Upper O-ring.

Cover Kit888929 RK 995/995 RPDA C 3" - 4" 3" - 4" 995/995 RPDA

888930 RK 995/995 RPDA C 6" 6" 995/995 RPDA

Kits include: Cover and Cover O-ring.

Air Gap Assembly

EDP No. Kit No.

439190 995AG 3" - 6"

Air Gap Assembly

Air Gap Fitting

Problem Cause Solution

A. Assembly discharges from Fouled first check Disassemble and clean No. 1

differential relief valve during check valve

no flow condition. Fluctuating inlet pressure Control supply line water pressure.

Install a spring-loaded soft seated

check valve upstream of the back-

flow prevention assembly.

Outlet pressure higher than inlet Disassemble, clean #2 check valve

pressure & leak in No. 2 check valve & identify cause of back pressure

Leak through diaphragm Service relief valve

Pressure relief valve does not close See problem 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 No. 1 Repair shutoff valves

does not open during test check valve stays above 2.0 psi

due to leaking outlet gate valve

Weak or broken relief valve spring Disassemble and replace relief

valve spring

Plugged hydraulic hose Disassemble and repair

D. Pressure relief valve Debris on sealing surface Remove relief valve and clean

does not close Plugged hydraulic hose Disassemble and clean

Damaged seat or rubber shutoff disc Remove relief valve assembly and

replace

Ruptured diaphragm Disassemble and replace diaphragm

Trouble Shooting Guide

No. TK-99D

Backflow Preventer Test Kit

Hand held digital test kit

designed to test PVB’s,

SVB’s, DCVA’s, DCDA’s, RP’s

and RPDA’s

For additional information, send

for S-TK-99D.

No. TK-9A

Backflow Preventer Test Kit

Especially made for testing all reduced

pressure zone backflow preventers. It

is easily connected to any RPZ enabling

accurate testing of “zone”and relief

valve opening differential fouled check

valves or similar problems that visual

inspections cannot locate.

Max. pressure 175 psi

Max. temperature 210°F.

Test kit contains: gauge, test valves,

hoses, adaptors, securing strap,

instruction guide and lightweight case.

For additional information,

send for IS-TK9A.

No. TK-DL

Test Kit for Backflow Prevention Products

TK-DL has Digital Print-Out and Computer

Download

An advanced piece of test equipment designed

to make pressure and differential gauges

obsolete in the testing of backflow preventers.

• Accuracy • Portability

• Versatility • Documentation

• Readability • Downloadable

Test kit contains hoses, adaptors, digital

print-out unit with complete instructions in

rugged case.

For additional information,

send 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-TK7.

No. TK-99E

Backflow Preventer Test Kit

The Watts TK-99E has been designed for

simplified operator operation and rugged

reliability in a compact package. Offering the

latest in gauge technology, the Watts TK-

99E provides dependable accuracy when

testing pressure vacuum breakers, anti-spill

vacuum breaker, reduced pressure backflow

preventers or double check assemblies.

TK-99E for RPZ, DCVA, SVB and PVB

models, accurate to ±1% of full scale.

• A large 4.5" anti-parallax dial which

indicates descending measurement,

accurate to ±1% of full scale.

• Complete kit contains gauge with color-

coded valves and hoses, hose adapter,

shock cord for easy mounting, supply

pressure gauge. All contained in a

durable carrying case with room for tools.

For additional information, send for S-TK-99E.

WATTS TEST KITS

TK-DL With computer download.

No. TK-99E Anti-parallax dial for all RPZ, DCV, PVB and SVB.

No. TK-9A Analog differential gauge for all RPZ, DCV, PVB and SVB.

No. TK-99D Digital (Delta Lite™) for all RPZ, DCV, PVB and SVB

No. TK-7 Water column sight tube for Dual check and Double check valves

Watts Backflow Preventer Test Kits

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