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Series 919

Reduced Pressure Zone Assemblies

Sizes: 

1

4

" – 2" (8 – 50mm)

Watts 919QT

RP/IS-919

Limited Warranty:

Watts Regulator Company warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original ship-

ment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge. This shall constitute the sole and exclusive remedy for
breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other
property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water
conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication or improper installation of the prod-
uct.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Any implied warranties that are imposed by law are limited in duration to one year.

Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limi-
tations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine
your rights.

• Installation

• Service

• Repair Kits

• Maintenance

For field testing procedure, send for IS-TK-DL, IS-TK-9A, 
IS-TK-99E and IS-TK-99D.

For other repair kits and service parts, send for PL-RP-BPD.

For technical assistance, contact your local Watts 
representative on back page. 

IMPORTANT:

Inquire with governing authorities for local installa-

tion requirements.

NOTE:

For Australia and New Zealand, line strainers should be

installed between the upstream shutoff valve and the inlet of the
backflow preventer.

Its important that this assembly be tested periodically in compli-
ance with local codes, but at least once per year or more as serv-
ice conditions warrant. If installed on a fire sprinkler system, all
mechanical checks, such as alarm checks and backflow preven-
ters, should be flow tested and inspected internally in accordance
with NFPA 13 and NFPA 25.

Содержание 919 Series

Страница 1: ...HANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Any implied warranties that are imposed by law are limited in duration to one year Some States do not allow limitations on how long an implied warranty lasts and some States do not allow the exclusion or limitation of incidental or consequential damages Therefore the above limi tations may not apply to you This Limited Warranty gives you specific leg...

Страница 2: ... system or sump 2 Do not install the Series 919 in any location where any part of the unit could become submerged in standing water Parallel Installation For parallel installations you can install two or more small sized Series 919 s when approved to serve a large supply pipe main You can use this type of installation in an application where increased capacity beyond that provided by a single valv...

Страница 3: ... when 1 the first check valve is fouled or 2 the inlet pressure to the check valve drops sufficiently due to upstream pres sure fluctuations This then affects the required operating differential between the inlet pressure and the reduced pressure zone or 3 the second check is fouled during emergency backflow or resulting from a water hammer condition For troubleshooting guide send for literature S...

Страница 4: ...eat back into the chamber bore 13 Slide the diaphragm assembly into the relief valve seat 14 Place the spring on to the diaphragm assembly 15 Place the cover O ring on the diaphragm assembly 16 Line up the grooves on the relief valve cover with the grooves in the relief valve body and turn the cover clockwise 1 4 turn to seat the cover 17 Using a wrench place the bolts back into the cover and tigh...

Страница 5: ...ghten the cover using the appropriate sized wrench 13 Service the second check valve using Steps 2 through 12 14 Slowly open shutoff valves ORDER CODE KIT NO SIZE in mm 1st Check Kits 0888110 RK 919 CK1 1 4 1 2 8 15 0888111 RK 919 CK1 3 4 20 0888112 RK 919 CK1 1 25 0888113 RK 919 CK1 11 4 11 2 32 40 0888114 RK 919 CK1 2 50 Kit consists of Check Assembly Spring and Cover O ring 2nd Check Kits 08881...

Страница 6: ... shutoff 2 for tightness Requirements After passing Test No 1 continue to Test No 2 by closing test cock 2 The indicated pressure differential will decrease slightly If pressure differential continues to decrease approaching zero shutoff 2 is reported to be leaking Test No 3 Purpose To test Check Valve No 1 for tightness Requirements Valve must be tight against reverse flow under all pressure diff...

Страница 7: ...7 NOTES ...

Страница 8: ...06 USA 815 Chestnut St No Andover MA 01845 6098 www watts com Canada 5435 North Service Rd Burlington ONT L7L 5H7 www wattscanada ca W a t e r S a f e t y F l o w C o n t r o l P r o d u c t s For additional information visit our web site at www watts com ...

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