Watts 757 Series User Manual

Series 757, 757DCDA
Double Check Valve Assemblies
Double Check Detector Assemblies
Sizes: 2
1
⁄2" – 10" (65 – 250mm)
• 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.
757 OSY
IMPORTANT: Inquire with governing authorities for local installa-
tion requirements.
NOTE: For Australia and New Zealand: Pipeline 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 com-
pliance with local codes, but at least once per year or more as
service conditions warrant. If installed on a fire sprinkler sys-
tem, all mechanical checks, such as alarm checks and back-
flow preventers, should be flow tested and inspected internally
in accordance with NFPA 13 and NFPA 25.
RP/IS-757/757DCDA
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 shipment. 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 dam-
aged 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 product. THIS WARRANTY IS IN LIEU OF ALL OTHER WAR-
RANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MER-
CHANTABILITY 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 limitations 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.

Watts 757 Series Specifications

General

Series	757
Body Material	Bronze
Size Range	1/2" - 2"
End Connections	Threaded
Temperature Range	33°F - 150°F

Summary

CALIFORNIA PROPOSITION 65 WARNING

Limited Warranty

Basic Installation Instructions

Installation Guidelines

Provides guidance on flushing systems and acceptable installation positions (horizontal/vertical) for valve assemblies.

Maintenance Instructions

Maintenance for 2 1/2" – 6" Assemblies

Details the procedure for servicing smaller valve assemblies, including disassembly and component cleaning steps.

Maintenance for 8" – 10" Assemblies

Outlines the specific steps for maintaining larger valve assemblies, focusing on spring mechanism removal and reassembly.

Test Procedures

Testing Check Valve No. 1

Step-by-step instructions for testing the first check valve, including hose connections and pressure readings.

Testing Check Valve No. 2

Step-by-step instructions for testing the second check valve, detailing test cock usage and differential pressure checks.

Test for Leaky No. 2 Shutoff

Procedure to identify and diagnose excessive leakage at the second shutoff valve during assembly testing.

Repair Kits

1st Check Kits

Lists ordering numbers, sizes, models, and components for first check valve repair kits.

2nd Check Kits

Lists ordering numbers, sizes, models, and components for second check valve repair kits.

1st or 2nd Check Rubber Parts Kits

Details rubber parts kits for both first and second check valves, including components like O-rings and elastomers.

Check Sleeve Cover Kits

Provides information on repair kits for check sleeve covers, listing parts such as closure sleeves and gaskets.