Servicing First & Second Check Valves
WARNING
!
Depressurize valve before servicing.
No special tools are required to service the Series 919 and LF919
1
⁄
4
" - 2" (8 – 50mm).
Before servicing, make sure the water is turned off or shutoff valves
are closed.
1.
Close shutoff valves up and downstream of the valve.
2.
Using an appropriately sized wrench, loosen the check valve
cover. Unscrew the check valve cover and lift it off.
3.
Remove the spring.
4.
Lift out the disc holder assembly from the body of the valve.
5.
To reverse the seat disc, unscrew the disc screw and disassemble
the disc washer and disc rubber from the disc holder assembly.
Reverse the disc rubber so the opposite face is showing.
6.
Assemble the disc screw through the disc washer and disc rub-
ber, and screw it into the disc holder.
7.
To replace the seat module, pull the seat module out of the body
by gripping at the reinforcement ring. Replace the seat module
with the new seat by placing it into the body seat bore.
Check Disc Washer
Check Disc Screw
Check Seat
Check Seat
O-ring
Cover
Cover O-ring
Check Spring
Check Disc Rubber
Check Disc Holder
Check Assembly
RP-IS-919 1318
EDP# 1915346
© 2013 Watts
USA:
Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada:
Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
Limited Warranty:
Watts Regulator Co. (the “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.
THE WARRANTy SET FORTH HEREiN iS GiVEN EXpRESSLy AND iS THE ONLy WARRANTy GiVEN By THE COMpANy WiTH RESpECT TO THE pRODuCT. THE COMpANy MAKES NO OTHER
WARRANTiES, EXpRESS OR iMpLiED. THE COMpANy HEREBy SpECiFiCALLy DiSCLAiMS ALL OTHER WARRANTiES, EXpRESS OR iMpLiED, iNCLuDiNG BuT NOT LiMiTED TO THE iMpLiED
WARRANTiES OF MERCHANTABiLiTy AND FiTNESS FOR A pARTiCuLAR puRpOSE.
The remedy described in the first paragraph of this warranty 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, improper installation or improper maintenance or alteration of the product.
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.
SO FAR AS iS CONSiSTENT WiTH AppLiCABLE STATE LAW, ANy iMpLiED WARRANTiES THAT MAy NOT BE DiSCLAiMED, iNCLuDiNG THE iMpLiED WARRANTiES OF
MERCHANTABiLiTy AND FiTNESS FOR A pARTiCuLAR puRpOSE, ARE LiMiTED iN DuRATiON TO ONE yEAR FROM THE DATE OF ORiGiNAL SHipMENT.
A Watts Water Technologies Company
WARNiNG:
This product contains chemicals known to the
State of California to cause cancer and birth defects or
other reproductive harm.
For more information: www.watts.com/prop65
Troubleshooting Guide
Problem
Cause
Solution
1. Check valve fails to hold
1.0 PSID minimum
a. Debris on check disc
sealing surface
Disassemble and clean
b. Leaking gate valve
Disassemble and clean
or repair
c. Damaged seat disc or
seat o-ring
Disassemble and replace
d. Damaged guide holding
check open
Disassemble and clean or
replace
e. Weak or broken spring
Disassemble and replace
spring
2. Chatter during flow
conditions
a. Worn, damaged or
defective guide
Disassemble and repair
or replace guide
3. Low flows passing
through mainline valve
a. Mainline check fouled
Disassemble and clean
b. Meter strainer plugged
Disassemble and clean
c. Damaged mainline seat
disc or seat
Disassemble and replace
d. Broken mainline spring
Disassemble and replace
NOTICE
When you tighten the cover in Step 12, the cover will engage the
seat module properly.
8.
Insert the disc holder assembly back into the seat module.
9.
Replace the spring ensuring that it seats properly on the disc
holder.
WARNING
!
The first check valve has a heavy weight spring. The second check
valve has a lighter weight spring. When reassembling the check
valves, make sure you install the correct spring into the correct
check valve.
10.
Place the cover onto the spring with the internal guide on the
cover positioned inside the end coil.
11.
Screw the cover onto the valve body.
12.
Tighten the cover using the appropriately sized wrench.
13.
Service the second check valve using Steps 2 through 12.
14.
Slowly open shutoff valves.
For repair kits and parts, refer to Backflow Prevention
Products Repair Kits & Service Parts price list PL-RP-BPD.
www.watts.com
