MasterSeries 850 In-Line design double check valve assembly backflow preventers are designed to prevent the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. They feature an epoxy coated ductile iron body and NRS resilient wedge gate valves. Optional OSY RW gate valves are available. Maximum working pressure is 175 psi (12.1 bar).
Literature
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Select options below to identify the UPC, Order Code, and Repair Kit for a specific 850 Large
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| Model | Product Used On - Series or Model | Kit Contents |
|---|---|---|
|
FRK 850/856/870/876-RT 4
Complete Rubber Parts Kit |
</br>850, 856, 870, 876</br> |
2 Seat Discs, 2 Seat Gaskets, 2 Cover O-rings, 2 Cover Bushings, Cover Plate Gasket and O-ring, 4 Bulk Head Gaskets</br> |
|
FRK 850/856/870V/876V-D 4
Disc Kit |
</br>850, 856, 870V, 876V</br> |
Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br> |
|
FRK 850/856/870V/880V-BFB
Bulkhead Fitting Kit |
</br>850, 856, 870V, 880V</br> |
Bulk Head Fitting, Gasket, Nut</br> |
|
FRK 850/860-C-T 4
Cover Kit |
</br>850, 856, 860, 870, 880</br> |
Cover, Expansion Pin, Socket Bearing, O-ring</br> |
|
FRK 850/870V SM2 4
Check Module Kit-Outlet |
</br>850, 870V</br> |
Spring Assembly, Load Pin, 2 Retainer Clips, Cover O-ring</br> |
|
FRK 850/870V-CK4 4
Check Kit |
</br>850, 870V</br> |
Seat Ring and Arm Assembly, Seat Gasket, Check Disc Assembly, Spring Assembly, Load Pin, 2 Retainer Clips, Cover O-ring Cover Bushing, 4 Nuts</br> |
|
FRK 850/856/870V/876V-D 8-10
Disc Kit |
</br>850, 856, 807V, 876V</br> |
10 IN Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br> |
|
FRK 850/856/860 D 2 1/2-3
Disc Kit |
</br>850, 856, 860</br> |
Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br> |
|
FRK 850/856/870V/876V-D 6
Disc Kit |
</br>850, 856, 807V, 876V</br> |
Seat Disc Assembly, Cover O-ring, Nut, Washer, Lube</br> |
Approval/Certification Information
For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. Some certification agencies allow you to search by product name and brand.