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7

MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2

1

⁄

2

"- 10" (65 – 250mm)

Repair Parts  850 / 856

2

1

⁄

2

" – 10" (65 – 250mm) Double Check / Double Check Detector Assemblies

  item DeSCription 

Style 

Size 

2

1

⁄

2

" & 3" (65 – 80mm) 

4" (100mm) 

6" (150mm) 

8" & 10" (200 – 250)

  DISC ASSEMBLY 

N-Shape 

Part # 

905182 

905153 

905154 

905155

  Items 6, 16, 17 

Only

  SINGLE SPRING MODULE  

850 

Part # 

905142 

905143 

905144 

905145

  Items 5.1, 7, 8, 9, 9.1, 

  10, 11, 12, 12.1 

856 

Part # 

905147 

905148 

905149 

905150

  CHECK REPLACEMENT KIT  

850 

Part # 

905527 

905534 

905537 

905539

  Items 2.1, and 3 - 17

   

856 

Part # 

905529 

905536 

905538 

905541

  SEAT RING / ARM ASSEMBLY  

ALL 

Part # 

905157 

905158 

905159 

905160

  Items 3, 3.1, 3.2, 3.4, 4, 4.1, 4.2, 5

  RUBBER PARTS KIT 

ALL 

Part # 

905249 

905163 

905164 

905165

  Items 2.1, 3.1, 6, 15, 26, 

  35, 35.1, 45, 45.1

  COVER ASSEMBLY  

With Bulkhead  Part # 

905167 

905168 

905169 

905170

  Items 2, 2.1, 15 

Fitting 

 

 

 

 

   

 TAPPED 

Part # 

905376 

905377 

905378 

905379

  BULKHEAD FITTING FOR COVER*  

850 

Part # 

905275 

905277

  Items 43.1, 45.1, 46.1, 47.1

   

856 

Part # 

905275 

905277

  BULKHEAD FITTING FOR BODY*  

850 

Part # 

905276 

905277

  Items 43, 45, 46, 47

   

856 

Part # 

905277

* Bulkhead fittings are not furnished on late models . Very early productions of Series 856 may require a different bulkhead fitting . Consult your FEBCO 

representative for assistance .

Second Check

First Check

test 

Cock 

#3

test 

Cock 

#4

test 

Cock 

#1

test 

Cock 

#2

test 

Cock 

#2

test 

Cock 

#1

#1 inlet Shutoff Valve

#2 outlet Shutoff Valve

Содержание 856

Страница 1: ...ing this equipment Table of Contents Features and Operating Procedures 2 How to Order Parts 2 Trouble Shooting Guide 3 Vandalism 3 Testing 3 Freeze Protection Procedures 4 General Service Procedures 4...

Страница 2: ...led in the vertical orientation must include vertical support under the second check body section Double Check Detector Assemblies Bypass Operation All low flow demands up to a minimum of three GPM ar...

Страница 3: ...rrectly The assembly should be tested at time of ini tial installation after servicing or maintenance and at least annually there after Acceptable test procedures are published by Foundation for Cross...

Страница 4: ...check module until all water inside valve drains back out through inlet drain 7 If you blowout the piping downstream of the backflow assembly using compressed air Connect the air supply to the outlet...

Страница 5: ...g to help hold O ring in place during reassembly Series 870V and 876V Apply a thin coating of the lubricant supplied in the repair kit to the O ring groove in the 2 check body and position the O ring...

Страница 6: ...eck disc stem threads Lift the arm and remove the check disc Item 6 Inspect sealing surface for debris or damage Replace check disc if necessary NOTE When jam nut Item 16 is tight check disc is design...

Страница 7: ...7 905158 905159 905160 Items 3 3 1 3 2 3 4 4 4 1 4 2 5 RUBBER PARTS KIT ALL Part 905249 905163 905164 905165 Items 2 1 3 1 6 15 26 35 35 1 45 45 1 COVER ASSEMBLY With Bulkhead Part 905167 905168 90516...

Страница 8: ...26 35 35 1 45 45 1 COVER ASSEMBLY Inlet Check ALL Part 905167 905168 905169 905170 905171 Items 2 2 1 15 COVER ASSEMBLY Outlet Check ALL Part 905244 905245 905246 905247 905248 Items 2 2 1 15 BULKHEA...

Страница 9: ...ammer or other causes of excessive water pressure Seat discs damaged in such a manner should be replaced and not turned over to be reused 3 Check Seat Ring Replacement a The seat rings are threaded in...

Страница 10: ...Nitrile 11 Washer Stainless Steel 12 Screw Stainless Steel 13 Spring Stainless Steel 30 Test Cock Bronze 35 Seat Ring Bronze 36 O ring Buna N 40 Ball Valve Bronze 40 1 Ball Valve Bronze 40 2 Ball Val...

Страница 11: ...ead loss Cast ductile iron bodies for lighter weight Lowest installed cost Saves on labor and material Choice of cost saving N Shape designs revolutionary vertical designs or conventional in line desi...

Страница 12: ...e 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...

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