Feb 850 series User manual

Installation Instructions

1. Consult local codes for specific installation requirements and restrictions

applicable to your area. It is recommended that system supply pressure

be at least 20psi (133kPa).

2. These instructions apply to Series 850 (DC) and 856 (DCDA), sizes 21⁄2"

to 10" only (65 – 250mm). The valves may be installed only in the orienta-

tion/flow direction as shown. The gate valves may be rotated as permit-

ted by the flange bolt pattern on vertical installations only.

3. The valve assembly must be installed where it is accessible for periodic

testing and maintenance. Clearances shown in the installation views

apply to exterior, interior and pit/vault installations and are only recom-

mendations. These minimums do not apply to removable protective

enclosures. Refer to local codes for actual requirements in your area.

4. PRIOR TO INSTALLING THE VALVE INTO THE LINE, FLUSH THE SUPPLY

LINE OF ALL FOREIGN MATERIAL. Failure to flush the supply line may

cause the check valves to become fouled and require disassembly and

cleaning.

5. Lift the assembly by connecting lift hooks to the lift rings cast into the

valve body. DO NOT LIFT THE ASSEMBLY BY CONNECTING TO THE

GATE VALVE HANDWHEELS OR STEMS.

6. After installation SLOWLY fill the assembly with water and bleed air from

the body using the # 3 and # 4 test cocks. Test the valve assembly to

ensure correct operation.

NOTE: All assemblies are tested at the factory for proper operation and

leakage. If the valve does not pass the field test, it is most likely due to a

fouled check valve. This is not covered by the factory warranty. The valve

cover(s) must be removed and the check seats inspected and cleaned.

Any damage or improper operation caused by pipeline debris or improp-

er installation/start-up is not included in the factory warranty.

In case of a possible warranty claim, contact your local supplier or

FEBCO Representative. DO NOT REMOVE THE VALVE ASSEMBLY

FROM THE PIPELINE.

7. The assembly must be protected from freezing and excessive pressure

increases. Thermal expansion or water hammer can cause pressure

increases. These excessive pressure situations must be eliminated to

protect the valve and system from possible damage.

Typical Installation

Figure 1

Figure 2

Figure 3

IS-F-850/856-DC/DCDA

INSTALLATION INSTRUCTIONS

Series 850, 856

Double Check Valve Assemblies

Double Check Detector Assemblies

Sizes: 21⁄2" – 10" (65 – 250mm)

RWWP

FRT

4175

850

12" Min (300mm)

Refer to Local Codes

6" Min (150mm)

Refer to Local Codes

Flow

HORIZONTAL INSTALLATION OR THE DC SERIES 850

(Front View, Shown With Strainer)

6" Min (150mm)

Refer to Local Codes

18" Min (450mm)

HORIZONTAL INSTALLATION OR THE DC SERIES 850

(Top View, Shown With Strainer)

6" Min (150mm)

Refer to Local Codes

18" Min (450mm)

VERTICAL INSTALLATION OR THE DC SERIES 850

(Shown With Strainer)

Flow

MAINTENANCE MANUAL

Limited Warranty: FEBCO 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 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 product. 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 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.

General

1. Detailed maintenance manuals are available from your local FEBCO

representitive.

2. Rinse all parts with clean water prior to reassembly.

3. DO NOT USE ANY PIPE DOPE, OIL, GREASE OR SOLVENT ON ANY

PARTS unless instructed to do so.

4. Do not force parts. Parts should fit together freely. Excess force may

cause damage and render the assembly inoperable.

5. Carefully inspect seals and seating surfaces for debris or damage.

6. After servicing, repressurize the assembly and test to ensure proper

operation.

Disassembling the Check Valve

1. Close the outlet shutoff valve, then close the inlet shutoff valve. Bleed

residual pressure from the assembly by opening the #4, #3, and # 2

test cocks in this sequence.

2. Remove the cover bolts/nuts and lift the cover from the body. The

springs are retained and the cover should be pushed away from the

body approximately 1⁄4inch.

3. Inspect/clean debris from the disc and seat ring. Replace worn or

damaged parts as required.

4. Replace the cover, ensure the spring assembly is positioned in the pivot

socket. If necessary, apply FDA approved grease to the O-ring groove in

the body to keep the O-ring in position while installing the cover.

5. Install the bolts and nuts and tighten.

Test Procedure

FEBCO recommends the use of the appropriate test method presented in

the ASSE Series 5000 manual that is consistent with your local codes.

Troubleshooting for Double Check Assemblies

PROBLEM CAUSE SOLUTION

1. Check valve leaking a. Debris on seating surface Disassemble and clean

b. Leaking shutoff valve. Disassemble and clean

2. Low flows a. Mainline check fouled Disassemble and clean

passing through b. Bypass line plugged Disassemble and clean

Servicing Check Valve Assemblies

A Division of Watts Water Technologies, Inc. USA: 4381 N. Brawley • Ste. 102 • Fresno, CA • 93722 • Tel. (559) 441-5300 • Fax: (559) 441-5301 • www.FEBCOonline.com