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Installation Guidelines
These instructions apply to Series 850 and LF850 Small double
check valve assemblies only. Each series consists of two indepen-
dently operating, spring-loaded check valves. The pressure drop
across the first check valve is approximately 1.0 psig with no flow.
The pressure drop across the second check valve is also 1.0 psig
with no flow. The assembly series includes two shutoff valves and
four test cocks.
1. Install the valve only in the orientation/flow direction indicated by
the arrow on the valve body.
2. Install the valve assembly where it is accessible for periodic
testing and maintenance. (The recommended clearances shown
in the installation views apply to the exterior, interior, and pit/vault
installations. These minimums do not apply to removable
protective enclosures.)
3. BEFORE 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.
4. After installation, SLOWLY fill the assembly with water and bleed
air from the body using test cocks No. 3 and No. 4. Test the valve
assembly to ensure correct operation.
All assemblies are tested at the factory for proper operation and
leakage. If the valve does not pass the field test, a fouled check
valve is the most likely cause. This is not covered by the factory
warranty. The valve cover must be removed and the check seats
inspected and cleaned. Any damage or improper operation caused
by pipeline debris or improper installation/startup 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.
5. Protect the assembly from freezing and excessive pressure increases.
Pressure increases can be caused by thermal expansion or water
hammer. Eliminate these excessive pressure situations to protect
the valve and system from possible damage.
6. Use the plastic test cock plugs and tethers provided, as necessary.
2
Figure 1
12" Min
Horizontal Installation
Figure 2
Flow
Horizontal Installation (Top View)
850, LF850
Figure 3
Vertical Flow Up Installation
12" Min
to fixed structure
Flow
850, LF850
3" Min
18" Min
850, 850U
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