Flomatic FC20 Installation Manual
Flow Controller Installation Instructions
Model FC20 ¼” & ⅜”
Description:
The FC20 Flow Control Valve is an all stainless steel spring-loaded needle type check valve. The flow rate is
unrestricted flow in one direction and restricted or metered flow in the other. The flow rate is only adjustable in the
restricted direction. It is to be used with automatic control valve pilot control systems.
Operation:
The FC20 Flow Control Valve permits full flow in the direction of the body marking arrow and restricted flow in the
reverse direction. Flow from inlet to outlet lifts the seat disc off of the seat thus allowing full flow. Flow in the opposite
direction causes the seat disc to seal, allowing fluid to pass thru the adjustable opening between the needle and seat
disc. Adjusting the needle counterclockwise increases the opening between the needle and the seat allowing more flow.
Adjusting the needle clockwise decreases the opening between the needle and the seat reducing flow.
Installation:
Installation must be performed by qualified, licensed personnel only.
The FC20 Flow Control Valve should be installed as shown in the piping schematic that came with your control valve.
Make sure all connections are tight to prevent leakage or damage to your valve.
Adjustment Procedure:
Loosen the adjustment needle jamb nut. Turning the needle out (counter-clockwise) increases the opening between the
needle and the seat disc, which increases the flow. Turning the needle in (clockwise) reduces the opening between the
needle and the seat disc, which reduces the flow. After adjustment is complete retighten the adjustment needle jamb
nut.
MAINTENANCE & REPAIR
Annual inspection and maintenance is required of all plumbing system components. To ensure proper performance and
maximum life, the FC20 must be inspected, tested and cleaned on a regular basis. Disassemble the valve according to
the exploded diagram. Inspect all threads for signs of damage or cross-threading. Make sure the seat disc and seat of
valve body do not show wear, damage or foreign material which can stop the valve from opening or seating correctly.
The spring should be checked for cracks, damage or distortion. The adjustment needle should be free from nicks or burs
which can stop the valve from opening. Inspect all parts for damage, wear and corrosion. Replace all damaged
components and items that appear would keep the valve from functioning correctly. The o-ring and cover seal should be
replaced whenever the FV20 is serviced. Make sure to clean all parts before you reassemble the valve. Re-assemble
the valve according to the cross sectional view.
TEST PROCEDURE
The FC20 Speed Control Valve does not require testing before being re-installed.
Danfoss Flomatic
B
A
FREE FLOW IN DIRECTION OF ARROW
Danfoss Flomatic Corp, 15 Pruyn’s Island, Glens Falls, New York 12801
Phone: 518-761-9797 Fax: 518-761-9798 www.flomatic.com
FC20
Rev. 4
Flow Controller Installation Instructions
Model FC20 ¼” & ⅜”
inch
1/4
3/8
Size
mm
10
Part #
AB
inch
2.20 2.1556 1 .454
Weight
mminchmm
lbs kg
.45412.15562.20855
55
Item #
Qty
11
2
1
3
1
4
1
5
1
1
7
1
8
1
Body (W/ Tag & Plug)
Cap
Seat Disc
O-Ring
Needle
Spring6
Cover Seal
Adjusting Nut
Information needed to order repair parts:
Speed Controller Size
Limited One Year Warranty: Danfoss Flomatic valves are guaranteed against defects of material or workmanship
when used for the services recommended. If, in any recommended service a defect develops due to material or
workmanship, and the device is returned, freight prepaid, to Danfoss Flomatic within 12 months from date of purchase, it
will be repaired or replaced free of charge. Danfoss Flomatic’s liability shall be limited to our agreement to repair or
replacement of valve only.
Size
mm
inch
8
1/4
10
3/8
Stainless Steel
Buna-n
Teflon
Part #
MaterialDescription
Danfoss Flomatic
A
inch
mm
2.20
ASTM
316
316Stainless Steel
316Stainless Steel
----------
316Stainless Steel
316Stainless Steel
----------
316Stainless Steel
2.1556
562.20
B
Weight
lbs
.454
1
55
.454
1
552.15
kgmminch
Danfoss Flomatic Corp, 15 Pruyn’s Island, Glens Falls, New York 12801
Phone: 518-761-9797 Fax: 518-761-9798 www.flomatic.com
FC20
Rev. 4
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