Watts 116FM User Manual
Technical Bulletin
3
4
1
2
5
6
CLOSES VALVE
OPENS VALVE
FLOW
ES-ACV-116FM
Job Name
Job Location
Engineer
Approval
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Series 116FM Globe
Fire Pump Relief Valve
Function
Automatically maintains a constant pressure in the fire protection
system by relieving excess pressure.
Features
The WATTS ACV 116FM (Globe) Relief Valve meets all requirements for UL listed, FM Approved fire protection service. The
design and features incorporated in the WATTS ACV Valves
assure accurate control, dependable performance, and long life.
Models
Model 116FM: Globe Pattern Single Chamber Relief Valve
Also Available:
Model 1116FM: Angle Pattern Single Chamber Relief Valve
Materials
Body & Cover: Ductile Iron ASTM A536
Seat (Trim): Stainless Steel CF8M - Xylan Coated
Internals: Stainless Steel S30400 or Ductile Iron
ASTM A536 Fusion Bonded Epoxy
Coated
Stem: Stainless Steel S30400 - Xylan Coated
Spring: Stainless Steel AISI S30200
Elastomers: Buna-N
Control Tubing: Copper
Fittings: Brass
Pressure Relief
Control Body:
Bronze
Contractor
Approval
Contractor’s P.O. No.
Representative
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116FM Globe
Valve Sizes Available in Angle and Globe
3” 4” 6” 8”
UL UL/FM UL/FM UL/FM
Sizes / Approvals
20 - 175 PSI Relief Service
100-300 PSI Relief Service
ANSI End Connections 150, 300, and 300 x 150
Operation
The WATTS ACV Model 116FM PRESSURE RELIEF VALVE
is controlled by a Pressure Relief Control. The Pressure Relief
Control is normally closed, held closed by an adjustable spring
setting to maintain a constant inlet pressure to the main valve.
When upstream pressure increases above the relief set-point,
the Relief Control throttles open, increasing flow through the
control tubing. Pressure is decreased in the main valve cover
chamber, causing the main valve to modulate towards open,
relieving excess upstream pressure. The desired system pressure is maintained.
Components
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
1 - Main Valve
2 - PV20C Relief Control
3 - Pressure Gauge
4 - Fixed Orifice
5 - Check Valve
6 - Flo-Clean Strainer
As the upstream pressure decreases below the relief set-point,
the Relief Control throttles closed, restricting flow through the
control tubing. Pressure is increased in the main valve cover
chamber, causing the main valve to modulate towards closed,
maintaining the desired upstream pressure. Should upstream
pressure drop below and remain below the set-point, the main
valve closes drip tight.
VALVE SIZE
INCH - MM
3 80
6 150
A
150
300
B
C
D
7.875
13.2221.00
12.00
20.00
13.25
10.125
15.00
9.75
11.50
4 100
8 200
9.97
16.00
25.38
15.63
26.38
15.00
10.50
18.50
10.00
13.00
116FM (Globe) - Pressure Relief Valve
DIMENSIONS - ACV 116FM (Globe)
150
120
180
90
210
60
240
270
30
0
300
B
INLET
OUTLET
C
X
WATTS
ACV
XX
A
D
Valve Size 150 Outlet 300 Outlet
A A B C D
in. mm in. mm in. mm in. mm in. mm in. mm
3 80 12 305 131⁄
4 100 15 381 155⁄
4
8
6 150 20 508 21 533 15 381 131⁄
8 800 253⁄
Installation and Start-up
Start-up of an Automatic Control Valve requires following proper procedures. Time must be allowed for the valve to react
to adjustments and the system to stabilize. The objective is to bring the valve into service in a controlled manner to protect
the system from damaging overpressure.
8
645 263⁄
8
337 101⁄
397 101⁄
670 181⁄
8
2
2
257 77⁄
267 915⁄
8
16
4
470 16 406 13 330
200 93⁄
4
248
252 10 254
337 111⁄
2
292
NOTICE: Avoid mounting valves in a vertical discharge postion (valve stem horizontal or cover pointed sideways.) Valves mounted in
this position may not perform as tested and approved.
• Clear the line of slag and other debris.
• Install the valve so that the FLOW ARROW marked on the valve body matches the flow through the line.
• Install pressure gauge (supplied) in the fitting on valve tubing.
1. Turn the Relief Control adjustment screw counterclockwise (out). This lowers the initial relief set-point, allowing the set-point to be
increased to the desired setting.
2. Loosen a tube fitting at a high point on the valve. This allows the cover to vent trapped air during initial filling of the valve.
3. Start the pump to supply fluid/pressure to the valve.
4. Tighten the tubing when all air is vented from the cover as indicated by continual flow of fluid.
NOTICE: THE RELIEF SET-POINT SHOULD BE LOWER THAN DESIRED AT THIS TIME.
5. Turn the Relief Control adjustment screw clockwise (in) slowly, allowing time for the pressure to gradually increase to the desired
set-point.
USA: • Tel. (713) 943-0688 • (713) 944-9445 • www.watts.com
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