CAST IRON FLAP GATES SERIES 10C, 20C, 50C - Armtec

CAST IRON
FLAP GATES

SERIES 10C, 20C, 50C

Flow Control Gates

General Design
Armtec flap gates are used to control flow Armtec cast iron flap gates are available in standard
automatically. with a small differential pressure on sizes from Ø102 to Ø2438 and various square and
the back of the gate, it opens automatically to allow rectangular models. Cast iron flap gates are divided into
discharge. When the head is greater on the face three series: 10C, 20C and 50C.
side of the gate, the flap closes automatically to
prevent backflow. All flap gate models are flat back • 10C designed for 10’ (3m) of face pressure (seating
to allow mounting on a pipe flange or head wall. head)
No lifting device is required.
• 20C designed for 20’ (6m) of face pressure (seating
Flap gates act as natural skimmers of debris such as head)
branches, logs and trash. It is recommended that
frequent inspection and cleaning be scheduled to • 50C designed for 50’ (15m) of face pressure (seating
keep the flap gate working effectively. Installation head)
should incorporate a vertical elevation drop below
the flap gate of 300 to 600 mm, to allow debris to Double Hinge Action (20C & 50C models only)
work its way free of the gate. All Armtec flap gates are equipped with double action
hinges to ensure proper seating of the flap against the
Protection of a flap gate should be considered when frame. The main hinge action of the flap is about the
the installation projects into a stream flow where upper pivot points on the frame. The flap rotates
heavy debris or ice may be present. approximately 90o about this point. The lower pivot
points on the flap allow only a few degrees of rotation
Head losses through Armtec flap gates are minimal between the hinge and the flap. This allows the flap to
when compared with other losses in the hydraulic align and create a flat seal, while preventing the flap
structure. Should more information about head loss from rotating in relation to the hinge arms.
be required, please contact your local Armtec
representative. Adjustable Top Pivot Points (20C & 50C only)
The model 20C and 50C incorporate adjustable top
pivot points. The upper pivot point of the hinge arms
can be adjusted in or out from the wall to optimize
gate action and sealing.

Series 10C, 20C, 50C 1
Flow Control Gates

Mountings On Steel Surface
The cast iron flap gate can be installed onto a variety • MF (Metal Flange)
of mounting surfaces as defined by the following
codes: • MT (Metal Thimble)

On Concrete Surface
• FC (Flat Concrete Wall)

• CC (Curved Concrete Wall)

Cast Iron Flap Gate Thimble Detail (MT) Concrete Wall Mount Detail (FC)

Flap Gate Curved Back Detail (CC) Flap Gate Metal Flange Detail (MF)

Series 10C, 20C, 50C 2
Flow Control Gates

Series 10C Flap Gate

Description Installation
The model 10C (for seating heads up to 3.0 metres The model 10C flap gate is manufactured in a flat back
or 10 feet) incorporates the simplest circular flap configuration. The gate is easily mounted on either
gate design, with a double hinge action. The frame concrete headwalls or pipe flanges, and Armtec can
and the flap are of cast iron construction with supply flanges for corrugated steel pipe installations.
galvanized hinge arms and fasteners. All pivot wear
points are bronze bushed. A lifting eye is cast Use
integrally with the flap to permit manual operation. This economical flap gate is used for low head
situations, where back flooding of storm water
structures has to be prevented.

SIZE Design Data Pivot
øA D Radius
BC
102 228 76 152
152 280 114 114 95 220
203 343 140 140 102 327
254 406 171 195 104 358
305 483 203 212 105 424
381 565 242 234 112 516
457 635 282 303 129 620
508 700 318 346 141 701
610 813 350 384 143 811
762 984 407 457 154 992
914 1168 492 553 181 1187
1067 1346 584 670 187 1335
1219 1511 673 738 194 1583
756 902
Series 10C, 20C, 50C 3
Flow Control Gates

Series 20C Flap Gate

Description Installation
The model 20C flap gate is a circular medium duty This model of flap gate can be mounted on a concrete
gate that can withstand seating heads up to 6.0 headwall, cast iron wall thimble, or a steel pipe flange.
metres or 20 feet. Features include a double hinge
action and adjustable top pivot points. The gate is Use
available in a flat back frame with either cast iron The 20C gate can be used in a variety of locations
or bronze seating faces. The hinge arms are cast where one way flow of water is required and where
iron similar in composition to the frame and cover, expected seating heads do not exceed 6.0 metres.
and all four pivot points are bronze bushed. Examples include flood control, sewer outfalls, irrigation
Fasteners are available in galvanized or stainless systems, tidal drainage, and water/waste water
steel. A lifting eye is cast integrally with the flap to treatment.
permit manual operation.

SIZE Design Data Pivot
øA D Radius
BC
102 229 76 176
152 279 114 124 86 298
203 343 140 210 105 355
254 406 171 241 105 387
305 483 203 248 108 425
356 533 241 260 130 502
381 565 267 318 130 516
406 597 286 318 130 540
457 629 298 330 140 635
508 698 318 400 140 667
610 813 349 413 152 794
762 940 406 489 178 953
914 1118 470 597 184 1143
1067 1289 559 699 196 1346
1219 1448 648 826 220 1543
1372 1632 724 959 220 1676
1524 1753 819 1010 244 1905
1829 2083 876 1168 315 2261
1041 1378
Series 10C, 20C, 50C 4

Flow Control Gates

Series 50C Flap Gate

Description Installation
The model 50C flap gate is a circular heavy duty The model 50C flap gate is available in a flat back
gate that can withstand seating heads up to 15.0 configuration for installation on either concrete
metres or 50 feet. This is Armtec’s top of the line headwalls, cast iron wall thimbles or steel pipe flanges.
flap gate. Features include double hinge action,
adjustable top pivot points, and a number of seat Use
options; cast iron, bronze, or rubber seating faces. The model 50C can be used in most applications with
All fasteners are stainless steel, and the frame, flap seating heads up to 15.0 metres or 50 feet. This
and hinge arms are cast iron. A lifting eye is cast includes outfall structures, flood control, water/waste
integrally with the flap to permit manual operation. water treatment, irrigation, tidal drainage and pump
discharge. Please note that rubber seating faces are
recommended for pump discharge applications.

SIZE Design Data Pivot
øA D Radius
BC
102 229 76 176
152 279 114 124 86 298
203 343 140 210 105 355
254 406 171 241 105 387
305 483 203 248 108 425
356 533 241 260 130 502
381 565 267 318 130 516
406 597 286 318 130 540
457 629 298 330 140 635
508 698 318 400 140 667
610 813 349 413 152 794
762 984 406 489 198 978
914 1168 495 590 198 1156
1067 1346 584 699 205 1359
1219 1511 673 826 220 1568
1372 1683 756 959 220 1708
1524 1854 845 1010 260 1930
1676 2032 927 1168 260 2108
1829 2197 1016 1270 318 2286
1981 2375 1099 1378 318 2464
2134 2540 1187 1480 404 2648
2438 2896 1270 1581 450 2978
1295 1753
Series 10C, 20C, 50C 5

Flow Control Gates

Gate Identification Code:

(The Gate Identification Code is a fast and efficient method to specify the gate which is required.)
1. Gate Series – 10C, 20C or 50C

2. Opening size in millimeters – diameter or width x height
3. Seating Face Options

Code Seating Face
MC Machined Cast Iron
MB Machined Bronze (20C or 50C only)

4. Mounting Type

Code Mounting Surface

On Concrete Surface

FC Flat Concrete Wall

CC Curved Concrete Wall

On Metal Surface

MF Metal Flange

MT Cast Iron Thimble

5. 20C or 50C Options

Code Option (More than one can apply)

PST Paint Steel Link Arms

LA4 Link Arms 304SS Material

LA6 Link Arms 316SS Material

GN Grease Nipples at Pivot Points

FN6 316SS Fasteners

Series Size Seating Mounting 20C or 50C
(mm) Face Type Options

Series 10C, 20C, 50C 6
Flow Control Gates

Gate Specifications

1. General Specifications 3. Gate Assembly Product Details
1.1 Scope The gate assembly shall consist of the gate seat, frame,
link arms and accessories. The gate assembly shall be
This specification covers cast iron flap gates in which factory assembled prior to shipment. The gate
the gate is designed to withstand seating heads in assembly shall be available in 10C, 20C or 50C as
water supply applications. detailed in Section 4 (Materials).

1.2 Governing Standards 3.1 Gate Frame

No AWWA specifications currently cover the use of The cast iron gate frame shall have a flat back
cast iron flap gates. configuration suitable for attachment to a concrete
wall or a round pipe flange.
1.3 General
The self-contained gate shall consist of a frame cover,
The gate assembly shall consist of the gate frame and link arms and accessories.
cover and accessories. The gate assembly shall be
designed, fabricated and shop assembled in 3.2 Gate Seating Faces
accordance with the manufacturer’s shop drawings
and specifications. The gate shall be furnished with machined metal
seating faces available in machined cast iron or bronze
1.4 Acceptance of Approved Alternate Products combinations detailed in Section 4 (Materials). In the
closed position, the clearance between the cover and
To be considered by the Engineer as an approved the frame shall not exceed 0.004” (0.10 mm).
alternate product, the alternate gate manufacturer
shall submit a list of 50 fabricated gate projects 3.3 Gate Assembly Fasteners
(minimum) indicating proven operation in similar
applications. Gate Assembly Fasteners shall be in accordance with
Section 4 (Materials).
1.5 Quality Assurance
3.4 Mounting Gaskets and Anchors
Prior to shipment, the gate assembly shall be shop
inspected and adjusted for proper operation. The gate shall be mechanically fastened to the
mounting surface with anchor bolts or with fasteners.
1.6 Submittals Gasket material shall be butyl rubber sealant in
accordance with Section 4 (Materials).
The manufacturer’s shop drawings shall indicate the
gate assembly’s opening size, type of material,
schedule of parts and principal dimensions. Gate
assembly installation procedures shall also be provided
to supplement the shop drawings.

2. Performance
Seating heads shall be measured from the water
surface to the centre of the gate slide. The gate
assembly shall be designed to the design heads shown
below:

• Seating Head: 3m (10’) - 10C
• Seating Head: 6m (20’) - 20C
• Seating Head: 15m (50’) - 50C

Series 10C, 20C, 50C 7
Flow Control Gates

4. Materials

Component 10C 20C or 50C
Frame/Cover
Cast Iron A48 Cast Iron A48
Link Arms • Class 30 • Class 30

Galvanized Steel Cast Iron A48
• Structural Steel • CSA G40.21
• CSA G164 Painted Steel (Option)
• Class 30
Seating Faces Machined Cast Iron SSTL (Type 304 or 316) (Option)
• A48, Class 30 • ASTM A276

Assembly Fasteners Zinc Plated Steel Machined Cast Iron
• Grade 5 (Bolts) • A48, Class 30
• Grade 2 (Nuts) Machined Aluminum Bronze -
Option
Mounting Gasket Butyl Joint Sealer (12mm square) • ASTM B36, C26000
• Hamilton Kent - Kent Seal
Anchor Bolts SSTL (Type 304)
Zinc Plated Steel • ASTM F593 (Bolts)
Paint • Grade 5 (Bolts) • ASTM F594 (Nuts)
(Frame, Cover, Link Arms) • Grade 2 (Nuts) • Option 316SS
5. Slide Gate Schedule
Amerlok 400 Butyl Joint Sealer (12mm square)
• Hamilton Kent - Kent Seal

SSTL (Type 304)
• ASTM F593 (Bolts)
• Option 316SS

Amerlok 400

Gate Tag No.
Gate Type (10C, 20C, 50C)

Dimensions (diameter or rectangle/square)

Mounting Surface (FC, CC, MF, MT)

6. Installation 7. Commissioning
Handling and installation of all components shall be in After installation of the gate, the seating surfaces shall
accordance with the manufacturer’s shop drawings be cleaned thoroughly of all foreign materials, the
and installation instructions. If the gate is to be stem lubricated (if required) and the final adjustments
mounted to a concrete wall, extra care should be taken made. The gate shall then be cycled from the fully
to ensure that the wall is flat and smooth with a closed to the fully open position to ensure smooth
maximum variation of 3mm across the mounting operation of the gate.
surface of the gate.

Series 10C, 20C, 50C 8
Flow Control Gates

Armtec Cast Iron Flap Gate 10C, 20C, 50C Quick Inquiry Sheet

Project Name:

Company Name:

Address:

Phone:

Fax:

Email:

Unit of measure: mm inch

Step 1:

Tag Number: Quantity:

SERIES MOUNTING 20C & 50C OPTIONS ONLY

10C Flat Concrete Wall (FC) Paint Steel Link Arm

20C Curved Concrete Wall (CC) Machined Cast Iron Face Link Arms 304SS

50C Metal Flange (MF) OR Link Arms 316SS

Cast Iron Thimble (MT) Machined Bronze Face Grease nipples at pivots

316SS Fasteners

Step 2:
Gate Size :

Height OR Diameter Flow

Width: Width Diameter: 9
Head:
x Height:

Series 10C, 20C, 50C
Flow Control Gates