SECTION 9

ARMTEC OVERSHOT GATE SHEET 1

GENERAL INFORMATION
REV. APR/90

DESCRIPTION DESIGN
In response to the requirements of the irrigation industry to Given - Water Depth Requirement “D”
improve the regulation of water supply, Armtec developed the - Gate Width “W”
overshot gate. The design has gained wide acceptance in a
short period of time due to its simplicity and capabilities. An Find - Required Hoist System
overshot gate consists of a gate leaf, hinge, and hoist
mechanism. The 600 series is a self-contained unit that Definitions - FSUBTOT = Weight of Water
includes side plates and a hoist support. The action of this - FTOT = Weight of Water and Gate
gate can be likened to a drawbridge hinged across the bottom - FC = Cable Load
of a vertical walled channel. When the gate position is - FH = Hoist Load
horizontal (fully open), water flows through the channel
uninterrupted. As the cable hoist raises the downstream end
of the gate, water flows over the lip while the channel sides
restrict it. Water backs up behind the gate as it reaches
an angle of 60O, as excess water flows over the end of the
gate leaf.
The overshot gate can be set to any position between 0o
and 60o (0.being flat or open), therefore establishing upstream
level control.

APPLICATIONS Gate Leaf in Full Open Position

The overshot gate is ideally suited for three uses:
1 - to maintain a constant upstream water level
CALCULATE THE WATER COLUMN ON THE GATE LEAF
2 - to act as a flow control device
In the fully opened position (worst loading)
3 - to act as a downstream control device
Practical applications include irrigation check structures, D 2
× W × D × 62.4 = FSUBTOT
spillways, and reservoir control structures. The overshot gate sin 60o 3
can also be used as a variable weir in water and sewage
Add 10% for approximate weight of gate
treatment plants.
FSUBTOT× 1.1 = FTOT
ADVANTAGES
1) Intuitive control: with the overshot gate changes in
CALCULATE CABLE LOAD
upstream water level are achieved with gate adjustments of
Each cable retains approximately 1/4 of total weight. Cable
the same amount and direction. Undershot gate upstream level
is angled 60. from the horizontal
changes are dependent on the gate opening and head
differential across the gate. FTOT
= FC
2) Precise control: minimum gate movement with the 4 × sin 60o
overshot is 0.25 inches. Increment or control with a stop log
CALCULATE REQUIRED HOIST LOAD
style of structure is limited by the depth of the low.
3) Inherent safety: overshot gates allow surge flows and
2 x F C = FH
debris to pass over and carry on downstream. The undershot
gates tend to trap debris and surge flows. Surge flows can
PICK A HOIST MODEL
cause water level to rise significantly and damage
that has a capacity equal to or greater than the required
the structure.
load (FH).

- or -

Use the quick selection chart on the reverse of this sheet.

Overshot Gate Undershot Gate

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

OVERSHOT GATE HOIST
SELECTION CHART

HOW TO USE THIS CHART: 3) Example: Gate width “W” = 10 ft.

1) Determine gate width “W” and water depth upstream “D” Water depth upstream “D” = 5.5 ft.
From the chart below you find where the lines
2) Intersect the water depth “D” and gate width “W” on the intersect (marked “X”). The minimum choice of
chart. The heavy line above the square will give you the hoist is a model 709 or a model 809. The type
minimum hoist size allowed. you use depends upon the structural deck layout.
Water Depth Upstream (ft) (D)

Gate Width (ft) (W)

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

 SECTION 9
OVERSHOT GATE 2
SHEET
MODELS: 605, 606, 607
REV. APR/90

DESCRIPTION INSTALLATION
The 600 series Armtec overshot gate is an infinitely adjustable This gate is well suited as an upgrade for existing stop log
overflow weir that is completely self contained. The gate structures or as a new installation. Upstream levels can be
consists of a cable hoist, frame, side plates and leaf. Installa- set to any point between full open and full closed positions.
tion is simple with gates supplied fully assembled or knocked- See sheet 6 for more information on automation.
down. The overshot gate offers a low hoist profile and compact
shape. Gates can be custom fabricated to widths from 2 to 10 USE
feet and water depths to 4 feet. See selection chart for size The 600 series is suitable for a number of applications such
and hoist model required. Many options are available as irrigation canal control, sewage and water treatment plants,
including automation and electric motors with DC and AC power. small reservoir or pond control, and flood control.

Design Data
Hoist Capacity Drum Diameter Cable Diameter Cable/Drum Cross Shaft
Model (lbs) (in) (in) Ratio Diameter (ins)
605 1088 3.75 0.313 12:1 1.250
606 2218 3.75 0.313 12:1 1.375
607 3618 4.50 0.375 12:1 1.750

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

SPECIFICATIONS: 600 Series

Item Description Material Specification

Gear Box Fully Enclosed, Weather Proof, Cast Iron Housing AGMA Class I
Helical Worm Gear Box With
Roller Bearing Mounted Shafts.
Oil Bath Lubrication

Cable Galvanized Wire Rope 6x19 Galvanized Wire RR-W-410D

Wire Core Right Regular Lay

Handwheel Aluminum Handwheel With 2" Cast Aluminum AANo. 356.1

Square Hub

Cable Drum Grooved Cable Drum With Cast Zinc Aluminum AA-ZA12
Internal Cable Clamp

Cross Shaft Precision Ground Steel Cross Steel C1045

Shaft

Pillow Bearing Sealed Ball Bearing Pillow Block Cast Iron Housing ISO 2264
With Set Screw Lock ISO 3145

Gate Leaf Pregalvanized Formed Steel Steel ASTM A-36

Sections

Gate Slide Plate Pregalvanized Reinforced Steel Steel ASTM A-36

Sheet

Gate Frame Formed Hot Dipped Steel Steel ASTM A-36

Gate Hinge Gate Hinge Stainless Steel ASTM 304

Hinge Seal Rubber Seal Between Gate Leaf Neoprene ASTM D2000
and Frame

OPTIONS: Hoist - 12 Volt DC Motor

- 24 Volt DC Motor
- Solar Power

Controls - 4-20 Milliamp (24 Volt) Signal

- Automation Packages, See Sheet 6

Cable - Stainless Steel

Gate - Side Rubber Seals

- Stainless Steel Gate Leaf
- Aluminum Gate Leaf

INVENTORY INFORMATION NOT STOCKED

 SECTION 9
OVERSHOT GATE
SHEET 3
MODELS: 706, 707, 708, 709, 710
REV. APR/90

DESCRIPTION INSTALLATION
The 700 series Armtec overshot gate offers an infinite overflow This series is generally mounted on a concrete structure with
adjustment within its full open and full closed range. This side walls, and no deck is required for the hoist. This gate can
model consists of a separate hoist, gate leaf, and mounting be installed in new structures or existing stop log or radial
hinge. These gates can be fabricated to suit each situation. gate structures with minimal modification. See sheet 6 for
(see selection chart on sheet 1 for gate sizing and hoist model). more information on automation.
Many options are available including electric actuators and
automation packages. USE
The 700 series is suitable for a number of applications such
as small to medium sized irrigation and
reservoir structures.

Design Data
Hoist Capacity Drum Diameter Cable Diameter Cable/Drum Cross Shaft
Model (lbs) (in) (in) Ratio Diameter (ins)
706 2218 3.75 0.313 12:1 1.375
707 3618 4.50 0.375 12:1 1.750
708 6000 6.00 0.500 12:1 2.375
709 9926 6.75 0.563 12:1 2.938
710 13000 7.50 0.625 12:1 2.938

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

SPECIFICATIONS: 700 Series

Item Description Material Specification

Gear Box Fully Enclosed, Weather Proof, Cast Iron Housing AGMA Class I
Helical Worm Gear Box With
Roller Bearing Mounted Shafts.
Oil Bath Lubrication

Cable Galvanized Wire Rope 6x19 Galvanized Wire RR-W-410D

Wire Core Right Regular Lay

Handwheel Aluminum Handwheel With 2" Cast Aluminum AANo. 356.1

Square Hub

Cable Drum Grooved Cable Drum With Cast Zinc Aluminum AA-ZA12
Internal Cable Clamp

Cross Shaft Precision Ground Steel Cross Steel C1045

Shaft

Pillow Bearing Sealed Ball Bearing Pillow Block Cast Iron Housing ISO 2264
With Set Screw Lock ISO 3145

Gate Leaf Painted Steel Steel ASTM A-36

Sections

Gate Hinge Piano Hinge - Galvanized Steel ASTM A-36

OPTIONS: Hoist - 12 Volt DC Motor

- 24 Volt DC Motor
- Solar Power

Controls - 4-20 Milliamp (24 Volts) Signal

- Automation Packages, See Sheet 6

Cable - Stainless Steel

Gate - Galvanized or Stainless Steel Gate Leaf and Hinge

- Side Rubber Seals
- Stainless Steel Gate Leaf
- Aluminum Gate Leaf

INVENTORY INFORMATION NOT STOCKED

 SECTION 9
OVERSHOT GATE
SHEET 4
MODELS: 808, 809, 810, 813, 814
REV. APR/90

DESCRIPTION INSTALLATION
As with the other overshot gate models, the 800 series offers This larger series of overshot gates is normally mounted on a
infinite overflow adjustment within its full open and full closed concrete structure. A deck of concrete or steel is required to
range. The gate consists of a separate hoist, gate leaf, and mount the hoist. Installation can be done on new structures or
mounting hinge. Gate leafs can be fabricated to suit each existing radial gate structures with some modification.
situation. Refer to selection chart on sheet 1 for hoist model
once gate width and water depth has been determined. Both USE
hoist and gate leaf options are available. The 800 series overshot is suitable for larger irrigation canal
control and reservoirs.

Design Data
Hoist Capacity Drum Diameter Cable Diameter Cable/Drum Cross Shaft
Model (lbs) (in) (in) Ratio Diameter (ins)
808 7060 6.00 0.500 12:1 1.250
809 10800 7.50 0.625 12:1 1.250
810 15700 9.00 0.750 12:1 1.250
813 20200 10.5 0.875 12:1 1.250
814 29500 12.0 1.000 12:1 1.250

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

SPECIFICATIONS: 800 Series

Item Description Material Specification

Gear Box Fully Enclosed, Weather Proof, Cast Iron Housing AGMA Class I
Helical Beve;;ed Gear Box With
Roller Bearing Mounted Shafts.
Oil Bath Lubrication

Actuator Electric Actuator Complete with

Position Limit & Torque Switches

Cable Galvanized Wire Rope 6x19 Galvanized Wire RR-W-410D

Wire Core Right Regular Lay

Cable Drum Steel Grooved Cable Drum With Steel ASTM A-36
Internal Cable Clamp

Cross Shaft Precision Ground Steel Cross Steel C1045

Shaft

Coupling Gear Couplings

Gate Leaf Painted or Galvanized Steel ASTM A-36

Gate Hinge Piano Hinge - Galvanized Steel ASTM A-36

OPTIONS: Hoist - Helical Worm Gear Motor

- Single Phase and Three Phase Power

Controls - 4-20 Milliamp (24 Volt) Signal

- Automation Packages, See Sheet 6

Cable - Stainless Steel

Gate - Stainless Steel Gate Leaf and Hinge

- Side Rubber Seals
- Hinge Rubber Seal
- Dewatering Side Gate

INVENTORY INFORMATION NOT STOCKED

 SECTION 9
OVERSHOT GATE
SHEET 5
MODELS: 907, 909, 911, 913
REV. APR/90

DESCRIPTION INSTALLATION
The 900 series are the largest overshot gates available from This largest series of overshot gates is normally mounted in a
Armtec. Infinite overflow level adjustments can be maintained concrete structure. A deck of concrete or steel is required to
within the full open and full closed range. The gate consists of support the hoist. Installation can be done on new structures
a separate hoist, gate leaf, and mounting hinge. Gate leafs or existing structures with some modification required.
can be fabricated to suit each situation. There are several
options available for both gate leaf and hoist including USE
automation. Refer to selection chart on sheet 1 for hoist model. The 900 series is suitable for large irrigation canals
structures or reservoirs.

Design Data
Hoist Capacity Drum Diameter Cable Diameter Cable/Drum Cross Shaft
Model (lbs) (in) (in) Ratio Diameter (ins)
907 22400 10.50 0.875 12:1 2.000
909 29500 12.00 1.000 12:1 2.000
911 48500 16.50 1.375 12:1 2.500
913 60000 19.50 1.625 12:1 2.500

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

SPECIFICATIONS: 900 Series

Item Description Material Specification

Gear Box Fully Enclosed, Weather Proof, Cast Iron Housing AGMA Class I
Planetary Gear Box With
Roller Bearing Mounted Shafts.
Oil Bath Lubrication

Actuator Electric Gear Motor Complete

with Starter, Push Buttons and
Limit Switches

Cable Galvanized Wire Rope 6x19 Galvanized Wire RR-W-410D

Wire Core Right Regular Lay

Cable Drum Steel Grooved Cable Drum With Steel ASTM A-36
Internal Cable Clamp

Cross Shaft Precision Ground Steel Cross Steel C1045

Shaft

Coupling Gear Couplings

Gate Leaf Painted or Galvanized Steel ASTM A-36

Gate Hinge Piano Hinge Steel ASTM A-36

OPTIONS: Hoist - AC Electric Actuator, Three Phase and Single Phase

Controls - 4-20 Milliamp (24 Volt) Signal, 0 to 100 Percent Scale

- Automation Packages, See Sheet 6

Cable - Stainless Steel

Gate - Stainless Steel Gate Leaf and Hinge

- Side Rubber Seals
- Hinge Rubber Seal
- Dewatering Side Gate

INVENTORY INFORMATION NOT STOCKED

 SECTION 9
AUTOMATED CONTROL SYSTEMS
SHEET 6
MODELS: AC-1, AC-2, AC-3
REV. APR/90

DESCRIPTION 2) to maintain a constant flow through a control gate. This is a

Armtec offers several automated gate control systems of function of gate position and upstream water level. Constant
varying sophistication specifically designed to operate flow is required where accurate water volumes must be
overshot gates. These systems can also be adapted to delivered over time.
standard undershot gates (i.e. sluice, radial and roller gates).
These control systems may be required to perform one of 3) to maintain a constant downstream level by modulating the
three functions. upstream control gate. An application of this function is
downstream level control for farm turnouts in irrigation canals.
1) to maintain constant upstream level by modulating the
control gate. This feature is required on irrigation check
structures to maintain constant hydraulic head on farm
turnouts. This feature also can control surges on ponds and
reservoirs caused by excessive inflow (i.e. rain fall).

The Armtec AC-1 The Armtec AC-2 The Armtec AC-3

Is a simple two set point level controller Comprises of a basic programmable logic Is a multi use high quality control
that will maintain one fixed water level. controller which controls the gate by way system. It is the most sophisticated and
The system comprises of two water level of input from gate position indicator and versatile system Armtec offers. The AC-3
actuated switches, timer mechanism and level position indicator. The system can comprises of an industrial grade
relays. These switches are placed at the be easily set and changed for level and programmable logic controller, pressure
minimum and maximum water level flow control by way of the user interface transducer level indicator, rotary gate
fluctuation acceptable (range must be at (MMI-102). This system has been position indicator, control panel and
least 6" to prevent constant gate designed primarily for single structure use control interface. This system can be
modulation). The gate will modulate as but can be expanded to control multiple used on multiple sites and tied into a
the water level changes between the sites. Its main function is upstream level central control unit via radio or telephone
two level switches. This system is control but can be adapted to control flow link up. The system can be used for
economical but not flexible. Once set, and downstream level. This system can upstream level control, flow control and
the system levels can not be changed be linked to a central control site by use down stream level control. Generally the
without physically moving the hardware. of radio or telephone lines. This system AC-3 would be implemented on large,
Using a time delay, the gate will sense is not as rugged as the AC-3 system and multiple, and critical structures.
at time intervals to prevent constant is recommended for use in smaller canal
gate modulation. and reservoir structures.

ARMTEC WATER CONTROL PRODUCTS RESERVES THE RIGHT TO ALTER DESIGN

SPECIFICATIONS: Automated Control Systems

Item AC-1 AC-2 AC-3

Gate Position Rotary Device Emitting Rotary Device Emitting

Indication a 4-20 Milliamp Signal a 4-20 Milliamp Signal

Gate Position Actuator Position Limits Rotary Limit Switch Rotary Limit Switch
Stops

Power Source 12/24 Volt 12/24 Volt 12/24 Volt

(Controls Only) Batteries and Charger

Software Proprietary Proprietary

Process Windows

Controller Relays PLC - Medium Duty PLC - Industrial Grade

Interface On/Off Switch MMI/102 MMI/102

PC Computer

Level Indication Proximity Switches Float System Pressure Transducer

Cabinet NEMA-4 NEMA-4 NEMA-4

OPTIONS: Installation and Wiring Installation and Wiring Installation and Wiring

Vandal Cabinet Solar Power Remote Monitoring and

Control System (Multiple
Downstream Weir Sites) via Telephone
for Flow Control Line or Radio

High and low alarms Alarms

Vandal Cabinet Vandal Cabinet

INVENTORY INFORMATION NOT STOCKED