Armtec is well known as an industry leader in the design and manufacture of precision gates for waste-water treatment plants, waterworks, irrigation and flood control projects. Thousands of customers throughout the world attest to the high quality and top reputation of Armtec’s wide selection of gate products. Our experience and reputation has been developed over more than 70 years.
Sluice gates are comprised of two major parts: the frame and the slide. Both the frame and slide have embedded bronze seating strips, which are pressed together by the attached wedging devices when the gate is closed. The frame outlines the opening in the wall that requires flow control. The slide, when fully inserted into the frame, blocks the flow of liquid. As the slide is raised it proportionately uncovers the area of the opening, until the opening is completely uncovered.
Water pressure pushing the slide toward the wall is called seating head, whereas water pressure pushing from within the opening is called unseating head. Gates are rated by the amount of head that they are capable of withstanding. For example, a model 55-20 gate can withstand 55 feet or 17.0 meters of seating head, and 20 feet or 6.0 meters of unseating head.
Features and Benefits:
Premium quality – components are cast and mating surfaces are machined to very precise tolderances to meet AWWA C560-00 requirements
Precision Seating Faces
Adjustability
Rugged Design
Proven Performance
Applications:
Process facilities where unexpected maintenance shutdowns would be prohibitively costly
Areas where consistent, low rates of leakage over time is important
Dams, dykes, critical installations or high head applications where reliability, durability and long-term performance are critical
Installations where debris may become trapped between the gate slide and frame during operation
Where the initial capital cost is of primary importance, the fabricated gate will offer good value. Fabricated gates generally incorporate resilient seating faces (plastic or rubber) to achieve water tightness; these seats will or may require replacement with time and use. Economical fabricated gates do not employ wedging devices to allow for adjustment due to wear.
Armtec manufactures a standard size range, suitable for most applications. Custom sizes can be fabricated with a cost increase. This may be required where gates must be built to fit existing structures or where certain processes require special sizing.
Features and Benefits:
Quality - Designed to AWWA standards and generally accepted structural engineered design procedures
Versatility – can be designed to suit any irregular or existing opening
Resilient Seating Faces
Watertight
Stainless Steel or Aluminum materials available
Cost effective solution
Several models available depending on the installation
Overshot gates are designed for use in open-channel flows where upstream level control is required. Armtec’s unique design includes a bottom hinge and a channel-floor recess that enables the fully opened gate to lie flat on the channel floor. The premise of the design is that of a moveable weir. Overshot gates are operated by single or tandem cable hoists, specifically designed by Armtec for these applications.
An overshot gate consists of a gate leaf, hinge, and hoist mechanism. The 600 series is a self-contained unit that includes side plates and a hoist support. The action of this gate can be likened to a drawbridge hinged across the bottom of a vertical walled channel. When the gate position is horizontal (fully open), water flows through the channel 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 60degrees, as excess water flows over the end of the gate leaf. The overshot gate can be set to any position between 0 o and 60 degrees . (0 degrees being flat or open), therefore establishing upstream level control.
Features and Benefits:
Intuitive control – changes in upstream water level are achieved with gate adjustments of the same amount an ddirection
Precise control – minimum gate movement is 0.25 inches. Increment or controle with a stop log style of structure is limited by the depth of the low
Inherent safety – Surge flows and debris pass over and carry on downstream
Large selection of models available depending on installation. Contact your Armtec Sales Representative for more information.
Radial gates are designed for wide and unobstructed waterways where a light-weight economical gate with minimal hoist effort to open and close is required. A radial gate consists of a curved gate leaf, rubber seals, support arms, seal rubbing embedments and embedded pivot points. The gate leaf is of a welded construction varying in width and height as required by the size of the opening. Embedded rubbing seats are mounted flush with the wall to provide a smooth flat surface for the seals to slide on as the gate opens and closes.
Water pressure applied against the curved gate leaf is transmitted through the support arms into the pivot points, which are embedded in the concrete wall. Since the gate leaf is curved, the water also applies a pressure upward, thereby lowering the lifting force required. A smaller hoist is therefore necessary as compared to other types of gates. Radial gates are used primarily for upstream level control in open-channel installations. Flow is always one-way, against the face of the gate. Low lifting forces are required for radial gate operation, which is normally by cable hoists.
Roller gates are designed to control flow through large waterway openings, where economy and ease of operation are important. They are also the most versatile gates in terms of size. A roller or fixed-wheel gate consists of a fabricated steel slide, cast iron rollers, and rubber seals. The gate leaf is a box-like design of welded construction and varies in width and height as required by the size of the opening. The thickness is determined by the water pressure. Slots at the sides of the gate opening are required for the rails and contact faces for side seals.
The thrust developed from water pressure against the gate is transmitted through the rollers to the rails and into the structure. The lift capacity required to open the gate under maximum operating conditions is minimized as the thrust is transferred to rolling friction.
Features and Benefits:
Lower friction resistance in opening/closing than sliding surfaces
Versatile size range
Custom designed
Variety of finishes available
Can be overflow type (where water depth is the same as the height of the gate slide) or breastwall type (where water is considerably deeper than the height of the gate, and/or where complete closure of the opening is desired)
Flap gates are used in applications where flow is always in one direction and where back-up flow is acceptable. The gate is opened by water pressure on the back of the gate flap and is closed by water pressure on the face. Gates are square or circular and normally hinged at the top. Seating surfaces are fitted with machined seating faces.
Features and Benefits:
Double hinge action
Adjustable top pivot points
Various models available depending on the installation
The gate consists of a flatback cast iron seat, slide and crossbar, which is attached to a yoke. The yoke supports the lift system forming a self-contained unit. Cast iron gates are robust and designed with structural safety factor of 5 to resist warping, deflection under head and damage when closing on debris. Minimum maintenance is required.
Lifting devices for gates vary from the simple handwheel to an elaborate electrically operated unit with torque and limit switches. The type selected depends upon gate size, unbalanced hydraulic head, desired speed of gate travel, and the frequency of operation.
Sluice gates are comprised of two major parts: the frame and the slide. Both the frame and slide have embedded bronze seating strips, which are pressed together by the attached wedging devices when the gate is closed. The frame outlines the opening in the wall that requires flow control. The slide, when fully inserted into the frame, blocks the flow of liquid. As the slide is raised it proportionately uncovers the area of the opening, until the opening is completely uncovered. 
Where the initial capital cost is of primary importance, the fabricated gate will offer good value. Fabricated gates generally incorporate resilient seating faces (plastic or rubber) to achieve water tightness; these seats will or may require replacement with time and use. Economical fabricated gates do not employ wedging devices to allow for adjustment due to wear. 
Overshot gates are designed for use in open-channel flows where upstream level control is required. Armtec’s unique design includes a bottom hinge and a channel-floor recess that enables the fully opened gate to lie flat on the channel floor. The premise of the design is that of a moveable weir. Overshot gates are operated by single or tandem cable hoists, specifically designed by Armtec for these applications. 
Radial gates are designed for wide and unobstructed waterways where a light-weight economical gate with minimal hoist effort to open and close is required. A radial gate consists of a curved gate leaf, rubber seals, support arms, seal rubbing embedments and embedded pivot points. The gate leaf is of a welded construction varying in width and height as required by the size of the opening. Embedded rubbing seats are mounted flush with the wall to provide a smooth flat surface for the seals to slide on as the gate opens and closes.
Roller gates are designed to control flow through large waterway openings, where economy and ease of operation are important. They are also the most versatile gates in terms of size. A roller or fixed-wheel gate consists of a fabricated steel slide, cast iron rollers, and rubber seals. The gate leaf is a box-like design of welded construction and varies in width and height as required by the size of the opening. The thickness is determined by the water pressure. Slots at the sides of the gate opening are required for the rails and contact faces for side seals.
Flap gates are used in applications where flow is always in one direction and where back-up flow is acceptable. The gate is opened by water pressure on the back of the gate flap and is closed by water pressure on the face. Gates are square or circular and normally hinged at the top. Seating surfaces are fitted with machined seating faces. 
The gate consists of a flatback cast iron seat, slide and crossbar, which is attached to a yoke. The yoke supports the lift system forming a self-contained unit. Cast iron gates are robust and designed with structural safety factor of 5 to resist warping, deflection under head and damage when closing on debris. Minimum maintenance is required.