Steel Fab has provided innovative design and fabrication expertise to a wide range of industries since 1967. We have two manufacturing facilities in Fitchburg, Massachusetts and a fully staffed engineering department to produce a wide range of large fabricated gates, gate operating systems, fixed cone valves for dams, hydroelectric stations and municipal water and waste water applications.
The Vertical Slide Gate is one of the more basic style of water control gates. Typically used at low to medium heads, this gate consists of a flat reinforced gate leaf with low friction bearing pads and perimeter seals. The Slide Gate operates vertically within a new or existing guide frame. These gates may be operated with a hydraulic cylinder or a screw stem system using manual gearboxes or electric actuators.
A common application for Slide Gates is on an intake structure. A Slide Gate may also be used as a Weir Gate that lowers to open. The water passes over the top making this style useful for passing floating debris. Dual stem arrangements can be provided for extra wide gates.
The Crest Gate is a spillway style gate used for water level control and trash sluicing. It consists of a reinforced leaf with bottom hinges mounted to the waterway floor. The gate is opened and closed by rotating about these hinges. In the lowered position, the gate leaf conforms to the profile of the spillway crest.
Steel-Fab Broome Gates, also known as Caterpillar Gates, are roller-mounted vertical lift gates supported along either side by stainless steel roller chains. Otherwise, their construction and function is very similar to that of Roller Gates. Broome gates feature a sloped sealing surface. However, if the sealing surface is vertical, they are sometimes called Coaster or Tractor Gates.
Fixed Cone Valves
Known for its excellent energy dissipation, the Fixed Cone Valve is a regulating discharge valve for outlet works on medium to high head dams. This valve features a conical head that extends beyond the end of a cylindrical body. Radial ribs support the cone and the opening that is controlled by a sliding gate sleeve. The gate sleeve slides over the valve body and opening to control flowrate and fully close against the cone. As the valve opens the flow is dispersed into the atmosphere in an expanding cone shape that aerates and disperses energy.
Jet Flow Gates
Jet Flow Gates are used as regulating gates to provide controlled discharge on outlet and bypass structures. They are most commonly installed for free discharge in the horizontal direction, but some are set at a downward angle or below tailwater for submerged discharge. The Jet Flow Gate is like a bonneted slide gate in appearance but includes a circular floating seat ring. The seat ring, or seal ring, is a tapered orifice and the primary design feature that contracts flow through the gate body and jet flow gate valve to safely discharge downstream. The contracting flow allows air to be introduced without cavitation or vibration.
Aero-Mod's SEQUOX process offers the benefits of sequencing aeration with the reliability of continuous clarification, resulting in consistently superior effluent quality.
Tainter (Radial Gates)
Tainter gates, also referred to as radial gates are primarily used as spillway (flood control) gates due to their simplicity and efficient design. They consist of a curved skinplate reinforced by horizontal or vertical stiffening ribs and supported by radial arms on each side of the gate.
Bulkhead Gates and Stop Log Panels are mainly used to isolate a waterway structure for maintenance. These gates or panels are installed and removed under balance head conditions with a crane. Commonly, a Bulkhead Gate refers to a single panel gate and Stop Logs are furnished in multiple sections to reduce required lifting forces.
Roller gates are vertical lift gates with a series of rollers or wheels located along each side of the leaf. The rollers transfer hydraulic load from the gate to the roller tracks mounted in the guide slots on each side of the gate opening. The wheels minimize frictional forces when raising and lowering the gate reducing the load on the gate operating system. Roller Gates, also referred to as Fixed Wheel Gates, are typically used where opening sizes are too large to efficiently use slide gates or for applications where gravity closure is a requirement.