Electrically operated Wire Rope Drum Hoist systems are used for large gates where screw stem or hydraulic cylinder operation is impractical due to long gate travel. Drum hoists are typically supplied using wire rope but can also be configured for link chain. Our scope of supply usually includes the control systems from simple push button stations to more complex PLC controls for integration with SCADA systems.
Screw Stem Hoist are commonly used on vertical Slide Gates, Jet Flow Gates and Fixed Cone Valves. Typically, one or two (dual) stems are connected to the gate and extended in the direction of travel. The stems are threaded and driven through a bronze drive nut that is rotated by hand or power driven with electrical actuator. Electrical actuators are compact and include onboard controls with limit switches and position indication. Screw Stem Hoists are self-locking, meaning position is held without operator forces. Screw stems require routine greasing maintenance.
Hydraulic Systems consist of a pumping unit, often refer to as a Hydraulic Power Unit (HPU), and one or more hydraulic cylinders. Hydraulic systems can provide high load capacity and quick operating speeds. Hydraulic cylinders have a wide range of mounting options to fit any space requirements. Hydraulic fluid piping lines connected the cylinders to the HPU. All HPUs are custom designed to provide all the operating needs for each project. Hydraulic and Electrical controls can be kept basic or expanded for advance control and functionality. One of the biggest advantages to a hydraulic systems arrangement is the ability to gravity lower a gate without power.
Steel-Fab has worked on many sites to rehabilitate and upgrade existing gates and hoisting equipment. These projects include roller chains replaced with wire rope disc layer drums, broken open gear hoist frames with fabricated steel frames, timber gates replaced with steel gates and manual operators upgraded with electrical actuator drives.
Repairing older equipment can be an economical solution that maintains the historical presence of a site.