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  iVG™ Internal Valve Gate
Double Production
The new Rheo-Pro® iVG™ is the world's most compact back-to-back valve gate hot runner system and the first and only internal valve gate on the market. It is also the only valve gate hot runner that operates entirely without seals. Its patented design completely rewrites the rules of valve gating technology and opens up endless new possibilities for high cavity stack molds, swivel molds, and multi-material injection.
'Short Stack'
The compact design of Rheo-Pro® iVG™ nozzles makes it possible to build back-to-back 'short stacks' or stack molds with a tip-to-tip length of only 285 mm and a pitch or gate-to-gate distance of 63.5 mm. The extremely space efficient iVG offers exciting new options for tool makers and OEMs seeking the most competitive injection molding solutions. For molders, the ability to produce more plastic parts in smaller machines with less clamp tonnage means better operating costs, significantly higher production outputs and most importantly, more profitability.
iVG™ stack mold systems are ideal for high volume plastic parts such as caps and closures for the packaging industry
For example, at a 3.0 second cycle time, a 64+64 stack mold for 26 mm light weight bottle caps can produce 3.5 million parts per day in a 790 x 630 mm stack mold. The melt channels are reduced in size, length and volume to enhance color change and pressure drop for higher viscosity materials. The new iVG™ back-to-back valve gate nozzle increases mold uptime and improves conventional manifold systems. The valve-to-valve melt transfer through the mold parting surface eliminates the traditional sprue bar.
Compact and Robust
Maintenance Made Easy
The Rheo-Pro® iVG™ is completely front-serviceable from the mold parting line. Every component, including nozzles, valve actuators and valve pins, can be accessed quickly by simply stripping the cavity plate onto the core side while the entire mold remains inside the machine. Preventative maintenance is effectively reduced to minutes.
Cool Under Pressure
The iVG™ performs well under the most demanding processing conditions, unlike electric valve gates and conventional pneumatic cylinders, that can fail in extremely hot operating environments. The iVG™ does not require any seals, hoses, tubes, belts or motors, making it the most durable and maintenance friendly valve gate system ever built.
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Increase production output and profitability |
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Lower capital investment: smaller injection molding machines with less tonnage required |
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Substantial energy savings improve production cost and carbon footprint |
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Internally air actuated valve gates allow for new ultra-compact stack mold designs |
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No seals, no maintenance |
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Air actuation performs well in tough, high temperature molding environments |
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Rheo-Pro® iVG™ 'short stack' systems offer unprecedented stack heights and gate-to-gate spacing
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Small Size, Big Performace
A standard 48+48 iVG™ stack mold in a small 200 ton machine can produce 96 light weight bottle closures every 3 seconds or almost 3 million parts per day, making it 30% more cost efficient than a conventional 96 cavity single face hot runner system.
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Energy Savings
Rheo-Pro® internal valve gates substantially improve the carbon footprint of the molding cell through increased energy efficiency in the heating of the hot runner system as well as the operation and production of smaller molds and machines. For example, energy consumption alone in a 48+48 iVG™ closure stack mold results in total cost savings of over $23,000 annually, or 56% compared to a single face mold with the same number of cavities. This does not include the additional savings in productivity gains and capital equipment that results in up to 30% lower production costs.
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