- Patent (No. 10-0927965): A butterfly valve with means for prefabricated rotary restricting
- Patent (No. 10-0927361): A butterfly valve with improved airtight function
The stopper ring is attached to the axis so that it spins together with the axis, and the stopper is fixed to the cover, playing the role of stopper as a result of strong bearing power. (The role of double support improves durability.) - It is attached to the end of the axis, allowing the user to check accurate disc status at all times.
- It can be assembled and installed easily, ensuring convenience in maintenance in case of emergency.
- It can be fixed to the disc simply, enabling safe maintenance.
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