I work for WooYang Ind. Co. in South Korea.

My Company makes the soft seal valve(50mm~600mm), Butterfly valve and others out of ductile, grey cast iron and hi-Cr grey cast iron.

But We have big problem. The problem is the dross(comtaminate) in the product. To solve this problem, we make various runner. But we can't solve this problem.

If anyone have solution for this problem, please reply to me.

Thanks.

My e-mail address is sinwoo.kang@gmail.com.