ตัวกรองผลการค้นหา
Backing Sand
แปลว่า(english) The bulk of the sand in the flask. The sand compacted on top of the facing sand that covers the pattern.
BALL VALVE
แปลว่า(english) A valve that may be used to divert the flow of fluid in a passage. Most normally configured in a two-way pattern that is either open or closed.