Cast Iron Stem Gate Valve Cast iron stem gate valve is characterised as having either a rising or a non-rising stem and are produced at HY Valves according to Korea standard KS B2350, and it can also according to DIN 3204 and DIN 3216 standards. Rising stem provides a visual indication of valve position. Non-rising stem gate valves are used where vertical space is limited. Gate valves must be used as fully open or fully closed position where the vibration does not exist in the system. As they are designed as this purpose gate valves are not suited for regulating flow. HY Cast iron stem gate valve can be produced with indicator, rising or non-rising stem, draining plug in GG25, GGG40, GGG40.