Bakelite hand wheel and valve supporting the use of

Bakelite hand wheel and valve supporting the use of:
① When the air supply or electrical signal failure or when the main actuator element (such as diaphragm, spring, seals, transmission parts, etc.) is damaged, take automatic operation to manual operation, can be hand wheel continue to maintain control valve regulation.
② hand wheel can also be used as a control valve stroke limiter. When the signal pressure is zero, the control valve is not fully open fully closed. If the process requires a small amount of the flow control valve, hand wheel can be used to achieve their goals.
③ hand wheel control valve to improve operation reliability. Such as the addition of a bypass valve, the investment costs more, large area, when a larger diameter or higher precious metal costs. Wheel mechanism used in terms of investment costs or an area considered very cost-effective.