The Intelligentization of Regulating Valve
Intelligentization is a development trend for regulating valves. Intelligentization includes the self-diagnosis of regulating valves; reducing product types, and simplifying the production process.
An intelligent valve positioner, generally speaking, is automatic. But when the gas signal or electrical signal encounters failures, or when the main components (diaphragm, springs, etc.) of the actuator are damaged, we need to change the automatic operation to manual operation and need to turn the handwheel to maintain the regulating function of the valve. On the other hand, it can also be used as a stroke limiter for sanitary regulating valves.
When the signal pressure is zero, the regulating valve is either fully open or fully closed. If the processing requires a small amount of flow in the regulating valve, the handwheel can be used to achieve the purpose.
There are top-mounted and side-mounted for a handwheel mechanism. The top-mounted type can only limit the stroke in one direction. The side-mounted type, according to the requirement of processing, can be mounted on the left or right to achieve the limitation of position.
In short, the manual mechanism can improve the reliability of the operation of regulating valve especially when the regulating valve adds a bypass.
When we use regulating valve of large diameter, the use of a handwheel is very cost-effective judging from the investment costs and covered land area. So when the automatic operation is normally completed and the actuator is without failure, we must constantly add oil to prevent rust.
