Rotary valve can be divided into the following kinds according to the operation mode:
Rotary valve classified according to operating mode has the following types: manual valve, automatic valve and control valve.
1) Manual rotary valve: operated by hand, by manual actuators such as hand lever, gear, the handwheel to switch operation, including a unit can rotate 90 degrees. By operating actuator stem and flow control components to open and close valves.¡¡
2) automatic rotary valve: including an automatic actuator, automatic control or use energy from the outside to switch for the remote control valve. Generally should choose the automatic valve in the following circumstances: large valve (e.g., greater than 8 "valve), very difficult to operate the valve manually, in the midst of a toxic or other harsh environment can't adopt manual operation of valves, requirements for dealing with emergency valve must quickly close the valve; cooperate with batch formula all flow valve, etc. Automatic actuator types including hydraulic, pneumatic and electric and so on, most of the automatic rotary valve can be operated by electric and pneumatic actuators.
3) rotary valve:it can be operated under the opening of a specific operation, this kind of valve including a size according to the electrical signal to produce the corresponding corner of actuators. Butterfly valve is often used in low pressure, large diameter, not too strict with leakage control. Rotary valve is a kind of control valve, control valve also includes some straight trip valve, such as the cut-off valve, gate valve, diaphragm valve. Rotating the cut-off valve is not a control valve, because it is limited in and off.
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