Manual actuator only automated action is difficult when

For example, automatic control input signal failure or actuator casing head leak, and sometimes in the process of the production process on Parking stage, the control system has not been cut automatic operation, then also need to use the manual actuator control valve operation.
The main purpose of the manual implementing agencies are as follows.
1 in conjunction with the automatic actuator for the failure of the automatic control downgrade operations, improve the reliability of the control system.
2 as a control valve stop means to limit the degree of opening of the valve, to prevent accidents to occur. Example, some valves require normal the papermaking slurry preparation process, there is a certain degree of opening, for discharging the crude residue.steam solenoid valves
Save control valve bypass valve. Unimportant control system when the pipe diameter is larger, can be performed manually agencies alternative bypass valve to reduce investment costs, reduce the installation space.
4 for opening, stopping the process manually.
The manual actuator by hand wheel, gear and connected devices. Top-loading and side-mounted installation location can be divided into two categories. Top mounted manually perform the handwheel is installed at the top of the automatic actuator, screw gear connected to the the automatic actuator rod (or film head board). During normal operation, the handwheel exit, with a fastening nut locking, can be used as the highest bit of the restriction device of the valve position. When the need for manual operation, loosen the fastening nut, turn the hand wheel and automatic actuator push rod is connected, which can move the putter, change the valve opening. Positive role and counterproductive automatic actuator with manual actuator connection, but the role of the implementing agencies need to consider a manual the implementing agencies transmission rod seal.mini solenoid valve