What is the meaning of LSO in the nameplate of pneumatic three-way regulating butterfly valve? 4.2 Configuration of manual mechanism When the air source signal or electrical signal fails, or when the main components of the actuator (diaphragm, spring yellow, etc.) are damaged, it is necessary to change the automatic operation to manual operation, and rotate the hand wheel to maintain the adjustment function of the butterfly valve; On the other hand, this mechanism can also be used as the limit of butterfly valve travel. When the signal pressure is zero, the butterfly valve is either fully open or fully closed. If the process requires a small amount of flow, the handwheel can be used to achieve the purpose. The hand wheel mechanism can be top mounted and side mounted. The top mounted type can only limit the travel in one direction. If the side mounted type is selected for selection or installation, it can be installed on the left or right side according to the process requirements to achieve limit. In a word, the manual mechanism can improve the reliability of butterfly valve operation, especially when adding a bypass to the butterfly valve platform. When using a butterfly valve with a larger diameter, it is cost-effective to use the handwheel mechanism from the investment cost or floor area. Therefore, when the automatic operation is completed normally and the actuator is free from failure, since the manual mechanism is not used, it is often necessary to add oil for rust prevention.
、 If you want to store the pneumatic butterfly valve for a long time, you should have a special place at this time. Although it is not necessarily a completely independent warehouse, we must ensure that this space is relatively independent, and it is better not to store together with other products in chaos. Such a lot of equipment is not only difficult to find, but also has some impact on the quality itself. The problems in this aspect are very practical. Finding a relatively independent space and storing these devices independently is the key.
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