Aug. 16, 2021
Does valve switch still need to be taught? Many people dismiss it, but often the simplest things are also the easiest to make mistakes. For the operators in the plant, a small mistake of their own may pose a danger to themselves. So for your own safety, you must pay attention to every detail. Correct operation is the guarantee of life.
The valve is the control component in the fluid conveying system. It has the functions of cut-off, regulation, diversion, prevention of reverse flow, stabilization, diversion or overflow, and pressure relief.
Generally speaking, the valve is basically closed clockwise and opened counterclockwise, or called left open and right closed.
Because most people are accustomed to using the right hand, it is easier to turn clockwise than counterclockwise when using the right hand. Therefore, it is more reasonable to turn the switch counterclockwise to open and clockwise to close in terms of energy-saving or safety.
In addition, most of the screws used in valve materials in our country are right-handed, which is convenient for processing.
Like the one with a hand-wheel, there will be a direction arrow or O→S logo on it (O is on, S is off).
There are really exceptions. For example, some special valves such as spool valves and butterfly valves may be opened clockwise and closed counterclockwise due to the installation position and other reasons. For another example, the pressure reducing valves of oxygen cylinders, hydrogen cylinders, and nitrogen cylinders are opened clockwise and closed counterclockwise.
The high-pressure oxygen cylinder mouth angle valve opens clockwise and counterclockwise to close; the pressure at the outlet pressure reducing valve of the high-pressure oxygen cylinder increases clockwise, and the pressure decreases counterclockwise (closed).
Special valves are generally reversed, and this needs to be paid attention to when opening and closing. Due to the improper installation location, the operator must pay attention to these details. Details determine success or failure, not carelessness. Generally, special valves are marked with the switching direction in obvious positions, and in some places, relevant operating procedures are posted on special valves to prevent misoperation.
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