Automatic adjustment and manual operation in the American standard valve

As the main valve type, the American standard valve can be said to be a relatively common device. It is used in many pipeline equipment or other imported equipment. As a valve manufactured according to the American standard, There are two types of valve devices, manual operation and automatic adjustment. The automatic adjustment valve is manufactured by using a combination of an actuator and a valve. This type of American standard shut-off valve uses energy to adjust the valve components. The valve can realize fully automated operation in the pipeline, and adjust the flow of the medium in it.
As another manual valve, the size of its handle and hand wheel are designed according to normal people. Therefore, it is stipulated in the use of the valve: the operator is not allowed to open and close the valve with the help of a lever and a long wrench. At the same time, the handle length and the diameter of the handwheel are less than 320mm, only allowed to operate by one person; for the handwheel with a diameter equal to or more than 320mm, two people are allowed to operate together, or one person is allowed to operate with an appropriate lever (generally less than 0.5m in length). However, diaphragm valves and non-metal valves are strictly prohibited to operate with levers or long wrenches, and do not apply excessive force or force to close the valves.