Operating mechanism of breathing valve

1 The opening and closing direction of the breathing valve shall be closed clockwise 2 Because the breathing valve in the pipe network is often opened and closed manually, the number of opening and closing turns should not be too many, even the large-diameter valve should also be within 200-600 turns 3 In order to facilitate one person's opening and closing operation, the Zui large opening and closing moment should be 240n-m under the working pressure of the pipeline 4 The opening and closing operation end of the breathing valve shall be square tenon with standardized size and facing the ground so that people can operate directly from the ground Valves with disc are not suitable for underground pipe network 5 Display panel of the opening and closing degree of the breathing valve ① the scale line of the opening and closing degree of the breathing valve shall be cast on the gearbox cover or the shell of the display panel after the direction change, all of which shall face the ground, and the scale line shall be brushed with fluorescent powder to show conspicuity; ② the material of the indicator panel needle can be made of stainless steel plate under the condition of good management, otherwise it is painted steel plate, and aluminum skin shall not be used; ③ The indicator pin shall be eye-catching and fixed firmly Once the opening and closing adjustment is accurate, it shall be locked with rivets.