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2. Since the breathing valve in the pipe network is often manually opened and closed, the number of opening and closing revolutions should not be too much, that is, the large diameter valve should also be within 200-600 rpm.
3. In order to facilitate a person's opening and closing operation, under the condition of pipeline pressure, the large opening and closing torque of Zui should be 240N-m.
4. The opening and closing operation end of the breathing valve should be square and standardized in size and facing the ground so that people can operate directly from the ground. Valves with discs are not suitable for underground pipe networks.
The opening and closing degree of the valve breathing display panel â‘ breathing valve opening and closing degree of the scale line should be cast on the display after the disc housing cover or change the direction of transmission, all for the ground wire brush on the phosphor scale to Show eye-catching;
2 indicates that the material of the disc needle can be made of stainless steel when the management is good, otherwise it is painted steel, do not use aluminum skin;
3 indicates that the disc needle is conspicuous and securely fixed. Once the opening and closing adjustment is accurate, it should be locked with rivets.
Operating valve of the breathing valve
1. The opening and closing direction of the breathing valve should be closed clockwise.