Precautions for installing diaphragm valve

Precautions for installing diaphragm valve

1. The applicable regulations must be followed.

2. Before installing the diaphragm valve, carefully check whether the operating conditions of the pipeline are consistent with the scope of use specified by this valve, and clean the inner cavity to prevent dirt from jamming or damaging the sealing parts.

3. Connect the valve and pay attention to aligning the pipe.

4. For all valves, the actuator must be disassembled before the welding process is performed on the valve body.

5. When replacing the diaphragm, it is necessary to maintain the open connection between the diaphragm and the sealing surface, and then separate the diaphragm from the sealing surface.

For air-to-open function valves:

1). Vent the actuator to lift the diaphragm away from the sealing surface.

2). Disassemble the four screws on the valve body crosswise to separate the actuator from the valve seat, cut off the air source, and replace the diaphragm.

3). Vent the actuator and retract the diaphragm.

4). Align the sealing surface of the diaphragm with the valve seat, cross-install the fixing screws, and repeat the ventilation activities several times.

5). After closing the diaphragm valve for leak testing, it can be used normally.

For air-to-close function valves:

1). Cut off the air source of the actuator and lift the diaphragm away from the sealing surface.

2). Cross disassemble the screws on the valve body to separate the actuator from the valve seat, ventilate, and replace the diaphragm.

3). When the diaphragm is retracted, align the diaphragm with the sealing surface on the valve seat, and install the fixing screws crosswise.

5). Repeated ventilating activities several times, after closing the diaphragm valve for leak testing, it can be used normally.

For double-acting function valves:

1). Cut off the air source and lift the diaphragm away from the sealing surface.

2). Cross disassemble the four screws on the valve body to separate the actuator from the valve seat, cut off the air source of the lower cylinder, inflate the upper cylinder, and replace the diaphragm.

3). Inflate the lower cylinder to retract the diaphragm.

4). Align the sealing surface of the diaphragm with the valve seat, cross-install the fixing screws, and repeat the ventilation activities several times.

5). After closing the diaphragm valve for leak testing, it can be used normally.