Warning device for valve maintenance

A warning device, mounted on a valve which including a valve body, a valve seat and a valve stem;

• the warning device comprising:
• a base connected to the valve body;
• a shaft having a shaft body and a first sensing member;
• the shaft body movably received in the base with an end connected to the valve stem to drive the valve stem to rotate;
• wherein a profile of a cross-section of the shaft being passed through by the first sensing member is asymmetric along at least a radial direction;
• a sensing module having a second sensing member received in the base and corresponded to the first sensing member to detect changes in position of the first sensing member and generate a sensing signal accordingly;
• a control module, received in the base and electrically connected to the sensing module, having a receiving unit and a processing unit;
• the receiving unit receiving the sensing signal generated by the sensing module;
• the processing unit calculating a rotation data based on the sensing signal;
• and
• a warning module received in the base and signal connected to the control module to generate a warning signal according to the rotation data from the processing unit;
• wherein the base includes a second storage space and a second opening;
• the second storage space is connected to a stem packing of the valve body so that the valve stem extends into the second storage space through the stem packing;
• the sensing module further includes a pressure sensor electrically connected to the control module and extends into the second storage space through the second opening to detect changes in pressure of the second storage space and generate a pressure value signal accordingly;
• the control module calculates a pressure data based on the pressure value signal generated by the pressure sensor.

A warning device, mounted on a valve which including a valve body, a valve seat and a valve stem;

• the warning device comprising:
• a base connected to the valve body;
• a shaft having a shaft body and a first sensing member;
• the shaft body movably received in the base with an end connected to the valve stem to drive the valve stem to rotate;
• wherein a profile of a cross-section of the shaft being passed through by the first sensing member is asymmetric along at least a radial direction;
• a sensing module having a second sensing member received in the base and corresponded to the first sensing member to detect changes in position of the first sensing member and generate a sensing signal accordingly;
• a control module, received in the base and electrically connected to the sensing module, having a receiving unit and a processing unit;
• the receiving unit receiving the sensing signal generated by the sensing module;
• the processing unit calculating a rotation data based on the sensing signal;
• and
• a warning module received in the base and signal connected to the control module to generate a warning signal according to the rotation data from the processing unit;
• wherein the shaft body has a ring-shaped metal outer surface;
• the first sensing member includes a surface integrally formed on the outer surface of the shaft body and extending inward along the radial direction of the shaft body;
• the second sensing member includes an inductive position sensor corresponded to the first sensing member, surrounding the shaft body and kept a predetermined distance from the shaft body;
• at least a distance between the first sensing member and the second sensing member is greater than a distance between the outer surface of the shaft body and the second sensing member.