Electric explosion-proof cast steel butterfly valve for coal mines

DEC1H-1.6C DN200Electric explosion-proof cast steel butterfly valve for coal minesIt is composed of high-quality sealed butterfly valves and mining electric actuators. The structural forms of butterfly valves include triple eccentric structure and single eccentric structure, and the sealing forms include metal seal and soft seal structure. There are two types of connection: flange type and clamp type. When the temperature is below 150 degrees, a PTFE sealed butterfly valve can be used. For high temperature conditions, a three eccentric hard seal valve body can be used. The valve body is designed according to the national standard for isolation and explosion prevention, and an explosion-proof electric actuator made of an explosion-proof shell is used. The explosion-proof mark is Exd Ⅱ BT4Gb butterfly plate with a streamlined design, which reduces fluid resistance loss.

DEC1H-1.6C DN200Electric explosion-proof cast steel butterfly valve for coal minesInstallation precautions

1. The installation form of this electric actuator has no principle requirements, but the recommended installation form is when the motor is in a horizontal state and the electrical box cover is in a horizontal or vertical upward state, which is beneficial for lubrication, debugging, maintenance, and manual operation;

2. During installation, the space required for maintenance and inspection personnel to disassemble each component should be ensured;

3. The axial clearance between the installation and valve connection teeth should not be less than 1-2mm;

4. When used for open stem valves, the extension of the valve stem should be checked to ensure that it matches the length of the valve stem sheath;

5. During installation, disassembly, and debugging, the sealing surface, sealing components, and explosion-proof surface of the explosion-proof electric actuator should not be damaged, and anti rust oil should be applied to the explosion-proof surface;

6. When disassembly is required, the manual handwheel should be rotated several times before proceeding with the valve slightly open;

7. Before installation, check whether the explosion-proof mark on the nameplate is consistent with the installation environment;

8. The grounding screw on the junction box must be reliably grounded with a grounding wire;

9. The strength of the connecting screws between the electric device and the valve should be grade 8.8;

10. When lifting electric devices, a reasonable lifting position should be selected to avoid falling, bumping, and other phenomena;

11. Open the junction box, use a wrench to unscrew the compression nut of the cable entry device, firmly connect the cable to the terminal block in the junction box, confirm that there are no errors, cover the junction box with the top cover, and tighten the fastening screw. The terminal connection should be secure, and the wire should be clamped with an elbow according to the method shown in Figure 10. The junction box has 4 entry devices, 1 for motor power cables and 3 for control cables. The power cables used must have a ground wire and be connected to the grounding terminal on the junction panel