1. Torque limitation mechanism adjustment

Electric gate valves are used in different places due to the difference in water pressure or air pressure between the two ends of the gate (when the gate valve is closed), torque limiting mechanism can be appropriately adjusted. When used in places with low water pressure or air pressure difference at both ends of the electric gate valve gate, the torque limiting mechanism should be adjusted to a lower torque. When using the HZ series, z series or ZB series with mushroom reed and its lapped HZ series torque limiting mechanism, the adjusted torque value is required to be larger, and vice versa. The above series of adjustments are the same. When adjusting the ZD series valve electric device, remove the side cover of the box body, adjust torque limiting mechanism, loosen the tightening screw in the adjusting nut, loosen the adjusting nut, loosen the button torque spring, and put it in the most loose position. Then, tighten the tightening screw in the adjusting nut and fix the adjusting nut. Note that the top of the tightening screw must be placed in the shaft slot. If the top does not align exactly with the shaft slot, just turn the adjusting nut slightly in the direction of the compression spring and make it align with the shaft slot.

Then install the side cover and adjust the open valve. If the torque limiting mechanism ACTS, the spring is too loose to tighten until it does not act. In this way, the torque limiting mechanism can work under low torque, so as to ensure that when the electric gate valve fails due to the failure of the travel control mechanism, when the electric gate valve or other reasons overtorque, the torque limiting mechanism can operate reliably, and the motor power can be cut off to protect the valve from damage. Electric gate valves used in some places do not have to be adjusted to close too tightly, so it is better to adjust the position to a semi-circle (or one lap) after manually closing. When the electric gate valve is installed in a place with a large water pressure difference (or pressure difference), the torque limit mechanism should be adjusted to the appropriate opening and closing torque. If the outlet water gate valve installed in the water pump room is installed, after the start of the water pump, the outlet water pressure is greater when the gate valve is not opened. At this time, the larger the 121 diameter of the outlet gate valve is, the greater the torque used to open the gate valve is. In particular, when there is no pressure in the pipe, the one-way pressure on the gate plate of the gate valve is the maximum. At this time, the adjusting nut compression spring is adjusted to normally open and close the gate valve, and the torque limiting mechanism does not operate.

The electric gate valve used in the water pump room must be adjusted to the fully open and fully closed position, otherwise it is easy to damage the sealing cover of the gate valve and cause water leakage. Because the electric gate valve installed in this place is close to the water outlet of the pump, the water flow rate is high and unstable. At this time, if the gate valve is not fully opened, part of the gate plate will move forward and backward due to the impact of water flow, which will wear the sealing cover of the gate, and the water leakage will affect the service life of the valve. In addition, electric gate valve should be avoided to adjust the flow, otherwise it is easy to damage the sealing surface of gate valve. In addition, the technology of frequency conversion speed regulation is developing rapidly in recent years. The water pump flow regulation should adopt frequency conversion speed regulation technology to save energy and improve the working efficiency of water pump.

2. "open and close" position adjustment of electric gate valve

Adjust the opening and closing of the electric gate valve. According to the adjustment requirements of each manufacturer, the valve should be closed manually to the "all closed" or "all open" position. If it takes more time to manually close and open large-caliber gate valves as required, it will be difficult. A new adjustment method is introduced: if you know the stem tooth distance of the valve, it is easy to adjust the electric gate valve. The valve diameter produced in China is dn400-dn600, and the valve stem tooth distance is generally 8ram. The tooth spacing of valve stem of DN600 and above is generally 10ram. If possible, ask the manufacturer of gate valves for stem pitch. When adjusting the valve actuator, if you know the position of the gate valve in advance, and if you know that the gate valve is in the fully closed position, adjust the "fully closed" position first. First, manually turn the gate valve in the open direction, such as half or one turn on the stem.

Then send the power to press the "on" button. Check the steering. If the steering of the stem is consistent with that of the stem when the valve is manually opened after pressing the open valve button, it indicates that the phase sequence of the motor is consistent with the direction of the valve's electrical controller. At this point, the stroke control mechanism of the gate valve can be adjusted to the full closed position. After the full closed position is adjusted, the full open position of the gate valve can be adjusted. At this point, when opening the gate valve, count the number of the number of turns on the stem of the gate valve to know whether the "full open" position. If it is an electric gate valve of DN500, its stem tooth distance is 8ram, and the stem turns once to open 8ram. When fully open, the gate valve plate shall move up 500ram, so the stem shall rotate 500/8 =62 when fully open. Five laps. At this point, press the open valve button to 63 circles and the valve will reach the "all open" position, adjust the stroke controller of the valve electric device, and make the "all open" position of the micro-switch action can be. After that, the electric gate valve can be closed, opened for inspection, and the adjustment ends. If the electric gate valve is in the open position before adjustment, the open position should be adjusted first, as described above.

The article comes from: http://www.sz-sport.com