Diameter adjust moment regulate pumping unit is based on the conventional beam pumping unit. The main part is roughly the same as the former pumping unit. The difference is there is no crank counterweight, which is applied at the end of the beam with different torques. This pumping unit changes the crank balance to the beam balance and saves energy by increasing the dynamic balance effect.

This type of pumping unit adopts the structure of walking beam and moment changing beam. By changing the position of the counterweight device in different quadrants, the maximum balancing moment and position of the counterweight device can be adjusted in a wide range.

The variable torque beam is composed of a closed box and a counterweight device. The variable torque beam is located at the end of the walking beam. The structure is simple, safe and reliable. The counterweight is composed of fixed counterweight and adjustable recombination.

Compared with conventional beam pumping units, it has the following advantages：
1. Simple structure and high reliability
Because the transmission mode and basic structure are the same with the conventional pumping unit, this type of pumping unit has the characteristics of simple structure and high reliability.
2. Simple operation and low maintenance cost
The torque transmitted by the motor and reducer of this type pumping unit is smaller than that of the pumping unit of the same specification.
3. The power saving
Because of the high dynamic equilibrium rate, the power saving effect is remarkable.
4.Convenient parameter adjustment
The pumping unit is balanced by adjusting diameter pin and weight block, which is easy to operate and safe to use.
5.Cheap
Compared with the pumping unit of the same specification, this type of pumping unit uses two lower specifications of the motor and one lower specification of the gearbox.
Compared with the traditional beam pumping unit, it has the following advantages:
1. Simple structure, high reliability
Due to its transmission mode and basic structure are the same as the conventional pumping unit, the pumping unit has the features of simple structure and high reliability.
2. Simple operation, low maintenance cost
The motor and reducer of this pumping unit transmit less torque than those of the same specification.
3. Save power
Because of the high dynamic balance rate, the power saving effect is brilliant.
4. Easy to adjust parameters
The pumping unit is balanced by adjusting the diameter pin and the counterweight block, which is easy to operate and safe to use.
5. Reduce costs
This type of pumping unit uses two lower specification motors and a lower gearbox than the same specification.