Hydraulic balance equipment can be divided into static and dynamic balance equipment. Static hydraulic balancing device are mainly static balance valve, dynamic hydraulic balance device mainly dynamic flow balance valve, dynamic differential pressure control valve, dynamic balance electric two-way valve, combined or integrated dynamic balance electric regulating valve.
The function of static balance valve in water system is to eliminate the static hydraulic imbalance and to realize the system to achieve the static hydraulic balance. Dynamic hydraulic balance equipment in the water system in the role is to eliminate the dynamic hydraulic imbalance, so that the system to achieve dynamic hydraulic balance.
1 static balancing valve
Static balance valve, also known as manual valve or manual valve, is a flow measurement and regulation of the valve, the operation mode is manual adjustment. The principle of the balance valve for variable flow orifice plate, and with off function. By measuring the valve before and after the measurement of the pressure drop, combined with the opening of the valve, the valve can be converted into the valve regulated flow. Static balancing valve is essentially a clear "flow - pressure difference - opening" relationship, a clear adjustable opening indicator as well as a good adjustment of the characteristics of the damping adjustment element.
2 dynamic flow balance valve
Dynamic flow balance valve, also known as self operated flow control valve, constant flow balance valve, is a certain pressure difference between the body and the body can automatically maintain the flow of the pipeline is always the same.
Its working principle: q=kv tick] P. through change of balance valve spool of the flow area to accommodate changes before and after the valve pressure difference (as shown in Figure 1), so as to achieve the purpose of flow control. That is, in a certain pressure difference between the valve inlet flow can ensure that the flow is constant. It is equivalent to a partial resistance variable throttle element, the element is composed of a variable flow area of the valve and high precision (5%) spring and support device. The function of the pressure difference of the spring automatically controls the size of the flow area of the valve, thereby making the flow of the valve constant. The size of the flow value can be customized according to system requirements.
3 dynamic pressure control valve
Dynamic differential pressure control valve, also known as self operated pressure control valve, a pressure differential valve, dynamic pressure balance valve, and its working principle:] (P = q/Kv), 2. The valve body can be set pressure value, through adjusting the valve opening can automatically system between the two key points of pressure difference is constant in the set pressure value. Dynamic differential pressure control valve is shown in figure 2.
The dynamic pressure difference control valve is designed based on the combination of the spring and diaphragm. Spring pull the balance of the double spool "2" open the valve, the pressure difference AB is applied to the diaphragm "3" to produce a force that is opposite to the spring. The pressure A is transmitted to the pressure difference control valve by means of a capillary connected to the measuring valve; the pressure B is transmitted from the inner or the outer to the other side of the diaphragm. When the pressure difference between the AB function on the diaphragm pressure greater than the spring force, the valve began to press the proportion of small, until to find a new equilibrium position. In this way, the pressure difference control valve has an additional pressure drop, limiting the pressure difference] pl (through the secondary loop pressure difference) increase.
4 dynamic balance electric two way valve
Dynamic balance electric two-way valve has the function of dynamic balance and electric switch, when the valve is opened, it can dynamically the actual pipe flow is constant in the design flow value, are not influenced by the pressure fluctuation in the system.
5 combined or integrated dynamic balancing electric control valve
Combination type dynamic balancing valve is a combination of dynamic differential pressure balance valve and electric control valve, one type of dynamic balancing valve is integrated with the dynamic differential pressure balance valve and the electric control valve. It has dynamic balance function, which can dynamically balance the pressure fluctuation of the system, so that the flow through the pipeline is not affected by the pressure fluctuation of the system, but also has the electric adjustment function.