Selection of two-way and three-way proportional integral electric control valve for Zhejiang Baolun central air conditione

Zhejiang Baolun Valve Co
, Ltd
specializes in the production of central air conditioning electric control valve control valve
Key points for selection of electric control valve:
Key points: 1
It is used for hot water, cold water and low-pressure steam
2
Medium temperature: 1-10 ℃ to 180 ℃
3
0
03 of the leakage Kv value
4
Pressure range: 16bar
5
Diameter: dn15-500
5
The flow coefficient Kv value is 10-360
6
Connection method: screw port and flange
7
Pressure: PN16
8
Valve body material: brass, ductile iron, cast steel

1
The main control parameters for electric control valve are: nominal diameter, design nominal pressure, allowable temperature range of medium, flow coefficient, etc

2
For strict occasions where the flow is required to be in positive proportion to the opening height, a special regulating valve shall be selected
Ball valve and butterfly valve can be selected for rough adjustment

3
The sealing performance of valves is one of the main indexes to evaluate the quality of valves
The sealing performance of the valve mainly includes two aspects, namely, internal leakage and external leakage
Internal leakage refers to the sealing degree of the medium between the valve seat and the closing part
External leakage refers to the leakage of the valve stem packing, the leakage of the middle gasket and the leakage of the valve body caused by casting defects
Leakage is not allowed

4
The ideal flow characteristics of the regulating valve include quick opening, parabolic, linear and equal percentage
The regulating valve with appropriate flow characteristics shall be selected according to the actual working flow characteristics

5
The nominal diameter of the regulating valve shall be determined according to the required valve flow capacity
The nominal diameter of regulating valve shall not be too Da or too small
Over Da, the engineering cost is increased, the valve is in a low percentage range, the adjustment accuracy is reduced, and the control performance becomes worse
If it is too small, the system resistance will increase, and even when the valve is 100% open, the system still cannot meet the set capacity requirements

6
Regulating pressure difference and shut-off pressure difference of regulating valve: for regulating valve, the allowable regulating pressure difference and shut-off pressure difference are important indicators for its type selection
If the actual differential pressure is higher than the allowable regulating differential pressure of the regulating valve, the valve will not be adjusted accurately, which will seriously damage the valve actuator