Working Principle Of Pneumatic Control Valve:
By receiving the control signal pressure output by the standard electric signals of the regulator(via electricity-air positioner or electricity-air converter), the valve opening is changed, so as to change the flow of the medium to be regulated and then allow parameters such as flow, pressure, temperature and liquid level to be regulated. As a result, the production process automation is achieved.
After the extraneous pneumatic pressure signal is input into the diaphragm chamber, it will act on the diaphragm to produce thrust. The thrust them compress the spring pack, and move the push rod, which drives the spindle to open(close) of the valve clack until the balance is achieved between the thrust and reaction of the compressed spring pack and the clack is in a stable position of the stroke. It is concluded from the above principle. There is a definite proportional relation between the clack and the input pressure signal.
Technical Parameter Of Pneumatic Control Valve:
|Nominal Diameter||G 3/4″||20||25||40||50||65||80||100||150||200||250||300|
|Valve Seat Diameter||3 4 5 6 7 8||10||12||15||20||20||25||25||32||40||32||40||50||40||50||65||50||65||80||65||80||100||100||125||150||125||150||200|
|Rated Flow Coefficient Cv||High Accuracy Flow Characteristic Clack||0.08 0.12 0.20 0.32 0.50 0.80||1.8||2.8||4.4||6.9||6.9||11||11||17.6||27.5||17.6||27.5||44||27.5||44||69||44||69||110||69||110||176||176||275||440||275||440||690||1000||1600|
|High Capacity Flow Characteristic Clack||1.6||2.5||4||6.3||6.3||10||10||16||25||16||25||40||25||40||63||40||63||100||63||100||160||160||250||400||250||400||630||900||1440|
|Effective Diaphragm Area (cm2)||220||350||560||900||1400|
|Inherent Regualtion Ratio||50:1|
|Nominal Pressure MPa||0.16 1.6 4.0 6.4 (ANSI125 150 300 600LB)(JIS10 16 20 30 40K)|
|Sevice Temperature||-20 to 200℃ -40 to 250℃ -40 to 450℃ -60 to 450℃|
|Ambient Temperature||-40 to 85℃|
|Air Supply Pressure KPa||0.14(0.25 0.4)|
|Spring Range KPa||20 to 100(40 t o200 80 to 40 20 to 60 60 to 100)|
|Connection Threaded||Female Thread M10×1|