Advantages of COVNA Single Seat Pneumatic Globe Control Valve:
● It is cost-effective and safe to be used,which can help you save cost of the whole system COVNA Single Seat Pneumatic Globe Control Valved maintenance.
● It has a simple structure and a big torque, explosion-proof with short actuating times,optimized actuating forces and reliable tight sealing.
● It can perfectly avoid problems of friction, corrosion, and emissions.
● It is of low center of gravity, high vibration resistance and easy to install.
● Simple to control, rapid response, and intrinsic safety, no need to take additional explosion-proof measures.
● Fluid channels in a s- shaped streamline, small pressure drop loss large flow, wide adjustment range, high precision flow .
Working Principle Of COVNA Single Seat Pneumatic Globe 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 Parameters of Valve Actuator :
| Nominal Size DN (mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | ||||
| 10 | 12 | 15 | 20 | ||||||||||||||
| Rated Flow Coefficient CV | High accuracy flow characteristic clack | 1.6 | 2.5 | 4.0 | 6.3 | 10 | 17 | 24 | 44 | 68 | 99 | 175 | 275 | 360 | 630 | 900 | 1440 |
| High capacity flow characteristic clack | 1.8 | 2.8 | 4.4 | 6.9 | 11 | 21 | 30 | 50 | 85 | 125 | 200 | 310 | 440 | 690 | 1000 | 1600 | |
| Rated Stroke(mm) | 10 | 16 | 25 | 40 | 60 | 100 | |||||||||||
| Effective Diaphragm Area cm2 | 280 | 400 | 630 | 1000 | 1600 | ||||||||||||
| Inherent Regulation Ratio | 50:1 | ||||||||||||||||
| Nominal Pressure MPa | 1.6 / 4.0 / 6.4 | ||||||||||||||||
| Sevice Temperature | -100~-60℃; -200~-100℃; -250~-200℃ | ||||||||||||||||
| Ambient Temperature | -30~70℃ | ||||||||||||||||
| Air Supply Pressure KPa | 0.14 / 0.25 / 0.40 | ||||||||||||||||
| Spring Range KPa | 20~100(Basic type) / 40~200 / 80~240 | ||||||||||||||||
| Connection Thread | G1/4" , M16X1.5 | ||||||||||||||||
Technical Parameter of Valve Body:
1. Major performance indexes shall be as shown in below table
2. Testing shall be conducted according to the specification of GB/T4213-92
| Serial No. | Technical Performance | Without Positioner | With Positioner |
| 1 | Basic Error | ≤±5% | ≤±1% |
| 2 | Return Difference | ≤3% | ≤1% |
| 3 | Dead Zone | ≤3% | ≤0.4% |
| 4 | Leakage | ZJHP Type:≤1X10-4Rated FlowZJHM Type:≤1X10-3 Rated Flow | |
| 5 | Rated Flow Coefficient | ≤±10% | |
| 6 | Inherent Flow Characteristic | Slope±30% | |
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●22 years manufacturer of actuated valves
●Mass customaztion acceptable. 3 production base, large stock,
●Short lead time, same day shipping.
●German imported manufacturing facilities, 100% Q.C passed before shipping, quality assured.
●Industrial standard 1 year (12 months) warranty.
●ISO 9001 certificated, with extra certifications include CE, TUV, RoHS, SGS, BV, explosion & fire safe.
●OEM / ODM service available. Can do JIS 5K / 10K, ANSI 150lb / 300lb / 600lb / 900lb standard.
●More infomation, pls send message to us. Quote will be provided within 2 hours!
| 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 | ||
| Rated Strock(mm) | 10 | 16 | 25 | 40 | 60 | 100 | |||||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||||||||
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