COVNA Pneumatic Control Valve Series

COVNA Pneumatic Globe Control Valve is to use compressed gas as the power source, the cylinder as the actuator, and with the help of valve positioner, converter, solenoid valve, retaining valve, gas tank, gas filter and other accessories to drive the valve, realize the switch value or proportional adjustment, receive the control signal of industrial automation control system to complete the regulation of pipeline medium: flow, pressure, temperature, liquid level, etc Various process parameters. The characteristics of pneumatic control valve are simple control, rapid response, and intrinsic safety, no need to take additional explosion-proof measures.

Model: Pneumatic Control Valve
Size Range: 3/4''~8'
Pressure Range: PN16~PN100
Material: WCB, 304, 316, 316L,
WCB, HT200, ZG25I, ZG1Cr18Ni9, ZGOCr17Ni12Mo2, 1.25Cr0.5Mo, 5.0Cr0.5Mo,  SCPH21, Ti

What is Pneumatic Control Valve:
The pneumatic control valve is composed of an actuator and an adjustment mechanism. The actuator is the thrust component of the adjustment valve. It generates a corresponding thrust according to the pressure of the control signal to push the adjustment mechanism into action. The valve body is the regulating component of the pneumatic regulating valve. It directly contacts the regulating medium to regulate the flow, pressure, temperature and other process parameters of the fluid. The pneumatic control valve has the characteristics of simple control, fast response, and intrinsically safe, without additional explosion-proof measures. Pneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises.

Advantages of COVNA Pneumatic Control Valve Series:

● 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 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.

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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%


Dimension of COVNA Pneumatic Control Valve :
Weight table of Pneumatic diaphragm regulating valve:

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Factory Profile:


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Package & Shipping:
As a professional electric ball valve manufacturer, COVNA aims to provide our customers the best quality products with the most competitive pricing, on-time delivery and full warranty service with omprehensive service from start to finish, encompassing consultation through to after sales service, full support in every respect and ensure that you are accompanied at each stage of your project.

●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!

Technical Parameter of Actuators:
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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