COVNA Pneumatic Diaphragm Regulating Valve with Digital Display

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.
Model: pneumatic control valve
Size Range: 3/4''~8'
Pressure Range: PN16~PN100
Material: WCB, HT200、ZG25I、ZG1Cr18Ni9、ZGOCr17Ni12Mo2、1.25Cr0.5Mo、5.0Cr0.5Mo、 SCPH21、Ti

Advantages of Pneumatic Diaphragm Regulating Valve with Digital Display:

● It is cost-effective and safe to be used,which can help you save cost of the whole system and 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 Pneumatic Diaphragm Regulating Valve with Digital Display:

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%


Dimension of Pneumatic Diaphragm Regulating Valve with Digital Display:
Weight table of Pneumatic diaphragm regulating valve

 

 


Technical Parameter of Valve Body: 

  Nominal Size   DN15-DN200   Body Material   PVC, UPV, CPVC, PVDF and PPH
  End Connection   True Union, Double Union Thread   Structure   T Port / L Port
  Operating Pressure   1.0 / 1.6 MPa (10 / 16 bar)   Voltage Tolerance   ±10%
  Suitable Media   Corrosive media, Water, Air, etc   Temperature Of Media   -5~80℃ (23℉~176℉)
  Design standard   ISO, DIN, IDF, SMS, 3A   Orifice(mm)  15, 20, 25, 32, 40, 50, 65, 80, 100



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.


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Purchase Guide:

● Confirm the valve size you need. We offer this motorized PVC ball valve in 1/2in to 4in.

● Confirm the valve body material you need. We offer this motorized PVC ball valve in UPVC, CPVC, PPH and PVDF material.

● Confirm the connection standard. We offer this motorized PVC ball valve in ANSI, JIS, DIN, and UK standard.

● Confirm the pressure and working temperature. Pressure and temperature are the important points and those may affect the cost.

● Confirm the voltage you need. The right voltage could help your valve operate better.

● Tell us your medium. Different medium has different features and we will help you to select the valve basic on the medium requirements

● Confirm the actuator type you need. We have on/off type, modulating type, intelligent type, explosion-proof type, IP68 type and auto return type electric valve actuator for your project.

Any requirements please tell us like core material, sealing material, or connection standard. We could help you to custom the valve you need.

More infomation, please send message to us. Quote will be provided within 2 hours! inquiry@covna-china.com

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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