COVNA Products

ZJHM Series Top Guide Sleeve WCB Pneumatic High Temperature Control Valve

ZJHM Series Top Guide Sleeve WCB Pneumatic High Temperature Control Valve, which is a low flow resistance control valve, multi spring actuator of low height, light weight, simple equipment. High temperature pneumatic control valve flow channel was streamlined S, the control valve has the advantages of compact structure, light weight, flexible action, small pressure drop loss, valve capacity, flow characteristics of precision, convenient maintenance, High temperature pneumatic control valve regulating mechanism adopts balanced valve plug valve structure, has good stability, not easy to vibration, low noise the temperature sensitivity, small. High temperature pneumatic control valve is especially suitable for leakage requirements is not high, high temperature.

Port size：DN15-DN300
Pressure：PN10-PN64 CL150-CL600
Medium：Water,steam,oil,etc.
Temperature :100～450℃
Body material：WCB,WC6,WC9,CF8,CF8M,etc.

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Advantages of ZJHM Series Top Guide Sleeve WCB Pneumatic High Temperature Control Valve:

● 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.
● Especially suitable for leakage requirements is not high, high temperature

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Working Principle Of high temperature 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 a thrust. The thrust then 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 ofthe compressed spring pack and the clack is in a stable position of the stroke.It’s concluded from above principle, There’s 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

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Performance of High Temperature Pneumatic Control Valve:

High temperature pneumatic control valve
Flow characteristic		 Linear, percentage, quick open
Allowable range 50: 1 (CV<6.3 30: 1)
Rated Cv value Percentage CV1.6~630 ，linear CV1.8~690
Pneumatic control valve Allowable leakage Metal seal:  IV grade（0.01% rated capacity）
Leakage standard:  GB/T 4213
High temperature pneumatic control valve Performance
Intrinsic error % ±1.5
Return difference, % ≤1.5
Dead zone, % ≤0.6
Difference from beginning to end point, % ±2.5
Rated travel difference, % ≤2.5

Dimension of ZJH Series Pneumatic Diaphragm Control Globe Valve:
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Weight table of Pneumatic diaphragm regulating valve
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Company Profile:
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Factory Profile:
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Company Certificates:
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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.

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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!

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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The actuator on my automated valve operates, but the valve won’t turn. Why?

Most likely the valve stem or actuator coupling is broken.

The electric actuator limit switches or the pneumatic actuator position stops are not correctly adjusted.

Probably because there is no air pressure to the solenoid or dirt has jammed it. Also, debris might be trapped inside the valve. Or, the air pressure is not sufficient to operate the actuator. Remember: measure air pressure at the actuator, not at the compressor.

Maybe. First, be sure that the actuator torque output is sufficient to turn the valve reliably. Second, you will have to fabricate a custom mounting bracket and coupling to connect the actuator to the valve.

The valve will stop somewhere between full open and close. When power is reapplied to the original circuit, the actuator will complete the cycle.

To make the change just remove the actuator from the valve and turn it, or the valve stem, 90 degrees and remount the actuator.

Remove the actuator from the valve and check the valve stem. Most ball valves have stem flats at right angles to the flow when the valve is in the off position. On butterfly valves check the stem flow arrow marking.

Remove the actuator from the valve and check the valve stem. Most ball valves have stem flats at right angles to the flow when the valve is in the off position. On butterfly valves check the stem flow arrow marking.

Check the electric wiring schematic that came with the actuator for the correct hookup. Sometimes a copy is inside the actuator cover. If it is missing, don’t guess about the connections. Call the manufacturer for a schematic.

The actuator is wired incorrectly (check the schematic accompanying the actuator), or the external control switch is not the correct type for the actuator.

Not unless you bought it with an optional speed control.

Actuators and solenoid valves require different types of electrical control switches. SPDT for actuators, SPST for solenoids. Check the actuator wiring schematic for the correct wiring and switch type.

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