ZJH Series Pneumatic Diaphragm Control Ball Valve
Short Description:
Pneumatic diaphragm control valve
comprises a multiple spring zero adjustable actuator, a low flow resistance sleeve and a single seat regulation valve without a lower cover. The flow capacity increases by 1/3. It’s of low center of gravity, high vibration resistance and easy to install. The performance indexes are superior to products of the same kind. The products are widely used in automatic production control systems in industries including chemistry, petroleum, light industry, power station, and metallurgy. We will try our best to provide the high-quality and high-tech pneumatic control valve for your various project for flow control. Inquiry us to get the free valve solution!
Model
Inherent Regulation Ratio: 50:1
Nominal Pressure : 1.6 / 4.0 / 6.4 MPa
Service Temperature: -10 to 180℃
Ambient Temperature:-30 to 70℃
Air Supply Pressure : 0.14 / 0.25 / 0.40 KPa
Spring Range: 20 to 100(Basic type) / 40 to 200 / 80 to 240 KPa
Benefits Of Pneumatic Control Valve:
COVNA Pneumatic Control Valves are suitable for regulating flow rate of pipelines. Pneumatic control valve is powered by compressed air, without electricity, safe and explosion-proof. The positioner receives and feedback the control signal of the industrial automation control system to complete the adjustment of the flow and pressure of the pipeline medium. Widely used in shipbuilding, power plants, food and beverage, and so on.
Features Of ZJH Series Pneumatic Diaphragm Control Valve:
- Globe valve is driven by pneumatic control which could allow your automation more easily and help you control the medium more precise
- Available in single-seat type and sleeve type for your choice
- Precise control: Pneumatic control valves offer precise and accurate control over the flow of fluids and gases
Major Technological Performance Indexes And Testing:
| 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:
Applicable fields:
This pneumatic diaphragm control valve can be widely used in the following industries:
1. Chemical industry
2. Oil and gas field
3. Power industry
4. Metallurgical industry
5. Light industry automation
The actuator on my automated valve operates, but the valve won’t turn. Why?
Most likely the valve stem or actuator coupling is broken.
Why doesn’t my valve open or close completely when the actuator operates it?
The electric actuator limit switches or the pneumatic actuator position stops are not correctly adjusted.
When I energize the solenoid on my pneumatic actuated valve, the valve won’t turn. How come?
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.
Can I buy an actuator from one manufacturer and mount it to a valve from another manufacturer?
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.
What happens if I lose power to my electric actuator in the middle of an actuation cycle?
The valve will stop somewhere between full open and close. When power is reapplied to the original circuit, the actuator will complete the cycle.
I ordered a fail open pneumatic actuated valve by mistake. I needed a fail closed one. What can I do?
To make the change just remove the actuator from the valve and turn it, or the valve stem, 90 degrees and remount the actuator.
I’ve installed my automated valve in the line, but now I don’t know if the valve is in the open or closed position. How can I find out?
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.
Do I have to have the solenoid valve that controls the air supply to my pneumatic actuator mounted right on 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.
How do I wire up my electric actuator?
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.
I’ve just installed an electric actuated valve and when I power it, it turns the valve 360 degrees and won’t shut off. What’s wrong?
The actuator is wired incorrectly (check the schematic accompanying the actuator), or the external control switch is not the correct type for the actuator.
My electric actuators cycle time is way too fast, can I slow it down?
Not unless you bought it with an optional speed control.
I just replaced a solenoid valve with an electric actuated valve and it won’t work. Why?
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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About Us
Create since 2000, We first started as a solenoid valves manufacturer. Over decades of research and development,
COVNA has become the China market leader in quarter turn actuator and automatic control valve products.
Contact Info
info@covna-china.com
Telephone
+86-0769-22763199
Mobile
+86-1355-6646018
Address
Building C, Longchang Micro-Chuang Yuan, No.26 Hangtang Street, Dongguan, China
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