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| Media: | Gas |
| Standard: | ANSI |
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Q:what is the working principle of pneumatic diaphragm valve?
A: Pneumatic diaphragm valve is driven by compressed air to pneumatic actuator, the movement of the actuator is transmitted to the diaphragm through the connecting parts. The diaphragm moves upward or downward under the action of air pressure, thus opening or closing the valve passage. When the diaphragm leaves the valve seat, fluid can pass through the valve; when the diaphragm is pressed against the valve seat, the valve closes, preventing fluid flow. The diaphragm of this type of valve separates the fluid from the actuator, effectively preventing fluid leakage to the actuator side.
Q:What are the main components of a pheumatic diaphragm valve?
A: It mainly consists of valve body, diaphragm, bonnet, pneumatic actuator (e.g. cylinder, piston, etc.), valve stem and connecting parts. The valve body is the main part of the fluid passage, the diaphragm is used to isolate the fluid and the actuator and control the fluid on and off, the bonnet is used to fix the diaphragm and connect the actuator, the pneumatic actuator provides the power to drive the diaphragm action, and the valve stem transmits the power from the actuator to the diaphragm.
Q:What are the precautions for installation of pneumatic diaphram valves?
A: The installation location should be easy to operate and maintain, and there should be enough space around. The valve should be installed vertically, so as to ensure that the diaphragm works properly under gravity, and avoid situations such as uneven force on the diaphragm due to tilting. During installation, attention should be paid to the connection between the pipeline and the valve to ensure a tight connection and prevent leakage. At the same time, the valve should be installed correctly in accordance with the flow direction of the piping system, and the direction of the arrow should be consistent with the direction of fluid flow.
Q:what checks need to be made on the valve before installation?
A: Before installation, check whether the model and specification of the valve meet the requirements, including calibre and pressure level. Check whether the diaphragm is intact, without cracks or perforations. Also check whether the action of the pneumatic actuator is flexible, there is no stagnation phenomenon, check whether the seals of the connection parts are complete and in good condition.
Q:How to control the opening of pneumatic diaphragm valve?
A: The valve opening can be controlled by adjusting the air pressure signal of the pneumatic actuator. In the automatic control system, according to the process requirements to set the control signal (such as 4 - 20mA current signal or 3 - 15 psi air pressure signal, etc.) and the valve opening the corresponding relationship, the controller output signal to drive the pneumatic actuator, so that the valve to achieve the desired opening. The valve opening can also be changed by manual adjustment device (if available). Q: What is the operating pressure range of pneumatic diaphragm valves? A: Different models and specifications of pneumatic diaphragm valves have different operating pressure ranges, generally their operating pressure ranges from vacuum to several megapascals. In use, according to the valve's nameplate identification and product specifications to determine its allowable operating pressure range, can not exceed this range, otherwise it may lead to valve damage or leakage.
Q:how do I perform routine maintenance on pneumatic diaphragm valves?
A: Periodically check the integrity of the diaphragm for signs of deterioration, wear or damage. Check the pneumatic actuator's air source connection for leakage, and clean the valve surface and actuator regularly to prevent dust and impurities from entering. Also check the valve connections for looseness and lubricate the moving parts of the pneumatic actuator regularly (if required).
Q:what are the common filures of pneumatic diaphragm valves? how to troubleshoot?
A: Common failures include diaphragm rupture resulting in leakage,
at which point the diaphragm needs to be replaced. If the pneumatic actuator moves slowly or does not move, it may be due to insufficient air pressure, clogged air tubes, or damage to internal parts of the actuator, which requires checking the air pressure, cleaning the air tubes, or repairing the actuator. There is also the case of internal leakage of the valve, may be between the diaphragm and the seat of the foreign body or diaphragm damage, need to clean up the foreign body or replace the diaphragm to solve the problem.
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