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Performance requirement:
1. Redirection performance Under the specified operating conditions, the solenoid valve can reliably change after energizing, and can be reliably reset after power off.
2. Pressure loss The pressure loss of the electromagnetic reversing valve consists of the flow loss and throttling loss caused when the liquid flow flows through the valve of the electromagnetic reversing valve.
3. Internal leakage The internal leakage amount of the electromagnetic reversing valve refers to the leakage amount from the high pressure cavity to the low pressure cavity in different working positions under the prescribed working conditions.
4. Change-direction and reset time The time required from the solenoid power up to the termination of the valve movement, the reset time is from the electromagnetic power off to the time required for the Plastic solenoid Valve movement to return to the initial position.
5. Change frequency Maximum number of conversions allowed per unit of time.
6. Service life The solenoid valve is used when the main parts and components are damaged, cannot normal commutation and reset action, or the main performance index is significantly worse than the number of commutation times experienced by the specified indicators.
Common fault: the PTFE Solenoid Valve is composed of solenoid coil and magnetic core, is a valve body containing one or several holes. When the coil is energized or powered off, the core operation causes the fluid to pass through the valve body or to be cut off to change the direction of the fluid. The solenoid component of the plastic solenoid valve consists of fixed iron core, moving iron core, coil and other components; the valve body part is composed of sliding valve core, sliding valve sleeve, spring base, etc. The solenoid coil is directly attached to the valve body, which is enclosed in the sealed tube for a simple, compact combination. We commonly used in the solenoid production valve two three, two four, two five and so on. Here first to say the meaning of two: for the solenoid valve is charged and power loss, for the control of the valve is open and close. The fault of PVC Solenoid Valve will directly affect the action of switching valve and regulating valve. Common faults of solenoid valve does not operate, which should be investigated from the following aspects:
1. The solenoid valve connector is loose or the wire head falls off. The solenoid valve should not be electric and can be tightened. 2. If the Brass Solenoid Valve coil is burned out, the wiring of the solenoid valve can be removed and measured with a multimeter. If the open circuit occurs, the solenoid valve coil is burned out. The reason is that the coil is damp, causing poor insulation and magnetic leakage, causing the current in the coil is too large and burned, so to prevent rain into the solenoid valve. In addition, the spring is strong, the reaction force is too large, the coil turns are too little, and the suction is not enough can also make the coil burned. During emergency handling, the manual button on the coil can be hit from "0" to "1" to make the valve open.
2. The solenoid valve is stuck: the coordination gap between the slide valve sleeve and the valve core is very small (less than 0.008mm), which is generally a single assembly, when there are mechanical impurities brought in or too little lubricating oil, it is easy to get stuck. The treatment can be used with a wire from a small hole in the head to bounce back. The fundamental solution is to remove the solenoid valve, take out the spool and spool sleeve, clean with CCI4, so that the spool in the valve sleeve flexible action. When disassembly, we should pay attention to the assembly sequence and external wiring position of each component, so as to reassemble and correct wiring, and also check whether the oil spray hole is blocked and whether the lubricating oil is sufficient. 4. Air leakage: air leakage will cause insufficient air pressure, making it difficult to open and close the forced valve,The reason is the sealing gasket damage or wear of the slide valve caused by several cavity gas channeling. When dealing with the failure of the solenoid valve of the switch system, the appropriate time should be selected, and then it should be processed when the solenoid valve is in the power loss. If the process is not finished in a switch gap, the switch system can be suspended and handled calmly.
Common application: the solenoid valve is the solenoid coil electrified after generating magnetic force to overcome the spring pressure drives the valve core action, a solenoid coil, simple structure, cheap price, can only realize the switch.
1. Solenoid valve: used for the switch control of liquid and gas pipeline, it is a two-bit DO control. Generally used for the control of small pipes.
2, Solenoid valve: can only be used as a switch quantity, is a DO control, can only be used for small pipe control, common in DN50 and below the pipeline, very little up.
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