Working principle of Danfoss solenoid valve, exploded view of Danfoss solenoid valve body

Danfoss solenoid valve EVR series is a direct-acting or servo-type solenoid valve suitable for liquid pipes, suction and exhaust lines of fluorinated refrigerant systems. Features of Danfoss solenoid valves: 1. Suitable for various occasions of refrigeration, freezing, and air conditioning devices;2. Provide normally closed (NC) type and normally open (NO) type;3. Wide selection of AC and DC solenoid valve coils;4. Suitable for all fluoride refrigerants;5. Designed to withstand medium temperature up to 105 °C;6. MOPD (maximum operating pressure difference) with 12W coil solenoid valve up to 25 bar;7. The maximum bell mouth connection can Up to 5/8 inches;8. Welding connection up to 2 1/8 inches;9. Extended pipe for welding connection, easy to install, no need to disassemble and assemble the valve during welding;10. EVR can provide welding, bell mouth, method Lan connection. Exploded view of Danfoss solenoid valve body. There are two design principles of Danfoss solenoid valve EVR series: 1. Direct-acting EVR 2 and EVR 3 are direct-acting. When the armature (16) moves upward into the coil magnetic field, the valve opens directly to maximum flow. That is, the valve actuates at a minimum pressure differential of 0 bar. The valve pad (18) is mounted directly on the armature (16). The inlet pressure acts on the armature and valve pad from top to bottom. Therefore, when the coil is de-energized, the valve closes due to inlet pressure and spring force. 2. Servo-type EVR 6 and EVR 22 are servo-type, equipped with a "floating" diaphragm (80). The stainless steel pilot orifice (29) is located in the center of the diaphragm. The pilot valve gasket (18) is directly installed on the armature (16). When the coil is de-energized, the main flow port and the pilot flow port are closed. Under the action of the armature spring force and the pressure difference between the inlet and outlet sides, the pilot inlet and main inlet remain closed. When the coil is energized, the armature is pulled into the magnetic field and the pilot orifice opens. This releases the pressure above the diaphragm, which means that the space above the diaphragm is connected to the valve outlet. Under the action of the pressure difference between the inlet side and the outlet side, the diaphragm leaves the main flow port, and the main flow port opens to the maximum flow rate. Therefore, a minimum pressure differential is required to open and keep the valve open. For EVR 6 and EVR 22 valves this minimum pressure differential is 0.05 bar. When the current is cut off, the pilot orifice is closed. Through the balance hole (73) in the diaphragm, the pressure above the diaphragm rises to be equal to the inlet pressure, and the diaphragm closes the main inlet. EVR 25, EVR 32 and EVR 40 are servo-operated piston valves. When the coil is de-energized, the valve closes. Under the action of the pressure difference between the inlet and outlet sides of the valve and the compression spring (76), the servo piston (80) and the main valve pad (84) are tightly pressed against the valve seat. After the coil is energized, the pilot orifice (29) opens. This relieves pressure on the piston on the spring side of the valve. The pressure difference causes the valve to open. A minimum pressure differential of 0.2 bar is required for the valve to be fully open. Function 24 of EVR(NO) is the opposite of EVR(NC), which is to open when the spring is de-energized. EVR (NO) is only servo type. Danfoss solenoid valve working principle The input signal (set value) determines the pilot pressure that drives the main valve core. The LVDT sensor detects the position of the main spool and the electronic component generates a feedback signal. The electronic control system controls the solenoid valve based on the deviation between the set signal and the feedback signal, thereby changing the pilot pressure and driving the main valve core to the correct position. The above is the working principle of Danfoss solenoid valve, and the exploded view of Danfoss solenoid valve body is introduced. If you want to know more related information, please log in to Sunway Pneumatics www.diancifa.cc to view it.