Italian ATOS DHI series solenoid valve principle

Brand

ATOS/Italian Atos

Flow Direction

Other

3C Valve Category

Industry

Application Areas

Food/Agricultural Products, Mining, Road/Rail/Shipping, Comprehensive

ATOS Solenoid Valve DHI Series Principle

ATOS Solenoid Valve Principle: When energized, electromagnetic force opens the pilot orifice, causing a rapid drop in pressure in the upper chamber. This creates a pressure differential around the closing element, with higher pressure at the bottom and lower pressure at the top. The fluid pressure pushes the closing element upwards, opening the valve. When de-energized, spring force closes the pilot orifice. The inlet pressure quickly creates a pressure differential around the closing element through the bypass orifice, with lower pressure at the bottom and higher pressure at the top. The fluid pressure pushes the closing element downwards, closing the valve.

ATOS Solenoid Valve Selection Criteria:

1. Select the solenoid valve based on pipeline parameters: nominal diameter (DN) and connection method.

1) Determine the nominal diameter (DN) based on the inner diameter of the pipeline or flow requirements.

2) For connection methods, generally, >DN50 requires a flange connection; ≤DN50 can be freely selected according to user needs.

2. Selection of Solenoid Valves Based on Fluid Parameters: Material and Temperature Group

1) Corrosive fluids: Corrosion-resistant solenoid valves and all-stainless steel valves are recommended; Ultra-clean edible fluids: Food-grade stainless steel solenoid valves are recommended;

2) High-temperature fluids: Solenoid valves made with high-temperature resistant electrical and sealing materials should be selected, and piston-type valves are preferred;

3) Fluid state: Fluids can be gaseous, liquid, or mixed, especially for diameters greater than DN25, which must be clearly distinguished;

4) Fluid viscosity: Generally, any viscosity can be selected below 50 cSt. If the viscosity exceeds this value, a high-viscosity solenoid valve should be selected. DHI-0612/A-X 24DC

DHI-0613/A-X 24DC 23

DHI-0613/WP-X 230AC

DHI-0613-X 230/50/60AC

DHI-0613-X 24DC

DHI-0751/2/WP-X 24DC

DHI-0751/2-X 110/50/60AC 23

DHI-0751/2-X 230/50/60AC

DHI-0751/2-X 24DC

DHI-0630/2/A-X 24DC 20

DHI-0631/2/A-X 24DC 20

DHI-0631/2/L1-X 24DC 20

DHI-0631/2-X 24DC

DHI-0639/O-X 24DC 20

DHI-0710-X 24DC 20

DHI-0711-X 24DC

DHI-0713-X 24DC 20

DHI-07191-X 24DC

DHI-0750/2-X 24DC 20

ATOS solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation used to control fluids. They are actuators, not limited to hydraulic or pneumatic systems. They are used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, ensuring both precision and flexibility. There are many types of solenoid valves, each playing a different role in the control system. Commonly used types include check valves, safety valves, directional control valves, and speed control valves.

ATOS solenoid valves consist of an electromagnetic coil and a magnetic core, and the valve body contains one or more orifices. When the coil is energized or de-energized, the rotation of the magnetic core causes fluid to flow through the valve body or be cut off, thus changing the fluid direction. The electromagnetic components of a solenoid valve consist of a fixed iron core, a moving iron core, and a coil; the valve body consists of a spool, a sleeve, and a spring base. The solenoid coil is directly mounted on the valve body, which is enclosed in a sealing tube, forming a simple and compact assembly. Commonly used solenoid valves in production include 2-position 3-way, 2-position 4-way, and 2-position 5-way valves. Here, we'll first explain the meaning of "2-position": for a solenoid valve, it means energized and de-energized; for the valve it controls, it means open and closed.

A malfunction of an ATOS solenoid valve will directly affect the operation of switching and regulating valves. Common malfunctions include the solenoid valve not operating. The following troubleshooting steps should be taken:

1. Loose or disconnected wiring at the ATOS solenoid valve connection point will prevent the valve from being energized. Tighten the wiring.

2. If the ATOS solenoid valve coil is burnt out, disconnect the solenoid valve wiring and use a multimeter to measure. If an open circuit is found, the solenoid valve coil is burnt out. Causes include moisture in the coil causing poor insulation and magnetic leakage, resulting in excessive current and burnout. Therefore, prevent rainwater from entering the solenoid valve. Additionally, an overly stiff spring, excessive reaction force, or too few coil turns resulting in insufficient suction can also cause the coil to burn out. In an emergency, the manual button on the coil can be switched from the normal "0" position to the "1" position to open the valve.

3. If the ATOS solenoid valve is stuck: The clearance between the solenoid valve's spool sleeve and valve core is very small (less than 0.008mm), and they are usually assembled as a single piece. When mechanical impurities are introduced or there is insufficient lubrication, it is easy for the valve to get stuck. A temporary fix is ​​to insert a steel wire through the small hole at the head to make it spring back. The fundamental solution is to disassemble the solenoid valve, remove the valve core and valve core sleeve, and clean them with CCI4 to ensure the valve core moves freely within the valve sleeve. During disassembly, pay attention to the assembly sequence of each component and the location of external wiring to ensure correct reassembly and wiring. Also check if the oil mist lubricator nozzles are clogged and if there is sufficient lubricating oil.

4. Air Leakage: Air leakage will cause insufficient air pressure, making it difficult to open and close the forced valve. This is caused by damaged gaskets or worn slide valves, resulting in air leakage between several cavities. When troubleshooting a solenoid valve malfunction in the switching system, choose an appropriate time to address the issue when the solenoid valve is de-energized. If the problem cannot be resolved within one switching interval, suspend the switching system and address the issue at a later time.