Piping parameters for selecting Italian ATOS solenoid valves
$473.97
The working principle of the Italian ATOS solenoid valve: When energized, the electromagnetic force opens the pilot orifice, and the pressure in the upper chamber drops rapidly, creating a pressure difference around the closing element (lower at the top and higher at the bottom). The fluid pressure pushes the closing element upward, opening the valve. When de-energized, the spring force closes the pilot orifice, and the inlet pressure quickly creates a pressure difference around the closing element through the bypass orifice, creating a pressure difference around the closing element (lower at the bottom and higher at the top). The fluid pressure pushes the closing element downward, closing the valve.
Brand
ATOS/Italian Atos
Flow Direction
Other
3C Valve Category
Industry
Application Areas
Environmental Protection, Petroleum, Electronics/Batteries, Electrical, General
ATOS solenoid valves use a single solenoid coil to generate magnetic attraction that overcomes spring pressure, actuating the valve core. They are simple in structure, inexpensive, and only function as on/off valves.
ATOS electric valves use an electric motor to drive the valve stem, which in turn moves the valve core. Electric valves are further divided into shut-off valves and regulating valves. Shut-off valves operate in two positions (fully open and fully closed), while regulating valves have an electric valve positioner installed, using closed-loop regulation to dynamically stabilize the valve in a specific position.
Piping parameters for selecting Italian ATOS solenoid valves:
1) Select the valve port and model based on the medium flow direction requirements and pipeline connection method;
2) Select the nominal diameter based on the flow rate and valve Kv value, or select the same as the pipeline inner diameter;
3) Working pressure difference: For a minimum working pressure difference above 0.04 MPa, an indirect pilot-operated type can be selected; for a minimum working pressure difference close to or less than zero, a direct-acting or step-by-step direct-acting type must be selected.
The Italian ATOS solenoid valve has a sealed chamber with through holes at different positions, each hole connecting to a different oil pipe. In the center of the chamber is a piston, and on either side are two electromagnets. When the coil of one electromagnet is energized, the valve body is attracted to that side. By controlling the movement of the valve body, different drain holes are opened or closed. The inlet hole is always open, allowing hydraulic oil to enter different drain pipes. The oil pressure then pushes the piston in the cylinder, which in turn drives the piston rod, which in turn drives the mechanical device. Thus, controlling the current to the electromagnets controls the mechanical movement. Selection Criteria for Italian ATOS Solenoid Valves:
1. Selection based on pipeline parameters: Nominal diameter (DN), connection type
1) Determine the nominal diameter (DN) based on the pipeline's inner diameter or flow requirements.
2) Connection type: Generally, for DN > 50, a flange connection should be selected; for DN ≤ 50, the connection type can be freely chosen according to user needs.
2. Selection based on fluid parameters: Material, temperature group
1) Corrosive fluids: Corrosion-resistant solenoid valves and all-stainless steel 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 should be chosen.
3) Fluid state: Fluids can be gaseous, liquid, or mixed, especially for diameters greater than DN 25, which must be clearly distinguished.
4) Fluid viscosity: Generally, any fluid can be selected below 50 cSt; if it exceeds this value, a high-viscosity solenoid valve should be selected. 3. Selecting Solenoid Valves Based on Pressure Parameters: Principle and Structure
1) Nominal Pressure: This parameter has the same meaning as other general valves, determined by the nominal pressure of the pipeline.
2) Working Pressure: If the working pressure is low, a direct-acting or step-direct-acting principle must be selected. For working pressure differentials above 0.04 MPa, direct-acting, step-direct-acting, and pilot-operated valves can all be selected.
4. Electrical Selection: AC220V or DC24V voltage specifications should be prioritized for convenience.
ATOS solenoid valves generally have a very small flow coefficient and a small working pressure differential. For example, the flow coefficient of a 25mm solenoid valve is much smaller than that of a 15mm electric ball valve. Solenoid valves are driven by an electromagnetic coil, making them relatively susceptible to damage from voltage surges. They function like a switch, with only two actions: opening and closing.
ATOS electric valves are generally driven by a motor, which is more resistant to voltage surges. Solenoid valves are quick-opening and quick-closing, generally used in applications with low flow rates and low pressures, requiring high switching frequencies. Electric valves, on the other hand, are less prone to damage. Electric valves can control the opening degree, with states including open, closed, and partially open/closed, and can control the flow rate of the medium in the pipeline, while solenoid valves cannot meet this requirement.
