ATOS proportional valve DLHZO-TE-040-L71 from Italy is in stock.
$301.26
ATOS proportional valves from Italy control flow in two ways: On-off control and Continuous control. On-off control means the valve is either fully open or fully closed, with the flow rate either at its maximum or minimum, without intermediate states. Examples include common solenoid direct-flow valves, solenoid directional valves, and electro-hydraulic directional valves. Continuous control allows the valve to open to any desired degree, thus controlling the flow rate. These valves can be manually controlled, such as throttle valves, or electrically controlled, such as proportional valves and servo valves. Therefore, the purpose of using proportional or servo valves is to achieve flow control through electrical means (of course, this can also be achieved through structural modifications).
Brand
ATOS/Italian Atos
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ATOS Proportional Valve Working Principle
ATOS proportional valves generally employ a differential diameter piston structure with unequal pressure-bearing areas at both ends.
The working principle of the ATOS proportional valve is as follows: When the proportional valve is not in operation, the differential diameter piston is at its upper limit position under the action of the spring. At this time, the valve remains open. Therefore, in the initial stage of the synchronous increase of the input control pressure and output pressure from zero, they are always equal. However, the hydraulic force above the piston is greater than the hydraulic force below the piston. During the synchronous increase of the input and output pressures, when the difference in hydraulic force between the upper and lower ends of the piston exceeds the preload of the spring, the piston begins to move downwards. When the input and output pressures increase to a certain value, the valve seat in the piston cavity contacts the valve, isolating the inlet and outlet chambers. This is the balanced state of the proportional valve.
If the input pressure is further increased, the piston will rise, and the valve will reopen. As oil continues to flow into the outlet chamber, the output pressure increases, but the piston then descends to its equilibrium position. The operating point of a proportional valve controlling the rear wheel pipeline pressure is independent of the vehicle's load; this is a non-load-sensing proportional valve. To adapt its operating point to the magnitude of the vehicle load, the spring force must be adjustable; this is a load-sensing proportional valve.
Generally speaking, servo systems are mostly closed-loop control, while proportional valves are often used in open-loop control. Secondly, there are more types of proportional valves, such as proportional pressure and flow control valves, offering more flexible control than servo valves. Internally, servo valves often have zero overload, while proportional valves have a certain dead zone, resulting in lower control accuracy and slower response. However, in terms of development trends, especially in proportional directional flow control valves and servo valves, the performance difference between the two is gradually narrowing. Furthermore, proportional valves are significantly cheaper than servo valves and have stronger resistance to contamination.
ATOS Proportional Valve Structure and Principle (Italy):
When the input signal increases, the pilot valve 1 of the supply solenoid valve switches, while the exhaust solenoid pilot valve 7 remains in the reset state. The supply pressure then enters the pilot chamber 5 through the SUP port and valve 1. The pressure in the pilot chamber rises, and this pressure acts on the diaphragm 2, opening the supply valve core 4 connected to diaphragm 2 and closing the exhaust valve core 3, generating output pressure. This output pressure is fed back to the control circuit 8 via pressure sensor 6. Here, a rapid comparison and correction is performed with the target value until the output pressure is proportional to the input signal, thus demonstrating that the output pressure changes proportionally to the input signal. Because there is no nozzle-baffle mechanism, the valve is insensitive to impurities and has high reliability.
ATOS Proportional Valve Features (Italy):
1) Enables stepless adjustment of pressure and speed, avoiding the impact phenomenon during switching of normally open on/off valves.
2) Enables remote and program control.
3) Compared to intermittent control, the system is simplified, and the number of components is greatly reduced. 4) Compared to hydraulic proportional valves, it is smaller, lighter, simpler in structure, and lower in cost, but its response speed is much slower than that of a hydraulic system, and it is more sensitive to load changes.
5) It uses less power, generates less heat, and produces less noise.
6) It will not cause a fire and will not pollute the environment. It is less affected by temperature changes.
