ATOS proportional valve RZGO-AEB-NP-033/315/I in stock
$129.90
Italian ATOS proportional valves are all closed-loop control valves, while proportional valves are mostly used for open-loop control. Secondly, proportional valves come in a wider variety, including proportional pressure and flow control valves, offering more flexible control than servo valves. Internally, servo valves typically have zero override, while proportional valves have a certain dead zone, resulting in lower control accuracy and slower response. However, looking at development trends, especially in proportional 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.
Brand
ATOS/Italian Atos
ATOS Proportional Valve Structure and Principle
When the input signal to the ATOS proportional valve 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 from the SUP port through valve 1. The pilot chamber pressure 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 change in the input signal. Because there is no nozzle-baffle mechanism, the valve is insensitive to impurities and has high reliability.
The structure of an ATOS proportional valve: The main valve of a servo valve is generally similar to that of a directional valve, using a spool valve structure. However, the spool is not driven by an electromagnet, but by the hydraulic pressure output from the pilot valve. This is similar to an electro-hydraulic directional valve, except that the pilot valve of an electro-hydraulic directional valve is an electromagnetic directional valve, while the pilot valve of a servo valve is a nozzle-flange valve or jet valve with better dynamic characteristics.
In other words, the main valve of an ATOS proportional valve is controlled by the output pressure of the pilot valve, which comes from the inlet (p) of the servo valve. If the pressure at port p is insufficient, the pilot valve cannot output enough pressure to actuate the main valve spool.
As we know, when the load is zero, if the four-way spool valve is open, the pressure at port p = the pressure at port t + the pressure loss at the valve port (ignoring other pressure losses in the oil circuit). If the pressure loss at the valve port is very small, and the pressure at port t is zero, then the pressure at port p is insufficient to supply the pilot valve to actuate the main valve spool, and the entire servo valve fails. Therefore, the servo valve's orifice is made relatively small. Even when the orifice is fully open, a certain pressure loss is necessary to maintain the normal operation of the pre-stage valve.
ATOS Proportional Valve Features
1) Enables stepless adjustment of pressure and speed, avoiding the shock phenomenon during directional switching of normally open on/off pneumatic valves.
2) Enables remote and program control.
3) Compared to intermittent control, the system is simplified, with a significant reduction in components.
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 hydraulic systems, and it is more sensitive to load changes.
5) Low power consumption, low heat generation, and low noise.
6) No fire hazard and no environmental pollution. Less affected by temperature changes.
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Our company mainly deals in European and American brands and can source brands from any European country. For example, our advantageous German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM door sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)
American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS
British brands: Norgren
Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi
