ATOS proportional valve DHZA-A-071-L5/M/721 in stock
$186.84
Features of Italian ATOS proportional valves: 1) Infinitely variable pressure and speed regulation, avoiding the shock phenomenon during switching of normally open on/off valves. 2) Enables remote and program control. 3) Simplifies the system and greatly reduces the number of components compared to intermittent control. 4) Compared to hydraulic proportional valves, it is smaller, lighter, simpler in structure, and lower in cost, but its response speed is much slower 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.
Brand
ATOS/Italian Atos
ATOS Proportional Valve Structure and Principle
When the input signal of the Italian 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 the air pressure acts on the diaphragm 2, causing the supply valve core 4 connected to diaphragm 2 to open, and the exhaust valve core 3 to close, 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 Italian ATOS proportional valve can control flow in two ways:
One is on/off control: either fully open or fully closed, the flow rate is either maximum or minimum, with no intermediate state, such as ordinary solenoid straight-through valves, solenoid directional valves, and electro-hydraulic directional valves.
Another type is continuous control: the valve port can be opened to any degree as needed, thereby 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 valves or servo valves is to achieve flow control through electrical means (of course, pressure control can also be achieved through structural modifications). Since it is flow control, there will inevitably be energy loss. Servo valves differ from other valves in that their energy loss is greater because they require a certain flow rate to maintain the operation of the pre-stage control circuit.
The difference between Italian ATOS proportional valves and servo valves: There is no strict definition of the difference between servo valves and proportional valves. Because the performance of proportional valves has improved, they are gradually approaching that of servo valves, so proportional servo valves have emerged in recent years.
The main differences between Italian ATOS proportional valves and servo valves are as follows:
1. Different drive devices. The drive device of a proportional valve is a proportional electromagnet; the drive device of a servo valve is a force motor or torque motor;
2. Different performance parameters. 2.1 Servo valves have no dead zone in the neutral position, while proportional valves do. Therefore, their applications differ. Servo valves and servo proportional valves are mainly used in closed-loop control systems, while other proportional valve structures are mainly used in open-loop control systems and closed-loop speed control systems.
2.2 Servo valves have a higher frequency response (response frequency), reaching up to around 200Hz, while proportional valves generally have a maximum frequency of tens of Hz.
2.3 Servo valves have higher requirements for hydraulic fluid, requiring fine filtration to prevent clogging, while proportional valves have lower requirements.
3. Valve core structure and machining precision differ. Proportional valves use a valve core + valve body structure, with the valve body also serving as the valve sleeve. Servo valves and servo proportional valves use a valve core + valve sleeve structure.
4. Neutral position functions differ. Proportional directional valves have neutral position functions similar to ordinary directional valves, while servo valves only have an O-type neutral position function (E-type for Rexroth products).
5. Rated pressure drop differs.
ATOS proportional valve spot models:
DHZO-A-053-L320
DHZO-A-053-L3/18
DHZO-A-053-L5
DHZO-A-053-L5/18
DHZO-A-060-S3
DHZO-A-071-L120
DHZO-A-071-L1/18
DHZO-A-071-L5
DHZO-A-071-L5/1820
DHZO-A-071-S320
DHZO-A-071-S5
DHZO-A-073-D5
DHZO-A-073-D5/18
DHZO-A-073-L5
DHZO-A-073-S320 DHZO-A-073-S5
DHZO-AE-051-S510
DHZO-AE-071-D5/I
DHZO-AE-071-S5/I
DHZO-AE-073-D5/I10
DHZO-AE-073-S510
DHZO-AE-073-S5/I10
DHZA-A-051-S3/M/721
DHZA-A-051-S3/PA-GK/7
DHZA-A-051-S5/M/721
DHZA-A-071-L5/M/721
DHZO-A-051-S5
DHZO-ATE-073-P3/B/DP27SB20
DHZO-T-051-L1 DHZO-T-051-L531
DHZO-T-071-D5
DHZO-T-071-L5
DHZO-T-071-S5
DHZO-TE-051-L5/Y40
DHZO-TE-071-L5
DHZO-TE-071-S540/PE
DHZO-TE-073-S5
DKZA-A-173-L5/PA-M/7 The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM 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, Helón (Norgren)
Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi
