ATOS proportional valve DHZO-A-071-L5/1820 in stock
$117.17
The ATOS proportional valve is a spool valve structure, but the valve core is not driven by an electromagnet, but by the hydraulic pressure output by the pre-stage valve. This is similar to the electro-hydraulic directional valve, except that the pre-stage valve of the electro-hydraulic directional valve is an electromagnetic directional valve, while the pre-stage valve of the servo valve is a nozzle-baffle valve or jet valve with better dynamic characteristics.
Brand
ATOS/Italian Atos
ATOS Proportional Valves
ATOS proportional valves control flow in two ways:
One is on/off control: either fully open or fully closed, the flow is either at its maximum or minimum, with no intermediate state, such as ordinary solenoid direct-flow valves, solenoid directional valves, and electro-hydraulic directional valves.
The other is continuous control: the valve port can open 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 throttling control of flow rate through electrical control (of course, pressure control can also be achieved through structural modifications). Since it is throttling control, there is inevitably 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. As the performance of proportional valves has improved, they are gradually approaching that of servo valves, leading to the emergence of proportional servo valves in recent years. The differences between Italian ATOS proportional valves and servo valves are mainly reflected in the following points:
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. Characteristics such as hysteresis, dead zone, bandwidth, and filtration accuracy differ, thus their applications differ. Servo valves and servo-proportional valves are mainly used in closed-loop control systems, while other types of proportional valves are mainly used in open-loop control systems and closed-loop speed control systems.
2.1 Servo valves have no dead zone at mid-position, while proportional valves do.
2.2 Servo valves have a higher frequency response, 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. Different valve core structure and machining precision. 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. Different neutral position functions. 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. Different rated pressure drop.
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, ROSS
British brands: Norgren
Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi
