ATOS proportional directional valve DKZOR-A-151-S5/B in stock
$411.82
The main valve of the Italian ATOS proportional directional valve is generally a spool valve structure, just like the directional valve. However, 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-flange valve or jet valve with better dynamic characteristics.
Brand
ATOS/Italian Atos
ATOS Hydraulic Pumps, ATOS Piston Pumps, ATOS Gear Pumps, ATOS Axial Piston Pumps, ATOS Vane Pumps
ATOS proportional valves control flow in two ways: One is on/off control: either fully open or fully closed, with flow either at its maximum or minimum, without intermediate states, 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 or servo valves is to achieve flow throttling control electrically (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.
Differences between ATOS proportional valves and servo valves:
ATOS proportional valves differ primarily in the following ways:
1. Drive mechanism: Proportional valves use a proportional electromagnet; servo valves use a force motor or torque motor.
2. Performance parameters: Hysteresis, dead zone, bandwidth, and filtration accuracy differ, leading to different applications. 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, reaching up to approximately 200Hz, while proportional valves typically 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: 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 Drops.
ATOS proportional directional valve control can be divided into two types: one is on/off control: either fully open or fully closed, with flow either at maximum or minimum, without intermediate states, such as ordinary solenoid straight-through 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 flow throttling control electronically (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 structural principle of the ATOS proportional directional valve:
When the input signal to the ATOS proportional directional 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 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 loop 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.
Features of the ATOS proportional directional valve:
1) It can achieve stepless adjustment of pressure and speed, avoiding the impact phenomenon during switching of normally open on/off valves.
2) It can achieve remote control and program control.
3) Compared with 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.
ATOS proportional directional valve stock list:
DHZO-T-071-S5
DHZO-TE-051-L5/Y 40
DHZO-TE-071-L5
DHZO-TE-071-S5 40/PE
DHZO-TE-073-S5
DKZA-A-173-L5/PA-M/7
DKZO-A-151-S5
DKZO-A-171-L5
DKZO-A-173-S5
DKZOR-A-151-S5
DKZOR-A-151-S5/18 40
DKZOR-A-151-S5/B
DKZOR-A-153-L5/B
DKZOR-A-171-D5 40 DKZOR-A-171-L5
DKZOR-A-171-S5
DKZOR-A-171-S5/18
DKZOR-A-173-D5
DKZOR-A-173-L5
DKZOR-A-173-L5/18 40
DKZOR-A-173-L5/Y
DKZOR-A-173-S3
DKZOR-A-173-S5
DKZOR-A-173-S5/18
DKZOR-AE-171-L5 10
DKZOR-AE-171-S5
DKZOR-AE-171-S5 10/WG
DKZOR-AE-171-S5/Y 10
DKZOR-AE-173-D5 10 DKZOR-AE-173-L5 10
DKZORC-A-151-S5/18
DKZOR-T-151-L5
DKZOR-T-151-L5/Y
DKZOR-T-153-L5
DKZOR-T-171-D5
DKZOR-T-171-L5
DKZOR-T-171-S5
DKZOR-T-171-S5/Y
DKZOR-T-173-L5 40
DKZOR-TE-170-L5 40
DKZOR-TE-171-L5
DKZOR-TE-171-L5/I 40
DKZOR-TE-171-S5
DKZOR-TE-171-S5/Y DKZOR-TE-173-L5 40
Proportional Directional Valve DPZO-A-271-L5/DEG
Proportional Directional Valve DPZO-A-271-L5/DEG
Proportional Directional Valve DPZO-A-273-D5/D/G
Proportional Directional Valve DPZO-A-273-D5/E30
Proportional Directional Valve DPZO-A-273-S5
Proportional Directional Valve DPZO-A-371-L5/DG
Proportional Directional Valve DPZO-A-373-D5/E30
Proportional Directional Valve DPZO-AE-171-S5/E
Proportional Directional Valve DPZO-AE-171-S5/E
Proportional Directional Valve DPZO-AE-171-S5/G
Proportional Directional Valve DPZO-AE-171-S5/G +SP-ZH-7P
Proportional Directional Valve DPZO-AE-171-L5/E
Proportional Directional Valve DPZO-AE-173-S5
Proportional Directional Valve DPZO-AE-271-L5
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 sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Henstler, Murr, Schmersal, Samson, EPRO (Emerson subsidiaries)
American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS
British brands: Norgren
Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi
