ATOS proportional valve DKZOR-AE-171-S5

Brand

ATOS/Italian Atos

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 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.

ATOS proportional valves 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 ordinary 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 (e.g., throttle valves) or electrically controlled (e.g., proportional valves and servo valves). Therefore, the purpose of using proportional or servo valves is to achieve throttling control of flow rate electrically (and, with structural modifications, pressure control, etc., can also be achieved). Since it's 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.

ATOS Proportional Valve Structure

The main valve of a servo valve is generally a spool valve, similar to a directional valve. However, the valve 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 a servo valve is controlled by the output pressure of the pilot valve, and the pressure of the pilot valve 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.

We know that 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, servo valves have relatively small orifices, requiring a certain pressure loss even when fully open to maintain the normal operation of the pre-stage valve.

Servo valves actually have many disadvantages: high energy consumption, prone to failure, poor contamination resistance, high price, etc. Their only advantage is their highest dynamic performance among all hydraulic valves. This single advantage makes them indispensable in many applications with high dynamic performance requirements, such as aircraft and rocket steering, and turbine speed control. For applications with lower dynamic requirements, proportional valves are generally preferred.

Generally speaking, servo systems are mostly closed-loop control, while proportional valves are mostly used for open-loop control. Secondly, proportional valves come in more types, including proportional pressure and flow control valves, offering more flexible control than servo valves. Internally, servo valves are mostly zero-overlap, 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.

Common ATOS proportional valve models:

ATOS proportional valve DKZOR-A-171-L5

ATOS proportional valve DKZOR-A-171-S5

ATOS proportional valve DKZOR-A-171-S5/18

ATOS proportional valve DKZOR-A-173-D5

ATOS proportional valve DKZOR-A-173-L5

ATOS proportional valve DKZOR-A-173-L5/18 40

ATOS proportional valve DKZOR-A-173-L5/Y

ATOS proportional valve DKZOR-A-173-S3 ATOS proportional valve DKZOR-A-173-S5

ATOS proportional valve DKZOR-A-173-S5/18

ATOS proportional valve DKZOR-AE-171-L5 10

ATOS proportional valve DKZOR-AE-171-S5

ATOS proportional valve DKZOR-AE-171-S5

10/WG

ATOS proportional valve DKZOR-AE-171-S5

/Y 10

ATOS proportional valve DKZOR-AE-173-D5 10

ATOS proportional valve DKZOR-AE-173-L5 10

ATOS proportional valve DKZORC-A-151-S5/18 ATOS proportional valve DKZOR-T-151-L5

ATOS proportional valve DKZOR-T-151-L5/Y

ATOS proportional valve DKZOR-T-153-L5

ATOS proportional valve DKZOR-T-171-D5

ATOS proportional valve DKZOR-T-171-L5

ATOS proportional valve DKZOR-T-171-S5

ATOS proportional valve DKZOR-T-171-S5/Y

ATOS proportional valve DKZOR-T-173-L5 40

ATOS proportional valve DKZOR-TE-170-L5 40

ATOS proportional valve DKZOR-TE-171-L5 ATOS proportional valve DKZOR-TE-171-L5/I 40

ATOS proportional valve DKZOR-TE-171-S5

ATOS proportional valve DKZOR-TE-171-S5/Y

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