ATOS proportional valve DKZOR-TEB-SN-NP-173-D5/I in stock

Brand

ATOS/Italian Atos

Features of ATOS proportional valves:

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.

ATOS proportional valves can 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 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 throttling control electronically (of course, pressure control can also be achieved through structural modifications). Since it is throttling 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.

ATOS Proportional Valve Product Advantages and Disadvantages

The main valve of a servo valve is generally a spool valve structure, similar to a directional valve. However, the valve core is not driven by an electromagnet, but by the hydraulic pressure output from the pre-stage valve. This is similar to an electro-hydraulic directional valve, except that the pre-stage valve of an electro-hydraulic directional valve is an electromagnetic directional valve, while the pre-stage valve of a servo valve is a nozzle-flapper 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, the valve port of the servo valve is made relatively small, so that even when the valve port is fully open, there must be a certain pressure loss to maintain the normal operation of the pilot valve.

ATOS proportional valves actually have many disadvantages: high energy consumption, prone to failure, poor contamination resistance, high price, etc. Their only advantage is that their dynamic performance is the highest among all hydraulic valves. Because of this single advantage, servo valves are necessary in many applications requiring high dynamic characteristics, such as aircraft and rocket servo control and turbine speed regulation. For applications with lower dynamic requirements, proportional valves are generally the dominant type.

Generally speaking, servo systems are mostly closed-loop control, while proportional valves are primarily used for open-loop control. Secondly, proportional valves offer more variety, including proportional pressure and flow control valves, providing more flexible control than servo valves. Internally, servo valves typically have zero overdrive, while proportional valves have a certain dead zone, resulting in lower control accuracy and slower response. However, in terms of 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.

The difference between ATOS proportional valves and servo valves is not strictly defined. 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 main differences between ATOS proportional valves and servo valves are:

1. Different drive devices: Proportional valves use proportional electromagnets; servo valves use force motors or torque motors.

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 list

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

Our company mainly deals in 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's subsidiary), MOOG (USA), ASCO (USA), MAC (USA), NUMATICS (USA), PARKER (USA), VICKERS (USA), ROSS (USA), Norgren (UK), OMAL (Italy), ATOS (Italy), CAMOZZI (Italy), UNIVER (Italy), and Camozzi (Italy).