ATOS proportional valve DPZO-TEB-SN-NP-173-D9/D in stock

Brand

ATOS/Italian Atos

ATOS Piston Pumps, ATOS Gear Pumps, ATOS Axial Piston Pumps, ATOS Vane Pumps, ATOS Hydraulic Cylinders, ATOS Relief Valves

ATOS Proportional Valve Structure and Principle:

When the input signal to the ATOS proportional valve increases, the pilot valve 1 of the supply solenoid valve reverses, 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 above the diaphragm 2, causing the supply valve core 4 connected to the diaphragm 2 to open, while the exhaust valve core 3 closes, 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.

ATOS Proportional Valve

Features

1) Enables stepless adjustment of pressure and speed, avoiding the shock phenomenon during switching of normally open on/off pneumatic valves.

2) Enables remote and program control.

3) Compared to 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 hydraulic systems, and it is more sensitive to load changes.

5) Low power consumption, low heat generation, and low noise.

6) Will not cause fires and does not pollute the environment. It is less affected by temperature changes.

ATOS Proportional Valve

In other words, the main valve of the servo valve is controlled by the output pressure of the pre-stage valve, and the pressure of the pre-stage valve comes from the inlet p of the servo valve. If the pressure at port p is insufficient, the pre-stage valve cannot output enough pressure to drive the main valve core. We know that when the load is zero, if the four-way spool valve is open, the pressure at port P = pressure at port T + 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 will fail. 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.

Servo valves actually have many disadvantages: high energy consumption, prone to failure, poor resistance to contamination, 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 with high dynamic performance requirements, such as aircraft and rocket servo control, and turbine speed regulation. For applications with lower dynamic requirements, proportional valves are generally preferred.

Generally speaking, servo systems seem to be closed-loop control, while proportional valves are mostly used for open-loop control; secondly, proportional valves have more types, including proportional pressure and flow control valves, and their control is more flexible than that of servo valves. From their internal structure, servo valves are mostly zero-coverage, while proportional valves have a certain dead zone, resulting in lower control accuracy and slower response. However, looking at development trends, especially in proportional directional 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.

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 direct-flow valves, solenoid directional valves, and electro-hydraulic directional valves.

The other 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 stock 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).