ATOS proportional valve DPZO-AEB-NP-471-S5 in stock
$343.87
Generally speaking, Italian ATOS proportional valves are more suitable for open-loop control than servo systems, which are typically used in closed-loop systems. Furthermore, proportional valves offer a wider variety of types, including proportional pressure and flow control valves, providing more flexible control than servo valves. Internally, servo valves often have zero override, 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. Additionally, proportional valves are significantly cheaper than servo valves and have stronger resistance to contamination. Generally speaking, servo systems seem to be closed-loop control systems.
Brand
ATOS/Italian Atos
ATOS Proportional Valve DLHZO-TEB-SN-NP-040-L71 in Stock
ATOS Stack Valve, ATOS Solenoid Valve, ATOS Amplifier, ATOS Solenoid Directional Valve, ATOS Pressure Regulator, ATOS Safety Valve, ATOS Control Valve
ATOS proportional valves offer performance between servo valves and proportional valves.
ATOS proportional valves are a type of proportional valve used to control flow rate and direction.
ATOS Proportional Valve Extended Information---Automatic control of electrical proportional valves can be divided into intermittent control and continuous control. Intermittent control is on/off control. Pneumatic control systems use on/off (ON-OFF) directional valves with low operating frequencies to control the airflow. Pressure regulators adjust the required pressure, and throttle valves adjust the required flow rate. This traditional pneumatic control system requires multiple pressure regulators, throttle valves, and directional valves to achieve multiple output forces and multiple movement speeds. This not only requires more components, increasing costs and complicating the system, but also necessitates manual adjustment of many components beforehand. Electro-proportional valve control is a continuous control method, characterized by output varying with input, exhibiting a proportional relationship between the two. Proportional control can be open-loop or closed-loop.
ATOS Proportional Valve Structure and Principle
When the input signal to the ATOS proportional valve increases, the supply solenoid pilot valve 1 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, acting 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 with the target value is performed until the output pressure is proportional to the input signal, thus demonstrating that the output pressure changes proportionally to the input signal. Because there is no nozzle-baffle mechanism, the valve is insensitive to impurities and has high reliability.
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) Simplifies the system and greatly reduces the number of components compared to intermittent control.
4) Compared to hydraulic proportional valves, it is smaller, lighter, simpler in structure, and lower in cost, but its response speed is much slower and it is more sensitive to load changes.
5) Low power consumption, low heat generation, and low noise.
6) Does not cause fires and does not pollute the environment. It is less affected by temperature changes.
The main valve of an ATOS proportional 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 electro-hydraulic directional valves, 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 a 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 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.
ATOS proportional valves can control flow in two ways: On-off control and Continuous control. 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, 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 throttling control of flow rate electronically (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 upstream control circuit.
ATOS proportional valve stock list:
DHZO-T-071-L5
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
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
