ATOS proportional directional valve DKZO-A-171-L5 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 Valves

ATOS proportional directional 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 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.

Differences between ATOS Proportional Directional Valves and Servo Valves

ATOS proportional directional valves differ mainly in the following aspects:

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

2. Different performance parameters: Hysteresis, dead zone, bandwidth, and filtration accuracy differ, leading to different applications. Servo valves and servo-proportional valves are primarily 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 in the neutral 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. Different valve core structures 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 valves are a type of proportional valve used to control flow rate and direction.

Extended Information---Automatic control of electric proportional valves can be divided into intermittent control and continuous control. Intermittent control is on/off control. Pneumatic control systems use on/off directional valves with low operating frequencies to control the opening and closing of the air path. Pressure reducing valves regulate the required pressure, and throttle valves regulate the required flow rate. This traditional pneumatic control system requires multiple pressure reducing valves, throttle valves, and directional valves to achieve multiple output forces and multiple movement speeds. This not only increases the number of components, raising costs and complicating the system structure, but also requires many components to be manually adjusted in advance. Electro-proportional valve control is a type of continuous control, characterized by output varying proportionally to input. Proportional control can be open-loop or closed-loop.

ATOS Proportional Directional Valve Structure and Principle

When the input signal to the ATOS proportional directional valve increases, the supply solenoid pilot valve 1 reverses, while the exhaust solenoid pilot valve 7 remains in the reset state. 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, which opens the supply valve core 4 connected to diaphragm 2, while the exhaust valve core 3 closes, 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.

ATOS Proportional Directional Valve Features:

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. Less affected by temperature changes. Proportional Directional Valve DPZO-A-271-L5/DEG

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Proportional Directional Valve DPZO-LE-271-L5 in Stock

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: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi