Advantages and disadvantages of ATOS proportional directional valve structure products

Brand

ATOS/Italian Atos

ATOS Proportional Directional Valve Structure Advantages and Disadvantages:

The main valve of an ATOS proportional directional valve is generally a spool valve, similar to a directional control 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 control valve, except that the pilot valve of an electro-hydraulic directional control valve is an electromagnet, 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 an ATOS proportional directional valve is controlled by the output pressure of the pilot valve, which 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 = 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.

ATOS proportional directional 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 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 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 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 Directional Valve Advantages and Disadvantages:

ATOS proportional servo valves offer performance between servo valves and proportional valves.

ATOS proportional directional valves are a type of proportional valve used to control flow rate and direction.

Extended Information---Automatic control of electrical proportional valves can be divided into intermittent control and continuous control. Intermittent control is also known as 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. Traditional pneumatic control systems require multiple pressure reducing valves, throttle valves, and directional valves to achieve multiple output forces and speeds. This not only increases the number of components, raising 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 directional valves can control flow in two ways: on/off control (either fully open or fully closed, with flow either at maximum or minimum, without intermediate states), such as ordinary solenoid direct-flow valves, solenoid directional valves, and electro-hydraulic directional valves; and continuous control (the valve can open to any desired degree, 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 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 directional valves in stock:

Proportional directional valve DPZO-L-273-L5

Proportional directional valve DPZO-LE-270-S5/G

Proportional directional valve DPZO-LE-271-L5

Proportional directional valve DPZO-LE-271-L5/D

Proportional directional valve DPZO-LE-271-L5/D/I

Proportional directional valve DPZO-TE-271-S5 40

Proportional directional valve DPZO-A-271-L5/DEG

Proportional directional valve DPZO-A-273-D5/D/G

Proportional directional valve DPZO-A-273-D5/E30

Proportional directional valve DPZO-A-273-S5

Proportional directional valve DPZO-A-371-L5/DG

Proportional directional valve DPZO-A-373-D5/E30

Proportional Directional Valve DPZO-TE-171-L5

Proportional Directional Valve DPZO-AE-171-S5/E

Proportional Directional Valve DPZO-AE-171-S5/G

Proportional Directional Valve DPZO-AE-171-L5/E

Proportional Directional Valve DPZO-AE-173-S5

Proportional Directional Valve DPZO-AE-271-L5

Proportional Directional Valve DPZO-AE-273-L5

Proportional Directional Valve DPZO-AE-273-L5

Proportional Directional Valve DPZO-AE-373-S5 The company mainly deals with 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 Group)

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

British brands: Norgren

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