DLHZO-TE-040-L71 * ATOS Proportional Valve

DLHZO-TE-040-L71 * ATOS Proportional Valve

Dongguan Guanglian Company has a large inventory of ATOS proportional valves, ATOS solenoid valves, ATOS overflow valves, ATOS oil pumps, ATOS cylinders, ATOS amplifiers, ATOS sensors, etc. If you happen to need ATOS products, you can compare prices with us!

ATOS proportional valveFeatures:

1) It can achieve infinite adjustment of pressure and speed, avoiding the impact phenomenon when the normally open switch air valve changes direction.

2) Can achieve remote control and program control.

3) Compared with intermittent control, the system is simplified and the components are greatly reduced.

4) Compared with hydraulic proportional valves, they have smaller volume, lighter weight, simpler structure, and lower cost, but their response speed is much slower than hydraulic systems and they are also more sensitive to load changes.

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

6) No fire, no pollution to the environment. Less affected by temperature changes.

The Atos proportional valve adjusts the cross-sectional area of the valve core according to the size of the control signal, in order to achieve the process goal and requirements of adjusting the flow rate. The proportional valve controls the gas pressure through electrical signals, which can achieve continuous and stepless adjustment of gas pressure, and can realize remote control and program control. The Atos ATOS proportional valve is particularly suitable for electrical proportional valves in situations where continuous or stepless adjustment of gas pressure is required. The electrical proportional method enables infinite control of outlet pressure, and the Atos ATOS proportional valve can achieve remote control and program control. Compared with intermittent control, the system is simplified and components are greatly reduced. Small size, light weight, compact structure, lightweight, and low cost, but the Atos ATOS proportional valve has a much slower response speed than hydraulic systems and is also sensitive to load changes.

Generally speaking, servo systems seem to be closed-loop control, while proportional valves are often used for open-loop control; Secondly, there are many types of proportional valves, such as proportional pressure and flow control valves, which are more flexible in control than servos. From their internal structure, ATOS servo valves are mostly zero covered, while proportional valves have a certain dead zone, low control accuracy, and slow response. But from the perspective of development trends, especially in the aspect of proportional flow control valves and servo valves, the performance difference between the two is gradually narrowing. In addition, the cost of proportional valves is much lower than that of servo valves, and their anti pollution ability is also strong!

ATOS proportional valveIn closed-loop control, the changes in the controlled hydraulic parameters are continuously detected through feedback sensors, so closed-loop control is less susceptible to environmental interference and detects the final adjustment results (unknown, speed, force, pressure, angle, etc.) through electrical sensing

Conventional hydraulic drives are usually used as transmissions, providing hydraulic energy through power components (pumps), controlling components (usually valves) to adjust pressure, flow rate, and oil flow direction, executing components (cylinders and motors) to complete linear and rotational motion, and outputting speed and force or speed and torque.

Introduction to the Characteristics and Principles of Italian ATOS Proportional Valve Products　

With the development of technology, in recent years, the application of hydraulic products has broken through the traditional use only as transmission. Through organic coordination with electrical technology, it has been widely used in closed-loop systems for position and speed, synchronous control, and has expanded the application fields for the development of hydraulic products.

1. The flow or pressure selection range of ATOS proportional valves should be closer to the actual flow or pressure in nominal value. If there is no corresponding range, then choose the one with a nominal flow value slightly larger than the actual value, because this will effectively apply the entire control range of all mechanical strokes and electrical parameters in the valve, thereby achieving the highest resolution. This is contrary to the selection principle of conventional valves (the larger the specification, the better), so the selection process of proportional valves needs to change the traditional thinking of the past.

2. The nominal flow rate of a proportional directional valve is the data obtained under a pressure difference of 1 MPa between the inlet and outlet. However, the pressure difference between the inlet and outlet of a hydraulic system is determined by the system pressure and load force, and is often not a constant value. Even if it is a constant value (such as a fixed load), it is often not 1 MPa. Therefore, the nominal flow rate cannot be used to determine the load operating speed. The actual flow rate through the valve can only be determined after calculating the pressure difference of the product passing through the valve.

3. The application of proportional valves is sometimes under variable loads. In order to maintain a constant flow rate through the proportional valve, a pressure compensator can be added below the proportional valve to maintain a constant pressure difference of 1MPa at both ends of the throttle port, thereby achieving a constant flow rate and speed. We will explain the pressure compensator separately later.

4. It is recommended to have throttling at both the inlet and outlet of the proportional valve. Therefore, when the execution structure is a single rod oil cylinder, the rod diameter area of the piston rod should be considered, and the throttling groove on one side of the piston rod should be reduced. If the added piston rod area is half of the cylinder area, the corresponding E1, E2, W1, W2 types of valves should be selected. The AB oil port of the proportional valve is already determined with the selection, and the two oil ports cannot be switched randomly.

5. ATOS proportional valve is different from switch valve. The switch valve has only two positions, either energized or de energized, corresponding to the action of opening and closing. However, proportional valves are different. They output a continuous current signal through a proportional amplifier. If the driving is a directional valve, it will cause the valve core opening of the directional valve to increase from minimum to maximum. If it is a pressure valve, it will cause the pressure value to increase from minimum to maximum; When given a very small signal, the stroke or thrust of the electromagnet will be very small; If the cleanliness of the oil is poor, the valve cannot be operated. Therefore, compared to switch valve products, the system cleanliness of proportional valves is higher. The cleanliness of conventional proportional valves should not be lower than NSA9 level. The higher the cleanliness, the lower the probability of problems and the longer the service life.

6. Some high-precision proportional valve products will be equipped with displacement sensors on the valve core to detect the movement position of the valve core, thereby ensuring the opening amount of the valve core (or the compression amount of the pressure spring). When the displacement sensor detects the position of the valve core and compares it with the input signal, if an error is found, the output current will be automatically adjusted through feedback signal to make the valve core reach the correct position. Typically, proportional valve products with sensors have higher repeatability and frequency response than those without sensors, and have relatively smaller dead zones.

7. For non integrated proportional valves with sensors, their electromagnets and wiring must be strictly in accordance with the instructions. If there are two electromagnets (divided into two electromagnets A and B), they must be connected according to the instructions for corresponding A and B. There are also four wires at the sensor, corresponding to wire numbers 1-4, which must be connected according to the wire numbers. Any wiring error can cause the amplifier to become unusable, and in severe cases, it may even burn out the amplifier.

8. New integrated proportional valves usually have two input modes. In the case of long-distance transmission or wireless interference from the outside, it is recommended to use current input products to achieve good anti-interference and no signal attenuation effect.

However, the selection principle of proportional valves is significantly different from that of traditional switch action products. Poor selection can increase costs while failing to meet performance requirements.

In integrated electronic components, the control value will be compared with the theoretical position value. When there is a control deviation, activate the stroke coil (due to changes in magnetic force, the coil needs to resist the spring to adjust the control valve core).

The travel/control section is proportional to the control value. When the preset control value is 0V, the electronic component presses against the spring and adjusts the control valve core to the center position. When stopped, the spring is in a relaxed state with the longest length, and the valve is in the fail safe position

　　Dlhzo-tech 040 -l 71*ATOS proportional valve