ATOS proportional valve DHZA-A-071-L5/M/7 21 in stock

Brand

ATOS/Italian Atos

ATOS Proportional Valve Product Advantages and Disadvantages:

The main valve of a servo valve generally has a spool valve structure, similar to a directional valve. However, the valve core's switching is not driven by an electromagnet, but by the hydraulic pressure output from the pilot valve. This is similar to an electro-hydraulic directional valve, except that the pilot valve of an electro-hydraulic directional 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 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 core.

ATOS proportional valves: As we know, 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 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.

Generally speaking, servo systems seem to be closed-loop control, while proportional systems are mostly used for open-loop control. Secondly, there are more types of proportional valves, such as proportional pressure and flow control valves, which offer more flexible control than servo valves. Looking at their internal structure, servo valves are mostly zero-overlap, while proportional valves have a certain dead zone, resulting in lower control accuracy and slower response. However, from a development trend perspective, especially in proportional directional flow control valves and servo valves, the performance difference between the two is gradually narrowing. Furthermore, proportional valves are much cheaper than servo valves and have stronger resistance to contamination!

The difference between servo valves and proportional valves: There is no strict definition of the difference between servo valves and proportional valves. Because the performance of proportional valves has improved significantly, they are gradually approaching that of servo valves, leading to the emergence of proportional servo valves in recent years.

ATOS

ATOS manufactures proportional valves in both spool and cartridge types. Based on function, they can be divided into three categories:

》Pressure control valves: Proportional flow control valves and proportional pressure reducing valves can proportionally adjust system pressure according to the input signal;

》Four-way directional valves: Proportional control and adjustment of the flow and direction of the actuator according to the input signal. These valves are used in open-loop and closed-loop control systems to control the direction, speed, and acceleration of the actuator;

》Proportional valves equipped with ZO and ZORI high-efficiency electromagnets (30W and 40W):

ZO(R)-A: No integrated sensor, open loop;

ZO(R)-AE. AES: Same as ZO-A, but with an integrated electronic amplifier,

for use in compliance with ISO standards. 4401 standard direct-acting proportional valves in 6-bore and 10-bore sizes are available with the following combination options:

Analog or digital:

ZO(R)-T.-L: with integrated LVDT %/)9 (position sensor, closed loop, with high dynamic and static characteristics);

ZO(R)-TE, -I.E, LES: same as ZO-T, -L, plus integrated electronic amplifier 29. Analog or digital.

For the new generation .AE.-TE.-LE type valves, the electronic amplifier is integrated on the valve.

This type of valve is increasingly used in modern applications and systems.

All components are encapsulated in resin.

It can be pre-adjusted by the manufacturer to ensure good valve-to-valve interchangeability and simplify installation wiring and system commissioning. Due to these performance improvements,

Integrated electronics are encapsulated in resin and then housed in a metal box with an IP67 protection rating, ensuring shock resistance, impact resistance, and protection against climate change. There are no strict rules regarding the differences between ATOS proportional valves and servo valves. As the performance of proportional valves has improved, they are gradually approaching that of servo valves, leading to the emergence of proportional-servo valves in recent years.

The main differences between ATOS proportional valves and servo valves are as follows:

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, resulting in different applications. Servo valves and servo-proportional valves are mainly 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 at mid-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 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 types of neutral position functions. Proportional directional valves have neutral position functions similar to ordinary directional valves, while servo valves only have O-type neutral position functions (E-type for Rexroth products).

5. Different rated pressure drop.

Proportional servo valves have performance between servo valves and proportional valves.

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

DHZA-A-051-S3/M/7 21 DHZA-A-051-S3/PA-GK/7

DHZA-A-051-S5/M/7 21 DHZA-A-071-L5/M/7 21

DHZO-A-051-S5 DHZO-A-051-S5/18 DHZO-A-053-L3 20 DHZO-A-053-L3/18 ATOS

DHZO-A-053-L5 DHZO-A-053-L5/18

DHZO-A-060-S3 DHZO-A-071-L1 20 DHZO-A-071-L1/18

DHZO-A-071-L5 DHZO-A-071-L5/18 20

DHZO-A-071-S3 20 DHZO-A-071-S5 ATOS

DHZO-A-073-D5 DHZO-A-073-D5/18 DHZO-A-073-L5

DHZO-A-073-S3 20 DHZO-A-073-S5

DHZO-AE-051-S5 10 DHZO-AE-071-D5/I ATOS

DHZO-AE-071-S5/I DHZO-AE-073-D5/I 10

DHZO-AE-073-S5 10 DHZO-AE-073-S5/I 10

DHZO-AT-073-P3 20 DHZO-ATE-073-P3/B/DP27SB 20 ATOS

DHZO-T-051-L1 DHZO-T-051-L5 31 DHZO-T-071-D5

DHZO-T-071-L5 DHZO-T-071-S5 DHZO-TE-051-L5/Y 40 DHZO-TE-071-L5 ATOS

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 ATOS

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 ATOS

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 ATOS

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 ATOS

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 ATOS

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 ATOS

DKZOR-TE-173-L5 40 DKZO-T-171-S3 DKZO-T-173-S5

DLHZO-LE-060-V71/Q/LQ42SB 40

DLHZO-LE-060-V71/Q/LQ52SA 40 ATOS

DLHZO-T-040-L11 DLHZO-T-040-L13 DLHZO-T-040-L31

DLHZO-T-040-L51 DLHZO-T-040-L53 DLHZO-T-040-L71

DLHZO-T-040-L73 31 DLHZO-T-040-V71

DLHZO-TE-040-L11 DLHZO-TE-040-L1 The company primarily deals in European and American brands, and can source brands from any European country. For example, its key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, HIRSCHMANN industrial switches, Henschler, MURR, SCHMERSAL, SAMSON, and EPRO (a subsidiary of Emerson).

American brands include MOOG, ASCO solenoid valves, MAC solenoid valves, NUMATICS, PARKER pneumatics and hydraulics, VICKERS, and ROSS.

British brands include Norgren. Italian brands OMAL, ATOS, CAMOZZI, UNIVER, and Camozzi.