Brand

ATOS

ATOS proportional valves control flow in two ways:

One is on/off control: either fully open or fully closed, the flow is either at its maximum or minimum, with no intermediate state, such as ordinary solenoid direct-flow valves, solenoid directional valves, and electro-hydraulic directional valves. The other is continuous control: the valve 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 valves or servo valves is to achieve throttling control of flow rate through electrical control (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.

ATOS proportional valves control flow in two ways:

One is on/off control: either fully open or fully closed, the flow is either at its maximum or minimum, with no intermediate state, such as ordinary solenoid direct-flow valves, solenoid directional valves, and electro-hydraulic directional valves. Another type is continuous control: the valve port can be opened 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 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.

Product Advantages and Disadvantages

The main valve of a servo valve is generally a spool valve, 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 an electro-hydraulic directional valve, 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 the servo valve is controlled by the output pressure of the pilot valve, which in turn receives pressure from the servo valve’s inlet port (p). 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 servo valve’s orifice is made relatively small, ensuring a certain pressure loss even when the orifice is fully open to maintain the normal operation of the pilot valve.

ATOS proportional valve stock list:
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
DKZOR-T-171-L5
DKZOR-T-171-S5
DKZOR-T-171-S5/Y
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
DKZOR-TE-173-L5 40
Proportional directional valve DPZO-A-271-L5/DEG

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-AE-171-S5/E

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

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

Proportional Directional Valve DPZO-AE-171-S5/G +SP-ZH-7P

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-271-L5

Proportional Directional Valve DPZO-AE-271-L5