1. Proportional pressure relief pilot valve
2. Digital amplifier
3. Proportional electromagnet
4. The valve body
5. Valve set
6. The valve core
1. Overview of proportional valve products
MA- LEQZA-A (ES) is A two - way cartridge proportional throttle valve, block - mounted installation. It is mainly by proportional pressure guide valve (1) to control the valve element 7 in
Valve sleeve for a straight line movement. Provides flow control based on the size of the input electrical signal. These valves work in conjunction with the amplifier, which lifts the proportional valve
An appropriate drive current, adjusted by the calibrated valve, corresponding to the input signal supplied to the amplifier.
Flow regulation is through the role of pressure oil on the main valve core (7) chamber closed area, and installed on the main valve core (7) to achieve a compression spring (5)
Force balance. Change the control oil pressure size, let the main valve element (7) in the valve sleeve for reciprocating movement, and therefore change the oil area of the valve mouth, in order to achieve
Flow size control.
The control pilot valve is a ma-dhrzo proportional pressure reducing valve. The main features are: reduced response time, accurate flow control and good repeatability.
2. Selection table of proportional overflow valve:
| MA- |
LEQZO |
AES |
PS |
25 |
2 |
L4 |
/L |
* |
|
Model
|
Cartridge type proportional throttle valve |
A= No position sensor |
Communication interface (for rail type digital amplifier only)
PS=RS232 Serial interface
|
The dimensions
|
Valve function：
2=2 ways
|
Adjustment feature：
|
UO- The input signal 0~10V |
blank =Petroleum based hydraulic fluid |
| AES= Same as A. with integrated digital amplifier |
16=16size |
S4=nonlinear |
I= Input current signal 4-20mA |
| 25=25size |
WG= Water glycol |
|
|
32=32size |
L4=linear |
The following only for -TERS type valve |
| |
|
F- The fault signal |
PE= Phosphate ester |
| |
|
Q= Band enable signal |
3, the proportional cartridge valve performance data (ambient temperature - 20 ℃ ~ 60 ℃)
Hydraulic symbols
|
Vlave model
|
MA-LEQZO-A
|
MA-LEQZO-AES |
|
Size specification of valve core
|
16
|
25
|
32
|
|
Max flow
（ L/min ）
|
△ P=5bar
|
140
|
230
|
350
|
|
△ P=10bar
|
200
|
320
|
490
|
|
Max pressure bar
|
250
|
|
P=70 bar When the pilot valve operating flow L/ min
|
5
|
10
|
18
|
|
△ P=100 bar The amount of leakage when L/ min
|
0.3
|
0.5
|
0.5
|
|
The signal from 0-100% Response time as changes
|
75ms
|
|
Hysteresis (% of maximum pressure applied)
|
≤ 5
|
|
Repeat accuracy (% of maximum pressure adjusted)
|
± 1
|
|
Amplifier and plug
|
E300(see pages 111-118) E200(see pages 105-110)
|
|
Amplifier power supply
|
24VDC
|
Note: 1 recommended value of pilot and: 120~140 bar, minimum pilot oil pressure 20bar
If the pilot pressure oil cannot be supplied for a long time, please turn off the power of the electronic amplifier to avoid burning out due to overheating.
4. This proportional valve working curve (oil temperature 45 ℃, 46 # anti-wear hydraulic oil)
4.1. Flow regulation curve (P=5BAR)
1=MA-LEQZO-A(ES)-162S4 2=MA-LEQZO-A(ES)-162L4 3=MA-LEQZO-A(ES)-252S4 4=MA-LEQZO-A(ES)-252L4
5=MA-LEQZO-A(ES)-322S4 6=MA-LEQZO-A(ES)- 322L4
MA-LEQZO-A mounting dimensions:
MA-LEQZO-A-162 MA-LEQZO-A-252 MA-LEQZO-A3-322 MA-LEQZO-AES-162 MA-LEQZO-AES-252 MA-LEQZO-AES-322
| MA-LEQZO-A*-16 MA-LEQZO-A*-25 MA-LEQZO-A*-32 |
| SIZE |
A |
G |
B |
C |
D |
E |
Fastening screw |
WEIGHT（KG) |
| NG16 |
80 |
65 |
38 |
50 |
47.5 |
32.5 |
4-M8*50 |
4 |
| NG25 |
85 |
85 |
30 |
60 |
42.5 |
42.5 |
4-M12*50 |
6 |
| NG32 |
130 |
130 |
88 |
110 |
65 |
65 |
4-M16*120 |
7.5 |
5 mounting size:
Pressure switch
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