62 200/117 ED
1/6
P1
P
62 200/117 ED
0.750.75
TT
BB
31.7531.75
PP
AA
25.925.9
15.515.5
5.15.1
12.712.7
3131
M5M5
Ø4Ø4
Ø7.5(max)Ø7.5(max)
21.521.5
30.230.2
40.540.5
3333
PP
P1P1
MZD
DIRECT OPERATED THREE-WAY
PRESSURE REDUCING VALVE
WITH FIXED OR VARIABLE
ADJUSTMENT
OPERATING PRINCIPLEMOUNTING INTERFACE
— The MZD valve is a three-way spool type direct operated
pressure reducing valve. It is normally open in the rest
position and the hydraulic fluid passes freely from the P1 line
to the P line.
The spool is subjected to the line P pressure on one side,
and on the other side by the adjustment spring. When the
pressure in line P exceeds the value set by the spring, the
valve closes until the pressure in P (reduced) equals the
calibrated value.
— The valve construction provides good adjustment sensitivity
with reduced drainage flow. The drainage is connected to
line T inside the valve.
— The three-way design provides protection of the secondary
circuit from pressure surges since it allows a reverse flow
from the actuator to the T discharge line.
— It is made as a modular version with ports
according to the ISO 4401 standards and can be
assembled quickly, without use of pipes, under
the ISO 4401-03 solenoid valves.
— The variable adjustment version is supplied
with a hexagonal head adjustment screw. Upon
request, it can be equipped with a SICBLOC
adjustment knob.
— The fixed adjustment version is available set
at value 20, 25 or 30 bar pressure.
I
SO 4401-03-02-0-05
(CETOP 4.2-4-03-350)
MODULAR VERSION
ISO 4401-03
p max
350 bar
Q max (see table of performances)
Maximum operating pressure
Maximum pressure on port T
bar
350
10
Maximum flow rate in the controlled lines
Maximum flow rate in the free lines
Drainage flow rate
l/min
50
75
≤ 0,08
Ambient temperature range °C -20 / +60
Fluid temperature range °C -20 / +80
Fluid viscosity range cSt 10 ÷ 400
Fluid contamination degree
According to ISO 4406:1999
class 20/18/15
Recommended viscosity cSt 25
Mass kg 1,4
PERFORMANCES (measured with mineral oil of viscosity 36cSt at 50°C)
CONFIGURATIONS (see hydraulic symbols at par.1)
— MZD*: pressure reduction on line P, drainage connected with
line T.
— MZD*/A and MZD*/RA: pressure reduction on line A toward the
actuator and maximum pressure in line B, drainage connected
with line T.
— MZD*/B and MZD*/RB: pressure reduction on line B toward the
actuator and maximum pressure in line A, drainage connected
with line T.
62 200/117 ED
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MZD
1 - IDENTIFICATION CODE OF MZD VARIABLE ADJUSTMENT VERSION
Seals:
omit for mineral oils
V = viton for special fluids
Series No.:
50 - for MZD*, MZD*/RP, MZD*/A,
MZD*/RA, MZD*/B valves
51 - for MZD*/RB valves
(the overall and mounting dimensions
remain unchanged from 50 to 59)
Pressure adjustment range:
2 = 3 ÷ 35 bar 4 = 30 ÷ 140 bar
3 = 10 ÷ 70 bar 5 = 50 ÷ 280 bar
Size: ISO 4401-03 modular version
Direct operated pressure reducing
valve
M = Adjustment with SICBLOC knob
(omit for adjustment with hexagonal head screw)
M Z D / / / /
2 - MZD VARIABLE ADJUSTMENT VERSION CHARACTERISTIC CURVES
(values obtained with viscosity of 36 cSt at 50°C)
ADJUSTMENT
NOTE: the versions RP, RA and RB have been realised with regulation unit on side A, so as to be interchangeable with valves
produced by other companies.
The standard version is equipped with regulation unit on side B.
Configurations
(omit for MZD with pressure reduction on line P and regulation
unit on side B)
A: pressure reduction on line A and full pressure on line B
with regulation unit on side B
B: pressure reduction on line B and full pressure on line A
with regulation unit on side B
RP: pressure reduction on line P with regulation unit on side A
RA: pressure reduction on line A and full pressure on line B
with regulation unit on side A
RB: pressure reduction on line B and full pressure on line A
with regulation unit on side A
PRESSURE DROPS ∆p - Q
Hydraulic symbols
62 200/117 ED
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MZD
4 - HYDRAULIC FLUIDS
Use mineral oil-based hydraulic fluids HL or HM type, according to ISO 6743-4. For these fluids, use NBR seals. For fluids HFDR type
(phosphate esters) use FPM seals (code V). For the use of other kinds of fluid such as HFA, HFB, HFC, please consult our technical
department.
Using fluids at temperatures higher than 80 °C causes a faster degradation of the fluid and of the seals characteristics.The fluid must be
preserved in its physical and chemical characteristics.
3 - IDENTIFICATION CODE OF MZD FIXED ADJUSTMENT VERSION
Seals:
omit for mineral oils
V = viton for special fluids
Series No.:
(the overall and mounting dimensions
remain unchanged from 50 to 59)
Adjustment:
020 = 20 bar 030 = 30 bar
025 = 25 bar
Size: ISO 4401-03 modular version
Direct operated pressure reducing
valve
Configurations
(omit for MZD with pressure reduction on line P and regulation
unit on side B)
A: pressure reduction on line A and full pressure on line B
with regulation unit on side B
B: pressure reduction on line B and full pressure on line A
with regulation unit on side B
Hydraulic symbols
M Z D - / / 50 /
62 200/117 ED
4/6
MZD
3
1
98
T
B
A
14.2
P
80
1
93
4
6
2
4
8
40
7.5
4
126
5 - OVERALL AND MOUNTING DIMENSIONS VARIABLE ADJUSTMENT VERSION
dimensions in mm
48
40
46
2
1
3
4
126
T
BA
24.8
P
193
8098
7.5
MZD*
MZD*/A
MZD*/B
MZD*/RP
MZD*/RA
MZD*/RB
1 Mounting surface
with sealing rings:
4 OR type 2037
(9.25x1.78)
90 Shore
2
Pressure gauge port
1/4” BSP
3 Hexagonal head
adjustment screw.
Spanner 17.
Rotate clockwise to
increase pressure
4
SICBLOC knob.
To operate, push and
rotate at the same
time.
62 200/117 ED
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MZD
1
22.3
8
0.5
7
.5
4
6
4
0
48
1
2
T
P
AB
T
AB
1
4.2
1
38.5
6 - OVERALL AND MOUNTING DIMENSIONS FIXED ADJUSTMENT VERSION
dimensions in mm
MZD-*
MZD*/A
MZD*/B
1 Mounting surface
with sealing rings:
N. 4 OR type 2037
(9.25x1.78)
90 Shore
2
Pressure gauge port:
1/4” BSP
62 200/117 ED
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MZD
REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS.
