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62 411/121 ED
PZM7
PRESSURE REDUCING VALVE
SERIES 20
HYDRAULIC SYMBOLS
OPERATING PRINCIPLEMOUNTING INTERFACE
— PZM7 valves are pressure reducing valves for stack
mounting, with mounting surface according to ISO 4401-07
standard.
— They are two-stage valves and are employed to assure
stability of the controlled pressure, even changing the flow
that passes through the valve.
— The PZM7 valves can be assembled quickly under DSP7
directional valves (see catalogue 41 420), without use of
pipes, using suitable tie-rods or bolts, forming compact
modular groups.
— They are supplied with adjustment screw. Knob is
available as option.
ISO 4401-07-07-0-05
(CETOP 4.2-4-07)
MODULAR VERSION
ISO 4401-07
p max 350 bar
Q max 300 l/min
Maximum operating pressure bar 350
Maximum flow rate l/min 300
Drainage flow rate l/min ≤ 0.9
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 7.5
PERFORMANCES
(measured with mineral oil of viscosity 36 cSt at 50 °C)
PZM7-P
PZM7-PA
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PZM7
SERIES 20
1 - IDENTIFICATION CODE
REDUCED PRESSURE
PRESSURE DROPS Δp - Q
Seals:
N = seals in NBR for mineral oils (standard)
V = seals in FPM for special fluids
Series No.
(the overall and mounting dimensions remain
unchanged from 20 to 29)
P = Pressure reduction in P line, with external drain in Y
PA = Pressure reduction in P line, for reduced pressure in the
A line of the directional valve downstream.
Modular version
Pressure adjustment range:
035 = 6 ÷ 35 bar
070 = 6 ÷ 70 bar
150 = 8 ÷ 150 bar
250 = 10 ÷ 250 bar
300 = 10 ÷ 300 bar
Pressure reducing
valve
ISO 4401-07 size
Omit for hexagon socket adjustment
screw (standard)
K = Adjustment knob
P Z M 7 - P / 20 /
application
limit
2 - 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 - CHARACTERISTIC CURVES
(values obtained with viscosity of 36 cSt at 50°C)
Reduced pressure in P obtained for each adjustment range,
with inlet pressure 350 bar and inlet flow 350 l/min.
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PZM7
SERIES 20
4 - OVERALL AND MOUNTING DIMENSIONS
dimensions in mm
1
Mounting surface with sealing rings:
N. 4 OR type 130 (40x95x2.62)
N. 2 OR type 2043 (10.82x1.78)
2
Hexagon socket adjustment screw (standard).
Hex key 6
Clockwise rotation to increase pressure.
3 Locking nut: spanner 19
4 Pressure gauge port: 1/4” BSP
5 Adjustment knob: K
6 Locking ring
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PZM7
SERIES 20
REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS.
