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0.75

31.75

25.9

15.5

5.1

12.7

Ø4

Ø7.5 (max)

21.5

30.2

40.5

PERFORMANCES (measured with mineral oil of viscosity 36cSt at 50°C) HYDRAULIC SYMBOLS

OPERATING PRINCIPLEMOUNTING SURFACE

— The PRM3 valve is a direct operated pressure relief valve

made as a modular version, with mounting surface

according to ISO 4401 standards.

— It can be assembled with all ISO 4401-03 modular valves

without the use of pipes, using suitable tie-rods or bolts.

— It is available in versions for single adjustment on one

control line, or dual on two control lines, in five different

pressure adjustment ranges.

— This valve is used as a hydraulic circuit pressure limiting

device or as a limiting device of the pressure peaks

generated during the movement of hydraulic actuators.

— It is supplied with a hexagonal head adjustment screw,

locking nut and limitation of the maximum adjustment

travel. A version with knob is also available.

ISO 4401-03-02-0-05

CETOP 4.2-4-03-350

PRM3

DIRECT OPERATED

PRESSURE RELIEF VALVE

SERIES 10

MODULAR VERSION

ISO 4401-03

p max

350 bar

Q max (see table of performances)

Maximum operating pressure bar 350

Minimum controlled pressure bar see Δp - Q diagram

Max flow rate in controlled lines

Max flow rate in the free lines

l/min

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: PRM3-PT, -AT, -BT, -BA

PRM3-DT, -D

1,3

1,8

PRM3-PT PRM3-AT

PRM3-BT PRM3-DT

PRM3-D PRM3-BA

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PRM3

SERIES 10

2 - CHARACTERISTIC CURVES

(values obtained with viscosity of 36 cSt at 50°C)

1 - IDENTIFICATION CODE

ADJUSTMENT

PRESSURE DROPS Δp - Q

3 - HYDRAULIC FLUIDS

Use mineral oil-based hydraulic fluids HL or HM type, according to ISO 6743-4. For these fluids, use NBR seals (code N). 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.

Seals:

N = NBR seals for mineral oils (standard)

V = FPM seals for special fluids

Series No. (the overall and mounting

dimensions remain unchanged from 10 to 19)

ISO 4401-03 size

Modular version

Pressure relief valve,

direct operated

P R M 3 - / 10 /

Adjustment type (See point 5):

S = with hexagonal socket screw

(standard)

K = Adjustment knob

Option: / W 7 surface treatment.

Omit if not required (NOTE)

1) pressure drops on

controlled lines with

calibrated screw at

the beginning of the

adjustment (minimum

controlled pressure)

2) pressure drops

on free lines

Versions:

PT = single on line P with discharge in T

AT = single on line A with discharge in T

BT = single on line B with discharge in T

DT = double on lines A-B with discharge in T

D = double on lines A-B with cross discharge

BA = single on line B with discharge in A

Pressure adjustment range:

025 = up to 25 bar

070 = up to 70 bar

140 = up to 140 bar

210 = up to 210 bar

350 = up to 350 bar

PRM3-*025

PRM3-*070

PRM3-*210

PRM3-*140

PRM3-*350

PRM3-*025

PRM3-*070

PRM3-*140

PRM3-*210

PRM3-*350

NOTE: The standard valve is supplied with surface treatment of phosphating black.

The zinc-nickel finishing on the valve body makes the valve suitable to ensure a salt spray resistance up to 240 hours.

(test operated according to UNI EN ISO 9227 standards and test evaluation operated according to UNI EN ISO 10289 standards).

PRM3-D, PRM3-DT

PRM3-PT, PRM3-BA, PRM3-BT

dimensions in mm

1 Locking nut: spanner 19

Hex socket adjustment screw:

spanner 6 (standard)

Rotate clockwise to increase pressure

Mounting surface with sealing rings:

4 OR type 2037 (9.25x1.78) 90 Shore

A B

PRM3-PT 105 157

PRM3-BA 100 152

PRM3-BT 100 152

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SERIES 10

4 - OVERALL AND MOUNTING DIMENSIONS

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SERIES 10

REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS.

PRM3-AT

dimensions in mm

1 Locking nut: spanner 19

Hex socket adjustment screw:

spanner 6 (standard)

Rotate clockwise to increase pressure

Mounting surface with sealing rings:

4 OR type 2037 (9.25x1.78) 90 Shore

5 - ADJUSTMENT KNOB

The standard valve is supplied with the hex socket adjustment screw. A version with

knob is also available.

Use the letter K in the identification code to order this version (see point 1).

1 Adjustment knob: K

2 Locking ring

dimensions in mm