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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

QTM3

FLOW RESTRICTOR VALVE

SERIES 10

HYDRAULIC SYMBOLS

OPERATING PRINCIPLEMOUNTING INTERFACE

— This is a non-compensated flow control valve with a check

valve for reverse free flow. It is made in modular version

and with mounting surface according to the ISO 4401

standards; it can be assembled quickly without the use of

pipes, but using only suitable tie-rods or bolts, thus forming

compact modular groups.

— It is also available as a reversible valve (G* versions). The

control takes place as meter-in or meter-out, depending on

the way in which the valve is facing the OR subplate.

— The built-in check valve allows the reverse free flow

(cracking pressure of 0.5 bar).

— It can be supplied with adjustment by hexagonal socket

screw or by knob.

MODULAR VERSION

ISO 4401-03

p max

350 bar

Q max (see table of performances)

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

Maximum operating pressure

Check valve cracking pressure

bar

350

0.5

Maximum flow rate in the controlled lines

Maximum flow rate in the free lines

Min. controlled flowrate with Δp 10 bar

l/min

≤0.060

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 1.3

ISO 4401-03-02-0-05

(CETOP 4.2-4-03-350)

QTM3-D

QTM3-GD

QTM3-RD

QTM3-SA

QTM3-GSA

QTM3-SB

QTM3-GSB

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SERIES 10

2 - CHARACTERISTIC CURVES

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

1 - IDENTIFICATION CODE

Series No.

(the overall and mounting dimensions

remain unchanged from 10 to 19)

Configurations:

D: meter-out control in lines A and B (standard)

RD: meter-in control in lines A and B

SA: meter-out control in line A

SB: meter-out control in line B

Configurations G* - reversible valve (NOTE 1)

GD: control in lines A and B

GSA: control in line A

GSB: control in line B

ISO 4401-03 size

Flow restrictor valve

with check valve

for reverse free flow

Adjustment type:

S = with hexagonal socket screw (standard)

CK3 = with push, adjust, lock knob

(see point 6)

ADJUSTMENT

PRESSURE DROPS Δp - Q

Q T M 3 - / 10 /

KNOB TURNS

only for QTM3-*B

only for QTM3-*A

3 - 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.

NOTE 1: The valve body does not provide the OR seats. The mounting interface is achieved by interposition of an OR subplate (included

in the delivery). The control of flow (meter-in or meter-out) is depending on the way of assembly the valve on the subplate.

NOTE 2: 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).

Modular version

Seals:

N = NBR seals for mineral oil (standard)

V = FPM seals for special fluids

Option:

/ W 7 = Zinc-nickel surface

treatment (see NOTE 2)

Omit if not required

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SERIES 10

4 - QTM3 -D, -RD AND -S* - OVERALL AND MOUNTING DIMENSIONS

dimensions in mm

QTM3-D

QTM3-RD

QTM3-SB

adjustment screw on QTM3-SA

1 Mounting surface with sealing rings:

N. 4 OR type 2037 (9.25x1.78)

90 Shore

2 Socket hex adjustment screw:

Hex key 6

Rotate anticlockwise to increase flow

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SERIES 10

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

5 - QTM3-G* - OVERALL AND MOUNTING DIMENSIONS

dimensions in mm

OR subplate code 1955131

(included in the supply):

N. 4 KANTSEAL DKAR00012

(70 Shore)

Socket hex adjustment screw:

Hex key 6

Rotate anticlockwise to increase flow

Identification plate

QTM3-GD

QTM3-GSB

adjustment screw on QTM3-GSA

meter-in

control

meter-out

control

6 - ADJUSTMENT KNOB

Valves can be supplied with adjustment knob, which is engaged by pushing and twisting at

the same time. When released, the knob disengages to secure the adjustment from

involuntary tampering.

Add CK3 in the identification code to order this version (see point 1).