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64 411/121 ED

QTM7

FLOW RESTRICTOR VALVE

SERIES 20

HYDRAULIC SYMBOLS

OPERATING PRINCIPLEMOUNTING INTERFACE

— This is a throttle check valve, in modular version. Mounting

surface is according to ISO 4401-07 standards.

— It can be assembled quickly under all ISO 4401-07

modular valves without use of pipes, using suitable tie-

rods or bolts, thus forming compact modular groups.

— It is available in two versions: for meter-out flow control in

one (A port) or both actuator ports, independent.

— It is supplied with socket hex adjustment screw and

locking nut. Rotate anticlockwise to increase the flow rate.

MODULAR VERSION

ISO 4401-07

p max 350 bar

Q max 300 l/min

ISO 4401-07-07-0-05

(CETOP 4.2-4-07)

Maximum operating pressure

bar 350

Maximum flow rate

l/min 300

Check valve opening pressure

bar 0,7

Ambient temperature range

°C -25 / +80

Fluid temperature range

°C -25 / +80

Fluid viscosity range

cSt 10 ÷ 400

Fluid contamination degree

According to ISO 4406:1999

class 20/18/15

Recommended viscosity

cSt 25

Mass: QTM7-SA

QTM7-D

6.9

PERFORMANCES

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

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QTM7

SERIES 20

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

2 - CHARACTERISTIC CURVES

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

1 - IDENTIFICATION CODE

controlled flow

versus Δp

with different

restrictor

opening values

CONTROLLED FLOW

adjustment screw turns

PRESSURE DROPS Δp - Q

dimensions in mm

1) pressure drops through the

check valve with closed

restrictor

2) pressure drops through the

free ports

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)

SA = meter-out control on line A

D = meter-out control on lines A and B

Modular version

Throttle check valve

ISO 4401-07 size

Adjustment screw

Q T M 7 - / 20 / S

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.

4 - OVERALL AND MOUNTING DIMENSIONS

Mounting surface with sealing rings:

4 OR type 130 (22.22x2.62)

2 OR type 2043 (10.82x1.78)

Socket hex adjustment screw: Allen key 8

Rotate anticlockwise to increase the flow

3 Locking nut: spanner 24