Flow Control Valves
Series MTKA, MTQA
1/6
Reference: 100-P-000046-EN-11
Issue: 06.2021
S robust, uncomplicated, reliable
S these valves do not require maintenance. This lowers
costs and reduces the risk of a system
failure.
S can be provided with mechanical actuation
S flow rates are unaffected by temperature change or
when the higher load pressure alternates between the
outlet ports
S line mounting design
1 Description
1.1 MTKA flow control valve
The MTKA priority flow control valve divides the inlet flow P
into a priority flow A (fixed, or manually adjustable) and a
surplus flow B. The surplus flow can be pressurised and can
therefore be supplied to an additional actuator. The pres-
sure in the inlet line corresponds to that of the actuator with
the highest load.
For applications with high vibrations we recommend the
version with detent (MTKAR).
When used as a 2-way flow control valve, the surplus flow
outlet port (B) is plugged. For this application, please order
the .../20 special feature.
1.2 MTQA flow control valve
The MTQA priority flow control valve divides the inlet flow P
into a priority flow A (fixed, or manually adjustable) and a
surplus flow R. The whole inlet flow is protected by an ad
justable pressure relief valve. The surplus flow from port R
should be returned directly to tank. The pressure in the inlet
line corre-sponds to that of the actuator.
The pressure relief valve is set by the factory according to
the customer's specifications and provided with a safety
cap.
For applications with high vibrations we recommend the
version with detent (MTQAR).
1.3 Application examples
The valves are used to regulate the speed of hydraulic actu
ators (cylinders, motors, etc.).
S Harvesters
S Municipal vehicles
S Forestry machines
S Construction equipment
S External propelled OFF-Highway machines
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Flow Control Valves MTKA, MTQA
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2 Symbols
2.1 MTKA...
3-way flow control valve
Priority flow is fixed
3-way flow control valve
Priority flow is fixed
Bypass check valve from A P
3-way flow control valve
Priority flow is adjustable by handwheel
3-way flow control valve
Priority flow is adjustable by handwheel
Bypass check valve from A P
A Priority flow P Pump
B Surplus flow (can be pressurised)
2.2 MTQA...
3-way flow control valve
Priority flow is fixed
Pressure relief valve for P
3-way flow control valve
Priority flow is fixed
Pressure relief valve for P
Bypass check valve from A P
3-way flow control valve
Priority flow is adjustable by
handwheel
Pressure relief valve for P
3-way flow control valve
Priority flow is adjustable by
handwheel
Pressure relief valve for P
Bypass check valve from A P
A Priority flow P Pump
R Return line to tank
3 Technical data
Hydraulical characteristics Unit Description, value
Maximum operating pressure bar 315
Nominal flow rate Q (inlet flow) l/min max. 70
Priority flow, fixed setting
1)
l/min min. 3; max. 65 (in steps of 1 l)
Priority flow, adjustable
1)
l/min 0 … 65
Control accuracy $ 5 %
Pressure differential p bar 3,5 … 5
Fluids mineral oil to DIN 51524 (other fluids on request)
Fluid cleanliness ISO 4406 class 20/18/15
Fluid temperature range °C -20 … +80
Viscosity range mm
2
/s 10 … 300
Leakage, priority flow, at min. control setting
2)
cm
3
/min max. 50 (for MTKA.../20” max. 250)
1) For other priority flows/flow ranges, contact Bucher Hydraulics. 2) Measured with surplus flow not under pressure and 30mm³/s.
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Flow Control Valves MTKA, MTQA
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4 Performance graphs
The values refer to a viscosity of 33 mm
2
/s. Flow from P to
A varies with the scale setting (adjustable models).
scale position
Q [%]
100
75
50
25
0
024 6
810
+5%
-5%
125
5 Dimensions (all dimensions in mm)
5.1 MTKA
1
2
84
68
41,5
84
74
22,5
44,5
7
Ø38
Ø44
112
143
36
Ø
31
32
32
fixed adjustable
1 Surplus flow (option …/20 plugged ) 2 Priority flow
5.1.1 Connection size
Port MTKA…-.M.. MTKA…-.G..
P
M22 x 1,5 G½“
A
B
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Flow Control Valves MTKA, MTQA
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5.2 MTQA
119
74
38
41,5
34
34
31
36
MTQAV..
1
2
3
55
44
22
7
112
84
84
32
32
142
fixed
adjustable
R
A
P
R
A
P
1 Pressure setting stamped here 2 Priority flow
3 Return line to tank
5.2.1 Connection size
Port MTQA…-.M.. MTQA…-.G..
P
M22 x 1,5 G½“
A
B
6 Ordering information
6.1 Model code and ID number for quick order MTKAV*
Model code ID number
MTKAVE*-2G12 100028121
MTKAVG*-2G12 100034324
MTKAVA*-2G12 100020982
MTKAVK*-2G12 100027627
MTKAVB*-2G12 100021709
MTKAVH*-2G12 100030048
MTKAVC*-2G12 100021342
MTKAVD*-2G12 100021343
Model code ID number
MTKAVE*-2M22 100029168
MTKAVG*-2M22 100032189
MTKAVA*-2M22 100020694
MTKAVK*-2M22 100031440
MTKAVB*-2M22 100020906
MTKAVH*-2M22 100026268
MTKAVC*-2M22 100020899
MTKAVD*-2M22 100021618
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Flow Control Valves MTKA, MTQA
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6.2 Model code key
6.2.1 MTKA
Flow control valve MTKA,
Priority flow range [l/min]
Adjustable
0 - 6 = VE 0 - 8 = VG 0 - 12 = VA 0 - 20 = VK
0 - 25 = VB 0 - 35 = VH 0 - 50 = VC 0 - 65 = VD
Adjustable with detent
0 - 6 = RE 0 - 8 = RG 0 - 12 = RA 0 - 20 = RK
0 - 25 = RB 0 - 35 = RH 0 - 50 = RC 0 - 65 = RD
Fixed priority flow rate
1)
Min. 3 l; max. 65 l (in steps of 1 l) = e.g. 09
Bypass check valve from A to P = R
without = *
Design no.
(to be inserted by the factory)
Ports A, B and P M22x1,5 = M22
G 1/2” = G12
Option .../20 = 2-way-flow control valve
M2 2 /-MT KA VA R
1)
Setting with HLP46 and 50°C (30 mm²/s)
6.2.2 MTQA
Stromregelventil MTQA
Priority flow range [l/min]
Adjustable
0 - 6 = VE 0 - 8 = VG 0 - 12 = VA 0 - 20 = VK
0 - 25 = VB 0 - 35 = VH 0 - 50 = VC 0 - 65 = VD
Adjustable with detent
0 - 6 = RE 0 - 8 = RG 0 - 12 = RA 0 - 20 = RK
0 - 25 = RB 0 - 35 = RH 0 - 50 = RC 0 - 65 = RD
Fixed priority flow rate
1)
= e.g. 09
Min. 3 l; max. 65 l (in steps of 1 l)
Bypass check valve from A to P = R
without = *
Design no.
(to be inserted by the factory)
Ports A, R and P M22x1,5 = M22
G 1/2” = G12
Setting for Pressure relief valve in P
1)
minimum 40 bar, maximum 315 bar (in steps of 5 bar ) = z.B. 250
M 2 2 P=250-MT
QA
VA R
1)
Setting with HLP46 and 50°C (30 mm²/s)
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Flow Control Valves MTKA, MTQA
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7 Mounting instructions
Expert and product knowledge is required for the layout of
this valve type. Use exclusively for the intended purpose wi
thin the indicated values. The valve manufacturer must be
consulted for use of the appliance outside the specifica
tions. All applications must be verified by sufficient tests to
ensure safety in the application. The ultimate responsibility
for safety during installation and use resides with the end
appliance manufacturer.
CAUTION:
Maintenance work may only be performed by expert per
sonnel with mechanical knowledge. In principle, only the se
aling parts may be replaced or checked. When replacing
seals, ensure that they are well oiled or greased before
mounting.
E 2021 by Bucher Hydraulics GmbH, D-79771 Klettgau
www.bucherhydraulics.cominfo.kl@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.310.330
