RE 27219, edition: 2018-10, Bosch Rexroth AG
Throttle and
throttlecheckvalve
Features
▶ For pipeline installation
▶ Depending on viscosity and pressure
▶ Type MG: throttling in both directions of flow
▶ Type MK: throttling in one direction of flow, free flow
inopposite direction
▶ Corrosion-protected design
Contents
Features 1
Ordering code 2
Symbols 2
Function, section 3
Technical data 4
Characteristic curves 5
Dimensions 6
Further information 6
▶ Size 6 … 30
▶ Component series 1X
▶ Maximum operating pressure 315bar
▶ Maximum flow 400 l/min
RE 27219 
Edition: 2018-10
Replaces: 01.09
H7793
Type MG and MK
Inhalt
Features 1
Contents 1
Ordering code 2
Symbols 2
Function, section 3
Technical data
(for applications outside these values, please consult us!) 4
Characteristic curves
(measured with HLP46, ϑ
oil
= 40 ±5 °C) 5
Dimensions
(dimensions in mm) 6
Further information 6
Notes 7
Notes 8
2/6 MG; MK | Throttle and throttle check valve
Bosch Rexroth AG, RE 27219, edition: 2018-10
Ordering code
01 Throttle valve MG
Throttle check valve MK
02 Size 6 6
Size 8 8
Size 10 10
Size 15 15
Size 20 20
Size 25 25
Size 30 30
03 Threaded connection G
04 Component series 10 … 19 (10 … 19: unchanged installation and connection dimensions) 1X
Corrosion resistance (outside)
05 None (valve housing primed) no code
Improved corrosion protection (240 h salt spray test according to ENISO9227) J3
Improved corrosion protection (720 h salt spray test according to ENISO9227) J5
Seal material
06 NBR seals no code
FKM seals V
Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
07 Further details in the plain text *
01 02 03 04 05 06 07
G 1X / *
Symbols
Type MG Type MK
Notes:
▶ For valve types for use in potentially explosive areas, refer to
data sheet 07011.
▶ Preferred types and standard units are contained in the EPS
(standard price list).
1243
1243 65
Throttle and throttle check valve | MG; MK 3/6
RE 27219, edition: 2018-10, Bosch Rexroth AG
Function, section
The valve types MG and MK are pressure- and viscosity-
dependent throttle and throttle check valves.
Type MG (throttle valve)
Throttling is realized in both directions of flow. The
hydraulic fluid is directed to the throttling point (4) via
lateral bores (3). It is formed between the housing (2)
andthe adjustable sleeve (1). By rotating the sleeve (1),
the cross-section of the throttling point (4) can be
continuously adjusted.
Type MG
Type MK
Type MK (throttle check valve)
If the valve is passed by the flow in throttling direction,
the spring (6) and the hydraulic fluid push the poppet (5)
on the seat and the connection is blocked. Via lateral
bores(3), the hydraulic fluid flow is directed to the
throttling point (4) between the housing (2) and the
adjustable sleeve (1).
In the opposite direction, the pressure acts on the front
face of the poppet (5), lifts it from the seat and releases
the flow. The hydraulic fluid flow is released through the
valve without throttling. In this process, simultaneous
passing of a part of the hydraulic fluid via the annular
gap leads to the desired effect of self-cleaning.
4/6 MG; MK | Throttle and throttle check valve
Bosch Rexroth AG, RE 27219, edition: 2018-10
Technical data
(for applications outside these values, please consult us!)
1)
If valve is completely closed
2)
The cleanliness classes specified for the components must be
adhered to in hydraulic systems. Effective filtration prevents
faults and simultaneously increases the life cycle of the
components.
Available filters can be found at www.boschrexroth.com/filter.
3)
Not recommended for corrosion-protected versions "J3" and "J5"
General
Size 6 8 10 15 20 25 30
Weight kg 0.3 0.4 0.7 1.1 1.9 3.2 4.1
Installation position any
Ambient temperature range °C –30 ... +80 (NBR seals)
–20 … +80 (FKM seals)
hydraulic
Maximum operating pressure bar 315
Cracking pressure (type MK) bar 0.5
Maximum flow l/min see characteristic curves on page 5
Maximum leakage
1)
▶ Standard l/min 0.8 1.0 2.0 2.0 3.0 4.0 5.5
▶ Version "J3" and "J5" l/min 1.6 1.6 2.5 3.2 3.5 7.0 7.7
Hydraulic fluid see table below
Hydraulic fluid temperature range °C –30 ... +80 (NBR seals)
–20 … +80 (FKM seals)
Viscosity range mm
2
/s 10 … 800
Maximum admissible degree of contamination of the
hydraulic fluid; cleanliness class according to ISO4406 (c)
Class 20/18/15
2)
Load cycles ▶ Size 6 … 15 10 Mio.
▶ Size 20 … 30 2 Mio.
Hydraulic fluid Classification Suitable
Sealing materials
Standards Data sheet
Mineral oils HL, HLP NBR, FKM DIN51524 90220
Bio-degradable
3)
▶ Insoluble in water HETG FKM
ISO15380
90221HEES FKM
▶ Soluble in water HEPG FKM ISO15380
Flame-resistant ▶ Water-free HFDU (glycol base) FKM
ISO12922 90222HFDU (ester base)
3)
FKM
HFDR FKM
▶ Containing water
3)
HFC (Fuchs Hydrotherm 46M,
Fuchs Renosafe 500, Petrofer
Ultra Safe 620, Houghton
Houghto Safe 620, Union
Carbide HP5046)
NBR
ISO12922 90223
Important information on hydraulic fluids:
▶ For further information and data on the use of other hydraulic
fluids, please refer to the data sheets above or contact us.
▶ There may be limitations regarding the technical valve data
(temperature, pressure range, life cycle, maintenance
intervals,etc.).
▶ The ignition temperature of the hydraulic fluid used must be
50Khigher than the maximum surface temperature.
▶ Flame-resistant – containing water:
– Maximum pressure differential 210 bar, otherwise, increased
cavitation erosion
– Life cycle as compared to operation with mineral oil HL,
HLP30 … 100%
– Maximum hydraulic fluid temperature 60 °C
▶ Bio-degradable and flame-resistant: If this hydraulic fluid
is used, small amounts of dissolved zinc may get into the
hydraulic system.
0102
04
030 50
1
2
3
12
3
050 100 200150
1
2
3
0 100 200 400300
1
2
3
6
7
400
0,1
0,5
1
2
3
4
6
8
10
20 60 80 100 120
12
3
4
1000
0,1
0,5
1
2
3
4
6
8
10
200 300 400
5
6
7
Throttle and throttle check valve | MG; MK 5/6
RE 27219, edition: 2018-10, Bosch Rexroth AG
Characteristic curves
(measured with HLP46, ϑ
oil
= 40 ±5 °C)
Flow in l/min →
Pressure differential in
bar
→
∆p-q
V
characteristic curves vie opened check valve at closed throttle (type MK)
1 NG6
2 NG8
3 NG10
4 NG15
5 NG20
6 NG25
7 NG30
Flow in l/min →
Pressure differential in
bar
→
Flow in l/min →
Pressure differential in
bar
→
Flow in l/min →
Pressure differential in
bar
→
Pressure differential in
bar
→
∆p-q
V
characteristic curves via open throttle (type MG and MK)
Flow in l/min
→
D1
1
1
05
L
T
D1
SW1
T
ØD2
SW2
Bosch Rexroth AG, RE 27219, edition: 2018-10
6/6 MG; MK | Throttle and throttle check valve
Bosch Rexroth AG
Industrial Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 40 30 20
my.support@boschrexroth.de
www.boschrexroth.de
© All rights reserved to Bosch Rexroth AG, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event
of applications for industrial property rights.
The data specified above only serve todescribe the product. No statements
concerning a certain condition or suitability for a certain application can be
derived from our information. The information given does not release the user
from the obligation of own judgment and verification.
It must be remembered that our products are subject to a natural process
of wear and aging.
Dimensions
(dimensions in mm)
NG D1 ØD2 L SW1 SW2 T
6 G1/4 34 65 22 32 12
8 G3/8 38 65 24 36 12
10 G1/2 48 80 30 46 14
15 G3/4 58 100 41 55 16
20 G1 72 110 46 70 18
25 G1 1/4 87 130 55 85 20
30 G1 1/2 93 150 60 90 22
Further information
▶ Hydraulic fluids on mineral oil basis Data sheet 90220
▶ Environmentally compatible hydraulic fluids Data sheet 90221
▶ Flame-resistant, water-free hydraulic fluids Data sheet 90222
▶ Flame-resistant hydraulic fluids - containing water (HFAE, HFAS, HFB, HFC) Data sheet 90223
▶ Hydraulic valves for industrial applications Operating instructions 07600-B
▶ General product information on hydraulic products Data sheet 07008
▶ Assembly, commissioning and maintenance of industrial valves Data sheet 07300
▶ Use of non-electrical hydraulic components in explosive atmospheres (ATEX) Data sheet 07011
▶ Selection of filters www.boschrexroth.com/filter
▶ Information on available spare parts www.boschrexroth.com/spc
1 Valve marking on key face
Throttle and throttle check valve | MG; MK 7/6
RE 27219, edition: 2018-10, Bosch Rexroth AG
Bosch Rexroth AG
Industrial Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 40 30 20
my.support@boschrexroth.de
www.boschrexroth.de
© All rights reserved to Bosch Rexroth AG, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event
of applications for industrial property rights.
The data specified above only serve todescribe the product. No statements
concerning a certain condition or suitability for a certain application can be
derived from our information. The information given does not release the user
from the obligation of own judgment and verification.
It must be remembered that our products are subject to a natural process
of wear and aging.
Notes
Bosch Rexroth AG, RE 27219, edition: 2018-10
8/6 MG; MK | Throttle and throttle check valve
Bosch Rexroth AG
Industrial Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 40 30 20
my.support@boschrexroth.de
www.boschrexroth.de
© All rights reserved to Bosch Rexroth AG, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event
of applications for industrial property rights.
The data specified above only serve todescribe the product. No statements
concerning a certain condition or suitability for a certain application can be
derived from our information. The information given does not release the user
from the obligation of own judgment and verification.
It must be remembered that our products are subject to a natural process
of wear and aging.
Notes