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Description
- Size 6 … 30
- Component series 1X
- Maximum operating pressure 315 bar
- Maximum flow 400 l/min
Features
- For pipeline installation
- Related to pressure and viscosity
- Throttling in one direction of flow, free flow in opposite direction
- Corrosion-protected design
Product description
The valves type MK are pressure- and viscosity-dependent throttle check valves.
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.
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | |
| MK | G | 1X | / | * |
| 01 | 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 | For 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 (observe compatibility of seals with hydraulic fluid used, see "Technical data") | ||
| 06 | NBR seals | no code |
| FKM seals | V | |
| 07 | Further details in the plain text | * |
Notice:
For valve types for use in potentially explosive areas, refer to data sheet 07011.
Technical data
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 | NBR seals | °C | -30 … +80 | ||||||
| FKM seals | °C | -20 … +80 | |||||||
hydraulic
| Size | 6 | 8 | 10 | 15 | 20 | 25 | 30 | ||
| Maximum operating pressure | bar | 315 | |||||||
| Cracking pressure | bar | 0.5 | |||||||
| Maximum flow | See characteristic curves | ||||||||
| Leakage flow 1) | Standard | l/min | 0.8 | 1 | 2 | 3 | 4 | 5.5 | |
| Version "J3" and "J5" | l/min | 1.6 | 2.5 | 3.2 | 3.5 | 7 | 7.7 | ||
| Hydraulic fluid | see table "Hydraulic fluid" | ||||||||
| Hydraulic fluid temperature range | NBR seals | °C | -30 … +80 | ||||||
| FKM seals | °C | -20 … +80 | |||||||
| Viscosity range | mm²/s | 10 … 800 | |||||||
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 2) | Class 20/18/15 | ||||||||
| Load cycles | million | 10 | 2 | ||||||
| 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. For the selection of the filters, see www.boschrexroth.com/filter. |
| Hydraulic fluid | Classification | Suitable sealing materials | Standards | Data sheet | |
| Mineral oils | HL, HLP | NBR, FKM | DIN 51524 | 90220 | |
| Bio-degradable 1) | Insoluble in water | HETG | FKM | ISO 15380 | 90221 |
| HEES | FKM | ||||
| Soluble in water | HEPG | FKM | ISO 15380 | ||
| Flame-resistant | Water-free | HFDU (glycol base) | FKM | ISO 12922 | 90222 |
| HFDU (ester base) 1) | FKM | ||||
| HFDR | FKM | ||||
| Containing water 1) | 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:
| |||||
| 1) | Not recommended for corrosion-protected version "J3" and "J5" (contains zinc) |
(For applications outside these values, please consult us!)
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
Δp-qV characteristic curves via open throttle
Δp-qV characteristic curves via open throttle
Δp-qVcharacteristic curves via open check valve with closed throttle
Symbols/Circuit diagrams
Type MK
Dimensions
Dimensions in mm
| 1 | Valve marking on key face |
| NG | D1 | ØD2 | L | SW1 | SW2 | T |
| mm | mm | mm | mm | mm | ||
| 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 |
Downloads
 | Throttle and throttle check valve Data Sheet | RE27219 | 2018-10-01 | English | PDF | 233k Product Groups: Throttle valves Type MG and MK |
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