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Description
- Size 6 … 30
- Component series 1X
- Area of application in accordance with the Explosion Protection Directive 2014/34/EU: I M2, II 2G, II 2D
- Type of protection of the valve solenoids: c (EN 13463-5)
Features
- As ATEX unit according to directive 2014/34/EU for areas of application: IM2, II2G, II2D
- As type-examination tested safety valve according to Pressure Equipment Directive 2014/68/EU
- As screw-in cartridge valve (cartridge)
- For threaded connection
- For subplate mounting
- Adjustment with hand wheel
- Information on safety:
Area of application as a type-examination tested valve according to the Pressure Equipment Directive 2014/68/EU
Product description
Valves of type DBDH…XC…E are type-examination tested, direct operated pressure relief valve according to Pressure Equipment Directive 2014/68/EU. They are used for limiting a system pressure and are intended for use as safety valves.
If the pre-set response pressure at the channel P is exceeded, the valves respond and internally connect channel P and channel T. Depending on their variant, the valves are designed as screw-in cartridge valve (“K”) for screw-in in block designs, as valve with threaded connection (“G”) or as valve for subplate mounting (“P”).
The actual screw-in cartridge valve used in all variants basically consists of sleeve (7), spring (6), poppet (5.1, response pressures up to 400 bar) or ball (5.2, response pressures from 405 bar), valve seat (4) and the adjustment element (8).
The spring presses the poppet (5.1) and/or the ball (5.2) onto the valve seat (4). At the factory, the response pressure is set to a fixed value using the adjustment element; afterwards, the valve is sealed.
The channel P is connected to the system. The pressure existing in the system acts on the poppet and/or the ball.
If the pressure in the channel P increases above the value specified by the preload of the spring, the poppet and/or the ball is lifted off the valve seat against the spring force and connects channel P and T. The hydraulic fluid flows from the channel P into the channel T. The maximum possible stroke of the poppet is limited by structural measures.
The valves are available with graded response pressures (in 5 bar steps). The valve spring can be unloaded by means of the hand wheel and a response pressure lower than that of the factory setting can be set without the need of removing the lead seal. See operating instructions.
Screw-in cartridge valve Type DBDH 10 K1X/...XC...E, response pressures 30 ... 400 bar
Related symbol
Response pressures 405 ... 630 bar (ball seat valve NG10)
Sample figure
1,2 | Support ring, O-ring at the valve body |
3 | Axial sealing with individual seal |
Type code
01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | |
DBD | H | 1X | / | XC | E |
01 | Pressure relief valve, direct controlled | DBD |
Adjustment type for pressure adjustment | ||
02 | Hand wheel | H |
03 | Size 6 | 6 |
Size 10 | 10 | |
Size 20 | 20 | |
Size 30 | 30 | |
Version | ||
04 | Screw-in cartridge valve (cartridge) | K |
Threaded connection | G | |
Subplate mounting | P | |
05 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
Set response pressure in bar | ||
06 | Size 6 | 30...400 |
Size 10 | 30...630 | |
Size 20 | 30...400 | |
Size 30 | 30...315 | |
07 | "Structural safety", for details, please refer to the "Information on explosion protection" | XC |
Seal material | ||
08 | FKM seals | V |
NBR seals 1) | no code | |
Observe compatibility of seals with hydraulic fluid used. | ||
09 | Type-examination tested safety valve according to Pressure Equipment Directive 2014/68/EU | E |
1) | Only possible for NG10 and pressure ratings < 315 bar |
Technical data
general
Size | 6 | 10 | 20 | 30 | ||
Installation position | any | |||||
Ambient temperature range | NBR seals | °C | -30 … +80 | |||
FKM seals | °C | -20 … +80 | ||||
Storage temperature range | NBR seals | °C | -30 ... +80 | |||
FKM seals | °C | -20 ... +80 | ||||
Weight | see chapter dimensions | |||||
Surface protection for designs “G” and “P” | Coating, layer thickness max. 100 μm | |||||
Protection class according to EN 60529+A1 | IP65 |
hydraulic (measured at a viscosity ν = 32 mm2/s and a hydraulic fluid temperature of 40 °C)
Size | 6 | 10 | 20 | 30 | ||
Set response pressure | bar | see last figure of the component marking | ||||
Maximum counter pressure in the discharge line | bar | See characteristic curves "Counter pressure in the discharge line” | ||||
Maximum flow | l/min | see characteristic curves “Maximum flow” | ||||
Hydraulic fluid | see table | |||||
Hydraulic fluid temperature range | as standard valve | °C | -15 … +80 | |||
as safety valve | °C | -10 … +60 | ||||
Viscosity range | as standard valve | mm²/s | 12 … 800 | |||
as safety valve | mm²/s | 12 … 230 | ||||
Maximum admissible degree of contamination of the hydraulic fluid 1) | Class 20/18/15 according to ISO 4406 (c) |
1) | 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 |
Important information on hydraulic fluids:
|
Information on explosion protection
Area of application according to directive 2014/34/EU | IM2, II2G | IM2, II2D | |
Type of protection valve | c (EN 13463-5) | ||
Maximum surface temperature | °C | 125 | 114 |
Temperature class | T4 | - | |
Protection class | - | IP65 |
Special application conditions for a safe application:
- The screw-in cartridge valve (cartridge) must not be painted.
Diagrams/characteristic curves
Size 6
Size 10
Size 20
Size 30
Notes:
- Value pairs located in the areas of the characteristic curves with gray background can not be realized with the valve.
- The characteristic curves shown here are only valid for a counter pressure of 0 bar in the discharge line.
Counter pressure in the discharge line
Basically, the valve should be operated without counter pressure in the discharge line, if possible. With counter pressure in the discharge line, the maximum flow possible is reduced. There is a relation between the maximum counter pressure pT in the discharge line and flow qV, which can be seen from the following characteristic curves. Characteristic curves for intermediate values of the response pressure which are not listed must be determined by means of interpolation.
With a flow approaching zero, the maximum counter pressure pT is in each case 10 % of the response pressure. With increasing flow, the maximum counter pressure pT is reduced.
Interpolation of intermediate values from the diagram
- At the pT axis, mark 1/10 of the value of pA.
- Determine the next lower and the next higher characteristic curve for this point. The point marked at pT divides the section between lower and higher characteristic curve on the pT axis with a certain percentage.
- At the qVmax axis, divide the section between next lower and next higher characteristic curve in the same percentage as the section at the pT axis. From the zerocrossing on the qVmax axis determined in that way, draw a straight line to the value on the pT axis marked before.
- Mark the system flow to be secured at the qVmax axis.
- Read off the maximum counter pressure for this value using the line at the pT axis drawn before.
Determination of the maximum counter pressure
Example 1 (with already existing characteristic curve):
- Flow of the system / accumulator to be secured: qVmax = 115 l/min
- Safety valve set to: pA = 315 bar.
- Read off the maximum counter pressure pT of approx. 22,5 bar from the diagram (see arrows, Size 6, characteristic curve 7).
Example 2 (with interpolated characteristic curve):
- Flow of the system / accumulator to be secured: qVmax = 15 l/min
- Safety valve set to: pA = 80 bar.
- Value to be marked at the axis referred to as pT: 1/10 x 80 bar = 8 bar.
- Read off the maximum counter pressure pT of approx. 3 bar from the diagram (see arrows, dashed characteristic curve).
Size 6
Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DBD... with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".
pA | Response pressure in bar |
pT | Maximum counter pressure in the discharge line (port T) in bar |
qVmax | Maximum flow in l/min |
▢ | | Interpolation area |, for valves with response pressure pA = 30 ... 110 bar and maximum flow qVmax = 14 ... 27 l/min |
▢ ‖ | Interpolation area ‖, for valves with response pressure pA = 115 ... 400 bar and maximum flow qVmax = 52 l/min |
Size 10
Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DBD... with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".
pA | Response pressure in bar |
pT | Maximum counter pressure in the discharge line (port T) in bar |
qVmax | Maximum flow in l/min |
▢ ▢ | Interpolation areas |
Size 20
Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DBD... with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".
Size 30
Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DBD... with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".
Dimensions
Screw-in cartridge valve "K"
(Dinension im mm)
NG6 … NG30
Dimensions in mm
1 | Adjustment type (Hand wheel) |
2 | Lock nut, wrench size 19 mm |
3 | Depth of fit |
4 | Port T, at any place at the circumference |
5 | Port P, at any place at the circumference or at the front side |
Tolerance: DIN 7167 and ISO 14405 General tolerances: ISO 2768-mk |
1) | Maximum dimension |
2) | Maximum dimension with lowest set response pressure |
3) | Edge at the seal ring insertion face rounded and free of burrs |
4) | All seal ring in sertion faces are rounded and free of burrs; tolerance for all angles ± 0.5° |
Cartridge valve
NG | ØD13 | L23 | L24 | SW1 | Weight (approx.) |
mm | mm | mm | mm | kg | |
6 | 40 | 81 | 64.5 | 32 | 0.4 |
10 | 40 | 77 | 77 | 36 | 0.5 |
20 | 40 | 71 | 106 | 46 | 1 |
30 | 80 | 97 | 131 | 60 | 2.2 |
Tightening torques MA in Nm for screw-in cartridge valves
NG | Pressure rating in bar | ||
Up to 200 | Up to 400 | Up to 630 | |
6 | 50±5 | 80±5 | ‒ |
10 | 100±5 | 150±10 | 200±10 |
20 | 150±10 | 300±15 | ‒ |
30 | 350±20 | 500±30 | ‒ |
The tightening torques are guidelines with a friction coefficient μtotal = 0.12 and when using a manual torque wrench. |
Mounting cavity
NG | D14 | ØD15 | ØD16 | ØD17 | ØD18 | ØD19 | L25 | L26 | L27 | L28 | L29 | L30 | L31 | α1 | |||
mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | ° | |||
6 | M28 x 1.5 | 25 | H9 | 6 | 15 | 24.9 | + 0.152 - 0.2 | 12 | 15 | 19 | 30 | 36 | 45 | 56.5 | ± 5.5 | 65 | 15 |
10 | M35 x 1.5 | 32 | H9 | 10 | 18.5 | 31.9 | + 0.162 - 0.2 | 15 | 18 | 23 | 35 | 41.5 | 52 | 67.5 | ± 7.5 | 80 | 15 |
20 | M45 x 1.5 | 40 | H9 | 20 | 24 | 39.9 | + 0.162 - 0.2 | 22 | 21 | 27 | 45 | 55 | 70 | 91.5 | ± 8.5 | 110 | 20 |
30 | M60 x 2 | 55 | H9 | 30 | 38.75 | 54.9 | + 0.174 - 0.2 | 34 | 23 | 29 | 45 | 63 | 84 | 113.5 | ± 11.5 | 140 | 20 |
Subplate mounting "P"
(Dimension im mm)
NG6 … NG30
Dimensions in mm
Required surface quality of the valve contact surface |
1 | Screw-in cartridge valve, sample representation |
2 | Connection bore (P), e.g. for pressure measurement, upon delivery closed by means of a plug screw. |
3 | Name plate |
4 | Locating pin |
5 | Valve contact surface |
6 | 4 valve mounting bores |
Tolerance: DIN 7167 and ISO 14405 General tolerances: ISO 2768-mk |
For reasons of stability, use exclusively the following valve mounting screws (separate order):
4 hexagon socket head cap screws ISO 4762...-flZn-240h-L
(friction coefficient µtotal = 0.09 … 0.14)
Valve mounting screws according to ISO 4762 | |||
NG | Dimensions | Property class | Material number |
6 | M6 x 50 | 10.9 | R913000151 |
10 | M8 x 70 | 10.9 | R913000149 |
20 | M8 x 90 | 10.9 | R913000150 |
30 | M10 x 110 | 10.9 | R913000148 |
Pressure relief valve
NG | B1 | B2 | ØD1 | D2 | ØD3 | ØD4 | H2 | H3 | L1 | L2 | L3 | L4 | L5 | L6 | L7 | (P) | T1 | T2 | Weight (approx.) |
mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | kg | ||||
6 | 45 | 60 | 6.6 | M6 | 6 | 7.5 | 40 | 20 | 80 | 4 | 15 | 55 | 40 | 20 | 15 | G1/4 | 15 | 6.5 | 1.5 |
10 | 60 | 80 | 9 | M8 | 10 | 7.5 | 60 | 30 | 100 | 4 | 20 | 70 | 45 | 21 | 15 | G1/2 | 15 | 6.5 | 3.7 |
20 | 70 | 100 | 9 | M8 | 20 | 7.5 | 70 | 35 | 135 | 5.5 | 20 | 100 | 65 | 34 | 15 | G3/4 | 22 | 6.5 | 6.4 |
30 | 100 | 130 | 11 | M10 | 30 | 7.5 | 90 | 45 | 180 | 5.5 | 25 | 130 | 88 | 35 | 15 | G1 1/4 | 22 | 6.5 | 13.9 |
NG | Maximum total length with lowest set response pressure |
6 | 165 mm |
10 | 181 mm |
20 | 212 mm |
30 | 283 mm |
Threaded connection "G"
(Dimension im mm)
NG6 … NG30
Dimensions in mm
1 | Screw-in cartridge valve, sample representation |
2 | Connection bore (P), e.g. for pressure measurement, with plug screw. |
3 | Name plate |
4 | 4 valve mounting bores |
Tolerance: DIN 7167 and ISO 14405 General tolerances: ISO 2768-mk |
Pressure relief valve
NG | B1 | B2 | ØD1 | D2 | ØD3 | D4 | H1 | H2 | H3 | L1 | L2 | L3 | L4 | L5 | L6 | T1 | (P) | Weight (approx.) |
mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | kg | ||||
6 | 45 | 60 | 25 | G1/4 | 6.6 | M6 | 25 | 40 | 20 | 80 | 4 | 15 | 55 | 40 | 20 | 10 | G1/4 | 1.5 |
10 | 60 | 80 | 34 | G1/2 | 9 | M8 | 40 | 60 | 30 | 100 | 4 | 20 | 70 | 48 | 21 | 15 | G1/2 | 3.7 |
20 | 70 | 100 | 47 | G1 | 9 | M8 | 50 | 70 | 35 | 135 | 5.5 | 20 | 100 | 65 | 34 | 18 | G1 | 6.4 |
30 | 100 | 130 | 65 | G1 1/2 | 11 | M10 | 60 | 90 | 45 | 180 | 5.5 | 25 | 135 | 85 | 35 | 20 | G1 1/2 | 13.9 |
NG | Maximum total length with lowest set response pressure |
6 | 165 mm |
10 | 181 mm |
20 | 212 mm |
30 | 283 mm |
Sheet cut-out for valve mounting with subplate mounting design "P"
NG | B1 | B2 | H1 | H2 | ØD1 | ØD2 | R1 | ||
mm | mm | mm | mm | mm | mm | mm | |||
6 | 45 | 12.5 | 25 | 22.5 | 7 | H13 | 40 | H13 | 8 |
10 | 60 | 20.5 | 40 | 20.5 | 9 | H13 | 44 | H13 | 8 |
20 | 70 | 24 | 50 | 24 | 9 | H13 | 55 | H13 | 8 |
30 | 100 | 29.5 | 60 | 29.5 | 11 | H13 | 73 | H13 | 8 |
Information
Component marking
Type-examination tested safety valves bear a coded component marking. It always comprises the identical elements, the meaning of which is shown in the following example:
TÜV . SV . 13 - 390 . 4,5 . F . 30 . 500
Mark of the notified body which has carried out the type-examination procedure | TÜV |
Safety valve | SV |
Last digit of the year of the last extension of the validity of the component marking | 13 |
Number of the component marking assigned by VdTÜV | 390 |
Smallest flow diameter in front of the valve seat in mm | 4,5 |
Valve for hydraulic fluid | F |
Maximum flow in l/min without counter pressure in the discharge line or discharge coefficient | 30 |
Set response pressure in bar | 500 |
Important information regarding the operation according to the Pressure Equipment Directive 2014/68/EU
- Before ordering a type-examination tested safety valve, it must be observed that for the desired response pressure p, the maximum admissible flow qVmax of the safety valve must be larger than the maximum possible flow of the system/accumulator to be secured. In this respect, the applicable regulations must be observed!
- According to the Pressure Equipment Directive 2014/68/EU, the increase in the system pressure due to the flow must not exceed 10 % of the set response pressure (see component marking). The maximum admissible flow qVmax stated in the component marking must not be exceeded. Discharge lines of safety valves must end in a risk-free manner. The accumulation of fluids in the discharge system must not be possible (see data sheet AD2000 A2).
It is imperative to observe the application notes!
- In the plant, the response pressure specified in the component marking is set at a flow of 2 l/min.
- The maximum admissible flow stated in the component marking applies for applications without counter pressure in the discharge line (port T).
- By removing the lead seal at the safety valve, the approval according to the Pressure Equipment Directive becomes void!
- Basically, the requirements of the Pressure Equipment Directive and of data sheet AD2000 A2 have to be observed!
- It is recommended to secure type-examination tested safety valves against inadmissible removal from the screw-in housing/block by means of wiring and sealing with the housing/block (bore available in the adjustment element).
Notice
The system pressure increases by the counter pressure in the discharge line (port T) due to the increasing flow. Observe data sheet AD2000 A2, point 6.3!
To ensure that this increase in system pressure caused by the flow does not exceed the value of 10 % of the set response pressure, the admissible flow has to be reduced dependent on the counter pressure in the discharge line (port T) (see characteristic curves).
Further information
Use of non-electrical hydraulic components in an explosive environment (ATEX) | Data sheet | 07011 |
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 |
Safety valves, direct operated | Operating instruction | 25010-XC-B |
Selection of the filters | www.boschrexroth.com/filter | |
Information on available spare parts | www.boschrexroth.com/spc |
Ordering codes
Downloads
Explosion-protected hydraulic products for industrial and mobile applications Brochure | R999000373 | 2017-03-01 | English | PDF | 5.8MB Product Groups: Pumps, CD - single rod cylinder, Proportional, high-response and servo valves, Axial piston pumps, Mobile controls Product overview |
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