HAWE Hydraulik CDK Series Operator's manual

Pressure-reducing valve type CDK
Product documentation
D 7745
09-2019-1.9
Screw-in valve
Operating pressure pmax:
Volumetric ow rate Qmax:
500 bar
22 l/min

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© by HAWE Hydraulik SE.
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HAWE Hydraulik respects these legal provisions in all cases.
Printing date / document generated on: 11.11.2019

© HAWE Hydraulik SE D 7745 - 09-2019-1.9 3/25
Contents
1 Overview pressure control valve type CDK............................................................................................................ 4
2 Available versions, main data............................................................................................................................. 5
2.1 Screw-in valve..................................................................................................................................................... 5
2.2 Versions with individual connection block for pipeline connection..............................................................................6
2.3 Versions with individual connection block for plate mounting....................................................................................7
3 Parameters......................................................................................................................................................... 8
3.1 General............................................................................................................................................................... 8
4 Dimensions...................................................................................................................................................... 12
4.1 Screw-in valve................................................................................................................................................... 12
4.2 Mounting hole................................................................................................................................................... 13
4.3 Version with single connection block for pipe connection........................................................................................14
4.4 Version with connection block for manifold mounting............................................................................................. 17
4.5 Base plate hole pattern...................................................................................................................................... 18
4.6 Tapped plugs..................................................................................................................................................... 18
5 Assembly, operation and maintenance recommendations.....................................................................................19
5.1 Intended use..................................................................................................................................................... 19
5.2 Assembly information......................................................................................................................................... 19
5.2.1 Screwing in the screw-in valve.............................................................................................................................20
5.2.2 Setting the pressure........................................................................................................................................... 20
5.2.3 Creating the mounting hole.................................................................................................................................21
5.2.4 Making base plate.............................................................................................................................................. 21
5.3 Operating instructions.........................................................................................................................................22
5.4 Maintenance information..................................................................................................................................... 22
6 Other information.............................................................................................................................................23
6.1 Planning information.......................................................................................................................................... 23
6.2 Application examples.......................................................................................................................................... 24

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1Overview pressure control valve type CDK
Pressure reducing valves are a type of pressure control valve. They
maintain a largely constant outlet pressure even at a variable
(higher) inlet pressure.
Valve type CDK is a screw-in valve, and can be used in control
blocks. The bore-holes required for mounting are easy to create. All
versions oil-tight when closed.
Features and benets:
■Zero leakage in closed state
Intended applications:
■General hydraulic systems
■Jigs
■Test benches
Design:
■Type CDK 3 - standard version, can be used for all applications.
■Type CDK 32 - version with low pressure dependence on
changing pump inlet pressure and for usage at low pressure
settings.
■Type CDK 35 - version with low ow resistance, however with
higher pressure dependence on changing pump inlet pressures.
Version with connection blocks:
■For pipe connection (without/with pressure-limiting valve)
■For manifold mounting (without/with pressure-limiting valve)
■For manifold mounting (without/with pressure-limiting valve)
with adapter plate for pipe connection
Screw-in valve
Version with connection block for direct pipe connection
Version with connection block for manifold mounting

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2Available versions, main data
2.1 Screw-in valve
Circuit symbol:
NOTE
Flow direction A d P not shown, see "Flow direction" section in Chapter 3.1, "General"
Sample order:
CDK 3 -2 R -200
Pressure setting (bar) Pressure control valve *
Adjustment Table 2 Adjustment
Basic type and pressure range Table 1 Basic type and pressure range
* If there is no specied pressure setting, the valve will be set at the factory to the maximum value in the pressure range in question
Table 1 Basic type and pressure range
Pressure range pA from ... to (bar)Type Volumetric
ow rate
Qmax (lpm) -08 -081 -1 -11 -2 -21 -5 -51
CDK 3 50 ... 450 50 ... 500 30 ... 300 30 ... 380 20 ... 200 20 ... 250 15 ... 130 15 ... 165
CDK 3K*12 55 ... 310 - 30 ... 200 - 20 ... 140 - 15 ... 90 -
CDK 32 6 30 ... 450 30 ... 500 18 ... 300 18 ... 380 12 ... 200 12 ... 250 8 ... 130 8 ... 165
CDK 32K*6 30 ... 310 - 18 ... 200 - 12 ... 140 - 8 ... 90 -
CDK 35 22 110 ... 450 110 ... 500 70 ... 300 70 ... 380 50 ... 200 50 ... 250 30 ... 130 30 ... 165
CDK 35K*22 110 ... 310 - 70 ... 200 - 50 ... 140 - 30 ... 90 -
*Short version, available "xed" only
Table 2 Adjustment
Identifier Description Circuit symbol
No designation Fixed, can be adjusted using tool
RCan be adjusted by hand, with lock nut
(not for type CDK 3.K)
HRotating grip with lock
(not for type CDK 3.K)

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2.2 Versions with individual connection block for pipeline connection
Sample order:
CDK 3 -5 R
CDK 35 -2
-1/4
-1/4 SR
- DG 365 -100
-200 /250
Pressure setting (bar) Pressure relief valve
Version with pressure switch Table 4 Version with pressure switch
Versions with individual connection block Table 3 Versions with individual connection block
Table 3 Versions with individual connection block
Identifier Description Connection Circuit symbol
-1/4 G 1/4 (BSPP)
-9/16-18 UNF 9/16-18 UNF
-1/4-18 NPTF 1/4-18 NPTF
-1/2
Pipe connection
G 1/2 (BSPP)
-1/4 - DG.. G 1/4 (BSPP)
-9/16-18 UNF - DG.. 9/16-18 UNF
-1/4-18 NPTF - DG..
Pipe connection, pressure switch in the load line
1/4-18 NPTF
-1/4 S Pipe connection, pressure-limiting valve, xed, tool adjustable G 1/4 (BSPP)
-1/4 SR Pipe connection, pressure-limiting valve, manually adjustable, with
lock nut
G 1/4 (BSPP)
NOTE
Connection M with reduced ow.
Table 4 Versions with pressure switch
Coding Setting range (bar)
- DG 33 200 ... 700
- DG 34 100 ... 400
- DG 35 40 ... 210
- DG 36 4 ... 12
- DG 364 4 ... 50
- DG 365 12 ... 170

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2.3 Versions with individual connection block for plate mounting
Sample order:
CDK 35 -5 R - SP -100/300 - 1/4
Adapter plate Table 5 Connection block version
Connection block Table 5 Connection block version
Table 5 Connection block version
Identifier Description Circuit symbol
PPlate mounting
SP Plate mounting, pressure relief valve, xed, can be adjusted using tool
P - ... - 1/4 Plate mounting
SP - ... /... - 1/4 Plate mounting, pressure relief valve, xed, can be adjusted using tool, with adapter plate
for pipeline connection

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3Parameters
3.1 General
General information
Designation Directly piloted 2-way pressure control valve
Design Ball seated valve
Model Screw-in valve, valve for pipe connection, manifold mounting valve
Material Steel; nitrided valve housing, electrogalvanised or ZiNi sealing nuts and connection block,
hardened and ground functional inner parts
Balls made of rolling bearing steel
Tightening torque See Chapter 4, "Dimensions"
Installation position As desired
Ports ■P = input (pump side or primary side)
■A = Load (secondary side)
■M = pressure gauge connection
■R = Tank connection
Markings apply to hydraulic schematics and assembly plans only. The markings are not
stamped onto the valve housing.
The ports are stamped on the versions for pipe connection and versions for manifold
mounting.
The coding can be found in the schematic overviews or the dimension diagrams in Chapter 4,
"Dimensions".
Flow direction P → A: Pressure control function
A → P: Only possible if the pressure on the pump side is lower than the load pressure.
NOTE
In the case of ow rates of A d P with more than QP d A max or if pressure surges
or pressure pulsations are to be expected, a separate bypass check valve is to be
provided.
Hydraulic uid Hydraulic oil: according to part 1 to 3;
ISO VG 10 to 68 according to DIN ISO 3448
Viscosity limits: min. approx. 4, max. approx. 1500 mm2/s
opt. operation approx. 10... 500 mm2/s.
Also suitable for biologically degradable hydraulic uids type HEPG (polyalkylene glycol)
and HEES (synthetic ester) at operating temperatures up to approx. +70°C.
Cleanliness level ISO 4406
21/18/15...19/17/13
Temperatures Ambient: approx. -40 ... +80°C, Fluid: -25 ... +80°C, Note the viscosity range!
Permissible temperature during start: -40°C (observe start-viscosity!), as long as the service
temperature is at least 20K higher for the following operation.
Biologically degradable pressure uids: Observe manufacturer's specifications. By considera-
tion of the compatibility with seal material not over +70°C.

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Pressure and ow rate
Operating pressure ■On the pump side pP max = 500 bar
■Load side pA max, see Table for basic version in Chapter 2, "Available versions, main data"
■Return pR ≤ 20 bar
Pressure dependence The pressure ratio as designed causes a slight change to the actual pressure pA in conjunction
with a variable pump pressure pP.
Pressure range (bar)Type
-08
-081
-1
-11
-2
-21
-5
-51
CDK 3 ± 1.3 ± 0.9 ± 0.6 ±0.4
CDK 32 ± 0.7 ± 0.45 ± 0.3 ± 0.23
CDK 35 ± 2.7 ± 1.7 ± 1.2 ± 0.8
pp ± 10 bar results in a pressure change for A of pA
Flow rate QP→A max = 6 lpm (CDK 32)
= 12 lpm (CDK 3)
= 22 lpm (CDK 35)
QA→P max = 25 lpm See note in Chapter 3, "Parameters"

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Characteristics
Oil viscosity approx. 60 mm2/s
pA - QP→A - characteristics
The pressure setting applies for QP→A→0 lpm. If Q > 0, i.e. the connected consumer is
moving, the secondary pressure pA drops slightly.
The pressure pA is set according to the information in the order at pP ≈ 1.1 pA.
CAUTION
Risk of injury on overloading components due to incorrect pressure settings!
Risk of minor injury.
■Pay attention to the maximum operating pressure of the pump and the valves.
■Always monitor the pressure gauge when setting and changing the pressure.
QA ow rate (lpm); pA outlet pressure (bar)
Δp - Q - Characteristic curve P→A or A→P
QA Volumetric ow rate (lpm); Δp Flow resistance (bar)
NOTE
For this purpose, please observe the additional information under the point "Flow
direction".

© HAWE Hydraulik SE D 7745 - 09-2019-1.9 11/25
Weight
Screw-in valve Type
CDK.. = 0.7 kg
Version with single connection block Identifier
- 1/4 = 1.3 kg
- 9/16-18 UNF = 1.3 kg
- 1/4-18 NPTF = 1.3 kg
- 1/4 - DG.. = 1.6 kg
- 1/4 S(SR) = 1.6 kg
- P = 1.1 kg
- SP = 1.6 kg
- P-../..-1/4 = 1.5 kg
- SP-../..-1/4 = 2.0 kg

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4Dimensions
All dimensions in mm, subject to change.
4.1 Screw-in valve
CDK 3..
1Sealing option
2Stop
3KANTSEAL DKAR00021-N90 NBR 90 Sh 23.52x26.88x1.68
4Seal edge
5Sealing nut
6O-ring 21.95x1.78 (21.89x2.62) AU 90 S
7Valve housing
CDK 3.K
1Stopper
2KANTSEAL DKAR00021-N90 NBR 90 Sh 23.52x26.88x1.68
3Sealing edge
4Sealing nut
5O-ring 21.95x1.78 (21.89x2.62) AU 90 S
6Valve housing
7Adjusting screw
NOTE
For this purpose, please also observe the information on threads and on producing requirements in Chapter 5.2, "Assembly
information"!
Type CDK 3.K: Do not turn set screw 8 beyond the red marker ring!
Adjustment
No designation Coding RCoding H

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4.2 Mounting hole
Location for sealing (inlet to outlet): at the contact area between the facial sealing edge of the tapped journal of the valve housing and
the stepped shoulder of the tapping hole of the location thread.
The stepped shoulder is depicted with the normal 118° drill tip angle for steel.
Therefore reaming of the hole and bevels to help the seals slip in are not necessary.
The sealing of the attached valve and its xing at the manifold body are made by a sealing nut with a tting seal and an O-ring.
Additionally the passage between port A and T is sealed at the screwin port and the internal piston.
Counterbore 0.5+0.2 (max. #30+0.1), exclusively required for pressures at A in excess of 100 bar.

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4.3 Version with single connection block for pipe connection
CDK 3..- 1/4
CDK 3..- 1/4 - DG..
Coding Connections P, A, M
- 1/4
- 1/4 - DG.. G 1/4 (BSPP) ISO 228-1
CDK 3..- 9/16-18 UNF
CDK 3..- 9/16-18 UNF - DG..
Coding Connections P, A, M
- 9/16-18 UNF
- 9/16-18 UNF-DG.. 9/16-18 UNF ANSI B1.1, SAE-6
1Screw-in valve, as per Chapter 4.1, "Screw-in valve"
2Pressure switch DG 3.. as per D 5440
3Without DG 3.. (can be retrofitted here)

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CDK 3..- 1/4-18 NPTF
CDK 3..- 1/4-18 NPTF - DG..
Coding Connections P, A, M
- 1/4-18 NPTF
- 1/4-18 NPTF-DG.. 1/4-18 NPTF ANSI B1.20.3
1Screw-in valve, as per Chapter 4.1, "Screw-in valve"
2Pressure switch DG 3.. as per D 5440
3Without DG 3.. (can be retrofitted here)
CDK 3..- 1/2
Coding Connections P, A
- 1/2 G 1/2 (BSPP) ISO 228-1
1Screw-in valve, as per Chapter 4.1, "Screw-in valve"

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CDK 3..- 1/4 S
CDK 3..- 1/4 SR
1Fixed
2Adjustable
Coding Connections P, A, R
- 1/4 S
- 1/4 SR G 1/4 (BSPP) ISO 228-1

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4.4 Version with connection block for manifold mounting
CDK 3 - .. - P CDK 3 - .. - SP
1Sealing with O-rings 7.65x1.78 NBR 90 Sh
For this purpose, please observe the hole pattern in Chapter 4.5, "Base plate hole pattern".
CDK 3(32, 35) - .. - P - .. - 1/4 CDK 3(32, 35) - .. - SP - .. - 1/4
1Adapter plate (connection block for pipe connection)
2Sealing with O-rings 7.65x1.78 NBR 90 Sh
Identifier Connections P, A, R
- P ..
- SP .. G 1/4 (BSPP) ISO 228-1

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4.5 Base plate hole pattern
The hole pattern corresponds to that of type ADM 11 P as per D 7120. The O-ring
counterbore for the drain port R (or L) is present but is only required for type
CDK..-SP.
4.6 Tapped plugs
The mounting holes can be sealed with tapped plugs if necessary; for example, if the assembly of standardised basic bodies is to be
carried out with or without screw-in valves as required.
Passage open
1Tapped plug M24x1.5 DIN 910
2Sealing ring A25x30x2 DIN 7603-Cu
Passage closed
1O-ring 21.95x1.78 AU 90 Sh
2KANTSEAL DKAR00021-N90 NBR 90 Sh 23.52 x 26.88 x 1.68
3Tapped plug and locking tapped plug complete order no.. 7710 029

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5Assembly, operation and maintenance recommendations
5.1 Intended use
This valveis intended exclusively for hydraulic applications (uid technology).
The user must observe the safety measures and warnings in this documentation.
Essential requirements for the product to function correctly and safely:
– All information in this documentation must be observed. This applies in particular to all safety measures and warnings.
– The product must only be assembled and put into operation by qualied personnel.
– The product must only be operated within the specied technical parameters. The technical parameters are described in detail in this
documentation.
– All components must be suitable for the operating conditions in the event of application in an assembly.
– The operating and maintenance manual of the components, assemblies and the specic complete system must also always be
observed.
If the product can no longer be operated safely:
1. Remove the product from operation and mark it accordingly.
✓It is then not permitted to continue using or operating the product.
5.2 Assembly information
The product must only be installed in the complete system with standard and compliant connection components (screw ttings, hoses,
pipes, xtures etc.).
The product must be shut down correctly prior to dismounting (in particular in combination with hydraulic accumulators).
DANGER
Risk to life caused by sudden movement of the hydraulic drives when dismantled incorrectly!
Risk of serious injury or death.
■Depressurise the hydraulic system.
■Perform safety measures in preparation for maintenance.

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5.2.1 Screwing in the screw-in valve
1Valve housing *
2Lock nut and sealing nut *
3Basic body
4Sealing edge
5Locking
6Stopper
7Sealing option
1. Before screwing in the valve, loosen the lock nut and sealing nut until the travel stop.
2. Screw in the valve and tighten with the specied torque. The metallic sealing of the
inlet to the outlet is formed between the facial sealing edge of the valve and the
shoulder of the stepped hole in the basic body.
3. Tighten lock nut and sealing nut with specied torque.
* Values in brackets apply to pressure ranges of type CDK 3.-08 (-81)
5.2.2 Setting the pressure
If there is no specied pressure setting, the valve will be set at the factory to the maximum value in the pressure range in question.
Guideline values for pressure adjustment
Pressure adjustment
Pressure control valve
Identifier Δp/revolution
(bar/R)
08 37
1 25
2 16
5 10
Pressure adjustment
Pressure control valve
Identifier Δp/revolution
(bar/R)
081 46
11 31
21 20
51 12
Pressure adjustment
Pressure relief valve
Pressure range
(bar)
Δp/revolution
(bar/R)
... 500 100
... 315 55
... 160 19
... 80 9.5
CAUTION
Risk of injury on overloading components due to incorrect pressure settings!
Risk of minor injury.
■Pay attention to the maximum operating pressure of the pump and the valves.
■Always monitor the pressure gauge when setting and changing the pressure.