HAWE Hydraulik CDK Series Manual del operador

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

2/25 D 7745 - 09-2019-1.9 © HAWE Hydraulik SE

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Printing date / document generated on: 11.11.2019

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

4/25 D 7745 - 09-2019-1.9 © HAWE Hydraulik SE

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)

with adapter plate for pipe connection

Screw-in valve

Version with connection block for direct pipe connection

Version with connection block for manifold mounting

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)

6/25 D 7745 - 09-2019-1.9 © HAWE Hydraulik SE

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

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

8/25 D 7745 - 09-2019-1.9 © HAWE Hydraulik SE

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.

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"

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".

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