Pressure reducing valve type CLK

zero leakage in blocked state

for screwing into simple tapped holes

D 7745 L

Pressure reducing valve

type CLK

HAWE HYDRAULIK SE

STREITFELDSTR. 25 • 81673 MÜNCHEN

2.3

Further versions:

' Pressure limiting valve type CMV, CSV D 7710 MV

' Shut-off valve type CNE D 7710 NE

' Throttle and shut-off type CAV D 7711

' Check valve type CRK, CRB, CRH D 7712

' Pressure-dependent shut-off valves type CDSV D 7876

' Throttle and restrictor check valves type CQ, CQR, and CQV D 7713

' Flow control valves type CSJ D 7736

' Pressure reducing valves with tracked pressure switch type DK D 7941

Utilized at:

' Valve banks type BA D 7788

' Intermediate plates size NG6 type NZP D 7788 Z

' Valve banks type BVZP D 7785 B

Pressure p

max P

= 500 bar

max A

= 380 bar

Flow Q

max

= 22 lpm

Basic type

(cartridge valve)

Symbol

For the characteristic differences of these valves, refer to table 1 in sect. 2 as well as "Pressure dependence" in sect. 3.

A reversed flow A→P of the open valve is possible as soon as the pressure on the primary side P drops below the one on the

secondary side A. The illustration of the symbol is with a check valve on this page.

This is omitted for the sake of simplicity in the rest of the pamphlet. These valves are to be screwed into simply shaped tapped holes

of a manifold body. The sealing of the inlet to outlet takes place at the contact area between the facial sealing edge of the

screwed-in end of the valve body and the stepped shoulder of the core diameter at the location thread! Any standard steel drill (point

angle 118°) automatically forms this stepped shoulder when the cor

e diameter is drilled. Ther

efore reaming of the hole and bevels

to help the seals slip in are not necessary.

The sealing of the attached valve and its fixing at the manifold body are made by a sealing nut with a special thread seal and an

O-ring. Additionally the passage between port A and T is sealed at the screwin port and the internal piston.

1. General

The main purpose of pressure reducing valves utilized in a hydraulic

system is to maintain a rather constant pressure on the consumer side

(secondary pressure) even when the pressure at the inlet side (primary

pressure) is higher and varying.

The common pressure reducing valves (spool design) require a return

connection as there is always design related leakage. Whereas type CLK

is designed as a 2/2-way valve acting like a seated valve in idle

position. It also features a safety valve function, preventing pressure

rise and pressure peaks.

Basic type (Cartridge valves):

Type CLK 3 Standard version, usable for all applications.

Type CLK 32 Version with low pressure dependence intended for

varying pump pressure and use at low pressure

settings (Attention: Max. flow 6 lpm).

Type CLK 35 Version with low back pressure, but with higher

sensitivity to varying pump pressure.

D 7745 L page 2

) If no desired pressure specification is indicated, the valve will be set at HAWE to the max. pressure of the

respective pressure range

) The check valve function in direction A

→P is not illustrated for the sake of simplicity (see description in sect. 1)

2. Available versions, main data

Basic type (cartridge valve)

Example:

3. Further characteristic data

CLK 3 - 2 R - 180

CLK 32 - 51 -1/4 - 20

Symbols

)

Tool

adjustable

Manually adjustable

Table 1: Basic type

Pressure range p

from ... to (bar)

-1 -11 -2 -21 -5 -51

CLK 3 12 30...300 30...380 20...200 20...250 15...130 15...165

CLK 32 6 18...300 18...380 12...200 12...250 8...130 8...165

CLK 35 22 70...300 70...380 50...200 50...250 30...130 30...165

Adjustment:

No coding - Tool adjustable

R - Manually adjustable

H - Turn knob lockable

Pressure setting (bar)

)

No coding - Cartridge valve only

1/4 - with connection block,

ports G1/4 (BSPP)

with

connection block

Flow

max

(lpm)

Basic type

Nomination Directly controlled pressure reducing valve, zero leakage in idle position, with additional safety valve

function

Design 3-way directional ball seated valve

Material Steel body gas nitrided, sealing nut galv. zinc plated, internal functional parts hardened and ground,

balls made of bearing quality steel

Installation position Any

Port coding P = Inlet (pump or primary side)

A = Consumer (secondary side)

= Tank (return)

Permissible pressure Pump side p

P max

= 500 bar

Consumer side p

A max

see table 1

Retur

≤ 20 bar

Static overload capacity approx. 2 x p

max

at tightened state and with sealing nut locked

Flow Q

P→A max

= 6 lpm (CLK 32)

12 lpm (CLK 3)

22 lpm (CLK 35)

A→P max

25 lpm (see note at "Dir

ection of flow")

A→T max

see curves

Direction of flow P→A (Pressure reducing function)

A→P This only occurs if the pr

essure on the primary side is lower than on the consumer side.

Attention: A by-pass check valve is recommended if the flow A→P exaggerates the specification for

P→A max

or pressure peaks or pulsation are anticipated.

essure fluid Hydraulic oil conforming DIN 51514 part 1 to 3: ISO VG 10 to 68 conforming DIN 51519.

Viscosity limits: min. approx. 4, max. approx. 1500 mm

/s;

opt. operation approx. 10... 500 mm

/s.

Also suitable ar

e biologically degradable pressure fluids types HEPG (Polyalkylenglycol) and HEES

(Synth. Ester) at service temperatures up to approx. +70°C

Temperature Ambient: approx. -40 ... +80 °C

Fluid: -25 ... +80°C, Note the viscosity range!

Permissible temperatur

e during start: -40°C (observe start-viscosity!), as long as the service tempera

ture is at least 20K higher for the following operation.

Biologically degradable pressure fluids: Observe manufacturer's specifications. By consideration of the

compatibility with seal material not over +70 °C.

Lockable

D 7745 L page 3

|p - Q - curve

P→A or A→P

Attention:

Obey the note in "Direction of flow" (page 2)

Back pressure

|p (bar)

- Q

→

- curves

The set pressure applies to flow Q

P→A

→ 0 lpm. With flow Q > 0, i.e. the consumer is moving, the

pressure on the secondary side p

will drop slightly. This effect can be usually neglected during service.

Note: A pressure gauge should be used whenever the pressure setting is adjusted or altered!

Flow Q

(lpm)

Curves

Pressure specification The pressure setting p

will be set in the factory with p

, 1.1 p

Pressure alternations The actual pressure p

being received will vary slightly as it directly depends on the pressure at the

primary side p

due to a internal design based ratio.

Basic type Pressure range

-08 -1 -2 -5

-081 -11 -21 -51

CLK 3 1.3 bar 0.9 bar 0.6 bar 0.4 bar

CLK 32 0.7 bar 0.45 bar 0.3 bar 0.2 bar

CLK 35 2.7 bar 1.7 bar 1.2 bar 0.8 bar

Pressure change

(bar) at

* 10 bar

Further characteristic data

Mass (weight) Basic type (cartridge valve) Type CLK.. = 0.7 kg

Combination with connection block Type CLK..-1/4 = 1.3 kg

Pressure at the outlet p

(bar)

Flow Q

(lpm)

Identical pressure setting

Safety valve function

Pressure reducing function

D 7745 L page 4

4. Unit dimensions All dimensions are in mm and are subject to change without notice!

4.1 Basic type (cartridge valve)

Type CLK 3, CLK 32 and CLK 35

Valve body

a/f 24

70 Nm

Provision for lead seal

Sealing nut hole

a/f 30

60 Nm

O-ring 21.95x1.78

AU 90 Sh

O-ring 18.77x1.78

P 5001

Sealing edge

Tool adjustable

Travel

stop

KANTSEAL

DKAR00021-N90 NBR 90 Sh

23.52x26.88x1.68

Mounting hole

) If pressure at A exceeds 100 bar a counter bore is required to allow proper sealing!

) Thread counter bore max. #24

+0.2

Pressure adjustment (guideline)

Attention: Any pr

essur

e r

e-adjustment should be

monitored with a pressure gauge!

Coding |p/revolution

(bar/rev)

125

510

Assembly notes

Valve body

a/f 24

70 Nm

locking

Manifold

; Before screwing the valve body into the manifold slacken the

counter/sealing nut until the travel stop.

< Screw in the valve body (a/f 24) and tighten with the correct

torque. The metallic sealing of the inlet to the outlet takes place

at the contact ar

ea of the facial sealing edge and the stepped

shoulder of the core diameter at the location thread.

= Retighten the counter/sealing nut (a/f 30) with the corr

ect torque.

ravel stop

;

Counter/

sealing nut

a/f 30

60 Nm

Sealing edge

Coding |p/revolution

(bar/rev)

51 12

Manually adjustable

Lockable; one key is

scope of delivery

Valve body

a/f 24

70 Nm

Valve body

a/f 27

70 Nm

Reaming depth

Detail X:

D 7745 L page 5

4.2 Version with connection block for direct pipe connection

Type CLK 3..-1/4

Ports conf. ISO 228/1:

P, A, M, T = G 1/4 (BSPP)

#8.5 thru-hole

4.3 Tapped plugs

Mounting holes in the manifold may be blocked if required by tapped plugs, e.g. if uniform manufactured manifolds should be

equipped with or without cartridge valves de-pending on application.

Passage open Passage closed

apped plug

M 24x1.5 DIN 910

Tapped blockage

part No. 7745 405

O-ring 21.95x1.78 AU 90 Sh

KANTSEAL DKAR00021-N90

NBR 90 Sh 23.52x26.88x1.68

Tapped blockage/plug

combination

part No. 7745 455

a/f 30,

60 Nm

a/f 12,

70 Nm

P, A = open

T = closed

P, A, T = closed

(approx. 118)

approx. 5