File: TKE$002_E 01/2000/eV • 2

ARON cartridge valves are basically

composed of a cover and an operat-

ing unit insert in the ISO 7368 (DIN

24342) mounting frame. Each car-

tridge valve is characterized by 2 main

way for the nominal flow (up to 350 l/

min).

By combining the various covers, op-

erating units and connections within the block, many different functions can be obtained like:

direct control, non-return, hydraulically piloted non-return, pressure control, flow rate regula-

tion, as well as a combination of these same functions.

Thanks to their design features and operational flexibility, cartridge valves can be used to:

• speed-up machine cycles, and therefore increase productivity and efficiency (better

response time compared to traditional valves);

• ensure minimum thermal dissipation (tanks to the passageway dimensions);

• reduce the hydraulic plant weight (tanks to the compact functions block);

• reduce to a minimum any internal leakages;

• provide ease of installation and serving.

The logic units 2/2 (Fig. 1) are formed by a cover (1), a functional unit (2), a spacer (3), a closure

spring (4) and a guide bush (5) for each functional unit. Covers can be changed according to

the required application and the functional unit can be combined with different springs in order

to obtain various opening pressure.

Covers

Covers serve to enclose the functional unit and to house the piloting ports and any

incorporated valves or manual adjustment devices. Inside the cover are housed also the seats

for the calibrated orifice used to optimize the valve opening/closed response time in according

to the type of hydraulic system being implemented.

CETOP 3 interface covers are available, ready to accept solenoid valves or other modular

valves for the implementation of particular control functions.

The maximum allowed pressure is a function of the flow rate (max.400 bar).

2/2 CARTRIDGE VALVES LOGIC ELEMENTS

ACCORDING TO

ISO 7368 (DIN 24342)

Nominal size (max. diameter) 16mm / 25mm

Max. opening pressure 350 bar

Max. nominal flow rate NG16 150 l/min

Max. nominal flow rate NG25 350 l/min

Fluid temperature -20°C ÷ 75°C

Max. contamination level class 10 in accordance

with NAS 1638 with filter ß

≥75

FIG. 1 - AREA RATIO

1 = COVER

2 = FUNCTIONAL UNIT

3 = SPACER

4 = CLOSURE SPRING

5 = GUIDE BUSH FOR

FUNCTIONAL UNIT

The logic unit operates as a function of the pressures acting on the relevant areas, and different

opening pressures are obtained, depending on the dimensions of these areas.

A description of how to interpret the ARON cartridge opening ratios is as follows:

- there are three relevant areas A1, A2, A3;

- area A1 is taken to represent 100%, i.e. it is the reference area;

- area A2, when a 2:1 ratio is shown, is equal to 50% of area A1 and all the other ratios shown

in the Table 2 can be calculated on this basis.

As consequence of these area ratios the are different opening pressures whether proceeding

from A → B or from B → A.

A M

AIN FLOW

B MAIN FLOW

X EXTERNAL PILOTING

Z1 EXTERNAL PILOTING

Z2 EXTERNAL PILOTING

Y DRAINAGE

A1 A PORT EFFECTIVE CROSS SECTION

A2 B PORT EFFECTIVE CROSS SECTION

A3 SPRING CHAMBER EFFECTIVE CROSS SECTION

ORIFICE FUNCTIONAL SYMBOLS

STANDARD ORIFICE

(ALREADY INSERTED)

Ø 1mm (DIAMETER)

A GRUB SCREW ORIFICE CAN BE

INSERTED IN THE THREADED SEAT

BLIND

2/2 LOGIC ELEMENTS AND COVERS

KEL.16/25... CH. V PAGE 3

KEC.16/25... CH. V PAGE 3/6/7/8

HYDRAULIC MOUNTING SCHEMES CH. V PAGE 4

NG16/NG25 SEATS CH. V PAGE 5

KEC.16/25... WITH CMP CH. V PAGE 9/10

C.*.P.16/25... CH. V PAGE 9/11

KRA.16/25... CH. V PAGE 12

KRA.16/25... + AD.3.V... CH. V PAGE 14

PROXIMITY FOR KRA CH. V PAGE 15

File: TKE$002_E 01/2000/eV • 3

00/2001/dI • 3

TAB. 1 - SYMBOL, FUNCTION, AREA RATIO AND OPENING PRESSURE

ORDERING CODE

KEL Logic element 2/2

** 16 = NG16

25 = NG25

* Function: see table 1

Areas ratio:

U = 1 : 1

S = 12.5 : 1

B = 2 : 1

(for version with drilled

poppet see CF variant)

F = 2 : 1

R = 2 : 1

* Opening pressure (bar)

(Tab.1 pressure values)

(Tab.2 spring's colour and code)

** Calibrated orifices:

00 = blind

08 = 0.8 mm

09 = 0.9 mm

10 = 1.0 mm

12 = 1.2 mm

14 = 1.4 mm

** 00 = No variant

V1 = Viton

CF = With drilled poppet

only for KEL.**.B...

2 Serial No.

COVERS ORDERING CODE

KEC Covers for

logic element 2/2

** 16 = NG16

25 = NG25

** Type of cover (see Tab. 3)

RI = Directional with external piloting

CQ = Directional with stroke adjustment

RC = Directional with interface NG6

PC = With hydraulic outlet pilot valve

SH = With built-in-exchange (shuttle)

SP = With built-in-exchange and interface NG6

** 00 = No variant

V1 = Viton

2 Serial No.

2/2 LOGIC ELEMENTS

TAB. 3 - COVERS HYDRAULIC SYMBOLS

Type Symbol

KEC.**.RI.**.2

Directional with

external piloting

KEC.**.CQ.**.2

Directional with

stroke adjustment

KEC.**.RC.**.2

Directional with

interface NG6

KEC.**.PC.**.2

With hydraulic outlet

pilot valve

KEC.**.SH.**.2

With built-in-exchange

valve (shuttle)

KEC.**.SP.**.2

With built-in-exchange

valve (shuttle) and

interface NG6

TAB. 2 - SPRING'S COLOUR AND CODE

Spring

U S B-F R

type NG16 NG25 NG16 NG25 NG16 NG25 NG16 NG25

Cod. L without colour red without colour red without colour red without colour red

Cod. M green yellow red green red green red green

Cod. H blue blue yellow yellow green yellow green yellow

Cod. J

without colour blue

Function Symbol Area Code Opening pressure

ratio (bar)

A →B B →A

Directional (U) A1 : A3 KEL.*.U.L.00... L = 0.3

(normally used 1 : 1 KEL.*.U.M.00... M = 1.6

for relief valve) KEL.*.U.H.00... H = 4

KEL.*.U.J.00... J = 9

Directional (U) A1 : A3 KEL.*.U.L.**... L = 0.3

with orifice 1 : 1 KEL.*.U.M.**... M = 1.6

KEL.*.U.H.**... H = 4

Directional (S) A1 : A2 KEL.*.S.L.00... L = 0.3 L = 4

12.5 : 1 KEL.*.S.M.00... M = 0.6 M = 8

KEL.*.S.H.00... H = 1.5 H = 20

Directional (S) A1 : A2 KEL.*.S.L.**... L = 0.3 L = 4

with orifice 12.5 : 1 KEL.*.S.M.**... M = 0.6 M = 8

KEL.*.S.H.**... H = 1.5 H= 20

Directional (B) A1 : A2 KEL.*.B.L.00... L = 0.5 L = 1

(normally used 2 : 1 KEL.*.B.M.00... M = 1 M = 2

for check valve) KEL.*.B.H.00... H = 2.5 H = 5

Flow (F) A1 : A2 KEL.*.F.L.**... L = 0.5 L = 1

control 2 : 1 KEL.*.F.M.**... M = 1 M = 2

KEL.*.F.H.**... H = 2.5 H = 5

A → B

With NG16 NG25

sensitized (R) A1 : A2 KEL.*.R.L.00... L = 0.7 L = 0.6

cover 2 : 1 KEL.*.R.M.00... M = 1.5 M = 1.5

KEL.*.R.H.00... H = 4 H = 3.5

KEL.*.R.J.00... J = 9

COVERS FOR LOGIC ELEMENTS