Description
Designed for single acting cylinders which are supposed to hold pressure. Ensure smooth decompression prior to return of the cylinder ram. Large return oil passages to reduce pressure drops allowing rams to return under low external forces. Valves with quick exhaust feature have 2.34 times larger return passages. They are meant for rams having either very low reactive forces or must return rapidly under normal forces. Valves can be connected in series for independent multiple single acting cylinder operations. Solenoid optd. pressure holding D.C.V.
Section

Unit Dimensions

Valve type

Model

H1

H2

L1

L2

Port Details

A

B

C

G

P

T

Standard

4DES 20 A

59

121

126

264

G1

G1 1/4

G3/8

G1/4

G1

G1 1/2

With quick exhaust feature

4DES 20 B

72

134

131

276

G1 1/2

Note : Valve with 'Mirror Image' face option will have ports A, C, T and G on opposite face and dimension 26 (marked *) of port P will be 74.

 

Technical Specifications
Construction ...................................... Spool and poppet type.
Mounting type ................................... Threaded body.
Mounting position .............................. Optional, horizontal spool axis preferred.
Direction of flow ................................ Refer hydraulic symbol.
Flow passage areas .......................... (Nominal)

Valve

Model

P to A
P to B
cm. sq.

B to T
cm. sq.

 

Standard

4DES 20 A

3.1

5.3

 

With quick exhaust feature

4DES 20 B

3.1

12.4

Operating Pressure ........................... For ports P, A, B, C, G ........ 350 bar
For ports T ......... 7 bar max.
Pilot pressure ................................... 35 bar.
Hydraulic medium ............................. Mineral oil.
Viscosity range ................................. 10cSt to 380 cSt.
Working temperature range .............. -20 C to +70 C.
Fluid cleanliness requirement ........ As per ISO code 16/13 or better.
Nominal flow handling capacity ........ Refer performance curve.
Mass .................................…........... 4 DES 20 A ............... 23.5 kg.
4 DES 20 B ............... 25.2 kg.
Solenoid valve ............ 2.3 kg.

Flow from port

For valve

4DES 20A

4DES 20B

P to A

2

2

P to B

1

1

B to T

3

4

 

Hydraulic Circuit showing typical application of valves 4DES20*.*

Ordering Informations

 

4 Service ports 4
D.C.V. solenoid optd. with pr. holding facility at it's port B DES
Size 20
Valve type
Spool holding spring centred S
Face option for ports A,C,T and G only
Design Code 14

Product Code

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Subject to revision.

Regd. office & Works :
78-80, Machhe Industrial Estate, Machhe, Belgaum - 590 014. Karnataka, INDIA. 
Phone :
+91-0831-2411001.  Fax : +91-0831-2411002 ,  
E-mail :
 
polyhydron@vsnl.com ,  Website :  www.polyhydron.com

 

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Polyhydron Pvt. Ltd, Belgaum, India.

Updated on May 11, 2010 05:16 pm .