Right Bottom Frame in p06631

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.

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
Flow from port	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

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

Updated on May 11, 2010 05:16 pm .

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