The Covers CVC*U are designed to hold Polyhydron make 2 port slip-in cartridge
valves model CV*** in the cavities machined as per ISO 7368, and are meant to create
a pilot operated relief cum Unloading function when combined with a slip-in cartridge
having a poppet area ratio of 1:1. Here the unloading is achieved by an external
pressure , applied to its Z1 port.
Hence , as long as the pressure at port Z1 is equal to or above the set pressure on
the relief valve in the cover, the valve unloads the pump . In case the pressure at Z1
is less than the set pressure, then the combination responds to the pressure at port A
of the slip-in cartridge, limiting it at the set pressure by relieving action.
In addition, these covers are also available with an optional facility to mount Solenoid
operated Directional Control Valve to give the combination an added feature of
unloading the pump by means of an electrical signal to the Solenoid.
A Polyhydron Group Company
Description
Section
Hydraulic symbol
RELIEF CUM UNLOADING COVER
Model : CVC*U
Ref. No. D 03419
Release 02 / 2015
ENGINEERING - 1 of 2
78-80, Machhe Industrial Estate,
Machhe, Belgaum - 590 014. INDIA.
Phone : +91-(0)831- 2411001
Fax : +91-(0)831- 2411002
E-mail : polyhydron@gmail.com
Website : www.polyhydron.com
CVC*U***
CVC*U**A
With solenoid
(Normally closed)
Mounting interface : As per ISO 7368
Working pressure : 350 bar.
Hydraulic medium : Mineral oil.
Temperature range : -20°C to + 80°C.
Viscosity range : 10 cSt to 380 cSt.
Fluid cleanliness required : ISO 4406 20/18/15 or better.
Technical specifications
A
B
Y
X Z1 C
X
C
Z1X
A
B
Y
P T
BA
X
XX
Z1
Z1
CVC*U**B
With solenoid
(Normally opened)
C
Z1X
A
B
Y
P T
B
A
X
XX
Z1
X
A
B
C
Y
Z1
Z1
A/B
T
A Polyhydron Group Company
D 03419- CVC*U
ENGINEERING - 2 of 2
Unit dimensions
Dimensions in mm.
All rights reserved.
Subject to revision
Notes:
1. Cover fixing S.H.C Screws are OUT OF
SCOPE OF SUPPLY.
2. Mounting interface for Soln. D.C.V as per ISO 4401-03-02.
Cartridge Valve Cover
CVC
16 U A
15
Ordering code
Size 16, 25, 32 and 40.
For Relief cum unloading function
installation dimensions remain
Design code subjected to Change .
same for design code 10 thru 19.
S
Set screw
Hand knob
S
H
Pressure rating in bar
25,50,100,200,315 and 400.
100
A
B
Omit, if not required.
a
A B
P
T
Note : Solenoid (refer spool type) to be ordered seperately.
Spool type 'D'.
ØD2
1
1
Size
L2 L3 ØD1
67
85
102
125
33.5
42.5
51
62.5
0.8
0.8
1.2
1.2
L4
23
29
35
42.5
L5
91.5
82.5
67.5
67.5
H1
H1*
H4
53
52
50
60
53
52
58
60
30
30
30
35
Mass
Kg.
apprx
1.2
1.2
*M. 4 nos. Cover fixing
S.H.C. Screw
(Class 12.9)
M8 x 40 Long
M12 x 45 Long
M16 x 55 Long
M20 x 70 Long
Tightening
Torque.
39 Nm
135 Nm
330 Nm
650 Nm
H5ØD3
4
12
18
24
30
6
25
33
L7
41
50 6
6
2.5
4.0
5.0
8.0
L6
10.5
16
17
23
16
25
32
40
25.5
40
37.5
61
Y
C
X
X
C
Y
Z1
Soln. unloading valve
normally closed.
Soln. unloading valve
normally opened.
5
H2
H5 H1 / H1*
H4
H3 ~
ØD2ØD1
6 A/F
*M, Cover fixing S.H.C Screw
L4 40.5
L1
4
L2
32.5
L3
L1
L3
31
X
C
Y
L6 L6
L5 L5
L5
L6
L5 L5
ØD3 drill
8 deep min.
Z1
L7
ØD4
@ X, Y & Z1.
ØD5 tap
T deep.
4
6
10
8
ØD5
M8
M12
M20
M16
T
14
20
33
26
ØD4
max
Cover mounting interface as per ISO 7368.
L1
B
A
T
A/B
T
H2
30
30
30
35
H3
158
157
163
165
Please consider height H1* for covers having mounting provision for solenoid directional control valve.
