Pilot operated Check valves model CL allow free flow in the direction from Port A to
Port B and offer leakage free closure in opposite direction.
Reverse flow can be achieved by applying pilot pressure to their Port X.
These valves are meant for applications where the reverse flow (from Port B to Port A)
encounters resistance downstream of the Port A.
The intensity of pilot pressure required to keep the valve open during reverse flow depends
upon the valve model, pressure at Port A and pressure existing at the Port B when the
reverse flow starts. Pilot pressure can be calculated using formulae given below.
In most cases, smooth decompression and opening of the valve for flow from Port B to
Port A can be effectively achieved by controlling pressure and flow to the Pilot Port X.
However, in certain cases it is necessary to decompress the oil in the cylinder first before
admitting the oil in the cylinder for the return stroke for smooth reversal.
A Polyhydron Group Company
Description
Hydraulic symbol
PILOT OPERATED CHECK VALVE
Model : CL
Ref. No. D 06060
Release: 04 / 2022
ENGINEERING - 1 of 3
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
Construction : Seat type valve, with decompression facility externally drain.
Mounting style : Threaded port or subplate mounting.
Mounting interface : Sub-plate mounting - As per ISO 5781.
Threaded port body - Factory standard.
Mounting position : Optional.
Flow direction : Free flow from A to B.
: Piloted flow from B to A.
Cracking pressure : 1 bar.
Working pressure : 315 bar for Ports A, B and X.
Area ratios : Pilot piston : Decomp. poppet 16 : 1
Pilot piston : Main poppet 2 : 1
Pilot piston : Pusher pin 7.1 : 1
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.
Max. flow handling capacity : Size : 10 20 30
l/min : 80 160 350
Mass approx. : Size : 10 20 30
in Kg : 3.1 5.5 10.5
Formulae for Pilot pressure required to open the valve for flow from Port B to Port A
To open decompression spool >PA/12.5 + PB/16 + 0.5 Where,
To open the main poppet >PB/2 - PA/3 + 0.5 PA = Pressure at Port A.
PB = Pressure at Port B when the flow occurs.
Technical specifications
Section
B
X
A
***
***
Y
A BX Y
A Polyhydron Group Company
D 06060-CL
ENGINEERING - 2 of 3
Dimensions in mm.
All rights reserved.
Subject to revision
Unit dimensions
---
---
21.4
39.7
31.8
44.5
35.7
49.2
42.9
60.3
9.2
10.3
33.3
39.7
ØD1
@ A & B.
Ø4.8
@ X &Y
M10x1.5
17 deep.
L6
L7
L8
L11
L10
L12
L2
B2
B4
B5
B6
A
B
X
42.5
50
Ø7.5, 8 deep.
42.1
59.6 62.7
67.5 84.1 11.6 48.4
60
13
22
31
ØD1
max
Note: Valve fixing S.H.C Screws are not in scope of supply.
Subplate mounting interface as per ISO 5781.
***
Threaded port body
Sub-plate mounting body
L5
B1
Size
L2 L3
123
149
196
34
40
52
L4 L5
71
88
115
L7L6
10
20
30
L8
18
20
29
L1
18.5
20
52
64
15.5 89
L9 L10
84
103
135
46
58
70
84
103
135
9.3
10.5
11.5
B1
H1
50
58
80
ØD1 ØD2
30
44
60
G1/2
G1
G1 1/2
29
30.5
36
B2
66.5
74
97
Size
L2 L3
123
149
196
L4 L5
71
88
115
L7L6
10
20
30
L8
18
20
29
L1
7.1
11.1
16.7
L9 L10
21.4
20.8
24.6
34
40
52
L11
H1
50
58
80
Valve fixing
S.H.C Screws
Class 12.9
M10 x 65L
4 nos
M10 x 70L
4 nos
M10 x 90L
6 nos
9.5
10.5
15.5
L12 B1 B2 B6 B7
Tightening
Torque
Nm
77
A
B
B
A
X
L4L2
L3
L1
B7
B6
H1
6
Ø6.3
Y
Y
L9
B3
H2
H1
H2
B2B1
B3
Ø10.5 thru
B
X
A
Y
B
X
A
Y
L8
L7
L2
L3
L1
L5
ØD2G1/4
ØD1
ØD2
G1/4
22
L6
L10
L9
L4
85
95
120
B3
H2
25
29
40
7.9
6.4
4.0
B3 B4 B5
58.7
73
92.9
66.7
79.4
96.8
85
100
120
A Polyhydron Group Company
All rights reserved.
Subject to revision
D 06060-CL
ENGINEERING - 3 of 3
***
Ordering code
installation dimensions remain
Design code subjected to Change .
same for design code 01 thru 19.
Subplate mounting body
Pilot operated check valve
External drain
Port size
Threaded
body
Subplate
mounting
Size
G1/2 Ø 13 max
G1
G1 1/2
Ø 22 max
Ø 31 max
S
T
Threaded port body
CL 10 T 13
10
20
30
All rights reserved.
Subject to change without prior notice.
Due to continuous improvement in the design of the product, the actual product supplied may look different than shown above.
For critical applications, please ask for certified installation drawing.
Performance curve