9
BC332376486121en-000204
Table of Contents Quick Reference Index
Pilot Pistons
EXAMPLE
Application of pilot pistons
OPERATION
Pilot pistons used with check valve cartridges are an economical way to create pilot-operated check valve functions in
custom Hydraulic Integrated Circuits (HIC).
Accessories
Pilot
piston
Check valve
W
W
W
Lifting
Load holding
Lowering
10
BC332376486121en-000204
Table of Contents Quick Reference Index
Pilot Pistons
Accessories
SINGLEACTING PILOT PISTONS
Series Compatible
valves
Pilot
ratio
Seals (optional) Pilot piston
order code
A
mm [in]
B
mm [in]
Bore diameter*
mm [in]
8 CV08-NP 4:1 1) 720092 O-rings
2) 720500 back-up rings
621460 26.97
[1.062]
14.27
[0.562]
Ø 12.70 ± 0.03
[0.501 ± 0.001]
A
B
10 CV10-NP 4:1 1) 720178 O-ring
2) 720412 back-up rings
621175 44.45
[1.750]
25.40
[1.000]
Ø 15.90 ± 0.03
[0.626 ± 0.001]
A
B
621176 47.63
[1.875]
28.58
[1.125]
621535 38.10
[1.500]
19.05
[0.750]
*Consult factory for bore details.
DOUBLEACTING PILOT PISTONS
Series Compatible
valves
Pilot
ratio
Seals (optional) Pilot piston
order code
A
mm [in]
B
mm [in]
Bore diameter*
mm [in]
8 CV08-NP 4:1 1) 720092 O-rings
2) 720500 back-up rings
621457 41.28
[1.625]
14.27
[0.562]
Ø 12.70 ± 0.03
[0.501 ± 0.001]
A
B B
621553 52.37
[2.062]
19.84
[0.781]
625138 38.10
[1.500]
12.70
[0.500]
625298 49.53
[1.950]
18.42
[0.725]
10 CV10-NP 4:1 1) 720178 O-ring
2) 720412 back-up rings
621058 60.50
[2.382]
20.73
[0.816]
Ø 15.90 ± 0.03
[0.626 ± 0.001]
A
B B
621400 57.15
[2.250]
19.05
[0.750]
621692 69.85
[2.750]
25.40
[1.000]
625104 66.04
[2.600]
23.50
[0.925]
*Consult factory for bore details.
11
BC332376486121en-000204
Table of Contents Quick Reference Index
Pilot Pistons
Accessories
Nominal
cartridge size
Single
or double acting
With or
without stops
A B C
Required
housing bore
8
Single
Double
Without
Without
15,1 (0.60)
15,1 (0.60)
34,1(1.34)
53,2 (2.10)
8,3 (0.33)
8,3 (0.33)
12,73 (0.500)
12,75 (0.502)
10
Single
Double
Single
Double
Without
Without
With
With
19,1 (0.75)
19,1 (0.75)
19,1 (0.75)
19,1 (0.75)
41,3 (1.63)
57,2 (2.25)
45,7 (1.80)
54,8 (2.16)
13,5 (0.53)
10,3 (0.41)
6,7 (0 26)
6,7 (0 26)
15,88 (0.625)
15,88 (0.625)
15,90 (0.626)
15,90 (0.626)
12
Single
Double
Without
Without
17,5 (0.69)
17,5 (0.69)
44,5 (1.75)
71,4 (2.81)
14,3 (0.56)
14,3 (0.56)
23,80 (0.937)
23,85 (0.939)
16
Single
Double
Without
Without
31,8 (1.25)
31,8 (1.25)
63,5 (2.50)
95.3 (3.75)
12,7 (0.50)
12,7 (0.50)
28,58 (1.125)
28,60 (1.126)
20
Single
Double
Without
Without
38,1 (1.50)
38,1 (1.50)
77,8 (3.06)
117,5 (4.63)
19,0 (0.75)
19,0 (0.75)
36,50 (1.437)
36,53 (1.438)
Note: Use with cartridges to form pilot operated check and similar functions in HIC and standard valve packages.
Warning: The use of pilot pistons with check valve assemblies may increase the load applied to the valve poppet which may result is reduced fatigue life of the cartridge
Nominal
cartridge size
Single or double
acting
With or without
stops
Piston with
buna-N seals
Piston with
viton
®
seal
Piston without
seals
8
Single
Double
Without
Without
02-178662
02-178669
02-178663
02-178670
02-178653
02-178654
10
Single
Double
Single
Double
Without
Without
With
With
02-166275
566419
566421
566423
566418
566420
566422
566424
566417
02-166313
566337
566338
12
Single
Double
Without
Without
02-185700
02-185703
02-185701
02-185704
02-185699
02-185702
16
Single
Double
Without
Without
566425
566428
566426
566429
889052
566427
20
Single
Double
Without
Without
566431
566434
566432
566435
566430
566433
Note: ψ Sealed models have a central O-ring with a back-up ring on both sides.
WARNING: Seals should not be used with check valves that have < 50 psi crack pressure
Forms
A
B
C
Single-acting, without stop
ψ
A
B
C
C
Double-acting, without stops
ψ
B
A
C
Single-acting, with stop
ψ
A
B
C C
Double-acting, with stops
ψ