EATON Vickers Screw-in Cartridge Valves V-VLOV-MC001-E1 June 2003
G-38
Description
The POC1-12 is a pilot-to-
open, screw-in cartridge
type check valve.
POC1-12
Pilot operated check valve
Operation
The POC1-12 will positively
lock a load from port 1 to
port 2, but will release the
load by applying pressure
to the pilot port (port 3).
The load can also be
released by adjusting the
optional override.
RATINGS AND SPECIFICATIONS
Performance data is typical with fluid at 21,8 cSt (105 SUS) and 49˚C (120˚F)
Typical application pressure (all ports) 350 bar (5000 psi)
Cartridge fatigue pressure (infinite life) 310 bar (4500 psi)
Rated flow 114 L/min (30 USgpm)
Pilot ratio 3:1
Internal leakage, Port 1 to 2 5 drops / min. maximum
@ 350 bar (5000 psi)
Free flow cracking pressure @ 1.0 L/min (0.25 USgpm) 0,3 bar (5 psi);
2,0 bar (30 psi); 5,1 bar (75 psi); 6,9 bar (100 psi)
Hysteresis less than 3 bar (45 psi)
Temperature range –40˚ to 120˚C (–40˚ to 248˚F)
Cavity C–12–3S
Fluids All general purpose hydraulic fluids such as:
MIL–H–5606, SAE 10, SAE 20, etc.
Filtration Cleanliness code 18/16/13
Standard housing materials Aluminum or steel
Weight cartridge w/out override 0,26 kg (0.58 lb)
cartridge w/override 0,34 kg (0.74 lb)
Seal kit 02-180095 Buna-N
02-165887 Viton
®
Viton is a registered trademark of E.I.DuPont
23
1
F Type
S Type
2 3
1
1
2
3
Flow - L/min (21,8 cSt oil @ 49ºC)
Flow - USgpm (105 SUS oil @ 120°F)
Pressure Drop - psi
Pressure Drop - bar
20 40 60
100
200
300
0
0
7
80 100
28
14
510152025300
21
400
A
B
C
D
E
3:1 Ratio
Crack Pressure + Port 1 Pressure - Port 2 Pressure
3
+ Port 2 pressurePilot pressure, nominal at Port 3 =
Functional Symbols
Sectional View
Pressure Drop Curves
Cartridge only
A – 100 psi
B – 75 psi
C – 30 psi
D – 5 psi
E – Full pilot
WARNING
Do not use Pilot-
to-Open check
valves in load
holding applications where
either overrunning loads are
possible; or, load release
speed is critical. Failure to
observe these guidelines
may result in bodily injury or
damage to equipment.
EATON Vickers Screw-in Cartridge Valves V-VLOV-MC001-E1 June 2003
G-39
G
Model Code
18,9
(0.75)
31,7 (1.25) hex
1.062"–12 Thd.
57,9
(2.28)
Ø 22,17 (0.873)
Ø 23,75 (0.935)
2
3
1
F Type
47,7
(1.87)
2
3
1
S Type
4,0 (0.15) hex
Dimensions
mm (inch)
Torque cartridge in housing
A - 81-95 Nm
(60-70 ft. lbs)
S - 102-115 Nm
(75-85 ft. lbs)
Function
POC1 – Pilot operated check
valve
Valve Size
12 – 12 Size
Seals
Blank – Buna-N
V – Viton
®
Override option
F – None
S – Adjustable override
Valve body
O - Cartridge only
I - Inline body
B -SAE 4 - Bolt pad
N - Close coupled, nipple
mounting
G - Gasket mounted, single
D - Dual, line mounted
M - Dual, line mounted with
integral shuttle valve
P - Dual, gasket mounted
Valve housing material
A -Aluminum
S - Steel
Free flow cracking
pressure
005 – 0,3 bar (5 psi)
(Anti-cavitation)
030 – 2,0 bar (30 psi)
075 – 5,1 bar (75 psi)
100 – 6,9 bar (100 psi)
Special Features
00 – None
(Only required if valve has
special features - omitted
if “00”)
9
86
5
4
3
2
1
POC1 – 12 (V) – * – * * *** – *** – 00
1 2 3 4 5 6 7 8 9
Aluminum
housings can be
used for
pressures up to
210 bar (3000 psi)
Steel housings must be
used for operating
pressures above 210 bar
(3000 psi)
POC1-12
Housing port sizes
PORT SIZE VALVE BODY CODES
IBN/G/P D/M
SAE 6 ----
SAE 8 --8T-
SAE 10 10T - - 10T
SAE 12 12T - - 12T
1/4" BSPP ---
3/4" BSPP ---
1/2" BSPP 4G - 4G 4G
SAE-Code 61 6G 6T
For housing part numbers and dimensions see section J.
Note -M, P, & D housings use two POC1-12 valves.
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