DIRECTIONAL VALVES
PD12-40 Piloted 3-Way Spool, External Vent
DESCRIPTION
A screw-in, cartridge-style, pilot-operated, spool-type, hydraulic directional valve for
three-way circuits requiring remote pilot actuation.
OPERATION
In neutral (unpiloted), the PD12-40 allows fl ow from ➂ to ➁ bidirectionally, while fl ow
is blocked at
➃. V is a spring chamber vent-to-atmosphere, which is internally O-ring
sealed from the cartridge fl ow paths.
On remote pilot signal at
➀, the valve shifts to open from ➂ to ➃, while blocking fl ow
at
➁.
Because of the vented spring chamber, the cartridge may be fully pressurized at any
port without affecting required pilot pressure.
FEATURES
• Hardened spool and cage for long life.
• Cost effective cavity.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Proof Pressure: 420 bar (6090 psi)
Flow: See Performance Chart
Internal Leakage: 164 cc/minute (10 cu. in./minute) max. at 207 bar (3000 psi)
Pilot Pressure Required with 7.6 bar (110 psi) Spring:
To Spool Crossover: 7.6 bar (110 psi)
To Full Spool Shift: 9.1 bar (132 psi)
Oil Volume Required to Full Shift: 1.32 cc (0.08 cu. in.)
Temperature: -40 to 120°C with standard Buna seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Cavity: VC12-4; See page 9.112.2
Cavity Tool: CT12-4XX; See page 8.600.1
Seal Kit: SK12-4X-MMM; See page 8.650.1
Cap Vent Seal: Part Number 6003121
SYMBOLS
USASI: ISO:
4.341.1
PERFORMANCE (Cartridge Only)
12.1/175
9.6/140
7.2/105
4.8/70
2.4/35
22.7
6
45.4
12
90.8
24
FLOW lpm/gpm
PRESSURE DROP bar/psi
➂ to ➃ or ➂ to ➁
32 cSt/150 ssu oil at 40°C
68.1
18
113.6
30
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Note: This valve is designed with a dynamic oil-to-atmosphere seal in the
vent section. Ambient conditions will cause this vent seal to degrade which
will reduce the valve’s cycle life. If this could cause a problem, we suggest
that a non-vented model be selected. Consult factory for assistance.
Blue rectangles are links to other catalog pages.
DIMENSIONS
Cartridge: Weight: 0.28 kg. (0.61 lbs.)
Steel with hardened work surfaces;
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Standard Ported Body: Weight:
1.50 kg. (3.30 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.012.1
TO ORDER
PD12-40__ - __ __ __ - __ - __
Option
None
(Blank)
Open Transition N
Porting
Cartridge Only 0
SAE 10 10T
SAE 12 12T
PD12-40
4.341.2
Seals
N Buna N (Std.)
NS Buna N with Sealed Spool
V Fluorocarbon
VS Fluorocarbon with Sealed Spool
Bias Spring
110 7.6 bar (110 psi)
170 11.7 bar (170 psi)
Optional bias springs considered
on OEM request.
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MATERIALS
Blue rectangles are links to other catalog pages.
