DIRECTIONAL VALVES
PD12-45 Piloted 2-Way Spool
DESCRIPTION
A screw-in, cartridge-style, pilot-operated, spool-type, hydraulic directional valve for
two-way circuits requiring remote pilot actuation.
OPERATION
In neutral (unpiloted), the PD12-45 allows fl ow from ➂ to ➁ bidirectionally.
The spring chamber is directed to port
➃.
On remote pilot signal at
➀, the valve shifts to block from ➂ to ➁, bidirectionally.
Since
➃ is common to the spring chamber, pressure on ➃ will directly (1:1) affect
the pilot pressure required, and must always be added to the bias spring value.
FEATURES
• Hardened spool and cage for long life.
• Cost effective cavity.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Flow: See Performance Chart
Internal Leakage: 115 cc/minute (7 cu. in./minute) max. at 207 bar (3000 psi)
Pilot Pressure Required Using 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
USASI:
ISO:
SYMBOLS
PERFORMANCE (Cartridge Only)
4.361.1
12.1/175
9.6/140
7.2/105
4.8/70
2.4/35
22.7
6
68.1
18
FLOW lpm/gpm
PRESSURE DROP bar/psi
113.6
30
45.4
12
➁ to ➂ or ➂ to ➁
32 cSt/150 ssu oil at 40°C
90.8
24
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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:
1.5 kg. (3.3 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
DIMENSIONS
MATERIALS
TO ORDER
PD12-45
4.361.2
PD12-45 - __ __ __ - __ - __
Porting
Cartridge Only 0
SAE 10 10T
SAE 12 12T
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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