DIRECTIONAL VALVES

PD12-42 Piloted 3-Way Spool, Internal Vent

USASI:

ISO:

SYMBOLS

PERFORMANCE

(Cartridge Only)

4.351.1

12.1/175

9.6/140

7.2/105

4.8/70

2.4/35

22.7

68.1

FLOW lpm/gpm

PRESSURE DROP bar/psi

113.6

45.4

➂ to ➃ or ➂ to ➁

32 cSt/150 ssu oil at 40°C

90.8

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 PD12-42 allows ﬂ ow from ➂ to ➁ bidirectionally while

➃ is blocked.

On remote pilot signal at

➀, the valve shifts to open from ➂ to ➃, while blocking

ﬂ ow at

➁.

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.

Note: Consult factory for applications where bi-directional ﬂ ow is required when the

valve is in the piloted position.

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: 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

OPEN TRANSITION:

HYDRAFORCE

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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

PD12-42

4.351.2

TO ORDER

PD12-42

__ - __ __ __ - __ - __

Option

None

(Blank)

Open Transition N

Seals

N Buna N (Std.)

NS Buna N with Sealed Spool

V Fluorocarbon

VS Fluorocarbon with Sealed Spool

Bias Spring

60 4.1 bar (60 psi)

110 7.6 bar (110 psi)

170 11.7 bar (170 psi)

Optional bias springs considered

on OEM request. Porting

Cartridge Only 0

SAE 10 10T

SAE 12 12T

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