DIRECTIONAL VALVES

PD12-41 Piloted 3-Way Spool, Internal Vent

USASI:

ISO:

SYMBOLS

PERFORMANCE (Cartridge Only)

4.346.1

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 PD12-41 allows ﬂ ow from ➂ to ➃. ➁ is blocked.

On remote pilot signal at

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

ﬂ ow to

➃.

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 normal or spring-offset 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: 246 cc/minute (15 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 9.112.1

Cavity Tool: CT12-4XX; See page 8.600.1

Seal Kit: SK12-4X-MMM; See page 8.650.1

OPEN TRANSITION:

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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

PD12-41__ - __ __ __ - __ - __

Porting

Cartridge Only 0

SAE 10 10T

SAE 12 12T

PD12-41

4.346.2

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.

Option

None

(Blank)

Open Transition N

†

Note: 110 psi bias spring is the

minimum required for use with

sealed spool.

HYDRAFORCE

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