Directional Valves

PD12-40 — Piloted, 3-Way, Spool Valve, External Vent
  Selection guide - similar valves.
  PDF file of this page
  STP file for PD12-40
  Request a quote

PD12-40 Valve

SYMBOL:
PD12-40 Valve symbol

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 flow from 3 to 2 bidirectionally while
flow is blocked at 4. ‘V’ is a spring chamber vent-to-atmosphere, which is internally
O-ring sealed from the cartridge flow paths. On remote pilot signal at 1, the valve
shifts to allow flow between 3 and 4 while blocking at 2.
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: up to 113 lpm (30 gpm)
Maximum Internal Leakage at 207 bar (3000 psi): 164 cc/minute (10 cu. in./minute)
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 100°C (-40 to 212°F) with Buna seals;
   -26 to 204°C (-15 to 400°F) with fluorocarbon 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_4w
Cavity Tool: CT12-4xx; See page 8.600.1
Seal Kit: SK12-4x-MMM; See page 8.650.1
Cap Vent Seal: 6003121

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, or special seal be used. Consult factory for assistance.

PERFORMANCE:

PD12-40 Valve Performance Chart
  DIMENSIONS:
PD12-40 Valve Dimensions

MATERIALS:

Cartridge: Weight: 0.28 kg (0.61 lb);
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 lb); 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_4w
  ORDERING CHART:

PD12-40 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for PD12-40. Request a quote.