Directional Valves

PD12-34 — Piloted, 2-Way, Spool, External Vent, Normally Closed
  Selection guide - similar valves.
  PDF file of this page
  STP file for PD12-34
  Request a quote

PD12-30 Valve

SYMBOL:
PD12-34 Valve symbol

DESCRIPTION
A screw-in, cartridge-style, pilot-operated, spool-type, normally-closed,
hydraulic directional valve for two-way circuits requiring remote pilot actuation.

OPERATION
In neutral (unpiloted), the PD12-34 blocks flow between 3 and 2. ‘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 block 3 to 2 bidirectionally. 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): 82 cc/minute (5 cu. in./minute)
Pilot Pressure Required: for 7.6 bar (110 psi) spring:
   to Cross-Over: 7.6 bar (110 psi); to Full 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: VC12-3; See page 9.112.1_3w
Cavity Tool: CT12-3xx; See page 8.600.1
Seal Kit: SK12-3x-MM; 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:

PD12-30 Valve Performance Chart
  DIMENSIONS:
PD12-30 Valve Dimensions

MATERIALS:

Cartridge: Weight: 0.23 kg (0.50 lb);
Steel with hardened work surfaces.
Zinc-plated exposed surfaces; Buna N
O-rings and polyester elastomer back-ups standard.

Standard Ported Body:
Weight: 1.13 kg (2.50 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_3w
  ORDERING CHART:

PD12-34 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for PD12-34. Request a quote.