Valves - Directional Controls - Piloted Directional Valve - 2-position 2-way - External Vent - Normally Closed

PD12-44

PILOTED DIRECTIONAL VALVE

Overview

Description

The PD12-44 is a screw-in, cartridge style, pilot-operated, spool type, hydraulic directional valve

Operation

In neutral position the valve blocks flow from port 2 to 3. On remote pilot signal at port 1, the valve's spool shifts to allow flow from port 2 to 3 bidirectionally. The spring chamber is vented to port 4 which is internally o-ring sealed from the cartridge flow paths. Pressure on port 4 will directly (1:1) affect the pilot pressure required and must be added to the bias spring value

Features

  • Hardened spool and cage for long life.
  • Cost-effective cavity.
Pressure Ratings
Pressure rating:
  • 241 bar (3500 psi)
Temperature Ratings
Operating fluid temperature:
  • -40 to 120 °C (-40 to 248 °F)
Flow Ratings
Maximum internal leakage:
  • 245 ml/min (15 in³/min) At 207 bar (3000 psi)
  • 0 lpm (0 gpm) From port 1 and 2 with sealed spool
Materials:
  • steel with work surfaces hardened. External surfaces are zinc plated
Unit weight:
  • 0.28 kg (0.61 lb)
PD12-44_Perf_Chrt
PD12-41_Dim_Dwg

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: 1.5 kg (3.3 lb); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi). Ductile iron bodies available; dimensions may differ.

Cavity:
Cartridge installation torque:
  • 44.7 to 50.2 N-m (33 to 37 ft-lb)
Seal kit:
  • SK12-4N-MMM Buna N
  • SK12-4V-MMM Viton
  • SK12-4P-MMM Polyurethane
PD12-44_Order
POSITION
CODE
DESCRIPTION
PD12-44-H-J-R
H
Line Body
H
0
No Body
H
10T
Aluminum SAE 10
H
12T
Aluminum SAE 12
H
12TD
Ductile Iron SAE 12
J
Seal
J
N
Buna-N
J
NS
Buna-N with a Sealed Spool
J
V
Fluorocarbon
J
VS
Fluorocarbon with a Sealed Spool
J
P
Polyurethane
J
PS
Polyurethane with a Sealed Spool
J
U
PPDI Urethane
J
US
PPDI Urethane with a Sealed Spool
R
Spring
R
110
110 psi Bias Spring
R
170
170 psi Bias Spring