DIRECTIONAL VALVES
PD16-S51 Piloted 3-Way Spool
DESCRIPTION
A screw-in, cartridge-style, pilot-operated, spool-type, hydraulic directional valve.
OPERATION
When in neutral the PD16-S51 allows flow between ports 2, 3 and 4. On remote pilot
signal at 1, the valve’s spool shifts to block all ports. The spring chamber is vented to
the tank through port 5. The vented spring chamber allows the valve to be fully pres-
surized at ports 1, 2, 3, and 4 without affecting required pilot pressure. Pressure at
port 5 will affect required pilot pressure.
FEATURES
• Hardened spool and cage for long life.
• 70, 90 and 140 psi bias springs available.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Flow: 0–151 lpm (0–40 gpm); See Performance Chart
Internal Leakage at 207 bar (3000 psi): 410 ml/minute (25 cu. in./minute) between
ports 3 and 2. 820 ml/minute (50 cu. in./minute) between ports 3 and 4.
Pilot Pressure Required: 4.1 bar (60 psi) mimimum
Oil Volume Required to Full Shift: 1.83 cc (0.11 cu. in.)
Temperature: -40 to 120°C
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 A 6-way body can be used for this
valve by plugging body port 2 and using body ports 3, 4, 5 and 6 as ports 2, 3, 4
and 5 for the valve.
Cavity: VC16-S5; See page 9.116.1
Cavity Tool: CT16-S5XX; See page 8.600.1
Seal Kit: SK16-S5X-BMMM; See page 8.650.1
USASI:
ISO:
SYMBOLS
PERFORMANCE
(Cartridge Only)
4.383.1
8.6/125
10.3/150
6.9/100
5.2/75
3.4/50
1.7/25
37.9
10
75.8
20
113.6
30
151.4
40
FLOW lpm/gpm
PRESSURE DROP bar/psi
- - - - 3 to 2 and 3 to 4
—— 3 to 2, 4
32 cSt/150 sus oil at 40°C
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Cartridge: Weight: 0.25 kg. (0.55 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Ported Body: Consult factory. A 6-way
body can be used for this valve by
plugging body port 2 and using body
ports 3, 4, 5 and 6 as ports 2, 3, 4
and 5 for the valve.
DIMENSIONS
MATERIALS TO ORDER
PD16-S51
4.383.2
PD16-S51 - __ __ __ - __ - __ __ __
Porting
Cartridge Only 0
Seals
N Buna N (Std.)
V Fluorocarbon
NS Buna N w/Sealed Spool 1 to 2 only
VS Fluorocarbon w/Sealed Spool 1 to 2 only
Bias Spring
†
70 4.8 bar (70 psi)
90 6.2 bar (90 psi)
140 9.7 bar (140 psi)
Optional bias springs considered
on OEM request.
†
Note: 90 psi bias spring is the
minimum required for use with
sealed spool.
4.00
101.6
2.03
51.6
1.50
38.1
ACROSS FLATS
TORQUE:
50 ft-lbs (67.7 Nm)
max.
INCH
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