Diesel Engine Controls

SF08-21 — Poppet-Type, 2-Way, Normally Open, High Pressure
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SF08-21 Valve

SYMBOL:
SF08-21 Valve symbol

DESCRIPTION
A solenoid-operated, 2-way, piloted, poppet-type, normally open, screw-in, cartridge valve
designed for low leakage in higher pressure load-holding applications, such as diesel engine
braking applications.

OPERATION
When de-energized, the SF08-21 allows flow from 2 to 1, while flow from 1 to 2 is severely
restricted. When energized, the valve closes, blocking flow from 2 to 1. In this mode, flow
from 1 to 2 will be allowed after overcoming the solenoid force. This requires 3.4 to 10.3 bar
(50 to 150 psi).
Operation of Manual Override Option: To override, push and hold override button.

FEATURES
• Compatible with diesel fuel types 1 and 2.
• Corrosion-resistant plating.
• Stainless steel options available - consult factory.
• Hardened seat for long life and low leakage.
• Optional coil voltages and terminations.
• Efficient wet-armature construction.
• Cartridges are voltage interchangeable.
• Unitized, molded coil design.
• Continuous-duty rated coil.
• Manual override option.
• Optional waterproof E-Coils rated up to IP69K.
• Industry common, compact size.

RATINGS
Operating Pressure: 345 bar (5000 psi)
Flow: Up to 30 lpm (8 gpm)
Internal Leakage: 0.15 cc/minute (3 drops/minute) max. at 345 bar (5000 psi)
Temperature: -40° to 100°C (-40° to 212°F) with standard Buna seals
Coil Duty Rating: Continuous from 85% to 115% of nominal voltage
Response Time: First indication of change of state with 100% voltage supplied
  at 80% of nominal flow rating: Energized: 39 msec. De-energized: 35 msec.
Initial Coil Current Draw at 20°C: Standard Coil: 1.2 amps at 12 VDC;
  0.13 amps at 115 VAC (full wave rectified).
  E-Coil: 1.4 amps at 12 VDC; 0.7 amps at 24 VDC
Minimum Pull-in Voltage: 85% of nominal at 207 bar (3000 psi)
Filtration: Compatible with ISO Classification 19 (25 µm), NAS classification
Fluids: For use with common diesel fluids
Installation: No restrictions; See page 9.020.1
Cavity: VC08-2; See page 9.108.1_2w
Cavity Tool: CT08-2xx; See page 8.600.1
Seal Kit: SK08-2x-T; See page 8.650.1
Coil Nut: Part No. 7004410

PERFORMANCE:

SF08-21 Valve Performance Chart
  DIMENSIONS:

SF08-21 Valve Dimensions

MATERIALS:

Cartridge: Weight: 0.09 kg. (0.20 lbs.);
Steel with hardened work surfaces.
Zinc-plated exposed surfaces; Polyurethane cast O-rings and Fluorocarbon back-up standard.

Standard Ported Body:
Weight: 0.54 kg. (1.2 lbs.); Ductile iron standard, rated to 345 bar (5000 psi).
See page 8.008.1_2w.

Standard D-Coil: Weight each:
0.11 kg. (0.25 lbs.); Unitized thermoplastic encapsulated, Class H high temperature magnetwire.
See page 3.200.1_08-size.

E-Coil: Weight: 0.14 kg. (0.3 lbs.); Perfect wound, fully encapsulated with rugged external metal shell; Rated up to IP69K with integral connectors.
See page 3.400.1_08-size.
  ORDERING CHART:

SF08-21 Ordering Chart

More Diesel Control Products.
PDF file of this page. STP file for SF08-21. Get Custom Powertrain Control Engineering Assistance