Solenoid-Operated On/Off Valve

SF08-21 — Poppet-Type, 2-Way, Normally Open, High Pressure
  Selection guide - similar valves.
  PDF file of this page.
  STP file for SF08-21.
  Request a quote.

SF08-21 Valve

SYMBOL:
SF08-21 Valve symbol

DESCRIPTION
A solenoid-operated, 2-way, normally open, piloted poppet-type, screw-in hydraulic
cartridge valve designed for low leakage in higher pressure load-holding 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).
For bi-directional capability, see model SF08-23, page 1.051.1.
Operation of Manual Override Option: To override, push and hold override button.

FEATURES
• Continuous-duty rated coil.
• Corrosion-resistant plating.
• Hardened seat for long life and low leakage.
• Optional coil voltages and terminations.
• Cartridges are voltage interchangeable.
• Unitized, molded coil design.
• Manual override option.
• Optional waterproof E-Coils rated up to IP69K.
• Industry common, compact size.

RATINGS
Operating Pressure: 345 bar (5000 psi)
Proof Pressure: 359 (5200 psi)
Burst Pressure: 724 bar (10,500 psi)
Flow: Up to 37 lpm (10 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
   -54 to 107°C (-56 to 225°F) with standard polyurethane 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 ms De-energized: 35 ms
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: 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: 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 Graph
DIMENSIONS:

SF08-21 Valve Dimensions

MATERIALS:

Cartridge: Weight: 0.09 kg (0.20 lb); Steel with hardened work surfaces. Corrosion-resistant zinc-nickel plated exposed surfaces; Polyurethane cast O‑rings and Fluorocarbon back-up standard.

Standard Ported Body:
Weight: 0.54 kg (1.2 lb); 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 lb); Unitized thermoplastic encapsulated, Class H high temperature magnet wire.
See page 3.200.1_08-size.

E-Coil: Weight: 0.14 kg (0.3 lb); 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

Selection guide - similar valves.
PDF file of this page. STP file for SF08-21. Request a quote.