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Brass pilot-operated solenoid valve, 1/2 inch NPTF connections, PTFE seals, normally closed

Red Hat

Red Hat 8220G405 2-Way Solenoid Valve 1/2 in NPTF Brass PTFE

SKU CH-VH85-T6146

Pilot-operated brass valve with PTFE seals controls hot water up to 210°F and steam up to 300°F at 1/2 inch NPTF

  • TypeOther
  • Pilot-operated design enables automated flow control for hot water and steam
  • Normally closed configuration provides reliable shutoff when de-energised
  • Brass body with PTFE seals withstands fluid temperatures up to 210°F water and 300°F steam
  • Watertight coil enclosure with Class H insulation suits ambient conditions from 14°F to 140°F
  • Flow coefficient of 4.7 Cv delivers efficient media passage through 1/2 in NPTF connections

ASCO 8220G405 pilot-operated solenoid valve

This brass-bodied valve controls hot water and steam flow with a 1/2 inch NPTF connection and normally closed operation. PTFE seals handle fluid temperatures up to 210°F for water and 300°F for steam. The pilot-operated diaphragm and piston design provides a flow coefficient of 4.7 for automated fluid control.

Replaces manual or worn shut-off valves in steam

The jump is worth it when a system needs reliable, electrically actuated flow control with a watertight coil enclosure and Class H insulation. It suits applications requiring automated shut-off where ambient temperatures stay between 14°F and 140°F. The 150 psi water and 50 psi steam pressure differentials cover many commercial heating and process loops.

Practical limits of the pilot-operated interface

A minimum pressure differential is required to shift the diaphragm and piston, so very low-pressure systems may not actuate reliably. The coil draws 18 watts and needs a 1/2 inch conduit connection for wiring. Maximum steam pressure differential is capped at 50 psi, restricting use in high-pressure steam mains. Ambient temperatures above 140°F can degrade coil insulation over time.

Highlights

  • Pilot-operated design enables automated flow control for hot water and steam
  • Normally closed configuration provides reliable shutoff when de-energised
  • Brass body with PTFE seals withstands fluid temperatures up to 210°F water and 300°F steam
  • Watertight coil enclosure with Class H insulation suits ambient conditions from 14°F to 140°F
  • Flow coefficient of 4.7 Cv delivers efficient media passage through 1/2 in NPTF connections

Specifications

BrandASCO
TypeOther

Questions about this item

What pipe size and thread type does the 8220G405 valve require for mounting?

The valve uses 1/2 inch nominal pipe size with NPTF inlet and outlet connections.

What electrical connection step is often missed when installing the 8220G405 solenoid valve?

The coil requires a 1/2 inch conduit connection with 18 inch leads that must be properly sealed in the watertight enclosure.

Which seals on the 8220G405 will need replacement after extended steam service at 300°F?

The PTFE diaphragm and piston seals are the wear items that degrade under repeated high-temperature steam cycles.

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