Parker 73312BN4UNJ0 Solenoid Valve 1/2 in Npt Brass Normally Closed

Product Description

The PARKER 73312BN4UNJ0 is a normally closed, direct-acting solenoid valve designed for precise fluid and gas control in industrial and mechanical systems. Built with a brass body and NBR (Buna-N) seal, it handles a maximum working pressure of 180 psi and a maximum temperature of 185 degrees F. The valve features a 0.5-inch NPT port and a Cv flow factor of 3.6, supporting strong flow capacity in a compact form. Multiple coil voltage options are available, including 12 VDC, 24 VDC, 24 VAC/60 Hz, 120 VDC, 120 VAC/60 Hz to 110 VAC/50 Hz, and 240 VAC/60 Hz to 220 VAC/50 Hz. Note that an integrated coil is required for complete valve operation and must be specified separately. Licensed HVAC technicians, plumbers, and industrial mechanics are the primary installers of this valve.

This valve suits residential and light commercial applications where reliable normally closed shutoff is required for water, air, or compatible fluid lines. Common install scenarios include hydronic systems, refrigeration circuits, compressed air lines, and process fluid control. The 0.5-inch NPT thread connection is standard across most domestic and commercial piping systems, making this a straightforward drop-in for replacement or new-install work. The minimum operating pressure differential is 10 psi, which should be confirmed against system conditions before installation.

Key Features

• Normally closed valve state — de-energized position blocks flow without power applied
• Brass body construction for corrosion resistance in water and compatible fluid service
• NBR seal material rated for broad compatibility with water, air, and light petroleum fluids
• Multi-voltage coil compatibility: 12 VDC, 24 VDC, 24 VAC, 120 VDC, 120 VAC, 240/220 VAC
• Cv rating of 3.6 supports adequate flow capacity through a 0.5-inch orifice
• Maximum working pressure of 180 psi suits most commercial and residential system pressures

Compatibility

Designed as an OEM-style replacement or new-install solenoid valve for systems using 0.5-inch NPT connections operating within the stated pressure, temperature, and voltage parameters.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified industrial mechanic in accordance with applicable local codes. Shut off system pressure and de-energize all electrical circuits before beginning valve replacement or installation. Confirm that the system fluid and temperature are compatible with brass body and NBR seal materials before installation. An integrated coil must be sourced and installed separately — the valve body alone is not functional without the coil assembly.