Parker NV311P-4-2 Straight Needle Valve 1/4x1/8 Brass

Product Description

The PARKER NV311P-4-2 is a straight-pattern needle valve designed for precise flow control in compressed air, refrigeration, and fluid systems. The body and needle are both brass construction, rated for up to 150 psi maximum working pressure and a temperature range of 0 to 250 degrees F. The inlet is a 1/4 inch Poly-Tite tube fitting and the outlet is a 1/8 inch male NPTF pipe thread, making it a compact transition fitting for tubing-to-pipe installations. Licensed HVAC technicians, plumbers, and industrial service techs install this valve where fine metering or shutoff is required in small-bore line sets or instrument connections.

This valve is suited for residential and light commercial HVAC, refrigeration, and pneumatic applications where a tubing run transitions to a threaded pipe port. The Poly-Tite end accepts 1/4 inch outside diameter tubing, while the 1/8 inch NPTF male thread connects directly to a female-threaded port or fitting. Its compact overall length of 1.13 inches and overall height of 1.17 inches allow installation in tight spaces such as equipment panels, instrument manifolds, or service ports. Installers working on metering or isolation tasks in low-flow lines will find this configuration straightforward to integrate.

Key Features

• Straight valve body with Poly-Tite inlet and 1/8 inch male NPTF outlet for tubing-to-pipe connections
• Brass body and brass needle for corrosion resistance in air, refrigerant, and fluid service
• 150 psi maximum working pressure for a wide range of low-to-medium pressure systems
• Operating temperature range of 0 to 250 degrees F covers typical HVAC and refrigeration service conditions
• Compact footprint at 1.13 inches overall length and 1.17 inches overall height
• NPTF thread type provides a pressure-tight mechanical seal without relying solely on sealant

Compatibility

Designed as an OEM-style replacement or service valve for systems using 1/4 inch outside diameter tubing with a 1/8 inch NPTF female port, commonly found in HVAC controls, refrigeration equipment, and pneumatic instrument lines.

Installation Notes

This valve is typically installed by licensed HVAC technicians or plumbers working on low-pressure fluid or gas lines. Shut off and depressurize the system fully before removing or installing any needle valve. Apply thread sealant compatible with the system media to the male NPTF threads per the fitting manufacturer and applicable codes. Do not overtighten the Poly-Tite compression end, as brass fittings are susceptible to thread and ferrule damage from excessive torque.