Parker NV311P-4-4 Straight Needle Valve 1/4 in Brass

Product Description

The PARKER NV311P-4-4 is a straight-pattern needle valve designed for precise flow control in fluid and gas systems. It features a brass body and brass needle, with a Poly-Tite compression inlet connecting to a 1/4 inch male NPTF pipe end. At 1.22 inches overall length and 1.18 inches overall height, this compact valve fits in tight plumbing assemblies. It handles pressures up to 150 psi and operates across a temperature range of 0 degrees F to 250 degrees F. Licensed plumbers and HVAC technicians typically install this valve where fine-tuned shutoff or throttling is needed in a small-diameter line.

This valve suits residential and light commercial plumbing, refrigeration, and HVAC applications where a 1/4 inch line requires throttling or isolation. The Poly-Tite end accepts 1/4 inch OD tubing without soldering, making it a practical choice for service connections, instrument lines, and refrigerant or fluid sampling points. The NPTF male pipe end threads directly into standard fittings and manifolds.

Key Features

• Straight valve body for in-line installation in 1/4 inch pipe systems
• Poly-Tite compression inlet accepts 1/4 inch OD tubing without solder
• Brass body and brass needle for corrosion resistance in fluid service
• Rated to 150 psi maximum working pressure
• Wide temperature range: 0 degrees F to 250 degrees F
• 1/4 inch NPTF male pipe outlet threads into standard fittings

Compatibility

Designed as an OEM-style replacement or service fitting for 1/4 inch Poly-Tite to male NPTF pipe needle valve applications in plumbing, HVAC, and refrigeration systems.

Installation Notes

A licensed plumber or HVAC technician should install this valve. Depressurize and drain the line completely before removing any existing valve or fitting. Apply appropriate thread sealant to the NPTF male pipe threads per the applicable plumbing or mechanical code. Do not overtighten the Poly-Tite compression nut; seat the tubing fully before tightening to manufacturer guidance for compression fittings.