Parker 4M-V4LN-B Needle Valve 1/4 Inch Mnpt Brass 3000 Psi

Product Description

The PARKER 4M-V4LN-B is a straight-pattern needle valve designed for precise flow control in high-pressure fluid and gas systems. It features a brass body with a polytetrafluoroethylene (PTFE) seal, a round handle for manual operation, and male NPT connections on both ends. The valve measures 1.88 inches overall length and 3.06 inches overall height, with a maximum working pressure rating of 3,000 psi. It is sized for 1/4-inch pipe and is well suited for instrumentation, hydraulic, and pneumatic service lines where tight shutoff and repeatable throttling are required. Licensed plumbers, HVAC technicians, and industrial pipefitters are the primary installers of this valve type.

This valve is used in residential and light commercial applications where a compact, reliable shutoff or metering point is needed on 1/4-inch pipe runs. Typical install scenarios include instrument tubing headers, refrigeration service ports, compressed air test manifolds, and hydraulic control circuits. Its straight inline configuration makes it a direct fit in tight panel or manifold layouts where space is limited and precise flow adjustment is critical.

Key Features

• Straight-pattern body keeps flow path direct and minimizes pressure drop
• Brass construction provides good corrosion resistance across a wide range of fluid media
• PTFE seal material offers chemical compatibility with many gases and liquids
• 3,000 psi maximum working pressure suits high-pressure instrumentation and hydraulic lines
• Round handle allows manual throttling and positive shutoff without tools
• MNPT x MNPT end connections fit standard 1/4-inch male NPT pipe threads

Compatibility

Designed as an OEM-style replacement or direct installation needle valve for 1/4-inch MNPT pipe connections in high-pressure fluid, gas, and instrumentation systems.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified HVAC technician in accordance with applicable codes such as the IPC or IFGC. Depressurize and isolate the system completely before removing or installing any needle valve. Apply thread sealant or PTFE tape to the male NPT threads per standard practice, taking care not to overtighten fittings in brass bodies. Confirm system pressure does not exceed the valve rated maximum before returning the line to service.