Parker S71-3C4-4F Hydraulic Valve Fitting 5000 Psi 1/4 in

Product Description

The PARKER S71-3C4-4F is a straight hydraulic hose valve fitting engineered for high-pressure fluid control in demanding industrial and offshore applications. Built from stainless steel, it carries a maximum working pressure of 5,000 psi and handles temperatures from -35 degrees F to 250 degrees F. The 1/4-inch NPTF threaded connection provides a pressure-tight seal without the need for additional sealants in properly prepared ports. Part of Parker's Series 71 product line, this fitting is installed by hydraulic system technicians and mechanical contractors working on high-cycle or corrosive-environment lines where stainless construction is required.

This valve fitting is suited for industrial hydraulic lines and offshore drilling equipment where reliable, leak-free connections under sustained high pressure are critical. The straight body profile simplifies inline installations in tight plumbing runs. The NPTF thread form creates a mechanical seal through thread interference, making it a practical choice for systems where vibration or pressure spikes could compromise standard NPT connections. Its compact overall length of 1.96 inches fits into space-constrained manifolds and hose assemblies without special adaptation.

Key Features

• 5,000 psi maximum working pressure for high-demand hydraulic circuits
• Stainless steel construction resists corrosion in offshore and washdown environments
• NPTF threaded connection delivers a pressure-tight mechanical seal
• Straight body configuration simplifies inline hose and port installations
• Wide service temperature range: -35 degrees F to 250 degrees F
• 1/4-inch hose and thread size for compatibility with standard small-bore hydraulic lines

Compatibility

Designed for use with industrial hydraulic lines and offshore drilling applications as specified by the manufacturer. Verify port thread form and pressure rating against system requirements before installation.

Installation Notes

Installation should be performed by a qualified hydraulic technician familiar with high-pressure fluid system assembly. Depressurize and isolate the hydraulic circuit completely before removing or installing any fitting. NPTF threads rely on thread-form interference for sealing; inspect threads for damage and clean port surfaces before assembly. Torque to system or port manufacturer specifications using appropriate hydraulic fitting wrenches — do not over-tighten stainless fittings, as galling can occur.