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E: info@chinahdm.com
E: info@chinahdm.com
Industrial zone, Binhai, Jiaojiang, Taizhou, Zhejiang, China
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The 4FL Hose Plug represents a specialized solution for securing hydraulic connections in industrial and mobile applications, designed to provide reliable sealing for both operational and maintenance scenarios. Unlike temporary plugs, the 4FL is engineered for semi-permanent installation in hydraulic systems where secure, leak-free connections are required between maintenance intervals. Its robust construction and precision design make it suitable for use in active hydraulic circuits as well as for sealing unused ports and connections. This versatility has made the 4FL Hose Plug a valuable component in hydraulic systems across industries, where it contributes to overall system efficiency by preventing fluid loss and maintaining pressure integrity.
The 4FL Hose Plug features a threaded connection design optimized for secure engagement with hydraulic hoses and port openings. It utilizes standard hydraulic thread forms, with NPT (National Pipe Taper) and BSP (British Standard Pipe) options available to accommodate different regional and equipment-specific requirements. The plug's external hex design allows for secure tightening with standard tools, ensuring proper installation torque can be achieved consistently. This design feature minimizes the risk of loosening due to vibration or pressure fluctuations common in hydraulic systems.
Engineered for reliable performance in medium to high-pressure hydraulic systems, the 4FL Hose Plug is rated for a maximum operating pressure of 3,000 to 5,000 PSI (207 to 345 bar), depending on size and material configuration. This pressure range covers the requirements of most industrial and mobile hydraulic applications, from agricultural machinery to industrial processing equipment. The plug maintains its sealing integrity even during pressure spikes and transient conditions, providing stable performance across varying operational demands.
The 4FL Hose Plug is available in multiple material configurations to suit different application environments. The standard version features a carbon steel body with a protective zinc plating that provides good corrosion resistance for general-purpose applications. For enhanced corrosion resistance in harsh environments, a 316 stainless steel option is available, offering superior protection against chemical exposure and environmental elements. The plug incorporates a nitrile rubber O-ring as standard, with Viton® options available for applications involving high temperatures or aggressive hydraulic fluids.
In the mobile hydraulics sector, the 4FL Hose Plug is widely used in agricultural equipment, construction machinery, and utility vehicles. It secures unused hydraulic ports on control valves, manifolds, and hydraulic cylinders, preventing fluid loss and contamination ingress during equipment operation. Its vibration-resistant design ensures reliable performance in off-road conditions where machinery is subjected to constant movement.
Within factory and industrial settings, the 4FL Hose Plug finds application in hydraulic power units, press systems, and manufacturing machinery. It is commonly used to seal auxiliary ports on hydraulic manifolds, pressure relief valves, and directional control valves that are not utilized in the specific system configuration. This helps maintain system pressure integrity while providing flexibility for future system modifications or upgrades.
While both serve sealing functions, the 4FL Hose Plug is designed primarily for semi-permanent installation in operational hydraulic systems, featuring a more robust construction for ongoing pressure containment. The 4MN, by contrast, is optimized for temporary sealing during maintenance, storage, or transportation. The 4FL typically has a higher continuous operating pressure rating and features a more secure thread engagement design for long-term installation, while the 4MN prioritizes easy installation and removal for temporary applications.
Thread type selection depends on the hydraulic system's design standards. NPT threads are common in North American equipment and feature a taper that creates a seal through thread interference. BSP threads (both parallel BSPP and tapered BSPT) are prevalent in European and Asian equipment, with BSPP often using a separate O-ring for sealing. To ensure compatibility, identify the existing thread type using thread gauges or by consulting the equipment manufacturer's specifications. When in doubt, our technical team can assist with thread identification and selection.
The standard 4FL plug with nitrile O-ring is compatible with most mineral oil-based hydraulic fluids, water-glycol mixtures, and some synthetic fluids. For systems using phosphate ester fluids, silicone-based fluids, or operating at extreme temperatures, the Viton® O-ring option is recommended for improved chemical compatibility. The metal body (carbon steel or stainless steel) is compatible with virtually all hydraulic fluids, though stainless steel is recommended for systems where fluid composition might cause corrosion of carbon steel components.
Recommended installation torque varies by plug size and thread type, typically ranging from 10 ft-lbs for 1/4" plugs to 50 ft-lbs for 1" plugs. Always refer to the manufacturer's torque specification chart for your specific plug size and material. Proper torque is essential—insufficient torque may result in leaks, while excessive torque can damage threads or cause the plug to seize. A torque wrench with appropriate range should always be used to ensure proper installation.
The 4FL Hose Plug represents a specialized solution for securing hydraulic connections in industrial and mobile applications, designed to provide reliable sealing for both operational and maintenance scenarios. Unlike temporary plugs, the 4FL is engineered for semi-permanent installation in hydraulic systems where secure, leak-free connections are required between maintenance intervals. Its robust construction and precision design make it suitable for use in active hydraulic circuits as well as for sealing unused ports and connections. This versatility has made the 4FL Hose Plug a valuable component in hydraulic systems across industries, where it contributes to overall system efficiency by preventing fluid loss and maintaining pressure integrity.
The 4FL Hose Plug features a threaded connection design optimized for secure engagement with hydraulic hoses and port openings. It utilizes standard hydraulic thread forms, with NPT (National Pipe Taper) and BSP (British Standard Pipe) options available to accommodate different regional and equipment-specific requirements. The plug's external hex design allows for secure tightening with standard tools, ensuring proper installation torque can be achieved consistently. This design feature minimizes the risk of loosening due to vibration or pressure fluctuations common in hydraulic systems.
Engineered for reliable performance in medium to high-pressure hydraulic systems, the 4FL Hose Plug is rated for a maximum operating pressure of 3,000 to 5,000 PSI (207 to 345 bar), depending on size and material configuration. This pressure range covers the requirements of most industrial and mobile hydraulic applications, from agricultural machinery to industrial processing equipment. The plug maintains its sealing integrity even during pressure spikes and transient conditions, providing stable performance across varying operational demands.
The 4FL Hose Plug is available in multiple material configurations to suit different application environments. The standard version features a carbon steel body with a protective zinc plating that provides good corrosion resistance for general-purpose applications. For enhanced corrosion resistance in harsh environments, a 316 stainless steel option is available, offering superior protection against chemical exposure and environmental elements. The plug incorporates a nitrile rubber O-ring as standard, with Viton® options available for applications involving high temperatures or aggressive hydraulic fluids.
In the mobile hydraulics sector, the 4FL Hose Plug is widely used in agricultural equipment, construction machinery, and utility vehicles. It secures unused hydraulic ports on control valves, manifolds, and hydraulic cylinders, preventing fluid loss and contamination ingress during equipment operation. Its vibration-resistant design ensures reliable performance in off-road conditions where machinery is subjected to constant movement.
Within factory and industrial settings, the 4FL Hose Plug finds application in hydraulic power units, press systems, and manufacturing machinery. It is commonly used to seal auxiliary ports on hydraulic manifolds, pressure relief valves, and directional control valves that are not utilized in the specific system configuration. This helps maintain system pressure integrity while providing flexibility for future system modifications or upgrades.
While both serve sealing functions, the 4FL Hose Plug is designed primarily for semi-permanent installation in operational hydraulic systems, featuring a more robust construction for ongoing pressure containment. The 4MN, by contrast, is optimized for temporary sealing during maintenance, storage, or transportation. The 4FL typically has a higher continuous operating pressure rating and features a more secure thread engagement design for long-term installation, while the 4MN prioritizes easy installation and removal for temporary applications.
Thread type selection depends on the hydraulic system's design standards. NPT threads are common in North American equipment and feature a taper that creates a seal through thread interference. BSP threads (both parallel BSPP and tapered BSPT) are prevalent in European and Asian equipment, with BSPP often using a separate O-ring for sealing. To ensure compatibility, identify the existing thread type using thread gauges or by consulting the equipment manufacturer's specifications. When in doubt, our technical team can assist with thread identification and selection.
The standard 4FL plug with nitrile O-ring is compatible with most mineral oil-based hydraulic fluids, water-glycol mixtures, and some synthetic fluids. For systems using phosphate ester fluids, silicone-based fluids, or operating at extreme temperatures, the Viton® O-ring option is recommended for improved chemical compatibility. The metal body (carbon steel or stainless steel) is compatible with virtually all hydraulic fluids, though stainless steel is recommended for systems where fluid composition might cause corrosion of carbon steel components.
Recommended installation torque varies by plug size and thread type, typically ranging from 10 ft-lbs for 1/4" plugs to 50 ft-lbs for 1" plugs. Always refer to the manufacturer's torque specification chart for your specific plug size and material. Proper torque is essential—insufficient torque may result in leaks, while excessive torque can damage threads or cause the plug to seize. A torque wrench with appropriate range should always be used to ensure proper installation.