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300L Fuel Tank Nozzle automatic Fuel nozzle OPW 1290
JH-300 Automatic Tanker Fuel Dispensing Nozzle: Technical Overview
1. Product Overview
The JH-300 is a high-flow, automatic shut-off nozzle designed for bulk fuel transfer in heavy-duty applications such as rail, tanker, and fuel storage tank filling. Its right-angle design enables close fitting to walls and corners, enhancing accessibility in confined spaces. The nozzle operates exclusively on pumped dispensing systems and features a durable die-cast aluminum body with integrated anti-loosening mechanisms to prevent oil leakage during prolonged use.
2. Technical Specifications
Parameter JH-300
Operation Mode Automatic
Min Back-Pressure Required 0.5 Bar / 7.25 PSI
Inlet Connection 2" BSP NPT Female
Swivel Included No (sold separately)
Spout Diameter 42 mm
Max Flow Rate 350 L/min
Material (Wetted Components) Aluminum (body/spout), Stainless Steel (springs/main stem), NBR/Viton (seals)
3. Construction & Working Principle
3.1 Key Components
Air-hole: Facilitates pressure sensing for automatic shut-off.
Sub-valve & Main Valve: Two-stage seal design prevents seal blowout under high pressure.
Diaphragm & Spring: Regulates pressure changes during fuel flow.
Venturi Inlet: Creates a vacuum effect to trigger shut-off.
3.2 Shut-off Mechanism
Startup: Opening the nozzle initiates fuel flow via pressure-driven main valve activation.
Flow Regulation: Reduced flow section increases velocity, lowering pressure and creating a vacuum (meiobar) in the diaphragm chamber.
Shut-off Trigger: When the spout touches the liquid surface, vacuum pressure closes the main valve and resets the mechanism.
4. Installation & Maintenance
Installation:
Tighten hose coupling with a wrench; avoid lubrication.
Use sealant (not Teflon tape) for NPT threads to prevent swivel damage.
Maintenance:
Keep the spout air-hole unblocked to ensure functionality.
Store in a nozzle boot after use to prevent damage.
5. Competitive Advantages vs. OPW 1290
Lightweight Design: Aluminum body reduces weight by 20% compared to steel alternatives.
Right-Angle Ergonomics: Enhances grip and control in tight spaces.
Dual Poppets: Enable nozzle operation under high inlet pressure (up to 50 PSI).
Venturi Shut-off: Ensures precise automatic shutoff without overflow.
6. Applications
Bulk fuel transfer for rail, tanker trucks, and storage tanks.
Suitable for diesel, gasoline, and other petroleum products.
Note: For optimal performance, ensure compatibility with pumped dispensing systems and follow installation guidelines strictly.
