Brass Spring Loaded Non-Return Valve 3/4″ Female BSP

This premium inline 3/4 inch brass non return valve offers high-performance fluid control and a foolproof method to prevent backflow for domestic plumbing, multi-zone landscape irrigation, and agricultural water networks. Cast from heavy-walled, high-tensile brass brassware, this mechanical check valve is built to handle persistent water pressures and strict industrial trade duties across the UK.

Featuring precision-cut 3/4″ parallel female BSP threaded ports on both ends, this inline valve integrates seamlessly into standard metal manifolds or MDPE compression fitting pipe configurations. Because a 3/4 inch brass non return valve relies on a built-in stainless steel internal spring mechanism, it automatically seals closed the microsecond fluid pressure drops or reverses direction. This one-way restriction guarantees absolute backflow prevention, keeping your main pump lines fully primed and ready for operation without water loss.

Technical Specifications & Key Features:

• Industrial-Grade Forged Brass: Manufactured from corrosion-resistant solid brass to safeguard against premature wear, hard water lime-scaling, and seasonal temperature stress.
• Stainless Steel Internal Spring: High-tensile AISI 302/316 grade stainless steel spring ensures immediate, snappy shutter closure and high-cycle split resistance.
• All-Orientation Installation: Thanks to its active spring-assisted sealing disc, this check valve functions flawlessly when fitted horizontally, vertically, or at an angle.
• Watertight NBR Seating: Outfitted with an anti-perishable nitryl rubber flat gasket to secure a reliable drop-tight seal under both low and high-pressure system spikes.

Common Irrigation & Plumbing Applications:

• Pump Line Priming Maintenance: Ideal for suction line setups to trap water inside vertical boreholes or surface pumps, eliminating air locks and dry-running.
• Backflow Contamination Prevention: Essential for separating clean mains supply runs from secondary storage tanks, chemical injectors, or agricultural wash bays.
• Zoned Pressure Protection: Keeps multi-zone solenoid manifolds pressurized evenly, preventing reverse pressure hammer shocks from jarring upstream pipe fittings.

Trade Installation & Assembly Guidelines:

Fitting your spring-assisted check valve is highly efficient when following standard mechanical plumbing trade steps:

1. Check Directional Flow: Locate the directional arrow embossed directly onto the brass outer casing. The valve must be installed with this arrow pointing toward the desired direction of water movement.
2. Seal the 3/4″ Threads: Clear any burrs from the mating 3/4″ male fittings. Wrap the male threads with high-density PTFE tape or a trade-grade jointing compound to ensure a watertight bond.
3. Tighten Securely: Screw the valve onto the pipework carefully by hand to avoid cross-threading. Use a smooth-jawed adjustable wrench on the hexagonal flat ends of the valve body to lock it in place.

System Care & Winterisation Best Practices:

To preserve your 3/4 inch brass non return valve across its multi-decade lifespan, ensure the system fluid remains free of heavy silt or abrasive sand particles, which can temporarily lodge in the NBR rubber seat. When prepping outdoor pipe networks for severe winter weather, the valve should be thoroughly blown through with air or fully isolated and drained. Trapped pockets of stagnant water inside the spring chamber can freeze, expand, and compromise the heavy brass casting.

Secure premium backflow protection for your next fluid project. Order your heavy-duty 3/4 inch brass non return valve from MB Irrigation today and take advantage of our rapid, next-day UK dispatch options.