Brass Spring Loaded Non Return Valves

Brass Spring Loaded Non Return Valves (also known as spring check valves) are compact, in-line valves designed to prevent reverse flow in pipework systems. They operate automatically using an internal spring-loaded mechanism, allowing fluid to flow in one direction only and closing quickly when flow stops or reverses.

 
Commonly used in plumbing, heating, HVAC, and industrial applications, these valves provide reliable backflow prevention and help protect pumps, equipment, and system integrity. Their spring-assisted closure ensures fast response and improved sealing performance compared to swing check designs, particularly in low-pressure or variable-flow systems.

 
Manufactured from durable brass with stainless steel internal spring components and elastomer sealing (typically NBR or EPDM depending on specification), they offer a strong balance of durability, corrosion resistance, and sealing efficiency. BSP threaded connections allow straightforward installation into standard pipework systems.

 
These valves are typically suitable for water, air, and non-aggressive fluids, and are designed for both horizontal and vertical installation depending on flow direction requirements.

Key Features

• Spring-loaded in-line design for automatic non-return operation 
• Brass body construction for durability and corrosion resistance
• Stainless steel internal spring for reliable actuation
• Tight sealing performance with elastomer seat (NBR/EPDM depending on variant)
• BSP threaded connections for easy installation
• Low cracking pressure (typically around 0.02 bar) for responsive operation
• Compact design suitable for confined installations
• Suitable for horizontal and vertical pipework (flow direction dependent)
• Minimal pressure loss in forward flow conditions

Applications

Water distribution systems, heating and cooling circuits, HVAC installations, booster pump sets, compressed air systems, irrigation, and general industrial pipework where reliable backflow prevention is required.

We offer nationwide next working day delivery on stocked products for orders placed before 12:00 pm, subject to stock availability.

Delivery charges are calculated based on your order's size, weight and destination and will be shown at checkout where applicable.

Some oversized, bespoke or non-stock items may require additional lead time. If this affects your order, we'll let you know as soon as possible.

Collection is available from our warehouses in Rochdale, Halesowen and East Kilbride, subject to stock availability. Please check the individual product listing for collection availability.