AstralPool Clear Series check valve Ø 50 with spring

AstralPool Clear Series check valve Ø 50 with spring

The AstralPool Clear Series check valve Ø 50 with spring is a transparent non return valve for 50 mm pool pipework. Its clear PVC body lets you see the internal flap and flow at a glance, while the integrated spring provides fast, secure closing to prevent backflow in filtration, heating and treatment circuits.

Spring assisted non return function

This Clear Series model is equipped with an internal spring that helps the flap close immediately when the pump stops or when flow reverses. The spring assisted design improves sealing reliability in both horizontal and vertical lines and reduces the risk of water draining back through filters, heaters or salt chlorinators when the system is off.

The calibrated spring force is designed to keep pressure loss low during normal operation while still providing a firm, positive closing action when needed.

Transparent body for instant visual control

The AstralPool Clear Series check valve Ø 50 with spring features a fully transparent PVC U body and clear lid. This 360 degree visibility lets you confirm in seconds whether water is flowing, if the flap is opening correctly and whether air or debris are present in the line. The valve also serves as a compact sight glass in critical sections of the hydraulic circuit.

Visual access is especially useful during start up, after maintenance or when troubleshooting circulation problems, because you can see what the non return valve is doing without disassembling any pipework.

Low pressure loss and easy maintenance

Despite the spring mechanism, the wide opening flap design keeps head loss low when the valve is open. The flap lifts almost entirely out of the flow path, so filtration and heating circuits maintain good hydraulic efficiency. A large threaded locking ring allows the transparent lid to be removed without tools, giving direct access to the flap, spring and seals for cleaning or replacement.

• Wide opening flap for minimal resistance in normal flow.
• Threaded lid that can be opened by hand for quick inspection.
• Union connections on inlet and outlet for easy installation and removal.

Routine maintenance can often be limited to a simple internal cleaning when scale or debris accumulate, which helps extend the service life of the valve.

Durable materials for modern pool systems

The AstralPool Clear Series check valve Ø 50 with spring is moulded from PVC U with high chemical and mechanical resistance for use in pool environments. The internal spring is corrosion protected, making the valve suitable for installations treated with traditional chlorine or salt electrolysis and for higher salinity applications within typical pool operating conditions.

The valve is designed for standard swimming pool pressures and temperature ranges, providing a robust non return solution for both new builds and renovations of residential and small commercial pools with 50 mm pipework.

Typical installation points

Thanks to its Ø 50 union connections and compact body, this check valve can be installed at several strategic positions in the hydraulic scheme wherever backflow must be prevented and visual control is desirable.

• On the discharge line between pump and filter to avoid reverse circulation.
• Upstream of a heat pump, heater or solar exchanger to protect against draining.
• On lines feeding salt chlorinators or dosing equipment to stabilise flow direction.

Correct orientation following the flow direction arrow is essential. In many cases the spring assisted version is preferred when the valve is mounted horizontally or in installations where rapid, positive closing is required for reliable non return protection.