AstralPool Clear Series valve spring D50 - 4404120192

AstralPool Clear Series valve spring D50

The AstralPool Clear Series valve spring D50 is the original replacement spring for Clear Series check valves with 50 mm connections. This stainless steel, corrosion protected spring restores the correct closing force on the internal flap so the non return valve continues to block backflow reliably in pool filtration and treatment circuits.

Original spring for Clear Series Ø 50 check valves

In AstralPool Clear Series check valves, the internal flap is assisted by a spring that helps it return quickly to the closed position when the pump stops or when flow reverses. The AstralPool Clear Series valve spring D50 is manufactured to the same dimensions and characteristics as the factory fitted spring, ensuring correct movement of the flap and secure closing in all normal operating conditions.

Using the correct reference spring is essential to maintain the non return function. A spring that is too weak may allow reverse flow, while an incorrect or overly strong spring can increase pressure loss or cause premature wear of the flap and seat.

When to replace the valve spring

Over time, the valve spring is exposed to continuous movement, chlorinated water and, in many cases, saltwater. Even with protective coatings, this can lead to loss of elasticity or local corrosion. Replacing the worn component with a new AstralPool Clear Series valve spring D50 is recommended whenever you notice:

• Backflow through the line when the pump stops.
• A flap that closes slowly or does not seat properly.
• Visible corrosion, deformation or breakage of the spring during inspection.

Fitting a new spring at the right time helps avoid circulation problems such as loss of prime, unwanted draining of lines or reverse flow through filters, heaters and chlorinators.

Easy maintenance with Clear Series design

The Clear Series valve body is fully transparent and features a removable threaded lid, which makes access to the internal spring straightforward. Once the lid is unscrewed and the flap assembly removed, the AstralPool Clear Series valve spring D50 can be replaced without cutting or modifying the pipework.

• Compatible with Clear Series check valves D50 with transparent body.
• Spring replacement can be done during routine cleaning of the flap and seals.
• No change to the PVC body or unions is required.

This service friendly layout allows pool technicians and experienced owners to complete the intervention quickly, reducing system downtime and keeping the hydraulic circuit in optimal condition.

Installation recommendations

Correct installation of the AstralPool Clear Series valve spring D50 ensures smooth, reliable operation of the check valve. All work should be carried out with the pump stopped and the line depressurised.

• Close isolation valves and release pressure before opening the check valve.
• Unscrew the locking ring and remove the transparent lid according to the Clear Series instructions.
• Extract the flap assembly, remove the old spring and install the new D50 spring in the original position.
• Check that the flap moves freely and returns firmly to the closed position.
• Reassemble the valve, tighten the lid uniformly and test for leaks and correct closing when the pump stops.

After replacement, observe the transparent body during start and stop cycles to verify that the flap opens fully with flow and closes quickly and completely when the flow stops, confirming that the new spring is working correctly.