Practical and simple solution to eliminate the return of wastewater as well as bad odors and pests of rats, cockroaches and other insects coming from the sewage.
It is an ideal product for situations that require a slight loss of load in the direction of flow and when a great tightness is needed in the opposite direction; as for example in sewers, spillways, sewage treatment plants, tanks or manholes, to prevent non-desired backflow waters.

FEATURES OF NON RETURN FLAP VALVE

• It works autonomously, without human intervention, without electricity, without continuous maintenance.
• Manufactured in PHED for a great resistance against corrosion and aggressive environments.
• Mounting in end of line both in concrete wall or end of the pipe.
• Designed for protection against floods, river floods, odor control, and pest control.

PRINCIPLE OF OPERATION

Its function is to prevent water from returning to the system. Flap valves may be mounted at sewage systems outlets or culverts (for agricultural drainage ditches and natural water
courses) as well as in eflluent channels with an unstable water level. Flap valves can only be mounted to gravity sewer systems (non-pressure). They are not suitable for pump loads in particular to high-efficiency pumps.

The valve is activated by a water pressure acting on the plate. The lid remains closed until the increasing pressure of the water flowing from the pipe opens it, but closes when the pressure increases from the side of the receiver.