Swing check valves are protective devices in pipelines and pipe systems for the transport of liquid fluids.
They are used to prevent the return flow of the working fluid, and their action is automatic.
They are most widely used in drinking water distribution systems and irrigation, wastewater treatment and transport systems, as well as in district heating systems.
The non-return (check )valves allow flow in only one direction, which is why during installation you should pay attention to the fact that the direction of the arrow on the check valve housing corresponds to the direction of movement of the working fluid in the specific pipeline.
Check valves are made with a shut-off body (flap) that rotates around an axis that touches the shut-off body. A torsion spring of appropriate torque is installed on the shaft, which enables the swing check valve to seal well even at low backpressures.
The sealing surface on the non-return valve housing is welded with a corrosion-resistant electrode, and the sealing is done through a rubber ring located in the channel of the shut-off body. Check valves are made without flanges, and they are mounted between pipe flanges with appropriate flanges.
The nominal diameter ranges from DN 50 to DN 500 (mm), and the pressures from NP 2.5 to NP 16 (bar).
The housing and the shut-off body are made of structural steel by welding, and the shaft is made of corrosion-resistant steel. Sealing elements for fluid temperatures up to 80 ° C are made of EPDM, and for temperatures up to 150 ° C of special EPDM.
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