- intended for protection against the return of medium to the system,
- outlet angle restricted in the range of 0-30 °; greater outlet angle values provide higher holdfast; other structural solutions are made to special orders,
- valve can be provided with a counterweight for better holdfast or easier opening,
- available wall and flange variants or a version for cementing,
- check valves are used as storm flaps in places at risk of water-level-rise or backwater,
- intended for operation with air, gas, drinking water, process water, sewage and other media.
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