Gravity Circulation Checks and Non-Return Valves

for sanitary and HVAC (heating, venting and air-conditioning) applications.
Types:
SBO to prevent gravity circulation
RK70 especially suited for heating and hot-water installations.
RK71 for liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve. 
MB14 for liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve