CHECK VALVE IN BACKFLOW PREVENTION DEVICE

摘要

A check valve module. The check valve module includes an orifice, where the orifice is configured to allow the water flow stream through the check valve module. The check valve module also includes a clapper. The clapper is configured to allow the water flow stream through the orifice when open and prevent the water flow stream through the orifice when in a closed position by mating with the orifice. The check valve module further includes a fulcrum apparatus about which the clapper is allowed to rotate, a rotational constraint apparatus which directs the rotation of the clapper and a lateral constraint apparatus which directs the motion of the fulcrum toward and away from the orifice.

主权项

1. A backflow prevention device, the backflow prevention device comprising:
a housing defining a water flow stream; an upstream shutoff valve, wherein the upstream shutoff valve is configured to allow a user to control the water flow stream through the housing; a check valve module:
located within the housing downstream of the upstream shutoff valve; andincluding: an orifice, wherein the orifice is configured to allow the water flow stream through the check valve module; a clapper, wherein the clapper is configured to:
allow the water flow stream through the orifice when open; andprevent the water flow stream through the orifice when in a closed position by mating with the orifice; a fulcrum apparatus about which the clapper is allowed to rotate; a rotational constraint apparatus which directs the rotation of the clapper; and a lateral constraint apparatus which directs the motion of the fulcrum toward and away from the orifice; a downstream shutoff valve:
located downstream of the check valve module; andconfigured to allow a user to control the water flow stream through the housing.