SHUTOFF VALVE IN BACKFLOW PREVENTION DEVICE WITH VISUAL INDICATOR

摘要

A backflow prevention device. The backflow prevention device includes a housing defining a water flow stream. The housing includes an inlet configured to connect to a water supply and an outlet configured to connect to a system that uses water. The backflow prevention device also includes an upstream butterfly valve configured to allow a user to control the water flow stream through the housing and an upstream indicator post. The upstream indicator post is substantially parallel to the water flow if the upstream butterfly valve is closed and is substantially perpendicular to the water flow if the upstream butterfly valve is open. The backflow prevention device further includes a downstream butterfly valve configured to allow a user to control the water flow stream through the housing and a downstream indicator post.

主权项

1. A backflow prevention device, the backflow prevention device comprising:
a housing defining a water flow stream, wherein the housing includes:
an inlet configured to connect to a water supply; andan outlet configured to connect to a system that uses water; an upstream butterfly valve configured to allow a user to control the water flow stream through the housing; an upstream indicator post, wherein the upstream indicator post:
is substantially parallel to the water flow if the upstream butterfly valve is closed; andis substantially perpendicular to the water flow if the upstream butterfly valve is open; a downstream butterfly valve configured to allow a user to control the water flow stream through the housing; a downstream indicator post, wherein the downstream indicator post:
is substantially parallel to the water flow if the downstream butterfly valve is closed; andis substantially perpendicular to the water flow if the downstream butterfly valve is open; and a pair of check modules located between the upstream butterfly valve and downstream butterfly valve.