Shutoff valve in backflow prevention device with visual indicator

A backflow prevention device, configured such that the flow stream is oriented approximately horizontally, 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;
• and
• an outlet configured to connect to 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 approximately horizontal when the upstream butterfly valve is closed;
• and
• is approximately vertical when 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 oriented approximately horizontal when the downstream butterfly valve is closed;
• and
• is oriented approximately vertical when the downstream butterfly valve is open;
• and
• a pair of check modules located between the upstream butterfly valve and downstream butterfly valve.

A backflow prevention device, configured such that the flow stream is oriented approximately horizontally, the backflow prevention device comprising:

• a housing defining a water flow stream, wherein the housing includes:
• an inlet connected to a water supply;
• and
• an outlet connected to system that uses water;
• an upstream butterfly valve, wherein the upstream butterfly valve:
• is configured to allow a user to control the water flow stream through the housing;
• and
• includes a disk, wherein the disk:
• is configured to:
• prevent water flow at a first position;
• allow water flow at a second position;
• and
• rotate about an axis of rotation between the first position and the second position;
• and
• includes:
• a seal, wherein the seal is configured to sealingly engage
• a sealing surface in the housing at the first position;
• and
• an upstream indicator post, wherein the upstream indicator post:
• is approximately horizontal when the upstream butterfly valve is closed;
• and
• is approximately vertical when the upstream butterfly valve is open;
• a downstream butterfly valve, wherein the downstream butterfly valve:
• is configured to allow a user to control the water flow stream through the housing;
• and
• includes a disk, wherein the disk:
• is configured to:
• prevent water flow at a first position;
• allow water flow at a second position;
• and
• rotate about an axis of rotation between the first position and the second position;
• and
• includes:
• a seal, wherein the seal is configured to sealingly engage
• a sealing surface in the housing at the first position;
• and
• a downstream indicator post, wherein the downstream indicator post:
• is approximately horizontal when the downstream butterfly valve is closed;
• and
• is approximately vertical when the downstream butterfly valve is open;
• an access port in the housing configured to provide a user with access to the upstream butterfly valve disk and the downstream butterfly valve disk;
• and
• a pair of check modules located between the upstream butterfly valve and downstream butterfly valve.