| 摘要 |
<p>Backflow prevention is provided in connection with a device having one or mo re shut-off valves (414a, 414b) integrated with backflow preventer check valves (412a, 412b), and housing (114). No flange or other connection between shut-off valves and backflow preventer check valves is required, reducing size, weight and labor requirements. The system can substantially reduce or eliminate potential for installation of double-check-valve backflow preventer devices without shut-off valves.</p> |
