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> Watts 9D 3/4" backflow preventer 9DM2 vented
Watts 9D 3/4" backflow preventer 9DM2 vented
3/4" Dual Check Valve with Intermediate Atmospheric Vent
Series 9D is specially made for smaller supply lines and ideally suited for laboratory equipment, processing tanks, sterilizers, dairy equipment and similar applications. It is particularly recommended for boiler feed lines to prevent backflow when supply pressure falls below system pressure. Series 9D is suitable for use on hot or cold water and can be used under continuous pressure. It features a primary check valve utilizing a rubber disc seating against a mating rubber part to ensure tight closing. A secondary check valve utilizes a rubber disc-to-metal seating. In the event of fouling of the downstream check valve, leakage would be vented to atmosphere through the vent port thereby safeguarding the potable water system. Construction is brass body with stainless steel working parts, integral strainer and durable rubber discs. Female union inlet and outlet connections.
1 2" (13mm) thread connection.
True line-sized construction allows the check modules to open further allowing dirt and debris to pass more freely reducing check fouling
Stainless steel internal parts
Maximum flow at low pressure drop
Furnished with union connections to facilitate removal and replacement for maintenance
Compact for economy combined with performance
Design simplicity for easy maintenance
Can be installed vertically or horizontally
For Backflow Preventers with Atmospheric vents
A Dual Check Valve with Atmospheric Vent shall be installed at referenced cross-connections. Valve shall feature stainless steel and rubber internals protected by an integral strainer. Primary check shall be rubber to rubber seated, backed by the secondary check with rubber to metal seating. The device shall be ASSE approved under Std. 1012 and shall be a Watts Regulator Company Series 9D.
