Watts 9D Vented Dual Check Valve

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.

• 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