Product/Service

Series 774 Double Check Valve Backflow Preventer

Series 774 Double Check Valve Backflow Preventer is designed to pre-vent the reverse flow of polluted water from entering into the potable water system.
Series 774 Double Check Valve Backflow Preventer is designed to pre-vent the reverse flow of polluted water from entering into the potable water system. This series can be applied, where approved by the local authority having jurisdiction, on non-health hazard installations. Fea-tures the shortest end-to-end dimensions in the industry, light weight stainless steel body, and the lowest head loss available.

FEATURES

  • Patented torsion spring check valve provides low head loss
  • Short lay length is ideally suited for retrofit installations
  • Stainless Steel body is half the weight of competitive
    designs reducing installation and shipping cost
  • Stainless steel construction provides long term corrosion
    protection and maximum strength
  • Single top access cover with two-bolt grooved style
    coupling for ease of maintenance
  • Thermoplastic and stainless steel check valves for
    trouble-free operation
  • No special tools required for servicing
  • Compact construction allows for smaller vaults and
    enclosures
  • May be installed in horizontal or vertical "flow up"

    AVAILABLE MODELS
    Suffix:
    NRS - with non-rising stem resilient seated gate valves
    OSY - with UL/FM resilient seated outside stem & yoke gate valves
    LF - without shutoff valves
    S - with strainer

    SPECIFICATIONS
    A double check valve backflow preventer shall be installed at each noted location to prevent the unwanted reversal of polluted water into the potable water supply. The main valve body shall be manufactured from 300 series stainless steel to provide corrosion resistance. The check valves shall be of thermoplastic construction with stainless steel hinge pins, cam arm, and cam bearing. The check valves shall utilize a single torsion spring design to minimize pressure drop through the assembly. The check valves shall be modular and shall seal to the main valve body by the use of an o-ring. There shall be no brass or bronze parts used within the check valve assembly. The valve cover shall be held in place through the use of a single grooved style two-bolt coupling. The main assembly shall consist of two inde-pendently operating torsion spring check assemblies, two resilient seated isolation valves, and four ball valve type test cocks. The as-sembly shall be a Watts Regulator Series 774.

    Watts Regulator Company, 815 Chestnut St., N. Andover, MA 01845. Tel: 978-688-1811; Fax: 978-689-6247.