Double Check Detector Assemblies are designed to prevent backflow of non-health hazard substances from being pumped or siphoned into the potable water supply. Certain models have a meter to detect ground leaks and unauthorized illegal taps. Available in multiple configurations and material construction. Have a question or two?

Series 757DCDA, 757NDCDA Double Check Detector Assemblies prevent the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. Compact housings consist of two independently operating tri-link check valves, two shutoff valves, and four test cocks.

Series 774DCDA Double Check Detector Assembly Backflow Preventers are designed to prevent the backflow of fire protection system substances from being pumped or siphoned into the potable water supply. They have a compact construction and short lay length, ideal for retrofit installations.

These Wilkins 350 Series double check valve assemblies, manufactured by Zurn, are designed for installation on water lines to protect against both back-siphonage and back-pressure of polluted water into the water supply.

2020年10月21日 · ddcva size* 6" - 10" 12" vault no 577-la 687-la 5106-la p r i vat e 0.1. spool (rj) concrete vault w/ ladder & bilco style lid (see approved materials list) ... install alarm system & fdc as required by fire authority. waterproof pipe entry through vault walls w/krypton mortar sealant or approved equal.

This article discusses underground and above-ground installations of a double-check valve assembly. Before installation, run the main irrigation supply line from the isolation valve to the vicinity of the DCVA valve box. Temporarily seal the end of the pipe to keep out soil and debris.

HERSEY DDC 11 SIZE 3", 4", 6", 8", 10 DESCRIPTION This is a double check detector assembly. Production was begun approximately in 1975 and was discontinued in 2004. It utilizes an assembly similar to the Hersey model 2 for the main unit. The model FDC 3/4" is …

Its compact epoxy coated cast iron unibody and modular check design facilitate simple and easy installation and maintenance. Maximum Working Pressure: 175psi (12.06 bar). "Do not use this item for any installation or repair of potable water applications.

DDCVA INSIDE BUILDING ONLY BY APPROVAL OF DISTRICT ENGINEER. DDCVA SHALL BE ON THE WADOH APPROVED LIST INSTALL VALVE MARKER POST (SEE STANDARD DETAIL). INSTALL ALARM SYSTEM & FDC AS REQUIRED BY FIRE AUTHORITY. WATERPROOF PIPE ENTRY THROUGH WALLS WITH KRYPTON MORTAR SEALANT OR APPROVED EQUAL SEE APPROVED MATERIALS LIST.

The Fire Department Connection (FDC) is a specific type of connection point installed on a building or freestanding in a vault structure to provide a link between the building’s fire protection system and the fire department’s water supply.