Watts 3/4 by 3/4 inch dual check valve controls the reverse flow of contaminated water from entering the drinking water supply. It is manufactured for non-health hazard water system containment and constant pressure applications.
Features:
- Watts 3/4 LF7 U2-2 dual check valve can be installed vertically or horizontally in piping applications having a broad range of copper setters, meter horns & boxes.
- This dual check valve features lead-free cast-copper silicon alloy construction for improved strength & minimised brittleness and has Buna-N seat material for abrasion resistance.
- This FNPT-connection type unit comes equipped with two plastic check valves that are easily replaceable and a steel spring for hazard water system containment in constant pressure applications.
Standards and Approvals:
Frequently Asked Questions:
Q. What is the maximum working pressure of this Watts 3/4 LF7 U2-2 dual check valve?
A. The valve operates under pressures ranging from 10 to 150 psi under temperatures up to 180 degrees F.
Q. What are the benefits of double-check valves?
A.
- The other check valve takes over if the first check valve becomes stuck open.
- Closed check valves provide tighter seals and prevent even small leaks by lowering the pressure differential across the other valve.
Q. What are the points to remember while installing these valves?
A.
- They should be installed downstream of the water meter & the water pressure regulator.
- They should always be installed in an accessible location for easy servicing and testing.
- Pipe lines should be thoroughly flushed to remove foreign material before installing the unit.
- Protect from freezing and ensure that the valve is installed in the proper flow direction.
- Refer to the flow direction arrow on the valve nameplate or body.
- When installing a valve in the pipeline, only use wrenching flats.
- These valves incorporate an O-ring union seal that requires minimum tightening of the union nut, therefore do not over-tighten.
- These valves contain plastic check modules and should never be directly soldered into the line.
