1.0 RECIRCULATING LABORATORY FAUCET
1. Recirculating Laboratory Faucet shall be constructed of polyvinylidene flouride (PVDF) or natural
polypropylene (PPN) and designed to provide a continual fluid flow to the point of use to eliminate
the inherent dead leg. Faucet shall be Marquest Scientific model DL-DDR-2 (Natural Polypropylene)
or DL-DDR-3 (Natural PVDF).
2. Faucet to be manufactured with Duraline Control Valve for on/off flow operation and precise control,
featuring an encapsulated PTFE shut off seal for constant on/off use and a compression PTFE stem seal.
A renewable cartridge shall be available for the valve which provides an easy method of replacing all
valve moving parts while the faucet is in its installed position.
3. Recirculating laboratory faucets when installed in a series require a small pressure drop to be created
between the main loop supply connection and the recirculating return line connection. This may be
accomplished with a common, diverter type tee fitting, a valve or an orifice plate.
4. Pressure rating shall be 120 PSI.
2.0 INSTALLATION
1. System components for installation shall be of like materials of construction. Joining techniques
shall confirm to best practice given the application and specifications.
