Chemical metering pumps shall be positive displacement, Liquifram™ type pumps that are UL and CUL approved.
Series C9 metering pumps shall have a clear liquid crystal display. Control shall be selectable between internal and external pulsing by means of a tactile keypad. Internal stroke frequency shall be adjustable from 1 stroke per hour to 100 strokes per minute. Pressure capacity shall be keypad adjustable to reduce noise, vibration and wear. Metering pump shall be capable of dividing or multiplying pulse inputs from 1 to 999 or responding directly or inversely to a 4-20mA input signal.
Drive
The pump drive shall be totally enclosed with no exposed moving parts. Solid state electronic pulser shall be encapsulated and supplied with quick connect terminals at least 3/16" (4.75 mm) wide. Electronics shall be housed in chemical resistant enclosure at the rear of the pump for maximum protection against chemical spillage.
Automatic Pressure Relief
To eliminate need for pressure relief valve, LiquiframTM shall automatically stop pulsating when discharge pressure exceeds pumppressure rating by not more than 35%.
Material
Chemical metering pump housing shall be of chemically resistant glass fiber reinforced thermoplastic with a glass fiber reinforced polypropylene EPU carrier1 . All exposed fasteners shall be stainless steel. Chemical metering pump valves shall be ball type, with ceramic balls2 . Valve seat and seal ring shall be renewable by replacing the combination seat-seal ring3 or cartridge valve assembly. Pump head shall be of transparent acrylic4 material capable of resisting the pumped chemical. Fittings and connections at pump head shall be PVC5.
Check Valves And Tubing
A total of 16 ft (4.8 m) of polyethylene tubing6 shall be provided per pump complete with compression connections. A foot valve with integral one piece strainer shall be provided for the suction line, and an injection check/back pressure valve with 1/2" NPT male connection for the injection point. The injection check valve shall incorporate a dilating orifice which prohibits scale formation and accumulation of crystal line deposits.
