Doxa Series

manufactured according to API 675 Std; “non lost motion” construction
continuous adjustment of plunger stroke length, i.e. of capacity from 0 to 100% while the pump is at rest or running
plunger stroke length adjustable from 0 to 25 mm, or also from 0 to 12 mm for low capacity diaphragm pumps
plunger speed from 25 up to 140 strokes/min.
metering accuracy better than 1% within the normal operating range of 10÷100% of capacity
maximum liquid temperature for continuous operation:
- 250°C with metal pump heads
- 150°C with PTFE diaphragms
- 80°C÷100°C with ceramic plunger
- 50°C with PVC or 70°C with polypropylene pump heads

NSPH required, less than 0.3 kg/cm² abs. at normal operating conditions, for plunger pumps
groupable in multiplex units, also with pumps of different series
patented capacity adjustment system, single and double circular type, with mechanical plunger return stroke
crankcase made of cast iron and completely enclosed, with oil splash lubrication
stuffing box with lantern ring for flushing or greasing; standard packing rings with V section or square section, made of PTFE, neoprene or impregnated fibers

two series available:
- DOXA.L, max. allowable thrust: 2000 N (design 2500 N)
- DOXA.M, max. allowable thrust: 7000 N (design 9000 N)
pump body made of metal or plastic materials
heating jacket or cooling jacket as optional; special execution with integral heating jacket for high heating efficiency
diaphragms operated through hydraulic circuit with feed and relief valves
metal or plastic pump body, with heating or cooling jacket on request

PTFE or metal diaphragms, always double to avoid leakage due to single diaphragm rupture
alarm device, as option, for diaphragms rupture
special feature with remote head for dangerous, contaminated or very high temperature liquids

three types of diaphragm pumping heads are available:
- type DD with double diaphragm, for DOXA.M series only, with intermediate oil-filled chamber, mainly used for medium-high capacity
- type DS with double diaphragm sandwich type, i.e. with an oil film or, for particular cases, vacuum between the diaphragms
- type MM with metallic double diaphragm, sandwich type, mainly used for small capacity and high pressure or temperature
three phase, four poles, flanged type electric motors, B5 or V1 shape
manual control, with pump at rest or in operation, by handwheel with lock knob; linear adjustment scale with precision vernier
automatic control by means of a pneumatic positioner
automatic control with positioner controlled by an electrically actuated monophase servomotor
electric pulses generator and pulsemeter to meter a fixed liquid quantity