Medical equipment moves liquids and gases for very different purposes: infusion delivery, respiratory control, anesthesia gas handling, analyzer sampling, sterilizer utilities, dialysis, suction, cooling, and waste. The pump or valve must be understood within its complete pressure, flow, material, sensing, and control environment.

Key takeaways

  • Pump type determines how motion creates flow and which wear parts matter.
  • Valve porting, normal state, flow direction, pressure rating, materials, and coil or drive requirements define compatibility.
  • Tubing, fittings, manifolds, filters, seals, and sensors can create the same symptom as a failed pump or valve.

01

Common pump families

Peristaltic pumps compress tubing and isolate the fluid from the mechanism. Diaphragm pumps use flexible membranes and check valves. Piston and syringe pumps displace a defined volume. Rotary-vane, scroll, turbine, and other designs serve vacuum or gas movement. Drive motors, bearings, heads, tubing, seals, valves, and controllers form the working assembly.

02

Solenoid and proportional valves

A solenoid valve commonly changes between defined states, while a proportional valve regulates opening in response to a command. Two-way, three-way, pinch, pilot-operated, check, relief, and isolation valves have different functions. Normally open versus normally closed behavior is a safety and control distinction, not a wiring detail.

03

The surrounding fluid path

Manifolds, tubing, fittings, filters, traps, reservoirs, restrictors, dampers, seals, and vents determine how pressure and flow reach the load. Material compatibility with oxygen, steam, disinfectant, reagents, dialysate, blood-contact circuits, or cooling fluids can be critical.

04

A useful identification record

Capture fluid or gas, function, direction, pressure and flow range, vacuum level, temperature, materials, tubing size, port geometry, valve normal state, coil voltage, current, drive waveform, pump displacement, motor feedback, connector, part number, revision, and cleaning requirements. Functional testing must evaluate the installed system, not only bench motion.

Safety boundary

Fluidic assemblies may handle oxygen, blood, infectious waste, steam, chemicals, vacuum, or pressurized gas. Qualified personnel must isolate hazards and use materials, procedures, and tests approved for the exact equipment.

Related terminology

Terms with a published definition link directly to the glossary.

peristaltic pumpdiaphragm pumpsolenoid valveproportional valvemanifoldfluidics