PSG Biotech Products

From Laboratory to Commercial Scale

Best-in-class pump, flow control and flow-measurement solutions that safely transfer and precisely meter the most delicate of biologics, medicines and therapeutics, all while increasing yield, throughput and speed to market.

View Our Products

Coriolis Flow Meters

View All

Ultrasonic Sensors

View All

Flow Control Valves

View All

Quattroflow Markets

Ideal solutions for critical applications

Quattroflow® develops and manufactures quaternary (four-piston) diaphragm pumps specifically designed for critical applications in the biopharma industry.

View Our Markets

Spare Part Kits

Quattroflow® pumps are primarily maintenance-free thanks to their robust construction. However, the diaphragms, valves and O-rings should be checked regularly and, if needed, should be replaced using the Spare Parts Kit: "Diaphragms-Valves-O-Rings." We recommend a maintenance interval of 1,000 hours of operation or at least once a year. Depending on the operation conditions (pressure, temperature, flow rate, SIP, etc.), it may be necessary to significantly shorten the maintenance interval for the elastomers. 

The following parts are included in the Spare Parts Kit: “Diaphragms-Valves-O-Rings” (the quantity depends on the pump size):

  • Diaphragms
  • Inlet valves
  • Outlet valves
  • O-ring kit


For corrosion reasons or a clearly audible operating noise, the parts in the Spare Parts Kit: “Shaft-Bearing-Cap-Unit” should also be replaced. The kit consists of the following parts:

  • Eccentric shaft
  • Bearings
  • Bearing holder
  • Bearing cap


To receive a quotation for your respective spare parts kit, please provide your pump code to