Discharge valves are manufactured of PFA/Boro 3.3/ceramic components. The Dispensette® S discharge valve has a platinum-iridium valve spring; the Dispensette® S Organic discharge valve has a tantalum valve spring.

Discharge valves for the Dispensette® S Trace Analysis are available with either a platinum-iridium or tantalum valve spring for specific applications (e.g., Pt-Ir valve for dispensing HF).