Piston and cylinder sets
Matched ceramic pistons and cylinders honed and lapped as pairs; sets are kept and labelled together for assembly.
Product family
Ceramic dosing and filling pump parts
Matched zirconia, alumina, and silicon nitride piston-and-cylinder sets, rotary valve cores, and pump blanks for dosing systems where volume repeatability depends on clearance and finish.
Product overview
What we make and how it is reviewed
Ceramic dosing pumps meter a fixed volume per stroke with a ceramic piston running in a ceramic cylinder, often without elastomer seals. Volume repeatability depends on the piston-to-cylinder clearance, the roundness and straightness of both parts, and the finish of the running surfaces, so these parts are usually ground, honed, and matched as a set.
Typical requests include piston and cylinder sets for lithium-battery electrolyte filling machines, food and beverage filling pumps, dialysis and medical fluid pumps, laboratory metering pumps, rotary or diverter valve cores, pump stems, and pre-sintered pump blanks for customers who finish in-house.
Before quotation we need the volume per stroke, medium, cycle rate, and the clearance or leakage target. Electrolyte, food, and medical service add cleaning, contamination, and documentation requirements that must be agreed early.
Product types
Part types we quote to drawing
These are made to customer drawings or samples, not sold from stock. Final material, route, and acceptance are confirmed for each drawing.
Electrolyte filling pump parts
Pump cores, pistons, and valve parts for battery electrolyte filling where corrosion, particles, and dryness matter.
Food and beverage filling parts
Filling pistons, valve cores, and nozzles where hygiene, cleaning, and food-contact records apply.
Medical and laboratory pump parts
Dialysis, analyzer, and laboratory pump pistons and valve elements made from zirconia or high-purity alumina.
Rotary and diverter valve cores
Ceramic rotors, valve plates, and ports that switch flow; sealing faces are lapped and port edges protected.
Pump blanks and stems
Sintered blanks, stems, and rods supplied with grinding allowance for customers who finish or assemble in-house.
Decision map
Requirements that change machining and quotation
Use the final column as a drawing and RFQ check. A requirement is easier to review when its function and acceptance evidence are stated together.
| Requirement | Why it changes the route | What to define in the RFQ |
|---|---|---|
| Clearance between piston and cylinder | Clearance sets leakage and dosing repeatability; it is controlled by matching parts rather than by loose individual tolerances. | State the target clearance or leakage, whether sets are matched, and how sets are identified. |
| Bore roundness, straightness, and finish | The cylinder bore is honed or lapped; taper or bell-mouth changes the volume along the stroke. | Define bore size, cylindricity or roundness, straightness, Ra, and the measurement method. |
| Dose volume and stroke | Volume and stroke set the piston diameter and running length that must be precision-finished. | Give volume per stroke, stroke length, cycle rate, and acceptable volume variation. |
| Medium and contamination | Electrolyte, food, and medical fluids need grade, cleaning, and particle control decided before quotation. | Name the medium, cleaning and packaging rules, and any material or contamination declarations. |
| Ports, grooves, and valve faces | Port edges and lapped valve faces are fragile and often decide both leakage and chipping. | Mark sealing faces, flatness, port edge condition, and permitted chips on the drawing. |
| Assembly and test responsibility | A pump set may pass dimensional checks yet fail a volume or leak test in the machine. | Agree whether parts are supplied loose, as matched sets, or assembled, and who runs functional tests. |
Material paths
Select against the failure mode
Zirconia (Y-TZP) pistons
Tough, fine-finishing material often used for the moving piston; check compatibility with the medium and temperature.
Alumina cylinders and valve parts
High-purity alumina offers hardness and chemical stability for cylinders, valve plates, and ports.
Silicon nitride
Used in some electrolyte and chemical dosing pumps where its wear and chemical behaviour suit the medium; grade data is project-specific.
Matched material pairs
Piston and cylinder may use the same or different ceramics; the pairing affects wear, galling risk, and thermal clearance change.
Quote-ready package
Information to send for review
- 1 Drawings for piston, cylinder, and valve parts, or the pump model and samples.
- 2 Volume per stroke, stroke length, cycle rate, and repeatability target.
- 3 Pumped medium, temperature, and cleaning or contamination requirements.
- 4 Clearance or leakage target and whether parts must be matched sets.
- 5 Bore and OD geometry, Ra, and inspection method for running surfaces.
- 6 Quantity of sets, spare parts plan, and target timing.
Engineering guides
Continue by component, material, or acceptance problem
Each guide below narrows one part family or manufacturing constraint and leads back to the drawing information needed for review.
Precision Ceramic Pump and Valve Components for Corrosive Fluid Control
Design and RFQ guide for ceramic pump and valve components used in corrosive, abrasive, high-purity, and vacuum fluid systems, including SiC seal faces, zirconia balls, alumina seats, plungers, sleeves, lapping, and inspection.
Ceramic Fluid-Path Components for Analytical Instruments
RFQ guide for ceramic needles, plungers, valve parts, flow cells, and micro-nozzles where carryover, dead volume, media, sealing, cleaning, and inspection must be defined.
Ceramic Thin-Wall Sleeve Machining RFQ Guide: Bore Concentricity, Wall Thickness, Roundness
How to prepare an RFQ for thin-wall ceramic sleeves, bushings, insulating tubes, precision bores, wall-thickness control, roundness, concentricity, and inspection.
Ceramic Lapped Seal Faces RFQ Guide: Flatness, Ra, Leak Risk
RFQ guide for lapped ceramic seal faces, valve seats, vacuum interfaces, gasket lands, flatness, Ra, edge condition, subsurface damage, and leak-test expectations.
Questions before quotation
Product RFQ FAQ
Do ceramic dosing pumps need seals?
Many ceramic piston pumps rely on a small, controlled clearance instead of elastomer seals. That only works when the piston and cylinder are finished and matched together, so the clearance target must be part of the RFQ.
Can you replace parts in an existing filling machine?
Yes, replacement parts can be reviewed from drawings or samples. Send the pump model, dose volume, and medium; dimensions, material, and fit are confirmed before quotation.
Can parts be supplied for electrolyte filling?
Electrolyte filling pumps can be reviewed. Material choice, cleaning, drying, and packaging must match the electrolyte and plant requirements and are agreed per project.
Engineering RFQ
Send your drawing and ceramic requirements for engineering review
Start with the part function, material or grade if known, quantity, and the critical requirements; an early-stage brief is enough to begin. If online submission is interrupted, the form prepares the same RFQ as an email instead.
- Useful files: STEP/STP, X_T/X_B, IGES, STL, or PDF drawings.
- Upload limit: up to 3 files, 5 MB each, 8 MB total.
- Sensitive projects: do not send export-controlled, classified, or restricted data before an approved handling agreement is in place.
Prefer to use your own email?
RFQ email: info@szcomo.com
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