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Pumps, Seals & Fluid-Transfer Hardware

Pump sourcing decisions are head/flow curve, motor grade and seal type; two pumps with the same nameplate kW can differ widely on actual duty point, winding copper content and duty rating (S1 vs S2). Sealing hardware (O-rings, gaskets, mechanical seals) is priced on compound, not size — FKM, NBR, EPDM and silicone behave very differently in the same drawing.

Industrial belt

Wenling / Taizhou (Zhejiang) for small pumps and pump assemblies; Feidong (Anhui) for engineering pumps; Ningbo / Cixi for seals, hoses and general-flow hardware

Typical products

Centrifugal / multistage pumpSubmersible drainage & sewage pumpGear / diaphragm pumpMechanical seal cartridgeO-ring & gasket setsSolenoid & micro pump

Materials

Cast iron HT250Brass / bronzeSS 304 / 316 wetted partsNBR / FKM / EPDM / silicone / PTFE

Surface finishes

Epoxy paintedElectro-depositedStainless passivated

Standards you will quote against

ISO 9906 (pump test code Grade 2/3)EN 12162 (brass)IEC 60034 motor class, IP ratingFDA / WRAS material compliance only if certified

Specification reference

Attribute	What to specify
Duty	Head 5–80 m, flow 1–40 m³/h typical for small pumps
Motor	Copper winding declared, IP44/IP55/IP68, Class F insulation, S1 duty
Seal type	Mechanical seal (carbon/ceramic/NBR) vs packed gland
Elastomer	NBR oil, FKM fuel/high-temp, EPDM steam/water, silicone food-grade
Test	Performance curve per model; leak/insulation test per unit
Power	0.37–7.5 kW common; single/three-phase declared per destination grid

Typical MOQ: 50–200 pcs for OEM-labelled pumps; seals typically 1,000–5,000 pcs per size; moulded rubber 3,000 pcs (tooling applies). Typical lead time: 30–45 days for pumps incl. motor sourcing.

Factories listed in this category

No factory page is published in this category yet. The specification table above is already usable for quotation; factory pages are added under this category URL as they are onboarded.

Questions buyers ask

What should a pump purchase order pin down to avoid disputes?

The duty point (head and flow together), motor winding material, insulation class, IP rating, duty rating S1/S2, wetted-part alloy, seal type, and the test standard (ISO 9906 grade). Those six items are where cheap pumps usually differ while still matching the catalogue.

Which rubber should my seals be for hot water or fuel?

NBR suits oils and fuels but not hot water; EPDM suits hot water, steam and glycol but fails in oil and fuel; FKM covers fuels and higher temperatures at higher cost. Choosing by medium rather than by durometer is the single most common fix in seal claims.