303046 Piston Cup Kit; 6.00 Inch, Series B
Part 303046 is a 6.00 inch Series B piston cup kit for the fluid end of a reciprocating pump. The piston cup is the flexible sealing element that seals against the cylinder liner bore as the piston reciprocates, so it is a routine wear item. It fits the W-446 pump and is supplied as an aftermarket replacement for part number 303046, matching the original part's form and fit. The kit weighs about 3.10 lb.
What it is
A piston cup is the flexible sealing element fitted to the piston in the fluid end. It maintains the seal against the cylinder liner bore as the piston reciprocates, so wear here directly affects volumetric efficiency.
Pump compatibility
Specifications
| Property | Value |
|---|---|
| Weight | 3.10 lb (≈ 1.41 kg, converted) |
| Width | 6.50 in / 16.5 cm |
| Height | 3.50 in / 8.9 cm |
| Depth | 6.50 in / 16.5 cm |
Manufacturer technical notes
303046 Piston Cup Kit (6.00", Series B), forged from ASTM A350 LF2 carbon steel (yield strength ≥250MPa), quenched+tempered (HRC 28-32) with polyurethane surface coating (≥0.5mm thickness), API 7K Triplex mud pump compliant, sealing pressure ≥30MPa, ISO 15154-E extrusion rating, direct replacement for National 1090-6219K upgrade.
Verbatim from the Dongli product page on dlhddrilling.com.
Replacement / interchange
Aftermarket replacement cross-referencing 303046.
FAQ
- Which pump does piston cup kit 303046 fit?
- It fits the W-446 pump, in the 6.00 inch Series B size.
- What does the piston cup do?
- It is the flexible seal on the piston that seals against the cylinder liner bore as the piston reciprocates; wear here affects volumetric efficiency, so it is a routine replacement part.
- What part number does this replace?
- It is an aftermarket replacement for part number 303046, supplied to match the original part's form and fit.
Related parts
All brand names, model numbers and part numbers are used for identification and cross-reference only and do not imply original-equipment manufacture. This is an aftermarket replacement part.
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