Graco Inc.

Merkur Bellows Piston Pumps  Plunger Bellow Seals Piston Pumps

Improved bellows seal design eliminates throat seal leakage and lubrication

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Graco’s bellows pumps provide low maintenance with no seals exposed to the atmosphere. These pumps are designed to eliminate conventional throat seals, providing high reliability for moisture-sensitive materials.

  • Highest technology air motor on the market
  • Low air consumption for increased efficiency
  • Simple air motor design and minimal parts reduces repair time
  • Easy-to-flush design allows for fast color changes and reduced material waste
  • 300 series stainless steel pump construction provides long-lasting durability
  • Fewer parts and online replacement bellows seal means improved serviceability, lower cost of ownership and reduced downtime

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Merkur Bellows Pump
Maximum fluid inlet pressure
15 psi
1.0 bar, 0.1 MPa
Maximum fluid temperature
160°F
71°F
Ambient temperature range
35° to 120°F
2° to 49°F
Stroke length
2.5 in
64 mm
Wetted parts
PEEK, PTFE, stainless steel, tungsten carbide, UHMWPE
PEEK, PTFE, stainless steel, tungsten carbide, UHMWPE
Maximum Fluid Working Pressure
Models LB050A and LB050B
4500 psi
310 bar, 33.1 MPa
Models LB100A and LB100B
3600 psi
248 bar, 24.8 MPa
Models LB150A and LB150B
2400 psi
165 bar, 16.5 MPa