SKU: DSF-25-29376
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Haskel Model DSF-25 1.5HP Air-Driven Liquid Pump

Catalog literature: Liquid Pump Catalog.pdf Acrobat DC

With a nominal pressure ratio of 25:1, the Haskel model DSF-25 1.5HP air-driven liquid pump utilizes a single air head to boost liquid pressures to a maximum of 4000 PSIG.

Features & Benefits:

  • Safe pneumatic operation – no heat, flame or spark risk
  • Infinitely variable cycling speed
  • Stall at pre-determined pressure to hold that pressure without consuming power
  • Problem-free stop/start applications
  • Easily automated – many modification and control options
  • Suitable for most liquids and liquefied gases
  • Alternative gas drive options available, such as sour gas, natural gas, boil off gases, or nitrogen
  • Robust, reliable, compact and easy to maintain proven design
  • No need for air line lubrication – saves costs and prevents contamination
  • Unbalanced cycling spool provides immediate response to pressure changes
  • Can be manufactured to ATEX, CE and NACE

Technical Data:

  • Power: 1.5HP
  • Air Head: single
  • Max Air Pressure: 150 PSIG
  • Max cycles: 80/min.
  • Nominal ratio (“dash number”): 25:1
  • Actual area ratio: 29:1
  • Max outlet pressure (continuous): 4000 PSIG
  • Max outlet pressure (intermittent): 4000 PSIG
  • Displacement / cycle: 1.62 cu. in.
  • Max flow: 486 cu. in./min.

Typical Performance Characteristics (@100 PSIG air supply pressure):

  • 403 in3/min @ 1000 psig
  • 195 in3/min @ 2500 psig

Materials of Construction:

  • Pump section: Separation – All SS
  • Plunger: 440C SS hard-chrome plated
  • Non-metallics: UHMWPE, Viton, PTFE, Ryton


  • Service Code 1: Petroleum-based oils, kerosene, ethylene glycol, water with 5% soluble oil.
  • Service Code 2: Plain water, diesel fuel
  • Service Code 3: Most phosphate ester-based fire-resistant hydraulic fluids (e.g. Pydraul, Lindol, Cellulube, Fyrquel and Houghtosafe 1120) and petroleum-based solvents compatible with UHMWPE (Ultra-high Molecular Weight Polyethylene) dynamic seals and Viton static seals.
  • Service Code 4: N/R
  • Service Code 5: Skydrol and Aerosafe hydraulic fluid; acetone and some alcohols (ethyl, methyl, and isopropyl).
  • Service Code 6: De-ionized water; demineralized water


Repair kit information:

  • Fluid section seal kit P/N: 51533-25
  • Air drive seal kit P/N: 16772
  • Air valve seal kit P/N: 16771
  • Distance piece seal kit P/N: 17327
  • Optional tools: 28584 (Sleeve removal tool); 53220-25 (Seal insertion tool, “F” seal); 29370 (for installing ring on 1/2″ check valve); T-17386-25 S (to align distance piece spacer with piston rod)
  • Notes: Seal installation tool is included in fluid section kit.
  • Installation documents: SKIS-001  SKIS-002

Product documents available for download:
performancecurve (3).pdf
27408 (1).pdf

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