Haskel Model GSF-35 — 6 HP Air-Driven Liquid Pump

Haskel Model GSF-35 — 6 HP Air-Driven Liquid Pump

The Haskel Model GSF-35 is a high-capacity, air-driven liquid pump engineered for demanding industrial applications requiring reliable hydraulic pressure generation. Equipped with a nominal pressure ratio of 35:1 and a single air head configuration, the GSF-35 delivers consistent fluid pressures up to 4375 PSIG, making it an excellent choice for high-flow, moderate-to-high pressure applications.

This pump incorporates Haskel’s proven pneumatic drive technology, providing safe, spark-free operation without heat generation—making it ideal for hazardous or electrically sensitive environments. With infinitely adjustable cycling speed and the ability to stall at a preset pressure without consuming additional air or power, the unit offers exceptional control, energy efficiency, and operational flexibility.

Designed to support automation, the GSF-35 integrates easily with process control systems, while requiring minimal maintenance due to its rugged construction and lubrication-free air drive. The pump’s stainless-steel and bronze components ensure superior durability and corrosion resistance, even in harsh service conditions. Optional ATEX, CE, and NACE certifications further enhance suitability for offshore, chemical, oil & gas, and demanding industrial environments.

Technical Specifications

Performance

• Power Rating: 6 HP

• Air Head Configuration: Single

• Nominal Pressure Ratio: 35:1

• Actual Area Ratio: 40.3:1

• Maximum Air Supply Pressure: 125 PSIG

• Maximum Outlet Pressure (Continuous/Intermittent): 4375 PSIG

• Maximum Cycling Rate: 60 cycles/min

• Displacement per Cycle: 6.00 cu. in.

• Maximum Flow: 1890 cu. in./min

Typical Performance @ 100 PSIG Air Supply

• 1770 in³/min at 1000 PSIG

• 600 in³/min at 3500 PSIG

Construction Materials

• Pump Section: Stainless steel & bronze

• Plunger: Hard chrome-plated 15-5 PH stainless steel

• Non-Metallic Components: UHMWPE, Viton, PTFE, Ryton

Operational Features

• Safe pneumatic operation with no heat, flame, or spark hazard

• Infinitely variable cycling speed for precise flow and pressure control

• Stalls at the desired pressure without consuming power

• Reliable stop/start performance

• Easily integrated into automated systems

• Suitable for a wide range of liquids and liquefied gases

• Alternative drive gases: sour gas, natural gas, nitrogen, boil-off gases

• Proven, robust, and maintenance-friendly design

• No air-line lubrication required—reduces cost and contamination

• Unbalanced cycling spool for quick response to pressure changes

• Optional certification to ATEX, CE, and NACE standards

Application Compatibility (Service Codes)

• Service Code 1: Petroleum-based oils, kerosene, ethylene glycol, water with 5% soluble oil

• Service Code 2: Plain water, diesel fuel

• Service Codes 3–6: Not Recommended (N/R)