Air-Driven Liquid Pumps

Pneumatically driven positive-displacement pumps for controlled liquid pressurisation, transfer, testing, injection and hydraulic actuation.

Request a Quote ↗

Representative air-driven liquid pump package with pneumatic drive, hydraulic section and pressure controls — Representative configuration; final arrangement is supplier- and duty-dependent.

TECHNICAL OVERVIEW

Purpose and operating principle

Air-driven liquid pumps convert relatively low-pressure compressed air into higher hydraulic pressure through a differential-piston arrangement. They are compact, controllable pressure sources for upstream work where electrical drive is unavailable or undesirable. The selected pump ratio, displacement, seals and wetted materials must match the required outlet pressure, flow, fluid and duty cycle.

How it works

Drive air reciprocates a large-area air piston connected to a smaller hydraulic plunger. Inlet and outlet check valves direct liquid through the hydraulic section. The pump cycles rapidly while filling, slows as outlet resistance rises, and stalls when forces reach equilibrium. If downstream pressure falls, or drive pressure is increased, cycling restarts automatically. Actual outlet pressure and flow depend on friction, back pressure, drive-air condition and the selected pump.

Available configurations

Compact low-power pump for intermittent testing and actuation
Single-air-head pump for general pressurisation duty
Double-air-head or staged arrangement for higher outlet pressure
Double-acting hydraulic section for increased flow
Pump package with reservoir, controls, gauge and isolation valves

Main components

Air-drive piston and cylinder
Pilot-operated cycling valve
Hydraulic plunger or piston
Inlet and outlet check valves
Fluid-compatible dynamic seals
Distance piece or vented separation where required
Air filter, regulator, gauge and speed control
Reservoir, suction strainer and pressure-side accessories

Typical upstream applications

Hydrostatic and liquid leak testing
Well equalisation using an approved compatible liquid
Chemical, methanol, glycol or grease injection where materials and seals are suitable
Wellhead and valve hydraulic actuation
Packer inflation and hydraulic-tool operation
Relief-valve liquid testing and setting

SELECTION DATA

Configuration and supply basis

Pressure basis	Required working/test pressure, hold time and acceptable pressure stability
Flow basis	Required fill rate, displacement and flow at operating pressure
Drive supply	Available air pressure, flow, quality and hazardous-area constraints
Process liquid	Type, viscosity, lubricity, temperature and compatibility
Wetted materials	Selected against fluid, corrosion and cleanliness requirements
Seal system	Selected against pressure, temperature, fluid and cycling duty
Arrangement	Bare pump, portable assembly, panel, frame or skid package
Controls	Manual regulation, remote pilot, automatic cycling or project-specific logic
Verification	Performance, leak and functional tests against approved datasheet and ITP

Technical validation

Energy Equipment International supplies equipment against the approved enquiry. These descriptions explain the family and selection logic; they are not fixed GRD manufacturing specifications. Pressure, flow, materials, hazardous-area suitability and certification must be confirmed in the selected supplier’s approved documents. Pneumatic testing and compressed-gas service require a project-specific safety review and approved procedure.