What Is a High Pressure Pump? 2:1 AODD Pump Operation & Uses

What Is a High Pressure Pump?

A high pressure pump is a pump designed to generate higher discharge pressure than a standard pump of the same general type. In air-operated diaphragm pump applications, a high pressure pump is often used when the system requires more discharge pressure to move fluid through long pipe runs, overcome restrictions, feed equipment, or transfer thick and difficult materials.

Yamada^® High Pressure Diaphragm Pumps are specialty air-operated double diaphragm pumps designed for applications that require higher operating pressure than what is typically available from standard AODD pumps.

Yamada high pressure pumps use a 2:1 pressure ratio. That means for every unit of air pressure supplied to the pump, the pump can produce up to twice that amount of discharge pressure. For example, 100 PSI of air inlet pressure can produce up to 200 PSI of discharge pressure.

Diagram explaining how a 2:1 high pressure diaphragm pump uses compressed air on both diaphragms to produce higher discharge pressure.

How Does a High Pressure Diaphragm Pump Work?

A standard diaphragm pump uses compressed air to move two diaphragms back and forth. Each diaphragm stroke draws fluid into the pump and pushes fluid out through the discharge.

A high pressure diaphragm pump works differently. In a 2:1 high pressure design, air pressure is applied to the surface area of both diaphragms while only one liquid chamber is used to move fluid. This increases the force applied to the liquid and allows the pump to generate higher discharge pressure.

In simple terms:

Compressed air enters the pump.
Air pressure acts on both diaphragms.
One working liquid chamber is used for fluid transfer.
The available force on the liquid is increased.
The pump can produce up to twice the discharge pressure of the supplied air pressure.

This design allows the pump to overcome higher system resistance than a standard diaphragm pump.

What Does 2:1 Ratio Mean?

The 2:1 ratio describes the relationship between the air pressure supplied to the pump and the maximum discharge pressure the pump can produce.

For example:

50 PSI air inlet pressure can produce up to 100 PSI discharge pressure.
80 PSI air inlet pressure can produce up to 160 PSI discharge pressure.
100 PSI air inlet pressure can produce up to 200 PSI discharge pressure.

This makes a 2:1 high pressure pump useful when the available compressed air supply is not enough for a standard 1:1 pump to overcome the system pressure requirement.

Why Use a High Pressure AODD Pump?

A high pressure AODD pump is used when the application requires more discharge pressure than a standard pump can provide. This may be needed because of the fluid, the system layout, the distance being pumped, or the downstream equipment.

Common reasons to use a high pressure diaphragm pump include:

Long discharge lines
High system backpressure
High-viscosity fluids
Thick or difficult-to-move materials
Filter feed applications
Elevated discharge points
Applications with restrictive piping
Systems with valves, filters, nozzles, or other pressure losses
Applications where standard AODD discharge pressure is not enough

For more background on pump pressure, flow, and system conditions, visit Understanding Performance Curves.

High Pressure Pump vs. Standard Diaphragm Pump

A standard air-operated diaphragm pump is commonly a 1:1 pressure ratio pump. This means that the maximum discharge pressure is generally related to the air pressure supplied to the pump. For example, 100 PSI of air pressure may provide up to 100 PSI of discharge pressure.

A high pressure diaphragm pump uses a 2:1 ratio. This allows the pump to generate higher discharge pressure from the same air supply pressure.

The tradeoff is flow rate. Because the high pressure design uses one working liquid chamber, the flow rate is typically lower than an equivalent standard pump size. In many cases, the flow rate is roughly half of what a comparable standard AODD pump may deliver.

So the basic comparison is:

Standard AODD pump: higher flow for general transfer applications.
High pressure AODD pump: higher discharge pressure for more demanding pressure requirements.

The right choice depends on whether the application needs more flow, more pressure, or a balance of both.

High Pressure Does Not Always Mean High Flow

It is important to understand the difference between pressure and flow.

Pressure is the force needed to overcome system resistance. Flow is the volume of fluid moved over time. A high pressure pump is designed to produce greater discharge pressure, but that does not automatically mean it will deliver higher flow.

With a 2:1 high pressure diaphragm pump, the pump can produce higher discharge pressure, but the flow rate will usually be lower than a similar-size standard pump. This is a normal tradeoff of the high pressure design.

This makes high pressure pumps best suited for applications where pressure is more important than maximum flow.

Applications for High Pressure Diaphragm Pumps

Yamada high pressure diaphragm pumps are used in applications where standard pump pressure may not be enough. They can be useful across many industrial fluid-transfer processes, including:

High-viscosity fluid transfer
Long-distance material transfer
Filter feed
Chemical transfer
Oil and lubricant transfer
Paint and coatings transfer
Adhesives, sealants, and resin transfer
Process fluid transfer
Industrial batching support
Transfer to elevated tanks or equipment
Applications with restrictive piping or valves
Systems requiring higher discharge pressure

Yamada pumps are used across many industries, including chemical processing, paint and coatings, petroleum, oil and gas, filter press applications, automotive fluid transfer, mining applications, and general industrial fluid transfer.

High Pressure Pumps for Viscous Fluids

Thicker fluids require more force to move through piping, fittings, hoses, and downstream equipment. As viscosity increases, system resistance often increases as well.

A high pressure diaphragm pump may help when transferring materials such as:

Heavy oils
Lubricants
Coatings
Resins
Adhesives
Sealants
Thick process fluids
Slurries or filled materials, depending on the application

When pumping viscous fluids, the full system should be reviewed, including suction conditions, discharge piping, hose size, fluid temperature, and required flow rate.

High Pressure Pumps for Long Discharge Lines

Long pipe runs can create significant pressure loss. As fluid travels through a long discharge line, friction inside the pipe or hose increases the pressure required to maintain flow.

A high pressure pump can help overcome this added resistance. This may be useful when transferring fluid across a plant, feeding remote equipment, pumping to elevated areas, or moving material through long hose or pipe systems.

The required pump selection depends on the total system, not just the fluid. Important details include line length, pipe diameter, fittings, elevation change, fluid viscosity, and required flow rate.

Material Compatibility Matters

High pressure capability is only one part of pump selection. The pump materials must also be compatible with the fluid being transferred.

Depending on the application, pump material selection may involve:

Pump body material
Diaphragm material
Valve ball material
Valve seat material
O-rings and seals
Fluid temperature
Chemical compatibility
Solids content
Abrasiveness

For chemical applications, always review compatibility before selecting a pump. Yamada’s chemical compatibility resources can help support pump material selection.

Air Supply and System Setup

Because a high pressure diaphragm pump uses compressed air, the quality and control of the air supply are important. Clean, properly regulated air helps support consistent pump operation.

A filter regulator is commonly used to help clean and control compressed air before it reaches the pump. For more information, visit What Is a Filter Regulator?.

System accessories may also be considered depending on the application. For example, a pulsation dampener may help reduce pressure fluctuations in some discharge systems.

Choosing the Right High Pressure Pump

Selecting the correct high pressure diaphragm pump depends on the fluid and the system requirements. The pump should be selected based on more than port size alone.

Important selection factors include:

Required discharge pressure
Available air supply pressure
Required flow rate
Fluid viscosity
Fluid temperature
Chemical compatibility
Suction lift
Discharge line length
Pipe or hose diameter
Elevation change
System restrictions
Solids content
Abrasiveness
Continuous or intermittent duty
Required wetted materials

A high pressure pump may be the right choice when the application needs more discharge pressure than a standard pump can provide, and the lower flow rate is acceptable for the process.

Related Pump Types and Resources

High pressure pumps are part of Yamada’s broader specialty pump offering. Depending on the application, other pump types may also be worth reviewing.

Related Yamada resources include:

Frequently Asked Questions About High Pressure Pumps

What is a high pressure pump?

A high pressure pump is a pump designed to generate higher discharge pressure than a standard pump. In Yamada high pressure diaphragm pumps, a 2:1 pressure ratio allows the pump to produce up to twice the discharge pressure of the supplied air pressure.

What does 2:1 pump ratio mean?

A 2:1 pump ratio means the pump can produce up to two units of discharge pressure for every one unit of supplied air pressure. For example, 100 PSI of air pressure can produce up to 200 PSI discharge pressure.

Why would I use a high pressure diaphragm pump?

A high pressure diaphragm pump is used when the application requires more discharge pressure to overcome long discharge lines, high system backpressure, restrictive piping, elevated transfer points, or high-viscosity fluids.

Does a high pressure pump have more flow?

Not necessarily. A high pressure diaphragm pump can produce higher discharge pressure, but the flow rate is typically lower than a comparable standard pump size. In many cases, flow is roughly half of an equivalent standard AODD pump.

Can a high-pressure pump handle viscous fluids?

Yes, high pressure diaphragm pumps are often used for viscous or difficult-to-move fluids when additional discharge pressure is needed. Pump selection should consider viscosity, temperature, suction conditions, flow rate, and system pressure requirements.

Can a high pressure diaphragm pump be used for chemical transfer?

Yes, when the pump materials are compatible with the chemical being transferred. Material compatibility should always be reviewed before selecting a pump for chemical service.

Is a high pressure pump the same as a booster pump?

Not always. A booster pump generally increases pressure in an existing flow system. A high pressure diaphragm pump is a pump designed to create higher discharge pressure during the fluid-transfer process. The terms may overlap in some discussions, but the application should be reviewed carefully.

How do I choose the right high pressure pump?

Start with required discharge pressure, available air pressure, required flow rate, fluid viscosity, chemical compatibility, temperature, suction lift, discharge distance, pipe size, and elevation change. Yamada can help review these details and recommend the right pump configuration.

Talk to a Pump Expert

Not sure whether your application needs a standard diaphragm pump or a high pressure diaphragm pump? Yamada can help review your fluid, flow rate, pressure requirements, piping layout, air supply, and operating conditions.

Find My Rep to speak with a Yamada pump expert about high pressure diaphragm pumps and demanding fluid-transfer applications.

The Proof’s in the Pump.