A2VK12 A2VK28 A2VK55 A2VK107 Metering Pump Polyurethane High Pressure Variable Pump

2.1 Precision You Can Repeat - Shot After Shot

The most critical requirement in polyurethane foaming is ratio consistency. If the polyol-to-isocyanate ratio drifts, foam density, cell structure, and mechanical properties change. The A2VK delivers high metering accuracy and reproducibility of the variable pumped volumes - the same handwheel setting produces the same displacement, every time.

How does this work in practice? The pump features an integral precision measuring scale built into the handwheel. Operators can set and verify displacement directly, without external gauges or calibration tools. Once set, the displacement remains stable through the production run.

2.2 Choose Your Displacement - A Practical Selection Guide

The four A2VK models are not interchangeable in application. Each serves a different output range:

Selection guidance: If your machine's maximum shot weight requires more than 80% of a given model's capacity at your standard operating speed, step up to the next size. This preserves adjustment headroom and avoids running the pump at its displacement limit continuously.

2.3 Handwheel Control - Simple, Reliable, Operator-Friendly

The A2VK uses manual adjustment via a handwheel with an integrated precision measuring scale. Turning the handwheel rotates a threaded spindle that steplessly adjusts the pump's rotary group, changing displacement from Vg min to Vg max.

Why handwheel control matters for foaming operations:

No electronics to fail - in a production environment with heat, vibration, and chemical exposure, a mechanical control eliminates a common failure point.

Immediate visual verification - the measuring scale shows the exact displacement setting at a glance.

Adjustment locking - a clamp unit prevents accidental displacement changes during production runs.

Left or right handwheel mounting - the handwheel can be mounted on either side of the pump, accommodating different machine layouts and operator positions.

2.4 Double Shaft Seal with Buffer Fluid Ports - Protection for Your Process and Your Plant

Polyurethane components are sensitive to moisture and contamination. A shaft seal failure can introduce hydraulic oil into the A-component or B-component stream, ruining an entire production batch.

The A2VK features double shaft seals with buffer fluid ports to guarantee safe operation and protect the environment. The buffer fluid chamber between the two seals provides a detection zone - if the inner seal begins to leak, the buffer fluid shows contamination before the pumped media is affected.

2.5 Open or Closed Circuit - Match Your Machine Architecture

The A2VK is available in both open circuit (O) and closed circuit (G) configurations. This allows the pump to integrate directly into different hydraulic system architectures:

Open circuit: The pump draws from a reservoir and returns fluid after the metering circuit. Simpler plumbing, easier maintenance.

Closed circuit: The pump operates in a sealed loop with a charge circuit. Provides more precise control over inlet pressure and temperature - beneficial for high-viscosity media and high-precision applications.

Selection note: Most polyurethane foaming machines use the closed circuit (G) configuration for better metering stability. Confirm your machine's existing configuration before ordering a replacement.

2.6 A7VK - The Compact Upgrade Path

If you are considering a new pump for an aging A2VK installation, or designing a new foaming machine, the A7VK series is the next-generation option. The A7VK uses the same mounting flange, drive shaft, and connection dimensions as the A2VK, making it a drop-in replacement without machine modification.

What the A7VK offers over the A2VK:

More compact design - reduced dimensions and mass

Lower noise level

More precise metering - improved volumetric efficiency through optimized rotary group

Increased corrosion protection through special surface treatment

For new machine designs, the A7VK is the preferred choice. For existing A2VK installations where a direct replacement is needed without any modification, the A2VK remains available.