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Asynchronous and Synchronous Wanner Hydra-Cell Pro® Pump Designs
Since 1972 Wanner® Engineering has built sealless positive-displacement pumps for 1,000–5,000 PSIG, depending on the frame. The 1972 patent is a synchronous hydraulic-piston design. In 2009 they added higher-flow, higher-pressure frames that use an asynchronous layout. This page is the mechanical difference, written for people who already know the original 20 / 03 / 04 / 10 / 12 / 15 / 17 / 25 / 35 / 40 / 66 pumps that still use the 1972 arrangement.
A wobble plate or camshaft turns, and the Wanner Hydra-Cell Pro® hydraulic piston forms, the diaphragm flexes, liquid leaves through the outlet check. Except for the single-diaphragm 20 series, three to five diaphragms work in series so the flow is smooth. The only seal is the static clamp at the diaphragm rim — no packing, cups or mechanical seals — so the pump will run continuously on liquids that leak or wear our seals of other designs.
Synchronous Design
Synchronous means the mechanical drive (wobble plate or cam) acts directly on the Hydra-Cell piston. The angle of that plate or cam compresses the check-valve stack that makes the fast hydraulic piston. Every valve fires in a fixed order as the shaft turns.
The synchronous layout uses less oil to make and regulate that piston than the asynchronous layout. Because the motion is mechanical, displacement stays tight as pressure changes.
Asynchronous Design
T60 / T100 / T200 and Q155 / Q330 use this layout. Oil is more of an independent middle step than a rigid link. The cam drives a hydraulic piston; that piston pressurizes oil; the oil flexes the diaphragms. The Hydra-Cell valve is not one stack being pushed by the cam. Its pieces are split and decoupled from the shaft.
That spread-out valve needs more oil. The oil also sits between cam piston and valve, so there is no metal-to-metal interface. Diaphragm motion is smoother, which is how these frames take higher pressure and flow without beating themselves up.
Decoupling spreads load. A synchronous piston that is locked to the shaft sees more strain on one part at extreme pressure.
Do not confuse this with displaced volume. The asynchronous piston answers pressure changes faster because it is not bolted to the cam. That is why this layout is used at flow rates of 60 GPM and up.
It does add parts. A D66 (synchronous, up to 65 GPM at 1,000 PSI) has 63 components. A T60 (asynchronous, up to 94 GPM at 1,000 PSI) has 77.
Asynchronous frames also change oil more often. Higher pressure and more oil in the pressure loop mean hotter oil and faster breakdown.
Dynamic oil pressure is what moves the pistons, so very low RPM is not their strength. Synchronous frames own low flow and high turndown because the pistons are driven mechanically — including fractional RPM.
We have 10 / 25 / 35 pumps sitting on a pressurized line at a fraction of an RPM just to make up hydraulic losses, ready for an instant demand.
Why? Food-plant wash-down. Hold line pressure when the hoses are hung, then spin the pump up when someone opens a gun. The old way is to run the pump all shift and dump water back to the tank. On a two- or three-shift plant, one shift uses the stations hard; the others barely open a valve. A sealless synchronous Hydra-Cell Pro® will hold pressure at an almost infinite turndown. The limit is the motor — cooling and shaft torque at that crawl — not the pump.
Both layouts are sealless Hydra-Cell Pro®. The piston that drives the diaphragm is built differently. Smooth, reliable flow is the common result.
Summary of Pumping Action and Performance
- Pumping action
- Synchronous — diaphragms are tightly coupled to the cam or wobble plate through in-line hydraulic pistons and move together.
- Asynchronous — pistons are offset, so diaphragms move more on their own, which cuts pulsation.
- Performance
- Synchronous — tighter flow at lower pressure and lower rate because of the direct link.
- Asynchronous — better at high pressure and high rate; independent diaphragm motion is smoother and easier on the hardware.
- Reliability — synchronous parts see more mechanical wear at extreme pressure because the pistons are locked to the shaft. Asynchronous motion is spread out and usually lasts longer under that load.