EZB11D1-VC Walchem – Electronic Diaphragm Metering Pump


SKU: 5960.038 Category:


Principle of Operation:

As air or gas is pulled into the pump head, pump operation and gravity help work the gas bubble up through the pump head. Due to system pressure, the trapped gas compresses with each stroke and the discharge check valves will not open causing a gas or air lock condition.

The vent of the Auto Degassing Valve, however, is under no pressure and because the discharge valves are above the vent, the gas moves toward the vent with each pump stroke. The design of the double check valve in the ADV limits the amount of liquid that passes through before sealing shut forcing the rest of the volume out the discharge while gravity, coupled with the suction stroke of the pump, reseat the valves for the suction stroke.

Being compressible, as the gas makes its way to the check valves in the ADV, it will quickly purge through the Auto Degassing Valve. Once enough of the gas is purged out the vent, and each pump stroke can overcome the discharge pressure, regular pumping will resume.

During normal operation, with each stroke a small amount of liquid will be ‘vented’ out the ADV ensuring flow for the next time gas enters the pump head.

Product Group Metering Pump
Manufacturer Walchem Corporation
Brand Series EZB
Type Metering
Head Material PVC
Tube O.D. 3/8″
Connections Compression
Seals FKM
Diaphragm PTFE
Voltage 115 VAC
Maximum Flow (gph) 1
Maximum Pressure (psi) 150
Maximum Temperature (°F) 104
Hertz 50/60
Phase 1
Motor Type Electric
Output per Stroke (ml/min) 38
Output per Stroke (ml) 0.11
Stroke Speed SPM 360

Walchem Metering Pump Brochure


Additional information

Weight 9 lbs
Dimensions 12 × 12 × 6 in
Max Line Pressure (PSI)


Max Line Pressure (BAR)


Material - Head & Fittings

Kynar (PVDF)

Material - Seat & O-Rings

Teflon (PTFE)

Material - Check Ball


Material - Connection

Clear vinyl 3/8” suct tubing