Walchem EHE Series Metering Pumps
Outputs up to 20 GPH and 150 PSI, turndown ratio of 1800:1
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- 360 strokes-per-minute
- Dual check valve
- Dual bearing support
- Programmable 4-20mA input
Walchem EHE Series metering pumps have outputs up to 20 GPH (75 l/h) and pressure capabilities to 150 PSI (10 bar). Combining the Walchem EHE Series pump performance with a turndown ratio of 1800:1 yields a versatile pump for the water treatment industry. The control features enable the EHE Series metering pumps to be integrated into virtually any chemical feed application. The 360 stroke per-minute operation results in high resolution chemical feed and long service life. The Walchem EHE Series pumps prime in seconds and hold prime reliably. Most competitive products operate at slower speeds, resulting in slug feeding, accelerated diaphragm wear and poor feed control.
All Walchem E-Series pumps feature dual bearing support. The armature and shaft are supported with a bearing on each end, which ensures proper axial movement, enabling the E-Series to operate at 360 SPM while extending the life of the diaphragm. Dual check valve assemblies in both suction and discharge fittings feature precision ball guides and tapered seats. Precise machining and molding of parts limit valve ball travel, ensuring that balls fully seat and seal with every stroke. This superior check valve design guarantees fast priming and reliable performance. The compression ratio of a metering pump is important because it affects the pump's ability to prime and vent. The compression ratio is raised when you reduce the dead volume of the pump head during operation. All Walchem E-Series pumps feature a very high compression ratio that ensures proper feed especially with off-gassing products.