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P.C. Engineering Corporation
DEPA Type DZ Dual Action Pumps

Overview

The DEPA Type DZ is a dual action Air Operated Diaphragm Pump that transfers two completely different media independently and simultaneously through a single pump unit. Two fully isolated pumping chambers share one air motor, ensuring both media streams are delivered at the same stroke rate and in precise volumetric proportion to each other at all times.

Each chamber has its own dedicated suction inlet and discharge outlet with no shared internal passages between the two media streams. Physical separation is maintained throughout the pump by separate diaphragms, valve assemblies, and manifold housings, ensuring the two media will never mix regardless of the pressure differential between them.

This design eliminates the need for two separate pumps, two air supplies, and the complex ratio control valves required to synchronise them. The Type DZ delivers inherent, mechanically guaranteed ratio accuracy without instrumentation or electronic controls.

Key Features

  • Two media streams pumped simultaneously in fixed volumetric ratio
  • Complete media isolation — zero cross-contamination between streams
  • Single air motor drives both chambers simultaneously — guaranteed synchronisation
  • No ratio control valves or flow meters required for proportional mixing
  • Available in aluminium (FA) and cast stainless steel 316L (SA)
  • Two sizes: DZ 15 (1/2") and DZ 25 (1")
  • Dry self-priming capability on both chambers
  • No dynamic shaft seals on either media circuit
  • Tolerant of dry running without pump damage
  • ATEX compliant versions available
  • Infinite flow regulation via single air pressure adjustment — both streams adjust simultaneously

Specifications

ParameterValue
Housing MaterialsAluminium (FA), Cast Stainless Steel 316L (SA)
Available SizesDZ 15 (1/2"), DZ 25 (1")
Media Circuits2 (fully isolated throughout)
Volumetric RatioFixed 1:1 per stroke (equal displacement chambers)
Max Operating Pressure7 bar
Diaphragm MaterialsNRS, EPDM, FKM, Nitrile, PTFE
Temperature Range (Aluminium)-10°C to +100°C
Temperature Range (Stainless Steel)-25°C to +130°C
ComplianceATEX, CE
HousingDZ 15 (1/2")DZ 25 (1")
FA — Aluminium●●
SA — Cast Stainless Steel 316L●●

Applications

The DEPA Type DZ is used wherever two media must be transferred in proportion without mixing or cross-contamination:

- Surface Treatment: Simultaneous metered transfer of two-component surface treatment chemicals (etchant and rinse, or two-part conversion coatings) at fixed ratio - Waste Water Treatment: Transfer of two-component chemical dosing systems (coagulant and flocculant, or acid and neutraliser) in treatment plants - Printing Industry: Two-component ink and hardener metering systems in industrial printing and coating lines - Paper Processing: Simultaneous transfer of sizing agent and catalyst, or two-part retention aid systems in paper machine chemical dosing - Furniture Industry: Two-component adhesive (resin and hardener) transfer and metering for wood bonding and laminating applications

Product Images

DEPA Type DZ Dual Action Pumps

Frequently Asked Questions

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