What is the difference between PP injection moulded (PM) and PP solid (PP) housing types?

PM (injection moulded polypropylene) is produced in a mould for lower-cost, standardised geometry and is available in the smaller DL 15 to DL 40 sizes. PP (solid polypropylene) is machined from solid bar stock, giving tighter tolerances, consistent material density throughout, and availability across all sizes including DL 50 and DL 80.

Which housing material is recommended for hydrofluoric acid (HF)?

PTFE (PT or TL) is the preferred housing material for hydrofluoric acid. PVDF is suitable for dilute HF at lower concentrations and temperatures. Polypropylene is not recommended for HF service. Confirm HF concentration and temperature with PC Engineering for a material compatibility confirmation.

Why would I choose an electrically conductive housing (PL or TL)?

Electrically conductive housings allow the pump to be earthed and bonded to prevent static charge buildup. This is required when pumping flammable solvents in ATEX-rated areas, and in sensitive electroplating lines where stray currents could damage work pieces or affect plating quality.

Is the Series P suitable for sodium hypochlorite (bleach) service?

Yes. For sodium hypochlorite, PVDF (PV) or PTFE (PT) housing with EPDM diaphragms is the standard recommendation. Polypropylene is acceptable for dilute concentrations at ambient temperature. Confirm concentration and temperature with PC Engineering.

What is the maximum temperature rating for the Series P pumps?

Polypropylene housings (PM, PP, PL) are rated to +60°C maximum. PVDF housings (PV) are rated to approximately +80°C. PTFE housings (PT, TL) are rated to +100°C. All ratings are for continuous duty at maximum concentration; higher temperatures reduce pressure ratings.

DEPA · AIR OPERATED DIAPHRAGM PUMPS

DEPA Series P Plastic Air Operated Diaphragm Pumps – PP, PVDF, PTFE AODP

Name: DEPA Series P Plastic Air Operated Diaphragm Pumps – PP, PVDF, PTFE AODP
Brand: DEPA

DEPA Series P plastic AODPs in polypropylene, PVDF, and PTFE. Corrosion-resistant, 5 sizes from 1/2" to 3", electrically conductive options. Available at

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Overview

The DEPA Series P is a plastic-bodied Air Operated Diaphragm Pump designed for corrosive and chemically aggressive media where metal housings are unsuitable. Pump bodies are either mechanically machined from solid plastic bar stock or injection moulded, providing precise dimensional tolerances and consistent chemical resistance throughout the material thickness.

Six housing material options — polypropylene (standard, solid, and electrically conductive), PVDF, PTFE, and electrically conductive PTFE — cover the full range of acids, alkalis, solvents, and oxidising agents encountered in chemical processing, galvanic, and pharmaceutical applications. The electrically conductive PL and TL variants allow safe earthing of the pump in hazardous or static-sensitive environments.

Operating entirely on compressed air, the Series P requires no electrical supply at the pump, making it inherently safe for chemical stores, outdoor installations, and areas classified for explosive atmospheres. Max operating pressure is 7 bar across all five sizes.

Key Features

Six plastic housing materials: PP injection moulded, PP solid, PP conductive, PVDF, PTFE, PTFE conductive
Five pump sizes (DL 15 to DL 80) covering 0.5 to 70 m³/h
Electrically conductive versions (PL, TL) for grounding in static-sensitive or ATEX areas
Dry self-priming up to 9 m WC suction lift
Tolerant of dry running with no pump damage
No dynamic shaft seals — complete media containment
Handles corrosive, aggressive, and oxidising media
ATEX compliant versions available
Infinite flow regulation via air pressure adjustment
Can run against a closed discharge valve

Specifications

Parameter	Value
Housing Materials	PP (injection moulded), PP (solid), PP (conductive), PVDF, PTFE, PTFE (conductive)
Size Range	DL 15 (1/2") to DL 80 (3")
Max Flow Rate	Up to 70 m³/h (DL 80)
Max Operating Pressure	7 bar
Suction Lift (dry self-prime)	Up to 9 m WC
Diaphragm Materials	EPDM, FKM, Nitrile, PTFE
Temperature Range (Polypropylene)	0°C to +60°C
Temperature Range (PTFE)	-20°C to +100°C
Compliance	ATEX, CE
Size	PM (PP moulded)	PP (solid)	PL (PP cond.)	PV (PVDF)	PT (PTFE)	TL (PTFE cond.)
DL 15 (1/2")	●	●	●	●	●	●
DL 25 (1")	●	●	●	●	●	●
DL 40 (1 1/2")	●	●	●	●	●	●
DL 50 (2")	—	●	●	●	●	●
DL 80 (3")	—	●	●	—	—	—
Model	Port	A	B	C	D
DL 15	1/2"	212	293	185	195
DL 25	1"	263	372	252	230
DL 40	1 1/2"	353	489	334	255
DL 50	2"	450	622	448	340
DL 80	3"	558	785	578	420

Applications

DEPA Series P plastic pumps are the preferred choice where metal housings are attacked by the process media:

- Galvanic and Coating Processes: Transfer of electroplating solutions, pickling acids, and anodising baths requiring full corrosion resistance - Paper and Timber Industry: Bleaching chemicals, acids, and alkalis in pulp and paper processing - Paint and Varnish Industry: Water-based and solvent-based coatings, pigment dispersions - Pharmaceutical Industry: Active pharmaceutical ingredients (APIs) in corrosive solvent systems, cleaning agents - Chemical Industry: Acids, caustics, oxidising agents, and specialty chemicals requiring PVDF or PTFE wetted parts - Power Stations and Waste Disposal: Demineralised water, chemical dosing, and effluent handling

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Frequently Asked Questions

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Contact PC Engineering for pricing, availability, and technical support for DEPA Series P Plastic Air Operated Diaphragm Pumps. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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