Which housing material should I select for sulphuric acid service?

For dilute sulphuric acid, SA (cast stainless steel 316L) is typically selected. For concentrated sulphuric acid or mixed acid environments, HC (Hastelloy C22) provides superior corrosion resistance. Contact PC Engineering with your concentration and temperature for a confirmed material recommendation.

What is the maximum solid particle size the Series M pump can handle?

The DEPA Series M handles media with entrained solid particles. Maximum particle size depends on pump size and valve ball diameter. As a general guide, DL 50 and DL 80 sizes handle larger particle sizes. Consult PC Engineering with your particle size and slurry concentration for the correct size selection.

How is flow rate controlled on the Series M?

Flow rate is adjusted by regulating the compressed air supply pressure. Increasing air pressure increases stroke frequency and flow rate. A needle valve or air regulator on the inlet line provides infinite, stepless flow control with no additional instrumentation required.

Is a Series M pump suitable for ATEX Zone 1 or Zone 2 installations?

Yes. DEPA Series M pumps are available in ATEX-certified versions for use in explosive atmospheres. Specify ATEX zone and gas group at the time of order. Electrically conductive wetted parts and grounding provisions are included in ATEX configurations.

What diaphragm material is recommended for solvent-based paint transfer?

FKM (Viton) diaphragms are recommended for aromatic solvents, ketones, and solvent-based paints. PTFE diaphragms offer the broadest chemical resistance. NRS (natural rubber) suits water-based paints and coatings. Confirm solvent type and concentration with PC Engineering for the correct selection.

DEPA · AIR OPERATED DIAPHRAGM PUMPS

DEPA Series M Metal Air Operated Diaphragm Pumps – Cast Metal AODP for Industrial Use

Name: DEPA Series M Metal Air Operated Diaphragm Pumps – Cast Metal AODP for Industrial Use
Brand: DEPA

DEPA Series M metal AODPs in aluminium, cast iron, stainless steel, and Hastelloy. High abrasion resistance, 5 sizes from 1/2" to 3". Available at PC

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Overview

The DEPA Series M is a cast metal Air Operated Diaphragm Pump engineered for demanding industrial environments requiring high abrasion and chemical resistance. Available in six housing materials ranging from aluminium and cast iron to Hastelloy C22, the Series M covers a broad spectrum of chemical compatibility requirements across aggressive process industries.

The pump operates entirely on compressed air with no electric motor, making it inherently safe for ATEX-rated hazardous areas. Five sizes from DL 15 (1/2") to DL 80 (3") deliver flow rates from 0.5 m³/h up to 70 m³/h, handling abrasive slurries, viscous fluids, and shear-sensitive media with equal capability.

DEPA diaphragm pumps self-prime dry up to 9 metres WC suction lift, tolerate dry running without damage, and can run indefinitely against a closed valve. The absence of dynamic shaft seals eliminates the most common pump failure point and prevents media leakage.

Key Features

Six cast metal housing materials including Hastelloy C22 for aggressive chemical media
Five pump sizes (DL 15 to DL 80) covering 0.5 to 70 m³/h
Dry self-priming up to 9 m WC suction lift
Tolerant of dry running with no damage to pump
No dynamic shaft seals — zero leakage path
Handles abrasive, viscous, and shear-sensitive media
Handles media with entrained solids
ATEX compliant versions for hazardous area installations
Submersible designs available
Infinite flow regulation via air pressure adjustment
Can run against a closed discharge valve
Oil-free compressed air drive

Specifications

Parameter	Value
Housing Materials	Aluminium, Cast Iron, Cast Iron/Bronze, SS316L, SS316L/Bronze, Hastelloy C22
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	NRS, EPDM, FKM, Nitrile, PTFE, Hytrel, NRR
Temperature Range (Aluminium / Cast Iron)	-10°C to +100°C
Temperature Range (Stainless Steel 316L)	-25°C to +130°C
Compliance	ATEX, CE
Model	Port	A	B	C	D
DL 15	1/2"	190	225	180	122
DL 25	1"	236	322	241	200
DL 40	1 1/2"	310	407	306	255
DL 50	2"	412	540	415	340
DL 80	3"	510	680	522	420
Code	Material
FA	Aluminium
CA	Cast iron
CX	Cast iron / bronze
SA	Cast stainless steel 316L
SX	Cast stainless steel 316L / bronze
HC	Hastelloy C22 (2.4602)

Applications

DEPA Series M metal pumps are the standard choice for high-abrasion and chemically aggressive industrial processes:

- Paint and Varnish Industry: Transfer of pigment slurries, resins, and high-viscosity coatings without shear damage - Automobile Industry: Coolant, lubricant, adhesive, and sealant transfer on production lines - Waste Water Industry: Sludge and slurry handling in treatment plants with entrained solids - Ceramic and Porcelain Industry: Abrasive clay slurry transfer requiring high wear resistance - Mining and Building Industry: Abrasive media, cement grouts, and mineral slurries - Chemical Industry: Acids, alkalis, and process chemicals requiring material-specific housing selection

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Frequently Asked Questions

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

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