Exproof Pumps

KNF corrosion-resistant process industry pumps with explosion-proof motors offer safe solutions for handling aggressive gas or liquid media. KNF gas and liquid diaphragm pumps offer high performance and long service life during continuous, heavy-duty operation.

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Gas and Liquid Pumps for Hazardous Locations (NEC/CEC HazLoc)

Class 1 Div 1 pumps

For use in hazardous locations (HazLoc). Ideal for safety-critical applications, these durable diaphragm gas and liquid pumps feature UL and CSA approved, ex-proof motors compliant for NEC Class 1, Division 1, Groups C & D, and Division 2, Groups A, B, C, D. Additionally, KNF offers ATEX-approved liquid and gas pumps for the transport of flammable/explosive media in hazardous locations.

FAQ - Selecting a Pump for Hazardous Locations

Explosion Proof Diaphragm Pumps and Compressors for Industrial Processes

KNF industrial process diaphragm pumps with explosion proof motors, in several series, can achieve flows up to 300 L/min, vacuums to 29.86 in. Hg, and pressures to 176 psig, depending on model. All process pumps are designed to minimize power requirements and reduce costs, operate oil-free (to eliminate media contamination and maintenance), run without sliding seals, and incorporate precision ball bearings for optimized reliability.  

Users may choose from 3-types of head configurations:
~ single-stage for moderate performance
~ two-stage for deeper vacuum
~ parallel-head for higher flow
These head configuration options, in addition to various combinations of materials and coatings, allow each customer to realize application-specific benefits. KNF also offers gas process industry pump models which are ATEX-compliant and certified in accordance with the 2014/34/EU directive on equipment and protective systems.
Shown here is the UN 035.3 STI EX pump, manufactured in the KNF USA production center.

UN 035.3 STI EX Details
UN 035.3 STI EX

Explosion Proof Transfer Pumps

Our liquid handling diaphragm pumps are simple in design, durable, and perform their function without the need for flexible tubing or compressed air with their associated drawbacks. These liquid pumps are excellent for either vacuum or pressure applications. They are ideal for low viscosity liquids and can be run dry continuously, without degradation and under the most severe operating conditions without external leakage.

KNF NF 1.300 and NF 1.600 series liquid pumps offer safe transfer of explosive and hazardous liquids for chemical processing, petrochemical refining, and safety-critical applications. Self-priming up to 10 ft H2O, the pumps boast a pressure of 88 psig, flow rates up to 6 L/min, and are powered by 115/230V 60Hz single phase, UL and CSA approved motors. Contamination and maintenance-free, both models are available in corrosion-resistant versions.

Shown here is the NF 1.600 HazLoc Custom Project Pump

Explosion Proof Liquid Pumps
NF 1.600 HazLoc Project

NEC / HazLoc Pumps

ATEX Pumps

Exproof Pump Applications

KNF's modular design combined with a wide selection of available materials and accessories, enables straightforward, cost-effective customization for process pumps - making them well suited for a number of applications and industries.
Gas Pumps

Flow: up to 300 l/min
Pressure: up to 176 psig
Vacuum: down to 29.86 inHg

Liquid Pumps

Flow: up to 6 l/min
Pressure: up to 88 psig
Suction: 10 ft H20

Gas Pumps

Flow: up to 220 L/min
Pressure: up to 58 psig
Vacuum: down to 29.74 inHg

Liquid Pumps

Flow: up to 6 L/min
Pressure: up to 88 psig
Suction: Up to 10 ft H2O


Hydrocarbon Processing  
Oil & Gas
Botanical Extraction


Gas analysis
Solvent Recovery


Stainless Steel


Finishes, coatings & alloys
Heat resistance
Shock/vibration isolators  
Custom mounting plates
Leak tight performance

Custom Hazardous Location Pumps

KNF uses a sophisticated modular system that enables the quick, efficient and cost-effective adaptation of the standard pump design.  By combining our pump know-how with the customer's application expertise, we are able to optimize each pump precisely to specific application requirements.
Every product modified to meet specific customer needs is assigned a separate project number. This customer-specific project is then taken as the starting point for defining the pump configuration, test conditions, packaging and other special requirements. Finally, the fact the project number is allocated to a specific customer means that third parties cannot purchase it without the customer's permission.
Customized Solutions

KNF Pumps for Hazardous Media and Locations

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