NSG50 Plastic Pneumatic Diaphragm Pump



  • CNP Actively Participating in the 22nd Shandong International Water Exhibition

  • CNP Donated Medical Mask for Overseas Customers

  • ISO /TC 23/SC 18 SECRETARIAT visited CNP

  • CNP attended Aquatherm Moscow 2019

  • 2018 CNP overseas customers conference



The pneumatic diaphragm pump has a simple and highly reliable air reversing valve, which enables the whole diaphragm pump system to achieve maximum reliability under various application conditions.

The reversing valve is divided into three-way pilot valve, which can ensure that the real meaning is not sticky, and all parts can be replaced without opening the liquid cavity.

The aluminum parts are anodized and coated with epoxy coating, which can resist the corrosion of unclean air.

The reversing shaft is an integrated structure, which ensures concentricity and makes the action more smooth.

Add a filter to ensure the normal operation of the air motor.

The guide block is made of ceramic or stainless steel to adapt to different occasions.

The piston end cover adopts non-screw structure and is easy to install.

External air motor for easy maintenance.

Engineering plastics are used to save resources.

Compared with other diaphragm pumps, there are very few moving parts.

A reversing valve is suitable for pumps of various specifications.

Air valve 15 years quality assurance, pump body 5 years


Convenient maintenance: reducing internal volume can reduce waste, easy to clean stainless steel bolts can resist corrosion, and can provide reasonable positioning for easy reassembly.

Unique patented air valve: three-way control valve can achieve non-blocking operation, all parts can be easily external maintenance, no need for air line lubrication.

Precision matching parts: the bearing at the wear-resistant end ensures the correct positioning of the valve stem and is easy to replace.

Protected vents: all vents use a common end seal that prevents indoor liquefied gases from eroding the air motor and facilitates loading or unloading operations.

Strong external structure: the corrosion-resistant structure prevents leakage and ensures the replacement of clean fluids, the aluminum center parts are epoxy coated, and the corrosion-resistant center parts are made of 316 stainless steel.

Fluid compatibility: materials available for housing include aluminum, stainless steel, ductile iron, polypropylene, conductive acetal or Kynar fluoropolymers.





CNP, a green water expert beside you.


Max.working pressure: 0.84Mpa

Max.flow: 150gpm

Max.reciprocating speed: 145cpm

Max.siphon height: 5m

Max.conveying solid particles: 6.3mm

Max.air consumption: 70l / s

Air inlet size: 1 / 2in.npt

Air outlet size: 1 / 2in.npt

Media inlet size: 2in.npt

Media outlet size: 2in.npt

Weight: 28kg (polypropylene), 30.5kg (polyvinylidene fluoride)


Automotive production: 

coolants, varnishes, paints, oil emulsions, degreasing fluids

Construction industry: 

cement slurry, ceramic tile binder, rock slurry

Chemical production: 

acid, alkali dosing, detergent, emulsion, suspended solids solvent, mud, sewage

Water treatment: 

lime slurry, dry powder, wastewater





CNP integrates the advanced R&D technologies from Europe and America, with the most advanced industrial design concept in Western Europe, with the production experience of modern industrial clusters in North America, with the most efficient and energy-saving product structure research in Hangzhou, China.

With the application of information technology, CNP has built its own smart factory, taking the lead in the introduction of SAP resource management system, becoming one of the key units of the key construction project of  "machine substitution" in Hangzhou, with the whole process of production information monitoring and tracking, applying laser welding technology to the manufacturing process of robot pump spare parts in depth, using progressive die technology to ensure the quality of the whole process of the parts, all of which greatly reduce the production and manufacturing cycle, provide an intelligent production and manufacturing basis for the pump production.

CNP was recognized as state-certified enterprise technology center in 2016. It is the highest evaluation level for technology center in China. Besides, CNP has been carrying some technical courses in 11/12/13th National Five-Year Plan.

CNP uses digital integrated intelligent control technology to create domestic advanced M2M mode, intelligent control technology.

It includes intelligent current stabilization system, intelligent vacuum suppression system, intelligent auxiliary control monitoring system, intelligent non-negative pressure full frequency control system and intelligent water hammer two-way elimination system.