NM series progressive cavity pump

As an NM series progressive cavity pump supplier, Jiangsu Sharp Pump Co., Ltd. supplies a robust, interchangeable progressive cavity pump engineered for continuous, gentle, low-pulsation transfer across a wide range of industrial fluids. Our NM series is designed as a high-performance alternative to original equipment NM pumps, delivering stable flow even under high-pressure conditions and fluctuating viscosity. We manufacture complete pumps, rotors, stators, coupling rods, and drive shafts in-house, giving project teams a single source for new installations, retrofits, and long-term spare parts.

NM Series Range and Positioning

The NM series is our core interchangeable progressive cavity pump line. It is built to match the mounting envelope and hydraulic performance of established NM pump installations, allowing a drop-in replacement without piping or baseplate modification. We position this series for applications where low shear, accurate dosing, and consistent flow are more important than high-speed centrifugal action.

• Interchangeable design: Rotor, stator, coupling rod, and seal dimensions follow the original NM series interface.
• Low-pulsation flow: Progressive cavity geometry produces a smooth, non-pulsating discharge suitable for metering and shear-sensitive products.
• Wide media range: Handles low-viscosity liquids, hardly flowing pastes, products with solids, and abrasive or sticky media.
• Maintenance-optimized: Readily available interchangeable spare parts reduce downtime and simplify planned maintenance.

For projects requiring a different mounting orientation or feed arrangement, we also supply the BN series progressive cavity pump and vertical/open-hopper configurations within our broader progressive cavity pump range.

Application Fit and Media Handling

The NM series is specified across industries where controlled transfer of difficult media is critical. Typical applications include:

• Pulp & paper: coating slurries, starch, and filler suspensions
• Food processing: dough, fruit pulp, syrups, and viscous pastes
• Environmental protection: dewatered sludge, polymer dosing, and filter press feed
• Oil & gas: crude oil transfer, drilling mud, and produced water with solids
• Chemical processing: polymers, adhesives, resins, and abrasive slurries
• Power generation: lime slurry, flue gas desulfurization feed, and fuel oil transfer

The pump's gentle conveying action protects shear-sensitive products, while the positive displacement principle maintains flow rate even when discharge pressure varies. We configure the rotor-stator clearance and material pairing based on the specific media, solids content, and operating temperature.

Materials and Critical Specifications

We select materials from a controlled range to match the chemical compatibility, abrasion resistance, and temperature requirements of each application. Standard rotor and rotating shaft materials include 304 stainless steel, 316L stainless steel, and duplex 2205. Stator elastomers are available in NBR, EPDM, FKM, HNBR, PTFE, and silicone rubber. Custom material requests are evaluated against the process conditions.

Key specification parameters we confirm during configuration include:

• Flow rate range and required discharge pressure
• Media viscosity, solids content, and particle size
• Operating temperature and chemical compatibility
• Suction conditions (flooded, self-priming, or hopper-fed)
• Seal type and flush plan requirements

For replacement rotors and stators, we offer Rotors for NM Series and matching stators that are dimensionally interchangeable with the original equipment, allowing direct substitution without pump modification.

Configuration Options and Automation Integration

Beyond the standard pump assembly, we supply optional configurations to integrate the NM series into automated process lines and remote monitoring systems. The table below summarizes the most common options we provide.

We also support custom hopper and auger feed arrangements for extremely viscous or non-flowing media, as well as bridge-breaker paddles to prevent material accumulation in the intake zone.

Quality Assurance and Acceptance Testing

Every NM series pump is assembled under ISO-certified quality management and undergoes a water test after assembly. We provide a factory test report documenting flow and pressure performance, and a material certificate is available upon request. Our in-house manufacturing covers rotor machining, stator molding, shaft production, and final assembly, allowing us to control dimensional consistency and material traceability from raw stock to finished pump.

For critical applications, we can arrange additional inspection points or third-party witnessing based on project requirements. Standard warranty is 12 months for the pump, excluding quick-wearing parts such as rotors, stators, and mechanical seals.

Maintenance, Spare Parts, and Serviceability

The NM series is designed for straightforward maintenance. The rotor, stator, coupling rod, and mechanical seal are replaceable without removing the pump casing from the pipeline in most installations. We keep common spare parts in stock, with delivery typically within 3 days for stocked items and 1-2 weeks for non-stocked parts. Complete pump lead time is normally 2-4 weeks depending on configuration.

We provide disassembly and assembly guidance to reduce installation errors, and paid on-site installation service is available for customers who require commissioning support. Extended warranty options of one or two years beyond the standard period can be added for long-term service agreements.

Information We Use to Configure Your Solution

To prepare an accurate NM series proposal, we work from the following project data. Providing these details early helps us confirm the correct rotor-stator geometry, material pairing, seal selection, and drive sizing.

• Required flow rate (m³/h or l/min) and discharge pressure (bar)
• Transferred liquid name, viscosity, solids content, and particle size
• Operating temperature and any chemical compatibility concerns
• Suction condition: flooded, self-priming lift, or hopper-fed
• Existing pump model or dimensional envelope if this is a replacement
• Motor voltage, frequency, and control requirements
• Seal preference: single mechanical, double mechanical, cartridge, or packing

For rotor and stator replacement only, we can work from samples or drawings. If samples are not available, we will specify the critical dimensions needed to guarantee a proper match.

Frequently Asked Questions