DN25-DN100 NM Type Stainless Steel Single Screw Pump

Model NO. PWSNM

Flow Capacity Range：0.5-200
Head：60-300m
Inlet/Outlet Range：DN25-DN300
Motor Power：0.55-30kW
Conveying materials: Various viscous pastes, cement and ect.

Quantity

Stainless Steel Single Screw Pump

Engineered for stable transfer of high-viscosity, solid-laden, and gas-liquid mixtures in chemical, pharmaceutical, and mining industries, this single stage hydraulic pump combines a screw pump's precision with 316L stainless steel pump durability. Its single-screw stator-rotor design ensures low pulsation, high-pressure valveless operation, and corrosion resistance, delivering energy-efficient solutions for harsh industrial environments.

Technical Advantages

Continuous low pulsation transmission

NM type screw pump realize continuous transmission with nearly zero pulsation in flow rate through the precision meshing of screw and stator, which guarantees process stability.

High Pressure Valveless Conveying

High-pressure conveying can be realized without relying on external valves, which reduces the risk of valve wear, leakage and other failures, and is suitable for long-distance pipelines or high-resistance working conditions.

Strong self-priming ability

Self-priming height up to 6 meters, no need for bottom valve or auxiliary pilot device after the first injection, can directly handle gas-containing media or high-viscosity fluids, fast start/stop response.

Seal Structure Design

Standard single end mechanical seal

Adopting single end face structure with precision fitting of dynamic ring and static ring, relying on the axial compensation ability of spring or bellows, dynamically adapting to the vibration of the shaft system and slight abrasion, applicable to conventional media (such as clean water, neutral liquid) and low and medium temperature environments (≤ 80 ℃).

Double face mechanical seal

Adding a second sealing surface, forming an isolated chamber and injecting buffer fluid (such as glycerin or inert gas), suitable for strong corrosive media (such as concentrated sulfuric acid, chlorinated sludge) or micro-negative pressure environment.

Double end face design can block the medium leakage, while the buffer liquid pressure can be monitored in real time to realize the leakage alarm.

Single Screw Pump vs Gear Pump

Comparison Dimension	Single Screw Pump	Gear Pump
Working Principle	Operates via an eccentric helical rotor rotating inside a elastomeric stator, forming sealed cavities that progress fluids axially.	Operates via the meshing rotation of gears to create volume changes that draw in and discharge fluid.

Viscosity Adaptability	Excellent for medium to ultra-high viscosity fluids, as well as shear-sensitive slurries and mixtures.	Ideal for low, medium, and high-viscosity clean fluids without solids (e.g., oils, resins).
Flow Stability & Pulsation	Non-pulsating. Delivers smooth, continuous, and steady output flow.	Continuous flow with minor pulsations due to gear tooth meshing.

Typical Applications	Wastewater treatment (sludge/scum transfer), food pastes, paper pulp, chemicals, and abrasive slurries.	Petrochemicals, lubrication systems, polymer/fiber processing, fuel transfer, and paints/coatings.

FAQ

Q1. What is a single screw pump and how does it work?
A single screw pump is a type of positive displacement rotary pump. It operates by rotating an eccentric rotor (screw) inside a precision rubber stator, creating sealed cavities that continuously and smoothly push the medium from the inlet to the outlet.

Q2. What kind of media is a single screw pump suitable for?
It is ideal for conveying high-viscosity media, media containing solid particles or fibers, and shear-sensitive fluids (such as sludge, paper pulp, chemical slurries, high-viscosity oils, and food slurries).

Q3. Can this pump run dry (idle)?
No. The stator and rotor are typically made of metal and rubber. Dry running generates intense friction that quickly produces high temperatures and burns out the rubber stator.

The Stainless Steel Single Screw Pump from PWS is a high-performance screw pump designed for precision fluid handling in demanding industrial applications. As a single-stage hydraulic pump, it delivers smooth, pulsation-free flow with exceptional efficiency, making it ideal for transferring viscous, abrasive, or shear-sensitive media. Crafted from corrosion-resistant stainless steel, this stainless steel pump ensures durability and compliance with hygienic standards, suitable for food processing, chemical dosing, and wastewater treatment. Its robust construction, self-priming capability, and low maintenance design provide reliable operation in harsh environments, maximizing productivity while minimizing downtime. The following is the products specification:

NM Pump Model Selection (low pressure primary sludge feed pump)
NO.	Model	Flow m³/h	Head MPa	Speed rpm	Power kW	Size DN		Noted
NO.	Model	Flow m³/h	Head MPa	Speed rpm	Power kW	Inlet mm	Outle tmm	Noted
1	NM015BY01L06B	0.1~0.4	0.6	150~430	0.55	11/4"	11/4"	Pumpwing P A M
2	NM021BY01LO6B	0.5~1	0.6	200~400	0.75	11/4"	11/4"	Pumpwing P A M
3	NM031BY01L06B	1.5~3	0.6	200~380	1.5	50	50	Pumpwing P A M
4	NM038BY01L06B	4~5	0.6	208~250	2.2	65	65	Pumpwing P A M
5	NM031BY01L06B	1～2	0.6	150~250	1.5	50	50	Pumping Sludge
6	NM038BY01L06B	3~5	0.6	150~250	3	65	65	Pumping Sludge
7	NM045BY01L06B	6~10	0.6	150~250	3	80	80	Pumping Sludge
8	NM053BY01L06B	15~20	0.6	200~300	5.5	80	80	Pumping Sludge
9	NM063BY01L06V	25~30	0.6	200~280	5.5	100	100	Pumping Sludge
10	NM063BY01L06V	35	0.6	312	7.5	100	100	Pumping Sludge
11	NM076BY01L06V	40~60	0.6	200~270	11~15	125	125	Pumping Sludge
12	NM090BY01L06V	60~80	0.6	200~270	18.5	150	150	Pumping Sludge
13	NM105BY01L06V	80~120	0.6	170~250	22	150	150	Pumping Sludge
NM Pump Model Selection (High Pressure Secondary Sludge Feed Pump)
NO.	Model	Flow m³/h	Head MPa	Speed rpm	Power kW	Size DN		Noted
NO.	Model	Flow m³/h	Head MPa	Speed rpm	Power kW	Inlet mm	Outletmm	Noted
1	NM015BY02S12B	0.05~0.2	1.2	150~400	0.55	11/4"	11/4"	Pumpwing P A M
2	NM021BY02S12B	0.2~0.5	1.2	170~380	0.75	11/4"	11/4"	Pumpwing P A M
3	NM031BY02S12B	0.5~1.5	1.2	150~420	1.5	50	50	Pumpwing P A M
4	NM038BY02S12B	1.2~4	1.2	150~370	3.0	65	65	Pumping Sludge
5	NM045BY02S12B	2~7	1.2	180~320	4.0	80	80	Pumping Sludge
6	NM053BY02S12B	3~12	1.2	100~340	5.5	80	80	Pumping Sludge
7	NM063BY02S12B	5~20	1.2	100~320	7.5	100	100	Pumping Sludge
8	NM076BY02S12B	10~30	1.2	120~320	11~15	125	125	Pumping Sludge
9	NM096BY02S12B	15~50	1.2	120~300	18.5~22	150	150	Pumping Sludge
10	NM105BY02S12B	40~60	1.2	170~250	22~30	150	150	Pumping Sludge

The PWS series Stainless Steel Single Screw Pump, as an innovative product that integrates the advantages of Single Stage Hydraulic Pump and Screw Pump technology, achieves stable transportation of high viscosity, solid particles, and corrosive media through the precise engagement of its core components - stainless steel eccentric screw rotor and double line spiral liner. This pump simplifies equipment complexity with a single-stage hydraulic drive structure, while relying on the corrosion resistance of stainless steel material, it demonstrates excellent process adaptability in industries such as chemical, food, pharmaceutical, and environmental protection, becoming an efficient solution for fluid transportation under complex working conditions.

1. Pump Head Parts & Drive Units
Part No.	Name	Qty	Part No.	Name	Qty
B001	Discharge Casing / Outlet Body	1	B006	Mechanical Seal Housing / Seat	1
B002	Front Support Leg	1	B007	Close-Coupled Bracket	1
B003	Motor Pin Retaining Sleeve	1	B008	Bearing Frame / Housing	1
B004	Baseplate / Pump Base	1	D001	Vertical Reducer / Gearbox	1
B005	Suction Chamber / Inlet Body	1	D002	Vertical Motor	1
2. Wear Parts (Non-Warranty)
Part No.	Name	Qty	Part No.	Name	Qty
Y001	Stator	1	Y009	Drive Shaft	1
Y002	Rotor	1	Y010	Connecting Pin for Motor Shaft	1
Y003	Short Bushing for Coupling Pin	4	Y011	Connecting Rod / Coupling Rod	1
Y004	O-Ring for Universal Joint	4	Y012	Clamp Ring / Hose Clamp	2
Y005	Coupling Pin for Universal Joint	2	Y013	Skeleton Rubber Protective Boot	2
Y006	Long Bushing for Coupling Pin	2	Y014	O-Ring for Mechanical Seal Housing	1
Y007	Steel Wire Circlip for Protective Sleeve	2	Y015	Rotary Ring for Mechanical Seal	1
Y008	Protective Sleeve for Coupling Pin	2	Y016	Stationary Ring for Mechanical Seal	1
3. Hardware / Fasteners
Part No.	Name	Qty	Part No.	Name	Qty
W001	Tie-Rod Nut	6	W010	Flat Washer for Suction Chamber Nut	8
W002	Spring Washer for Tie-Rod Nut	6	W011	Fastening Bolt for Suction Chamber Connection	4
W003	Flat Washer for Tie-Rod Nut	6	W012	Fastening Bolt for Reducer Connection	4
W004	Plug and Gasket for Discharge Casing	1	W013	Flat Washer for Reducer Connection Nut	4
W005	Stator Tie Rod / Clamping Rod	4	W014	Spring Washer for Reducer Connection Nut	8
W006	Fastening Nut for Motor Pin Sleeve	1	W015	Fastening Nut for Reducer Connection	4
W007	Plug and Gasket for Suction Chamber	1	W016	Flat Washer for Baseplate Fastening Bolt	4
W008	Fastening Nut for Suction Chamber Connection	4	W017	Spring Washer for Baseplate Fastening Bolt	4
W009	Spring Washer for Suction Chamber Nut	4	W018	Fastening Bolt for Baseplate Connection	4

The Stainless Steel Single Screw Pump from PWS is designed for straightforward installation while ensuring optimal performance in various industrial applications. As a reliable single-stage hydraulic pump, proper mounting and alignment are crucial to maximize efficiency and service life. This screw pump features a robust stainless steel pump construction that withstands corrosive environments while maintaining precision fluid handling capabilities. The following installation guidelines will help you correctly position, connect, and commission your pump system to achieve smooth operation with minimal vibration and maximum durability.

Transition Pipe GDG Reference Table
Stages GDG Model	1	2	3	4	6	8	10	12
015	110	180	260	350	490	650	800	980
021	150	250	370	480	700	920	1130	1350
031	190	350	480	620	910	1200	1470	1780
038	250	460	660	870	1280	1660	2070	2470
045	300	530	760	1000	1480	1920	2380	2890
053	350	650	910	1200	1780	2320	2900	3490
063	390	730	1050	1380	2020	2350	3300	3960
076	460	850	1210	1600	2320	3080	3800	4570
090	530	980	1420	1880	2770	3660	4550
105	660	1210	1780	2330	3460	4570
125	770	1450	2100	2760	4080
148	920	1720	2510	3300
180	1060	1950

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Contact PUMP WISE

We Usually Respond Within 24 Hours Between Monday-Friday

WENZHOU PUMP WISE FLUID EQUIPMENT CO., LTD.

Self Priming Pump

Sewage Pump

Diesel Pump

Sales Manager：+39 389 949 9067

Sales Representative：+39 344 7395079
Sales Manager WhatsApp：+86 19518108981

winnie@pumppioneer.com

NO. 8, NORTH ROAD, PUMP AND VALVE INDUSTRIAL ZONE, DONGOU HETIAN INDUSTRIAL ZONE

Motor & Electronic Control

IBAN: LU814080000047209734

Account Holder Name: PUMP WISE FLUID EQUIPMENT CO., LTD

Currency of Receipt: EUR GBP PLN

Bank Name: Banking Circle S.A.

Bank Location: Luxembourg

Bank Address: 2 Boulevard de la Foire L-1528 Luxembourg Luxembourg

Account Type: checking

Swift Code: BCIRLULL (BCIRLULLXXX, if 11 characters are required)