DN25-DN100 LG Type Stainless Steel Direct-connected Screw Pump

Model NO. PWSLG

Flow Range：0.5 -150 m³/h
Head Range：20-120m
Inlet/Outlet Range：DN25-DN100
Self - Priming Lift ：5 m
Motor Power：0.55 - 55kW

Quantity

LG Type Stainless Steel Direct-connected Screw Pump

Designed for high-viscosity fluids and gas-containing media in petrochemical, food, and pharmaceutical industries, the stainless steel pump solves pulsation control and self-priming challenges. Featuring a screw pump mechanism with zero-pulsation conveying, 5m self-priming height, and a direct-connected compact structure, this pump stainless steel model suits DN25-DN100 pipelines, delivering stable, cost-effective performance for sensitive media and harsh conditions.

Core Advantages

Strong self-priming ability, simplified installation

With optimized gas-liquid separation chamber design, the self-priming height is up to 5 meters, which is suitable for residual gas in pipeline or intermittent operation scenarios.

Directly connected structure design, long-lasting and stable

The motor and screw pump body are directly connected through the flange, eliminating the traditional coupling and independent bearing seat, reducing the risk of mechanical loss and increasing the operating efficiency by 15%.

Low pulsation conveying, zero media damage

Screw - liner precision mesh design, conveying process without pulse, no shear, to ensure the integrity of high-viscosity fluids, containing fragile solid media.

Technical Highlights

Wide Temperature Range Adaptation

The medium temperature ranges from -30℃ to 180℃, covering frozen concentration to high-temperature steam condensate scenarios;

Seal reinforcement options

Standard single-end mechanical seal, optional double-end, cartridge seal, pressure resistance level up to 1.6MPa;

Intelligent Load Adaptation

Built-in adaptive torque adjustment system can automatically match the motor output power according to the viscosity of the medium and pipeline resistance, avoiding light load consumption or overload damage.

Progressive Cavity Pump vs. Twin-Screw / Triple-Screw Pump Comparison

Comparison Dimension	Progressive Cavity Pump (Single Screw)	Twin-Screw / Triple-Screw Pump (Multi-Screw)
Structure & Working Principle	A single helical metal rotor turning inside a resilient elastomer (rubber) stator, forming progressive sealed cavities.	Two or three intermeshing metal screws rotating inside a tight casing, usually driven by synchronized timing gears.
Structure & Working Principle
Internal Contact & Friction	Direct contact & friction between the metal rotor and the rubber stator. Higher wear over time with abrasive media.	Non-contact design (screws do not touch each other or the housing, separated by timing gears). Minimal mechanical wear.
Pressure & Flow Characteristics	Excellent high-pressure performance achieved through multi-stage stator designs; smooth, continuous, and non-pulsating flow.	Capable of very high pressures and high flow rates; continuous, perfectly pulsation-free liquid transfer.
Typical Application Scenarios	Wastewater treatment sludge, paper mill pulp, ceramic slurries, food pastes, chemical waste, and oilfield sludge.	Crude oil pipeline transfer, marine fuel oil (Bunker) systems, tank farms, chemical processing, and high-pressure hydraulics.

FAQ
Q1: How to adjust the flow rate of a progressive cavity pump?
A:The flow rate is directly proportional to the rotational speed. The most effective method is to adjust the motor speed using a variable frequency drive (VFD) to accurately control the output flow rate.

Q2: What materials are typically used for the pump's stator, and what is its lifespan?
A: Stators are usually made of elastomers such as nitrile rubber (NBR) or fluoroelastomer (FKM). Its lifespan depends on the corrosiveness of the medium, hardness of particles, temperature, and whether dry running occurs. It is a consumable part and needs to be replaced regularly.

Against the backdrop of increasingly stringent standards for high precision, corrosion resistance, and hygiene in the field of industrial fluid transportation, PWS screw pumps have become the core equipment for high value-added fluid transportation due to their low pulsation, high viscosity medium handling ability, and self-priming characteristics. Its technical parameters focus on a wide range of flow regulation, flexible head matching ability, speed optimization that adapts to different medium viscosities, and supports the transportation of complex working conditions containing solid particles or fibers, while also considering corrosion resistance, low leakage risk, and continuous stable transportation performance. It has become an ideal solution for scenarios that require zero medium pollution and high efficiency transportation.

Performance data base on immobility speed

Model	Flow rate (m3/h)	Pressure (Mpa)	Max Speed (r/min)	Motor (kw)	NPSH (m)	Suction Flange dia (mm)	Discharge Flange dia (mm)	Max Granule size (mm)	Max Fibre size (mm)
G20—1	0.8	0.6	960	0.75	4	25	25	1.5	25
G20—2		1.2		1.5
G25—1	2	0.6	960	1.5		40	32	2	30
G25—2		1.2		2.2
G30—1	5	0.6	960	2.2		50	40	2.5	35
G30—2		1.2		3
G35—1	8	0.6	960	3		65	50	3	40
G35—2		1.2		4
G40—1	12	0.6	960	4		80	65	3.8	45
G40—2		1.2		5.5
G50—1	14	0.6	720	5.5	4.5	100	80	5	50
G50—2		1.2		7.5
G60—1	22	0.6	720	11	5	125	100	6	60
G60—2		1.2		15
G70—1	38	0.6	720	11		150	125	8	70
G70—2		1.2		18.5
G85—1	56	0.6	630	15		150	150	10	80
G85—2		1.2		30
G105—1	100	0.6	500	30		200	200	15	110
G105—2		1.2		55
G135—1	150	0.6	400	45		250	250	20	150
G135—2		1.2		90

Performance data base on single stage and mobility speed

Model	Pressure 0.3Mpa			Pressure 0.6Mpa			Rev Mobile Range
Model	Rev (r/min)	Flow rate (m3/h)	Motor (kw)	Rev (r/min)	Flow rate (m3/h)	Motor (kw)	Rev (r/min)	Flow rate (m3/h)	Motor (kw)
G20—1	960	0.96	0.75—6 Phase	960	0.8	0.75—6 Phase	125~1250	0.1~1.5	1.1
	720	0.8	0.55—8 Phase	720	0.5	0.75—8 Phase
	510	0.4	0.55—4 Phase/Gear box	510	0.3	0.75—4 Phase/Gear box
G25—1	960	2.4	0.75—6 Phase	960	2	1.5—6 Phase	125~1250	0.1~3	1.5
	720	1.5	0.55—8 Phase	720	1.27	1.1—8 Phase
	510	1.08	0.55—4 Phase/Gear box	510	0.9	1.1—4 Phase/Gear box
G30—1	960	3.6	1.5—6 Phase	960	3	2.2—6 Phase	125~1250	0.2~4	2.2
	720	2.28	1.1—8 Phase	720	1.9	1.5—8 Phase
	510	1.63	1.1—4 Phase/Gear box	510	1.35	1.5—4 Phase/Gear box
G35—1	720	4.8	2.2—8 Phase	720	4.04	3—8 Phase	125~890	0.3~5	3
	510	3.36	1.5—4 Phase/Gear box	510	2.8	2.2—4 Phase/Gear box
	380	1.92	1.1—4 Phase/Gear box	380	1.6	1.5—4 Phase/Gear box
G40—1	510	6.8	2.2—4 Phase/Gear box	510	5.6	3—4 Phase/Gear box	125~890	0.3~10	4
	380	5.1	1.5—4 Phase/Gear box	380	4	2.2—4 Phase/Gear box
	252	2.65	1.1—6 Phase/Gear box	252	2.2	1.5—6 Phase/Gear box
G50—1	510	13.8	4—4 Phase/Gear box	510	11.5	5.5—4 Phase/Gear box	80~750	1~18	5.5
	380	10.2	4—4 Phase/Gear box	380	7.5	5.5—4 Phase/Gear box
	252	5.6	3—6 Phase/Gear box	252	4.4	5.5—6 Phase/Gear box
G60—1	510	20.8	7.5—4 Phase/Gear box	510	16	11—4 Phase/Gear box	63~630	1~20	11
	380	15.6	7.5—4 Phase/Gear box	380	12	11—4 Phase/Gear box
	252	7.8	5.5—6 Phase/Gear box	252	6	7.5—6 Phase/Gear box
G70—1	510	26	11—4 Phase/Gear box	510	20	11—4 Phase/Gear box	56~560	1~22	11
	380	17	7.5—4 Phase/Gear box	380	13	11—4 Phase/Gear box
	252	9.1	7.5—6 Phase/Gear box	252	7	7.5—6 Phase/Gear box
G85—1	380	32	11—4 Phase/Gear box	380	25	15—4 Phase/Gear box	37~370	2~24	15
	252	21	7.5—6 Phase/Gear box	252	16	11—6 Phase/Gear box
	189	11	5.5—8 Phase/Gear box	189	8	11—8 Phase/Gear box
G105—1	380	80	15—4 Phase/Gear box	380	65	22—4 Phase/Gear box	29~290	3~50	22
	252	44	15—6 Phase/Gear box	252	34	22—6 Phase/Gear box
	189	29	11—8 Phase/Gear box	189	22	15—8 Phase/Gear box
G135—1	380	132	37—4 Phase/Gear box	380	120	45—4 Phase/Gear box	18~180	3~56	45
	252	95	30—6 Phase/Gear box	252	80	37—6 Phase/Gear box
	189	65	18.5—8 Phase/Gear box	189	53	30—8 Phase/Gear box

Performance database on single stage and mobility speed

Model	Pressure 0.8Mpa			Pressure 1.2Mpa			Rev Mobile Range
Model	Rev (r/min)	Flow rate (m³h)	Motor (kw)	Rev (r/min)	Flow rate (m³/h)	Motor (kw)	Rev (r/min)	Flow rate (m³/h)	Motor (kw)
G20-2	960	0.96	1.5-6 Phase	960	0.8	1.5-6 Phase	125～1250	0.1～1.5	1.5
	720	0.8	1.1-8 Phase	720	0.5	1.5-8 Phase
	510	0.4	1.1-4 Phase/Gear box	510	0.3	1.1-4 Phase/Gear box
G25-2	960	2.4	1.5-6 Phase	960	2	2.2-6 Phase	125～1250	0.1～3	2.2
	720	1.5	1.1-8 Phase	720	1.27	1.5-8 Phase
	510	1.08	1.1-4 Phase/Gear box	510	0.9	1.5-4 Phase/Gear box
G30-2	960	3.6	3-6 Phase	960	3	3-6 Phase	125～1250	0.2～4	3
	720	2.28	1.5-8 Phase	720	1.9	2.2-8 Phase
	510	1.63	1.5-4 Phase/Gear box	510	1.35	2.2-4 Phase/Gear box
G35-2	720	4.8	3-8 Phase	720	4.04	4-8 Phase	125～890	0.3～5	4
	510	3.36	2.2-4 Phase/Gear box	510	2.8	3-4 Phase/Gear box
	380	1.92	1.5-4 Phase/Gear box	380	1.60	2.2-4 Phase/Gear box
G40-2	510	6.8	4-4 Phase/Gear box	510	5.6	5.5-4 Phase/Gear box	125～890	0.3～10	5.5
	380	5.1	3-4 Phase/Gear box	380	4	4-4 Phase/Gear box
	252	2.65	2.2-6 Phase/Gear box	252	2.2	3-6 Phase/Gear box
G50-2	510	13.8	5.5-4 Phase/Gear box	510	11.5	7.5-4 Phase/Gear box	80～750	1～18	7.5
	380	10.2	4-4 Phase/Gear box	380	7.5	5.5-4 Phase/Gear box
	252	5.6	3-6 Phase/Gear box	252	4.4	5.5-6 Phase/Gear box
G60-2	510	20.8	15-4 Phase/Gear box	510	16	15-4 Phase/Gear box	63～630	1～20	15
	380	15.6	11-4 Phase/Gear box	380	12	15-4 Phase/Gear box
	252	7.8	7.5-6 Phase/Gear box	252	6	11-6 Phase/Gear box
G70-2	510	26	15-4 Phase/Gear box	510	20	18.5-4Phase/Gear box	56～560	1～22	18.5
	380	17	11-4 Phase/Gear box	380	13	15-4 Phase/Gear box
	252	9.1	11-6 Phase/Gear box	252	7	11-6 Phase/Gear box
G85-2	380	32	18.5-4Phase/Gear box	380	25	22-4 Phase/Gear box	37～370	2～24	22
	252	21	15-6 Phase/Gear box	252	16	18.5-6Phase/Gear box
	189	11	15-8 Phase/Gear box	189	8	15-8 Phase/Gear box
G105-2	380	80	30-4 Phase/Gear box	380	65	37-4 Phase/Gear box	29～290	3～50	37
	252	44	30-6 Phase/Gear box	252	34	30-6 Phase/Gear box
	189	29	22-8 Phase/Gear box	189	22	22-8 Phase/Gear box
G135-2	380	132	55-4 Phase/Gear box	380	120	75-4 Phase/Gear box	18～180	3～56	75
	252	95	55-6 Phase/Gear box	252	80	75-6 Phase/Gear box
	189	65	37-8 Phase/Gear box	189	53	45-8 Phase/Gear box

Performance database on water coal medium

Model	Flow rate (m³/h)	Pressure (Mpa)	Rev (r/min)	Gear Decelerate Motor (kW)
G30-2	~1	1.2	30～300	YCT160/4A-2.2
G35-2	~2	1.2	30～300	YCT160/4A-2.2
G40-2	~3	1.2	30～280	YCT160/4A-3
G50-1	~4.5	0.6	28～280	YCT180/4A-4
G50-2	~4.5	1.2	28～280	YCT200/4A-5.5
G60-1	~6.5	0.6	25～250	YCT200/4A-5.5
G60-2	~6.5	12	25～250	YCT200/4B-7.5
G70-1	~8	0.6	25～220	YCT200/4B-7.5
G85-1	~12.5	0.6	18～180	YCT225/4A-11
G105-1	~20	0.6	14～140	YCT225/4B-15
G135-1	~35	0.6	10～100	YCT250/4B-22

Note: 1.The test medium of above data is normal temperature water.
2.The performance data will be changed on different medium or different rev,the flow rate has direct proportion relationship with rev while inverse proportion with medium viscidity and thickness slurry

The application of PWS screw pump stainless steel material further enhances its adaptability in fields such as food, medicine and chemical engineering. The component design of the Stainless Steel Direct connected Screw Pump is centered around a fully stainless steel flow channel, covering precision machined screw pairs (main and driven screws), corrosion-resistant pump casings, high-performance mechanical seals, low friction bearing components, and integrated direct connected motors. Each component is optimized for material matching (such as 316L stainless steel, tungsten carbide sealing surface) and process accuracy (such as screw clearance control), achieving low shear conveying, zero leakage guarantee, and long-life operation of complex media, while meeting the requirements of sanitary cleaning and pollution-free treatment, becoming a key support in high value-added fluid processes.

No.	Name	No.	Name
1	Outlet	9	Stuff Gland
2	Pull Bar	10	Bearing House
3	Stator	11	Bearing
4	Screw Shaft	12	Gearing Shaft
5	Gimbal	13	Bearing Cover
6	Inlet	14	Coupling
7	Connect Shaft	15	Base Plate
8	Stuff Seat	16	Motor

PWS screw pump, with its advantages of low pulsation and high viscosity medium adaptability, has become the core equipment for high value-added fluid treatment. The application of stainless steel pump material further enhances its applicability in food, pharmaceutical, and chemical scenarios. The Stainless Steel Direct connected Screw Pump is designed with an integrated motor and pump body, which not only simplifies the transmission structure and reduces energy consumption, but also achieves comprehensive compatibility with acids, bases, organic solvents, and particulate media through a fully stainless steel flow channel design (including pump casing, screw, and seals). However, the installation process requires strict control of coaxiality calibration, flexible connection of inlet and outlet pipelines, and pre tightening force control of seals to avoid screw wear, leakage, or abnormal vibration caused by installation errors.

Model	L	L1	L2	L3	L4	L5	L6	H	H1	B	B1	B2	B3	B'	D	D1	D2	D3	d×k	d1×k1	d2×k2
G20-1	1010	225			690	360	1150	150	95	160	190	185	215		85	115	85	115	4×12	4×14	4×14
G20-2		100		715	310	975		140	230	175	175				85	115	85	115	4×12	4×14	4×14
G25-1	1010	225			690	360	1150	150	95	160	190	185	215		85	115	100	135	4×12	4×14	4×14
G25-2	1140	185			850	470	1280	150	95	160	200	220	250		85	115	100	135	4×12	4×14	4×14
G30-1	1150	200			850	420	1300	170	130	195	225	220	250		110	145	125	160	4×12	4×18	4×18
G30-2	1360	250			1000	575	1540	190	130	220	250	250	290		110	145	125	160	4×12	4×18	4×18
G35-1	1230	225			890	450	1410	190	135	220	250	260	285		125	160	145	180	4×14	4×18	4×18
G35-2	1450	125	600	600		615	1610	190	135	220	250	260	290		125	160	145	180	6×14	4×18	4×18
G40-1	1350	225			990	470	1510	200	130	220	250	260	285		145	180	160	195	4×14	4×18	4×18
G40-2	1540	120	650	650		665	1700	200	130	220	260	260	290		145	180	160	195	6×14	4×18	4×18
G50-1	1480	135	580	630		550	1620	225	150	250	280	250	290		160	195	180	215	6×16	8×18	8×18
G50-2	1800	140	760	760		790	1960	225	150	250	280	300	330		160	195	180	215	6×16	8×18	8×18
G60-1	1720	175	680	690		570	1810	225	160	260	300	300	330		180	215	210	245	6×16	8×18	8×18
G60-2	2040	200	800	800		820	2140	225	160				350	400	180	215	210	245	6×16	8×18	8×18
G70-1	1950	175	800	800		680	2120	245	150				350	400	210	245	240	280	6×18	8×18	8×18
G85-1	2620	210	1100	1100		945	2810	275	170				350	400	240	280	225	265	6×18	8×18	8×18
G105-1						1193		300	195						295	340	280	320	6×18	12×22	8×18
G135-1

Note: Base plate is made of iron or stainless steel, the install size of the former is lined with realline, the latter is lined with broken line.

Recommend Products

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)