DN25-DN300 G-type Horizontal Stainless Steel Single Screw Pump

Model NO. PWSG

Flow Range：0.5-200m³/h
Product Material: 304 stainless steel, cast iron, etc
Head Range：60-300m
Inlet/Outlet Range：DN25-DN300
Motor Power：0.75-90kW
Conveying Materials: Various viscous pastes, cement and other media

Quantity

G-type Horizontal Stainless Steel Single Screw Pump

Designed for efficient handling of high-viscosity, solid-laden, and corrosive fluids, this stainless steel pump combines durability with versatility. The screw pump features a modular design using 304 stainless steel and cast iron components, ensuring adaptability across chemical, environmental, and food processing applications. Its corrosion-resistant pump stainless steel construction supports wide flow ranges and long-term reliability, delivering a cost-effective solution for demanding industrial fluid transfer needs. Developed by PWS, it excels in challenging environments while minimizing maintenance.

Core Performance

Flow coverage

0.5-200m³/h, supporting small flow precision conveying to large flow continuous operation;

Lift capacity

60-300m, meeting the needs of short-distance lifting to long-distance conveying;

Pipeline compatibility

Import and export diameter DN25-DN300, flexible adaptation to the pipeline system;

Power configuration

Motor power 0.75-90kW, matching energy consumption on demand;

Technical Highlights

Multi-material selection

This screw pump body provides 304 stainless steel, cast iron and other materials, taking into account the corrosion resistance and economy, the user can be freely selected according to the characteristics of the medium.

Low Shear Conveying

Single-screw structure design ensures smooth fluid transportation and reduces damage to the physical properties of the medium (such as emulsion stability).

Ease of Maintenance

Modular stator and rotor assemblies support quick replacement, reducing downtime and maintenance costs.

Progressive Cavity Pump vs. Centrifugal Pump

Feature / Dimension	Progressive Cavity Pump (PC Pump / Screw Pump)	Centrifugal Pump	Selection & Application Advice
1. Medium Adaptability	High-Viscosity & High-Solids Handles high-viscosity fluids (e.g., sludge, pastes, heavy oil), abrasives, and media with solids/fibers without clogging	Low-Viscosity & Clean Liquids Best for water, thin chemicals, and clean or slightly contaminated fluids. Efficiency drops sharply with viscous media.	Use PC Pump for thick sludge, polymers, and heavy fluids. Use Centrifugal Pump for clean water and high-flow circulation.
2. Flow & Pressure Characteristics	Constant Flow (Positive Displacement) Flow rate is directly proportional to speed (RPM) and remains stable regardless of discharge pressure changes.	Variable Flow (Dynamic) Flow rate decreases significantly as discharge pressure (head) increases along the performance curve.	Use PC Pump for precise dosing, metering, or high backpressure systems. Use Centrifugal Pump for general water transfer.
3. Shear Sensitivity	Very Low Shear Force Gentle, low-speed axial movement preserves delicate fluid structures, emulsions, and polymers without damage.	High Shear Force High-speed impeller rotation (1450/2900 RPM) creates strong shear stress, which can degrade or emulsify sensitive media.	Use PC Pump for shear-sensitive polymers, flocculants, emulsions, and food products.
4. Self-Priming & Dry Running	Strong Self-Priming / NO Dry Running High vacuum suction capability; however, dry running will immediately burn out the elastomeric stator due to friction heat.	Limited Self-Priming / Seal Risk Standard models require priming/foot valves; dry running will damage mechanical seals and bushings.	Install dry-running protection devices (e.g., temperature or pressure sensors) for Progressive Cavity Pumps.

FAQ

Q1: What is the working principle and main advantages?

Principle: A metal rotor rotates inside a resilient elastomer stator, creating moving sealed cavities that continuously convey fluid.
Advantages: Smooth and pulseless flow, strong self-priming capability, and excellent ability to handle high-viscosity or shear-sensitive liquids with solids.

Q2: What applications/media is it best suited for?

High-Viscosity Fluids: Slurry, polymers, resins, sludge, grease, and thick syrups.
Abrasive & Particle-Laden Fluids: Sewage sludge, paper pulp, wastewater, and fluids with soft/hard suspended solids.
Shear-Sensitive Media: Latex, emulsions, and delicate chemical/food products (does not damage media structure).

In the diverse landscape of industrial pumping solutions, the screw pump has emerged as a reliable workhorse, particularly renowned for its ability to handle viscous, abrasive, or shear - sensitive fluids with precision. When it comes to applications that demand not only efficient pumping but also resistance to corrosion and long - term durability, a stainless steel pump becomes the preferred choice. The Pump Stainless Steel category encompasses a range of options, and among them, the Horizontal Stainless Steel Single Screw Pump stands out as a testament to advanced engineering and high - quality materials. This introduction aims to set the stage for exploring the technical specifications of this innovative pump：

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 Horizontal Stainless Steel Single Screw Pump is engineered with precision components to deliver reliable performance in demanding fluid transfer applications. As a robust screw pump, its key elements include a high-precision stainless steel rotor and durable elastomer stator that work in tandem to ensure smooth, pulsation-free flow.

Every pump stainless steel component is meticulously designed to handle viscous, abrasive or sensitive media, making it ideal for food processing, chemical transfer and wastewater applications. The modular design simplifies maintenance while ensuring consistent performance in continuous operation.

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

The Horizontal Stainless Steel Single Screw Pump offers a straightforward installation process while ensuring optimal performance in various industrial applications. As a durable stainless steel pump, its corrosion-resistant construction requires proper handling during setup to maintain integrity.

Key installation considerations for this screw pump include:

Precision alignment of drive components to prevent premature wear
Proper grounding of the pump stainless steel housing for electrostatic-sensitive fluids
Correct piping configuration to minimize flow resistance
Appropriate foundation preparation to absorb operational vibrations

This versatile screw pump design accommodates both fixed and mobile installations, with all stainless steel pump connections following industry-standard flange patterns for easy integration into existing systems.

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.

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