Mechanical diaphragm

GW / GS series

Mechanical diaphragm metering pump, up to 53 L/h at up to 10 bar

GW / GS series: mechanical diaphragm metering pumps for accurate, repeatable dosing of chemicals and additives. 18 models from 1.1 to 53 L/h, with pressure up to 10 bar. Pump-head and diaphragm materials are chosen for your liquid; send us the chemical, concentration and temperature and we will confirm the right head.

Mechanical drive diaphragm; the material side has no diaphragm, so liquids pass easily
Pump heads in PVC, PVDF or 316SS; self-cleaning check valve structure
GW: variable eccentric structure for smooth flow pulsation
GS: reliable cam structure with sliding bearing; low noise, easy maintenance for harsh conditions
Power 380 V three-phase, 220 V single-phase or three-phase, 50/60 Hz; switch controller (on/off) adjusts output flow

View 18 models

Flow: 1.1–53 L/h
Pressure: up to 10 bar
Models: 18

Sizes

The 18 models of the GW / GS series range grouped by type. Open the Models tab for every model with its performance data.

Type	Flow range	Pressure	Motor	Models
GS	4.5–53 L/h	2–10 bar	25 W	8
GW	1.1–53 L/h	2–10 bar	25 W	10

Models

Filter by duty point, mains frequency or size. Click a model for its performance curve and data.

Model table (PDF)

Model	Series	Flow L/h	Pressure bar	Strokes/min	Motor W	Plunger mm
GW001	GW	1.1	10	50	25	—	Details
GW002	GW	2.2	10	100	25	—	Details
GW003	GW	4.5	10	20	25	—	Details
GW005	GW	6	10	30	25	—	Details
GW010	GW	13	10	50	25	—	Details
GW025	GW	24	7	83	25	—	Details
GW030	GW	30	7	100	25	—	Details
GW035	GW	36	5	120	25	—	Details
GW045	GW	46	4	150	25	—	Details
GW055	GW	53	2	166	25	—	Details
GS003	GS	4.5	10	20	25	—	Details
GS005	GS	6	10	30	25	—	Details
GS010	GS	13	10	50	25	—	Details
GS025	GS	24	7	83	25	—	Details
GS030	GS	30	7	100	25	—	Details
GS035	GS	36	5	120	25	—	Details
GS045	GS	46	4	150	25	—	Details
GS055	GS	53	2	166	25	—	Details

Performance range

Every model of the GW / GS series range by flow and pressure. Click a line or dot to open that model with its full data.

Logarithmic scales. Published catalogue data for clean water; the correct model for your duty is confirmed by our engineers.

Spare parts for GW / GS series

Typical wear and service parts for this type of pump. The exact part, material and part number depend on the model, so send us the model code (or a nameplate photo) and we confirm and quote the right one.

Request spare parts quote

Part	What it does
Diaphragm	The flexing membrane that moves the liquid; replaced at the service interval
Check valves (suction and discharge)	Valve balls, seats and springs that give one-way flow
Pump head	Liquid end in the material suited to the chemical
Gaskets and O-rings	Seal the head, valves and connections
Hydraulic oil and relief / bleed valve	Hydraulic diaphragm types only: transmits the stroke and protects against over-pressure
Stroke adjuster and motor	Sets the flow rate and drives the pump

Generic list for this pump type; it is not a part-number catalogue for the series. Our team confirms the correct part for your model before quoting.

Specification & options

Key parameters

Max flow rate53 L/h
Max pressure10 bar
Steady-state accuracy±1 %
Max suction lift1.5 m water column
Max ambient+40 °C
Max inlet pressure1 bar

Motor options

Code	Description
1	25 W, 1440 rpm, 3PH-50 Hz-380 V, IP54/F/TEFC
2	25 W, 1440 rpm, 1PH-50 Hz-220 V, IP54/F/TEFC
3	Consult CNP

Connections

Code	Description
P	NPT thread (GW003–GW055, GS003–GS055: 1/2" F)
Q	Hard pipe fittings of inner pipe nozzle (DN15)
R	Hose connector (PVC hose 4×6 / PE hose 4×6 / 4F hose 4×6 / 6×12 / 6.35×9.52)
X	Special interface

Fluid end and materials

Code	Fluid end
P	PVC fluid end
T	PVDF fluid end
S	316 fluid end
Z	Special fluid end (consult CNP)

Technical data

Typical applications

Reverse osmosis (ultrafiltration)
industrial water
wastewater
swimming pools
desalination and other water treatment

Data basis

CNP metering pump selection manual, printed pp. 8–10

Performance values are taken from the published CNP catalogue data. Our engineers confirm the final selection for your liquid, temperature, supply and site before quoting.