Diaphragm Pump for Spray Systems - Technical Reference

Product Specifications

Technical details and manufacturing context for Diaphragm Pump

Definition

A diaphragm pump is a positive displacement pump that transfers and pressurizes liquids using a flexible diaphragm that moves back and forth in a pumping chamber. In spray system applications, it precisely meters and delivers fluids such as coatings, chemicals, or water to spray nozzles at controlled pressures and flow rates, enabling uniform application and efficient material usage. The pump is a component within a larger system and is not a standalone product; its selection and integration require careful consideration of system requirements. The pump operates on a reciprocating mechanism where an electric motor or air-driven actuator moves the diaphragm. On the suction stroke, the diaphragm retracts, creating a vacuum that draws fluid into the chamber through an inlet check valve. On the discharge stroke, the diaphragm extends, compressing the fluid and forcing it out through an outlet check valve, producing a pulsating flow that can be smoothed with accumulators. Materials on file include stainless steel, PTFE, EPDM, and aluminum, which are selected based on fluid compatibility and application demands. Key parameters to verify for a specific model include flow rate (0.5–30 m³/h), operating pressure (1.0–1.6 MPa), maximum discharge pressure (1.6 MPa), suction lift (3–5 m), operating temperature (-20 to 80 °C), fluid viscosity (0.3–10000 cP), maximum particle size (2–10 mm), motor power (0.75–7.5 kW), voltage (380 V), ingress protection (IP54–IP65), diaphragm material (PTFE/EPDM), and weight (15–120 kg). These values are reference ranges and must be confirmed with the manufacturer for the intended application. Standards such as ISO 9906, IEC 60034, IEC 60038, IEC 60529, and ASTM D1418 are referenced for verification, but they do not imply certification. Always consult the legal manufacturer or supplier to verify model-specific values and standards.

Working Principle

The diaphragm pump operates through a reciprocating mechanism where an electric motor or air-driven actuator moves a flexible diaphragm back and forth. On the suction stroke, the diaphragm retracts, creating a vacuum that draws fluid into the pumping chamber through an inlet check valve. On the discharge stroke, the diaphragm extends, compressing the fluid and forcing it out through an outlet check valve. This creates a pulsating flow that can be smoothed with accumulators in spray system applications.

Common Materials

Stainless Steel, PTFE (Polytetrafluoroethylene), EPDM (Ethylene Propylene Diene Monomer), Aluminum

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Rate	0.5–30 m³/h	Select based on required capacityISO 9906
Max Discharge Pressure	1.6 MPa	Do not exceed to avoid diaphragm damage
Suction Lift	3–5 m	Higher lift requires priming
Operating Temperature	-20–80 °C	Above 80°C reduces diaphragm life
Fluid Viscosity	0.3–10000 cP	Higher viscosity reduces flow rate
Max Particle Size	2–10 mm	Larger particles may clog valves
Motor Power	0.75–7.5 kW	Match to required flow and pressureIEC 60034
Voltage	380 V	3-phase, 50 Hz standardIEC 60038
Ingress Protection	IP54–IP65	IP65 for dusty or wet environmentsIEC 60529
Diaphragm Material	PTFE/EPDM	PTFE for chemical resistance, EPDM for abrasionASTM D1418
Weight	15–120 kg	Depends on pump size and motor

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Diaphragm Part
Flexible membrane that creates pumping action by reciprocating movement

Material: PTFE or EPDM
Pump Head
Housing that contains the pumping chamber and fluid path

Material: Stainless Steel or Aluminum
Check Valves
One-way valves that control fluid direction at inlet and outlet

Material: Stainless Steel with elastomer seals
Air Distribution System
Controls compressed air flow to drive the diaphragm in air-operated models

Material: Aluminum or Brass
Electric Motor Optional
Drives the diaphragm on motor-driven versions instead of compressed air.
Accumulator Optional
Smooths the pulsating discharge so the spray pattern stays steady.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Spray System

View system integration details

Manufacturers of Diaphragm Pump

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Bonatech

Shandong, CN

Also makes: Reverse Osmosis Membrane, Filtration System, High Pressure Pump and 3 more