Diaphragm Head for Chemical Dosing Pumps

Product Specifications

Technical details and manufacturing context for Diaphragm Head

Definition

In chemical dosing pumps, the diaphragm head is the critical assembly where the flexible diaphragm is mounted. It converts the mechanical motion from the pump drive into precise volumetric displacement of chemicals. The head typically consists of a housing, diaphragm, valves, and sealing elements that work together to create suction and discharge cycles for accurate chemical metering. The diaphragm head is designed to handle a range of operating conditions, with maximum operating pressure typically between 1.0 and 1.6 MPa, diaphragm diameters from 50 to 200 mm, and stroke lengths from 10 to 50 mm. Flow rates can range from 0.5 to 500 L/h, depending on stroke and frequency. Operating temperature is limited by diaphragm material, typically -20 to 80 °C. Common diaphragm materials include PTFE and EPDM, while the head housing may be made of PTFE, stainless steel 316L, PVDF, or EPDM. Connection sizes range from DN15 to DN50 (per DIN EN 1092-1), and the weight of the head assembly is typically 5 to 30 kg. Leakage rate is specified as 0 to 0.1 mL/min, and repeatability is ±0.5%. These values are directory reference ranges and must be confirmed for the specific model and application. The diaphragm head is a component used in chemical dosing systems, and its selection depends on the chemical compatibility, pressure, temperature, and required flow rate. Proper installation and maintenance are essential to ensure accurate dosing and prevent leakage. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The diaphragm head operates through reciprocating motion. When the pump actuator moves, it flexes the diaphragm within the head chamber, creating pressure differentials. During the suction stroke, the diaphragm retracts, creating a vacuum that opens the inlet valve and draws chemical into the chamber. During the discharge stroke, the diaphragm extends, increasing pressure to close the inlet valve, open the outlet valve, and expel the chemical through the discharge line.

Common Materials

PTFE (Polytetrafluoroethylene), Stainless Steel (316L), PVDF (Polyvinylidene Fluoride), EPDM (Ethylene Propylene Diene Monomer)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diaphragm Diameter	50–200 mm	Determines flow rate per stroke
Stroke Length	10–50 mm	Adjusts displacement volume
Flow Rate	0.5–500 L/h	Depends on stroke and frequency
Operating Temperature	-20–80 °C	Limited by diaphragm material
Diaphragm Material	PTFE/EPDM	Chemical compatibility critical
Connection Size	DN15–DN50	Matches piping systemDIN EN 1092-1
Weight	5–30 kg	Affects installation and support
Leakage Rate	0–0.1 mL/min	Zero leakage for safety
Repeatability	±0.5 %	Critical for dosing accuracy

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 Membrane Part
Flexible barrier that separates the chemical from the drive mechanism and creates pumping action

Material: PTFE or EPDM
Head Housing Part
Rigid structure that contains the diaphragm and provides mounting points for valves

Material: Stainless Steel or PVDF
Valve Assembly
Check valves that control the direction of chemical flow during suction and discharge cycles

Material: Stainless Steel with PTFE seals
Sealing Gaskets Part
Prevent chemical leakage between mating surfaces of the head assembly

Material: EPDM or Viton

Applied To / Applications

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

Chemical Dosing Pumps

View system integration details

Manufacturers of Diaphragm Head

Manufacturer profiles associated with Diaphragm Head.

Sourcing Diaphragm Head from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the function of a diaphragm head in a chemical dosing pump?

The diaphragm head houses the flexible diaphragm and converts mechanical motion from the pump drive into precise volumetric displacement of chemicals. It creates suction and discharge cycles to accurately meter chemicals.

What materials are commonly used for diaphragm heads?

Common materials include PTFE, stainless steel 316L, PVDF, and EPDM. The diaphragm itself is often made of PTFE or EPDM, depending on chemical compatibility.

What are typical operating parameters for a diaphragm head?

Typical ranges include maximum operating pressure of 1.0–1.6 MPa, diaphragm diameter of 50–200 mm, stroke length of 10–50 mm, flow rate of 0.5–500 L/h, and operating temperature of -20 to 80 °C. These are reference ranges and must be confirmed for the specific model.

How should I verify the suitability of a diaphragm head for my application?

Check the chemical compatibility of the wetted materials, required pressure and temperature, flow rate, and connection size. Always consult the legal manufacturer or supplier for model-specific data and standards compliance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Diaphragm Head

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	Up to 200 bar
flow rate:	0.1 to 1000 L/h
temperature:	-20°C to 120°C
slurry concentration:	Up to 60% solids by weight

Diaphragm Head

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards