Pump Diaphragms
High-Performance Rubber Pump Diaphragms for Industrial Fluid Handling
- Diaphragm sizes from 1/4" to 55" diameter
- Withstands pressures up to 2000 psi
- Temperature range: –50 °C to +200 °C
- Available in NBR, EPDM, FKM, Silicone, Neoprene
- Single-fabric, multi-layer & metal insert configurations
What Is a Pump Rubber Diaphragm?
A pump rubber diaphragm is a flexible elastomeric component that separates the fluid side from the mechanical side inside a pump. It transfers pressure and motion, prevents leakage, handles continuous cyclic flexing, and maintains sealing integrity — all without any direct contact between the fluid and the pump’s mechanical parts.
Fabric-reinforced pump diaphragms add one or more layers of high-strength textile inside the rubber body, dramatically improving burst pressure resistance, dimensional stability, and flex fatigue life compared to unreinforced diaphragms.
Pump diaphragms operate across industries where leak prevention, chemical compatibility, and repeatable stroke movement are non-negotiable:
| Industry | Primary Pump Type |
|---|---|
| Chemical Processing | Chemical dosing pumps, AODD pumps |
| Water Treatment | Dosing pumps, metering pumps |
| Agriculture | Sprayer pumps |
| Automotive | Fuel pumps, pneumatic pumps |
| Oil & Gas | Transfer pumps, chemical injection pumps |
| Food Processing | Dosing pumps, transfer pumps |
| Pharmaceutical | Metering pumps, dosing pumps |
| Industrial Automation | Pneumatic pumps & actuators |
| Paints & Coatings | AODD pumps |
| Fluid Handling Systems | Industrial transfer pumps |
How DS Techno Rubber Builds Pump Diaphragms
Typical Construction Layers
Every pump diaphragm we produce follows a precision multi-layer construction designed for long flex fatigue life and dimensional control:
Top rubber layer — fluid-contact face, compound selected for media compatibility
Reinforcement fabric layer — bonded under heat and pressure for structural integrity
Bottom rubber layer — mechanical-side face, completes the sandwich construction
Optional metal insert — provides fastening points or load-bearing support
| Industry | Pump Type | Diaphragm Used |
|---|---|---|
| Chemical Processing | Chemical dosing pumps, AODD pumps | FKM / PTFE-faced reinforced diaphragms |
| Water Treatment | Dosing pumps, metering pumps | EPDM reinforced diaphragms |
| Agriculture | Sprayer pumps | NBR / EPDM reinforced diaphragms |
| Automotive | Fuel pumps, pneumatic pumps | NBR reinforced diaphragms |
| Oil & Gas | Transfer pumps, chemical injection pumps | FKM reinforced diaphragms |
| Food Processing | Dosing pumps, transfer pumps | Silicone / FDA-grade diaphragms |
| Pharmaceutical | Metering pumps, dosing pumps | Silicone / PTFE diaphragms |
| Industrial Automation | Pneumatic pumps and actuators | Fabric-reinforced moulded diaphragms |
| Paints & Coatings | AODD pumps | Solvent-resistant reinforced diaphragms |
| Fluid Handling Systems | Industrial transfer pumps | Multi-layer reinforced diaphragms |
Pump Diaphragm Applications
AODD pumps cycle at high frequency — often millions of strokes per year — making flex fatigue life the critical design parameter. We engineer AODD diaphragms with multi-layer Nylon or Polyester reinforcement and FKM, EPDM, or Neoprene rubber compounds to handle aggressive chemical transfer and solvent-heavy fluids. Leak-proof sealing and dimensional stability ensure every stroke delivers the same displacement.
Fuel pump diaphragms operate in continuous contact with petrol, diesel, kerosene, and hydrocarbon blends — media that rapidly degrade standard rubber compounds. We manufacture NBR (Nitrile) diaphragms with excellent fuel resistance, dimensional stability under pressure pulsation, and long-cycle durability for both automotive and industrial fuel systems.
Sprayer pumps handle chemical herbicide and pesticide solutions in outdoor field conditions — requiring diaphragms that resist chemical attack, UV degradation, and wide temperature swings. Our NBR and EPDM reinforced diaphragms deliver reliable sealing and flex life through full spraying seasons.
Air-operated pneumatic pumps and vacuum systems rely on diaphragms for precise pressure and vacuum control. Our fabric-reinforced molded diaphragms provide the structural integrity needed for repeated pressure differentials while maintaining elastic recovery and sealing performance in both positive-pressure and negative-pressure cycles.
Water and wastewater treatment systems demand diaphragms that resist ozone, chlorine, water, and common treatment chemicals. EPDM reinforced diaphragms are our standard recommendation for this sector — providing excellent chemical compatibility, long outdoor service life, and consistent metering accuracy.
- Powers air-operated, mechanical, and metering pumps, supporting diverse pump architectures
- Operates at pressures up to 25 bar, meeting high-pressure pumping demands
- Reinforces with fabric or multi-layer construction, extending fatigue life under continuous reciprocating operation
- Resists water, oils, fuels, and chemicals, protecting pump integrity across industries
- Handles application-specific vacuum conditions, expanding suitability across pump types
Custom Pump Diaphragms for Your Application
- Pump type and stroke geometry
- Operating pressure and pressure differential
- Fluid media and chemical exposure profile
- Temperature range (min and max)
- Required flex life and cycle count
- Reinforcement fabric type and layer count
- Metal insert type, material, and bonding specification
- Mounting configuration and flange dimensions
- Diameter from 1/4" to 55" (and beyond on enquiry)
- Certifications: FDA, REACH, RoHS, NSF-61, IATF 16949
Reinforcement Fabric Options
| Fabric Type | Key Property | Best Used In |
|---|---|---|
| Nylon | High flex fatigue resistance | AODD pumps, dosing pumps |
| Polyester | Dimensional stability | Metering pumps, precision dosing |
| Aramid / Kevlar® | High burst strength | High-pressure transfer pumps |
| Cotton | Economical reinforcement | Low-pressure, general-purpose |
| Nomex® | High temperature resistance | Industrial & thermal process pumps |
Rubber Material Selection Guide
Selecting the correct rubber compound ensures the diaphragm resists your process fluid, operates within your temperature window, and meets your required service life:
| Rubber Compound | Best Chemical Resistance | Temperature Range | Typical Application |
|---|---|---|---|
| NBR (Nitrile) | Oils, fuels, diesel, hydrocarbons | –40 °C to +120 °C | Fuel pumps, automotive, oil & gas |
| EPDM | Water, ozone, steam, weathering | –50 °C to +150 °C | Water treatment, agriculture |
| FKM (Viton®) | Aggressive chemicals, solvents | –20 °C to +200 °C | Chemical processing, oil & gas |
| Silicone | High temp, FDA media, steam | –60 °C to +200 °C | Food processing, pharmaceutical |
| Neoprene | Oils, moderate chemicals, UV | –40 °C to +120 °C | General industrial, AODD |
Key Properties of DS Techno Pump Diaphragms
Long Flex Fatigue Life
High Pressure Capability
Fabric reinforcement allows our diaphragms to withstand pressures up to 2000 psi (136 bar), with differential pressure management from both sides. We engineer burst strength margins into every design to keep your pump running safely under peak load.
Leak-Proof Sealing Performance
Excellent Dimensional Stability
Chemical & Fuel Resistance
We match the rubber compound to your process fluid — NBR for oils and fuels, EPDM for water and ozone, FKM for aggressive chemicals and solvents, Silicone for high-temperature or food-grade media. The right compound prevents swelling, hardening, and chemical degradation.
Metal Insert Availability
For applications requiring structural fastening, load transfer, or specialized mounting, we manufacture pump diaphragms with bonded metal inserts. The insert is fully encapsulated to prevent corrosion exposure and maintain sealing integrity.
Why Choose DS Techno Rubber for Pump Diaphragms?
35+ Years of Rubber Engineering Expertise
DS Techno Rubber has been designing and manufacturing technically complex rubber components for over three and a half decades. Our engineering team understands the failure modes of pump diaphragms and builds designs that last.
Our production facility operates under IATF 16949 quality management — the automotive-grade standard that governs our process control, inspection, and traceability. Every pump diaphragm leaves our facility having passed dimensional and pressure validation.
Fabric & Metal Reinforcement Capability
Precision Moulding to Tight Tolerances
Our compression and transfer moulding processes deliver pump diaphragms to exacting dimensional tolerances. Consistent geometry means consistent stroke volume, sealing force, and service life.
Custom Pump Diaphragms for Your Needs
Get in touch today to discuss custom Custom Pump Diaphragms tailored to your precise needs!
FAQ
FKM (Viton) and PTFE-faced diaphragms are the standard choice for chemical pump applications because of their outstanding resistance to aggressive solvents, acids, and corrosive process fluids. For general water-based chemical systems, EPDM is commonly used.
Reinforced rubber diaphragms are commonly used in AODD (air-operated double diaphragm) pumps, dosing pumps, metering pumps, fuel pumps, chemical transfer pumps, agricultural sprayer pumps, pneumatic pumps, and vacuum pumps.
Pump diaphragms are reinforced with Nylon (high flex fatigue resistance), Polyester (dimensional stability), Aramid / Kevlar (high burst strength), Cotton (economical option), and Nomex (high temperature performance). The selection depends on operating pressure, temperature, and required flex life.
Get a Custom Quote
Tell us your pump type, process fluid, operating pressure, and temperature range — and our engineering team will respond with a compound recommendation, reinforcement specification, and price indication within 24 hours.