Product Overview
Reliable custom rubber parts for industrial applications
Quick Answer
This rubber vacuum diaphragm range includes four molded profiles for automotive and industrial control systems: flat-flange disc, tall conical funnel, low conical bowl and dome-cap designs. NBR, EPDM, CR and NR compounds are available. Flange dimensions, wall thickness, spigot bore, Shore A hardness, tolerances and packaging can be customized.
Product Overview
Rubber vacuum diaphragms are flexible elastomeric membranes that convert pressure differential into controlled mechanical displacement. As critical components in vacuum-operated control systems, they must maintain consistent flexibility across the operating temperature range, provide reliable sealing at the housing flange interface and withstand cyclic pressure loading. This product range includes four molded profiles for different housing geometries, actuation strokes and pressure levels in automotive and industrial applications. The diaphragms are manufactured from automotive-grade rubber compounds with controlled Shore A hardness, consistent membrane wall thickness and flash-free critical sealing surfaces. Custom dimensions can be reviewed according to 2D drawings, 3D models or physical samples.
Key Features
- Four molded diaphragm profiles for different housing geometries and actuation requirements.
- Available rubber compounds: NBR, EPDM, CR (Chloroprene) and NR.
- Controlled Shore A hardness according to the required flexibility and pressure response.
- Consistent membrane wall thickness for repeatable actuation performance.
- Critical flange and sealing surfaces manufactured for reliable housing interface sealing.
- Custom flange diameter, wall thickness, dome height, spigot bore and overall height available.
- Suitable for automotive control systems, industrial automation and replacement kits.
- Custom compound formulations, dimensional tolerances and assortment packaging available upon request.
Product Specifications
| Specification | Details |
|---|---|
| Product Name | Rubber Vacuum Diaphragm |
| Material | NBR, EPDM, CR (Chloroprene) and NR options available according to the selected profile and application conditions |
| Hardness | 40–60 Shore A, depending on the selected profile |
| Color | Available upon request |
| Manufacturing Process | Rubber molding |
| Application | Vacuum-operated automotive and industrial control systems |
| Customization | Profile type, flange OD, flange thickness, membrane wall thickness, dome height, spigot OD, spigot ID, overall height, rubber compound, Shore A hardness, dimensional tolerance and packaging can be reviewed according to the drawing and application requirements. |
| MOQ | Contact us for details |
| Tooling | Tooling cost depends on the drawing and product structure |
| Sample Availability | Available upon request |
| Lead Time | Available upon request |
| Compliance Options | Available upon request |
Product Variants
Type A — Flat-Flange Disc Diaphragm
Type A is a shallow-bowl membrane with a wide flat sealing flange and a raised center actuation boss. The wide flange provides a large clamping area in split-body housing assemblies. This supports perimeter sealing while the shallow bowl flexes under vacuum actuation. The center boss accepts a push-rod or valve stem for direct mechanical output.
| Specification | Details |
|---|---|
| Profile Structure | Shallow bowl, wide sealing flange and center actuation boss |
| Material Options | NBR / EPDM |
| Hardness | 50–60 Shore A |
| Wall Thickness Consistency | ±0.15 mm |
| Actuation Characteristics | Suitable for low-stroke, large-area actuation applications |
- Wide flat flange for positive clamping seal in split-body housings.
- Center boss for push-rod or valve stem interface.
- Consistent membrane wall thickness for repeatable displacement.
- Suitable for fuel pressure regulators, MAP sensor isolation membranes, EGR valve vacuum actuators, carburetor vacuum advance diaphragms and pneumatic control valve sensing membranes.
Type B — Tall Conical Funnel Diaphragm
Type B has a high-profile conical funnel body, a wide flat base flange and a top-mounted outlet spigot. The tall sidewall geometry supports a longer linear actuation stroke within a compact housing diameter. This profile is suitable for installations where increased travel is required but the available housing diameter is limited.
| Specification | Details |
|---|---|
| Profile Structure | Tall conical body, wide flat base flange and top outlet spigot |
| Material Options | NBR / CR (Chloroprene) |
| Hardness | 45–55 Shore A |
| Fatigue Rating | 500,000+ vacuum cycles |
| Actuation Characteristics | Designed for longer linear actuation stroke |
- Tall conical sidewall enables long linear actuation stroke.
- Top spigot interfaces directly with a vacuum hose or port fitting.
- Wide base flange clamps securely in the housing groove.
- Suitable for brake vacuum booster check valve membranes, turbocharger wastegate vacuum actuators, intake manifold vacuum servos, vacuum-operated HVAC blend door actuators and industrial vacuum pump inlet valves.
Type C — Low Conical Bowl Diaphragm
Type C is a compact low-profile conical bowl with a wide base sealing flange and a small-diameter outlet spigot. Its reduced height is suitable for space-constrained assemblies where the taller Type B structure cannot be accommodated. The conical wall angle supports repeatable actuation travel throughout the service life.
| Specification | Details |
|---|---|
| Profile Structure | Short conical bowl, wide base flange and small outlet spigot |
| Material Options | EPDM / NBR |
| Hardness | 45–55 Shore A |
| Actuation Characteristics | Compatible with low-to-medium vacuum pressure levels |
| Installation Advantage | Low-profile structure for space-constrained housings |
- Low-profile form factor for compact packaging environments.
- Small-bore outlet spigot for direct push-fit hose connection.
- Consistent conical wall angle for repeatable actuation travel.
- Suitable for EGR vacuum solenoids, secondary air injection control valves, EVAP purge valves, vacuum-actuated idle-speed controls and small pneumatic valves used in industrial automation.
Type D — Dome Cap / Blind Plug Diaphragm
Type D is a compact hemispherical dome cap with a retaining flange for snap-fit or interference-fit installation over vacuum ports, sensor nipples and test points. It can be used as a protective end cap during shipping and handling or as an installed port-blanking or low-pressure relief membrane. The dome geometry provides calibrated flex at the apex under low differential pressure.
| Specification | Details |
|---|---|
| Profile Structure | Hemispherical dome body with compact retaining flange |
| Material Options | NR / EPDM |
| Hardness | 40–50 Shore A |
| Installation Method | Snap-fit or interference-fit installation |
| Environmental Resistance | Designed for resistance to ozone, UV and ambient moisture |
- Hemispherical dome flexes predictably under low differential pressure.
- Small retaining flange for snap-fit or interference-fit installation.
- Dual-purpose use as a shipping cap and installed service component.
- Suitable for vacuum port protection, sensor nipple covers, test-point covers, low-pressure relief membranes, manifold blanking plugs and engine vacuum circuit service-port covers.
Material Selection Guide
| Compound | Temperature Range | Compatible Media | Recommended Applications |
|---|---|---|---|
| NBR | -40°C to +120°C | Fuel, oil and hydraulic fluid | Fuel-system and oil-circuit diaphragms |
| EPDM | -50°C to +150°C | Coolant, brake fluid, water and air | Brake-booster, HVAC and emission-control components |
| CR (Chloroprene) | -40°C to +120°C | Ozone, weather exposure and mild chemicals | Underhood and outdoor-exposed components |
| NR | -50°C to +80°C | General-purpose air applications | Low-pressure pneumatic systems and protective caps |
Applications
Rubber vacuum diaphragms are used in control systems that convert vacuum or pressure differential into mechanical movement. Automotive applications include braking systems, emission-control systems, fuel systems, HVAC actuators and powertrain components. Industrial applications include pneumatic control valves and vacuum pump inlet valves. Agricultural machinery applications can include hydraulic valve diaphragms and vacuum seeder control components. The correct diaphragm profile should be selected according to the available housing height, flange structure, required actuation stroke, pressure level, operating temperature and contact media.
| System / Industry | Applicable Diaphragm Types | Typical Components |
|---|---|---|
| Automotive — Braking | Type B | Brake vacuum booster and master-cylinder check valve components |
| Automotive — Emission Control | Type A, Type C | EGR valve, EVAP purge valve and secondary air injection components |
| Automotive — Fuel System | Type A | Fuel pressure regulator and carburetor vacuum advance components |
| Automotive — HVAC | Type B, Type C | Blend-door actuator and vacuum servo components |
| Automotive — Powertrain | Type A, Type B | Wastegate actuator and intake-manifold vacuum servo components |
| Service and Maintenance | Type D | Vacuum port caps and test-point blanking plugs |
| Industrial Automation | Type B, Type C | Pneumatic control valves and vacuum pump inlet valves |
| Agricultural Machinery | Type A, Type C | Hydraulic valve diaphragms and vacuum seeder controls |
Customization Options
Custom rubber vacuum diaphragms can be developed according to 2D drawings, 3D models or physical samples. Buyers can specify the profile type, flange OD, flange width, flange thickness, membrane wall thickness, bowl depth, dome height, spigot OD, spigot ID, center boss structure, rubber compound, Shore A hardness and dimensional tolerance. Material selection depends on temperature, vacuum pressure, pressure differential, contact media, stroke length and cycle frequency. Custom compound formulations, assortment packaging and replacement-kit packaging are available upon request. Tooling cost depends on the drawing and product structure.
What Information Should Buyers Provide for a Quote?
- Product drawing, OEM part number or physical sample
- Required diaphragm profile: Type A, Type B, Type C or Type D
- Dimensions and tolerances
- Flange OD, flange width and flange thickness
- Membrane wall thickness
- Spigot OD and ID, if applicable
- Rubber material
- Shore A hardness
- Operating temperature
- Contact media
- Vacuum pressure range and pressure differential
- Required actuation stroke
- Cycle-frequency requirement
- Required quantity
- Estimated annual volume
- Compliance requirements
- Packaging requirements
Why Choose This Rubber Vacuum Diaphragm Range?
- Four profiles in one range: flat-flange disc, tall conical funnel, low conical bowl and dome-cap designs cover different automotive and industrial vacuum housing geometries.
- Multi-compound availability: NBR, EPDM, CR and NR compounds can be matched to specific temperature and media-compatibility requirements.
- Controlled dimensional consistency: wall thickness and flange geometry can be reviewed according to the sealing and actuation requirements.
- Custom dimensions: outer diameter, flange width, wall thickness, dome height and spigot bore can be produced according to customer drawings.
- Dual-purpose dome cap: Type D can function as a protective shipping cap and as an installed service component.
- OEM and replacement supply: all profiles can be reviewed for OEM Tier-2 supply and aftermarket replacement kits.
FAQ
How do I select the correct rubber vacuum diaphragm profile?
Profile selection depends on the available housing height, required actuation stroke and installation function. Type A is suitable for short-stroke applications. Type B supports longer travel. Type C is designed for compact housings. Type D is used for port protection, blanking or low-pressure relief functions. Submit your housing drawing for technical review.
What is the maximum vacuum pressure rating?
The operating vacuum pressure range depends on the membrane wall thickness and compound hardness. Standard profiles are rated for 0–90 kPa vacuum. For elevated pressure or high-cycle applications, reinforced compound options can be reviewed according to the required operating conditions.
Can the flange dimensions be customized to match an existing housing?
Yes. All four profiles are available with custom flange OD, flange thickness, spigot OD, spigot ID and overall height. Please submit your housing drawing, OEM part number or existing diaphragm sample so the interface dimensions and tolerance requirements can be evaluated.
Are EPDM diaphragms compatible with DOT 3 and DOT 4 brake fluid?
EPDM compound diaphragms are recommended for applications involving DOT 3 and DOT 4 glycol-ether brake fluids. Please provide the complete fluid specification, operating temperature, pressure differential and application drawing so the compound requirements can be confirmed before production.
Are prototype samples available?
Prototype samples are available upon request. Sample planning depends on the selected diaphragm profile, rubber compound, dimensions, hardness, tooling requirements and order quantity. Please send your drawing, OEM part number or physical sample for engineering review.
What are the MOQ and production lead time?
MOQ and lead time depend on the diaphragm profile, compound, tooling status, dimensional tolerance, inspection requirements and order quantity. Contact us for details and provide the required delivery schedule, prototype quantity and estimated annual volume for quotation review.
Request a Custom Quote
All four rubber vacuum diaphragm profiles are available for OEM Tier-2 supply and aftermarket replacement kits. Send your OEM part number, 2D drawing, 3D model or physical sample for engineering review. Please include the dimensions, compound requirements, vacuum pressure, stroke length, cycle frequency, required quantity, estimated annual volume and packaging requirements.
