Product Overview
Our rubber diaphragms are precision-engineered dynamic sealing components designed for reciprocating pumps, valves, actuators, and regulators. Manufactured from high-quality rubber compounds with or without fabric reinforcement, Chengda diaphragms provide reliable flex life, pressure resistance, and media compatibility across demanding industrial environments.
Key Features
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Excellent Flex Fatigue Resistance – Withstands millions of pressure cycles without cracking or permanent deformation.
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Fabric-Reinforced Option – Cloth-reinforced design delivers higher tensile strength and burst resistance for high-pressure applications.
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Wide Media Compatibility – Available in NBR, EPDM, FKM/Viton®, silicone, and other elastomers to handle oils, fuels, water, chemicals, and food-grade fluids.
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Precision Molding – Tight thickness control and smooth surface finish ensure consistent sealing performance.
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Customizable Geometry – From flat, convoluted, and rolling diaphragms to complex molded shapes with embedded inserts or studs.
Typical Applications
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Air-operated double-diaphragm (AODD) pumps
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Fuel transfer pumps and carburetors
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Chemical dosing and metering pumps
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Pressure regulators and control valves
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Water treatment equipment
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Automotive brake boosters and emission systems
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Medical devices and analytical instruments
Available Materials
| Material | Temperature Range | Key Properties |
|---|---|---|
| NBR (Nitrile) | -30°C ~ +100°C | Oil, fuel, and abrasion resistant |
| EPDM | -40°C ~ +120°C | Excellent for hot water, steam, and brake fluids |
| FKM (Viton®) | -20°C ~ +200°C | Superior chemical and high-temperature resistance |
| Silicone | -50°C ~ +200°C | Flexible at low temp, FDA grade available |
| Cloth-Reinforced (Nitrile/EPDM base) | Depends on rubber | High burst strength and dimensional stability |
Customization Options
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Size: Outer diameter from 5mm to 800mm
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Thickness: 0.5mm to 10mm (or as required)
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Fabric type: Polyester, nylon, aramid, etc.
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Hardness: 40 Shore A to 90 Shore A
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Color: Black, white, or custom
Quality Assurance
Each diaphragm is manufactured under strict quality control following ISO standards. From raw material incoming inspection to in-process dimensional checks and final functional testing, we guarantee consistent quality for every batch.
Ordering Information
Please provide your drawing, sample, or performance requirements. Our R&D team will recommend the optimal material and design. Prototypes available within 3–7 days.
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