Molded Rubber Diaphragm
- YiDa
- Dalian,China
- 15-20 days
- 2 billion/year
Molded rubber diaphragms are manufactured through a high-temperature, one-step molding procedure, which creates a compact and homogeneous material without any seams. Being the major elastic, pressure-bearing parts of diaphragm pumps, pneumatic valves, and metering pumps, they come with high tearing strength, very good resistance to the continuous flexing, highly dependable sealing performance, and remarkable longevity.
After many cycles of operation, rubber diaphragms may experience delamination (detachments of the rubber from the inner fabric reinforcement) or fatigue cracking in the spots where bending stress is highest. Such a malfunction of the diaphragm will cause an immediate disappearance of pump pressure and release of the media, which might even stop the entire production. The costs of the replacement and downtime may be much higher than the value of the diaphragm alone.
Solution:
At the molecular level, chemical bonding: We don't stop at just "sandwich" building; rather, we use a chemical reaction between a special fabric surface treatment (RFL dipping) and the rubber compound. Rubber molecules get directly inside the fibers and are mechanically locked during molding and vulcanization, resulting in genuine merging of the rubber and the reinforcement structure. The peel strength is still ≥ 8 N/mm after very hard and frequent bending, thereby the risk of delamination is almost nil.
Precision stress-line positioning: Our precision-molded rubber diaphragms implement highly precise mold designs to guarantee the reinforcement material (like nylon or Kevlar) is placed right along the diaphragm's neutral stress axis.
This effectively eliminates stress concentrations due to reinforcement misalignment, which would have led to very thin rubber parts on one side.
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Rubber diaphragm specifications:
| Attribute Name | Details |
| Processing Service | Cutting/Molding |
| Brand Name | EDA |
| Model Number | As per client's drawing |
| Material | NBR, EPDM, Silicone, FKM, SBR, NR, etc. |
| Hardness Range | 50 - 85 Shore A |
| OEM/ODM Service | Custom molding available based on drawings, samples, or pump models; options include fabric-reinforced structures, thickened wear-resistant versions, and corrosion-resistant types; stable volume supply. |
| Color | Optional |
| Operating Temperature | -40°C to 260°C |
| Shape | Styles: Circular, bowl-shaped, corrugated, flat, irregular, flanged (customizable) |
| Size | Customizable diaphragms (circular, irregular, with holes, flanged, etc.); supports various thicknesses, hardness levels, and aperture sizes; compatible with major brands of pneumatic/electric diaphragm pumps, metering pumps, vacuum equipment, and pneumatic actuators. |
| Reinforcement Fabric | Nylon, Polyester, cotton canvas, Nomex, or Kevlar fibers. |
| Burst Pressure | Up to 5.0 MPa (depending on the number of fabric layers and thickness design). |
| Tear Strength | ≥ 30 kN/m. |
| Surface Coating | Optional PTFE (Teflon) facing for chemical corrosion resistance. |
| Tolerance Standard | As per customer design |
| Quality | 100% Inspection |
| Design Format | 2D & 3D drawings available |
| Supports Common International Standards | Customized according to customer drawings or OEM standards. |
| Performance Characteristics | 1. One-piece molded construction: High structural integrity, resistant to delamination or cracking, and offers excellent sealing performance when correctly installed. |
| 2. High-frequency reciprocating performance: It can resist fatigue and deterioration even when folding repeatedly; provides extended use life. | |
| 3. Tear and tensile resistance: High toughness; can stand up to erosion from media with fine particles and will still resist damage. | |
| 4. Same thickness throughout:Highly accurate molding can provide very stable stroke and pumping flow. | |
| 5. Temperature and chemical resistance: It works well with different types of fluids and does not easily swell, harden or age. | |
| 6. Precise fit: Accurate curvature ensures a tight seal against the pump chamber, preventing pressure or fluid leakage. | |
| (Depends on the concentration and particle size of the grinding media) | |
| Main Application Areas | Pneumatic diaphragm pumps, electric diaphragm pumps, metering pumps, vacuum pumps, water treatment equipment, chemical transfer pumps, food transfer equipment, pneumatic control valves, hydraulic diaphragm assemblies are some examples. |
| Warranty | Under recommended storage conditions (temperature <30°C, humidity <70%, away from direct light), unopened products are eligible for free replacement if material aging or failure occurs—through no fault of the user—within three years of the delivery date, subject to verification. Failures caused by improper installation or use beyond specified limits are not covered by the warranty. |
| Production Capacity | Monthly production exceeds 300 tons. |
| Lead Time | 15 days after order confirmation for standard sizes. Typically, it takes about 1-2 weeks to produce prototypes or first-article samples; if molds have to be developed, the running time of the production mold is 10 days; and, on average, it takes about 2-3 weeks for the ordered goods to be ready for delivery after sample approval. |
| Packaging | Packed in PE bags, then placed in cartons |
| Selling Units | Single unit (1 pc) |
| Single Package Size | As per the buyer's request |
| Single Gross Weight | As per the buyer's request |
| Shipping Method | By sea, air, or express |
| Port of Loading | Dalian Port or as per the buyer's request |
| Certificates | IATF 16949 Automotive Industry Quality System |
| AS9100D Civil Aviation Quality System | |
| ISO 14001 | |
| ISO 9001 | |
| ROHS 2.0 |
Technical Advantages:
Reverse Analysis: Database material matching based on over 1,000 confirmed formula entries, with the possibility of tailoring according to different media, temperatures, and operating conditions.
Raw Material Property Testing: Barcode-based automatic error prevention system as well as using imported raw materials are the main reasons for consistency and stability of the products. The company has also a mold machining center.
Over 20 years of experience; Makino machining centers and EDM machines ensure mold precision within 0.005mm.
AI-Powered Visual Quality Inspection: Complete performance testing of materials, CPK, SPC, and MSA analyses, AI-based visual inspection, 2D inspection, and fully manual inspection.
Manufacturing Center:
Rubber compounding
Vulcanization
Mold
Injection molding
Testing Center:
Materials analysis equipment
Automatic inspection equipment
About Yida:
Founded in 1993 and backed by Dalian Yida Precision Rubber Products Co., Ltd. established in 2006, Yida is an industrial rubber manufacturer with more than two decades of experience. The company, which is based in Dalian, has a staff of over 450 and a production area of 37,000 sq. m. In addition, Yida has set up factories in Vietnam and Japan. Having over 1,000 compound formulations tested and a monthly production capacity of more than 300 tons, the company can provide steady, large-scale delivery. It sells its products to the United States, Germany, Saudi Arabia, Russia, Mexico, Japan, Thailand, the UAE, France, and Vietnam.
Certifications:
Yida holds certifications including IATF16949, ISO9001, ISO14001, AS9100D, RoHS 2.0, UL, and NSF/WRAS.
Certificate Numbers:
AS9100D & ISO 9001:2015
Key Partners:
Yida keeps on delivering trustworthy products and services to clients from different parts of the world. The company works in diverse sectors including industrial manufacturing, automation control, new energy, electrical equipment, and automotive components. By forming long-term partnerships with many internationally famous companies, Yida has become a global brand. Our clients are a very diversified group of industries - from automotive electronics, industrial automation, intelligent manufacturing, new energy, power equipment to fluid control. Some notable companies we have worked with are Delphi Technologies, Alpine Electronics, Nidec, Siemens, Panasonic, Omron, SMC Corporation, CATL, China Electric Equipment Group and Rongke Power.
14th Shanghai International Long-Duration Energy Storage Technology Conference.
Participating in this broad industry conference at a high level allowed Yida to present its capability of providing rubber sealing components for new sectors like flow batteries on a distinguished platform and as a result, the company gained increased recognition in the industry and its brand influence grew.
