Medical Rubber-Coated Metal Diaphragm

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Product details

This is an medical rubber-coated metal diaphragm. It’s made for pump valves of laboratory analytical instruments in the healthcare industry. It’s a core functional part of Pump Valves and Sealing Parts for Testing Equipment and Testing Instrument Sealing Parts.It has an overall flat shape, almost like an oval. This shape fits the installation space of pump valves in laboratory analytical instruments. It makes sealing and functional movements easy in small spaces. It uses a clear multi-layer nested design. The outer layer is a bigger oval rubber frame. Inside this frame, there are rubber layers that get smaller in size step by step. These layers nest together to form a stepped 3D structure. This structure lets it fit precisely with the corresponding chambers and parts of the pump valve. It makes the sealing more stable.The central area has an opening. A metal part is embedded inside this opening. The opening lets media like liquids and gases flow through. The embedded part makes the central region of the diaphragm stronger and stiffer. This makes sure the diaphragm’s shape changes in a controlled way when the pump valve is working. It keeps the sealing and functional performance stable.The rubber layers are made of high-performance medical silicone seal material. It meets the strict performance standards of Detection Device Seals. It gives reliable support to the precise fluid control in laboratory analytical instruments.

Product Features

1. Functions

1)Dynamic Sealing:Pump valves move back and forth. Like the diaphragm in diaphragm pumps being pressed repeatedly, or the valve core in solenoid valves opening and closing. During these movements, the diaphragm fits tightly against the sealing surface. It stops liquids (like testing reagents and sample solutions) and gases from leaking. This keeps the pressure inside the pump valve chamber stable. It makes sure reagents and samples are transferred in precise volumes. This is very important for laboratory analytical instruments. They need to load and deliver tiny amounts of samples accurately. For example, in biochemical analyzers, it controls the mixing ratio of samples and reagents. Its dynamic sealing performance is as good as the high-precision sealing capabilities of Medical Device Seals and Sterile Medical Seals in important fluid systems.

2)Media Isolation:It separates different functional areas and media inside the pump valve. Like reagent channels and driving fluid channels, or sample channels and cleaning fluid channels. This stops cross-contamination. It also protects the pump valve’s mechanical parts (like motors and valve cores) and electronic elements. They won’t be corroded by chemical reagents. This makes the pump valve and the whole instrument last longer. For instance, in immunoassay instruments, it stops high-activity antigen-antibody reagents from contaminating other internal parts of the instrument. Its isolation effect matches the hygiene and protection standards of Lab Equipment Gaskets in laboratory environments.

3)Pressure Transmission and Control:It uses its own elastic deformation. It works with the pump valve’s mechanical structure. Together, they precisely adjust the flow rate and pressure of liquids or gases. For example, in diaphragm pumps, the diaphragm’s deformation changes the pump chamber volume. This lets the pump deliver liquids. In pressure-controlled pump valves, the diaphragm can send back pressure signals. This helps the pump valve adjust the output pressure and flow rate accurately. This meets the strict requirements of laboratory instruments for fluid transmission parameters. It also helps with the functional precision of Testing Pump Valves.

2. Required Characteristics

1)Superior Sealing Performance:It must have a very low leakage rate. For liquids, the leakage usually needs to be controlled in a tiny range—like less than 0.01mL every hour. This has to happen under different pressure environments. Like low pressure (such as the slight pressure of micro-pumps) and high pressure (such as the high pressure of liquid chromatography pumps). Its sealing performance stays stable during long-term use. No sealing failure happens because of fatigue, deformation, or other factors. This makes sure instrument test results aren’t affected by leakage. Its sealing reliability is as good as that of Medical Vial Cap Seals and high-end Medical Grade Silicone Seals.

2)Chemical Erosion Resistance:It must stand the complex and different chemical media in laboratories. Like strong acids, strong alkalis, organic solvents, and biological samples (that have proteins, nucleic acids, etc.). After touching these media for a long time, it must have a low volume change rate. Usually, this rate needs to be less than 3. It won’t swell, crack, or have material getting worse. It also won’t release harmful substances that contaminate samples or reagents. This makes sure test results are accurate. It also makes the diaphragm suitable for different biochemical, immunoassay, and molecular biology testing instruments. This chemical stability meets the material standards of Pump Valves and Sealing Parts for Testing Equipment in harsh laboratory conditions.

3)Fatigue Resistance:It must stand high-frequency back-and-forth movements and pressure changes. For example, solenoid valve diaphragms may open and close dozens to hundreds of times every minute. It must have a high cycle life. For example, diaphragm pump diaphragms usually need to go through more than 1 million cycles. During long-term use, it must resist tearing and wear. Its surface and internal microstructures stay stable. No cracks, debris falling off, or other issues happen. These issues would affect sealing and instrument operation. This durability meets the service life requirements of Testing Instrument Sealing Parts in high-intensity use scenarios.

4)Precise Dimensional Stability:Its dimensional tolerances must be strictly controlled. For example, critical dimensional tolerance needs to be within ±0.05mm. After environmental changes—like high-temperature sterilization (such as 121℃ moist heat sterilization, a common laboratory method) and low-temperature refrigeration (some samples and reagents need low-temperature storage, so instruments may be in low-temperature environments)—its dimensional change must be tiny. Usually less than 1%. This makes sure it stays compatible with the precision parts of the pump valve for a long time. It avoids problems like jamming and poor sealing caused by dimensional changes. This stability matches the precision requirements of Detection Device Seals.

5)Biocompatibility:It must meet medical-grade biosafety standards. Like the ISO 10993 series standards. When it touches biological samples (like blood, body fluids, cells, nucleic acids, etc.), it must not change the sample’s composition. It won’t cause immune reactions. It also won’t adsorb bioactive substances in the sample. This makes sure test results truly show the sample’s condition. It makes the diaphragm suitable for laboratory analytical instruments that test biological samples. This biocompatibility is a basic requirement for Medical Grade Silicone Seals and Sterile Medical Seals that touch biological materials.

6)Elasticity and Rigidity Compatibility:Its elasticity must meet the needs of pressure transmission and sealing deformation. At the same time, structures like the central embedded part must have a certain degree of rigidity. This makes sure the diaphragm’s deformation is controlled when the pump valve is working. It lets the pump valve adjust flow rate and pressure precisely. It also lets the diaphragm bounce back to its original shape quickly to keep sealing. This balance between elasticity and rigidity makes sure the pump valve works stably and accurately. It also helps with the mechanical performance of Lab Equipment Gaskets and Testing Pump Valves.