This is a rubber diaphragm engineered for diaphragm pumps. It is made of HNBR. It features a disc-shaped stepped profile with an overall circular structure. Its surface adopts a multi-layer stepped concave design (with a circular hole in the center and an arc-shaped edge on the outer ring). Small positioning protrusions are embedded on the side. Its hardness is 65–70°. It is flexible and resilient. It perfectly fits the cavity mounting position of pneumatic diaphragm pumps.As a core power and sealing component for fluid transfer equipment, it complies with the stringent standards of Diaphragms & Sealing Gaskets and Pressure Seal Components. It is fully compatible with the application requirements of Sealed Diaphragm Pump and Sealed Fluid Transfer Pump.
Product Features
1. Functions
1)Core Power Transmission for Pneumatic Diaphragm PumpsIt serves as a vital component of the pump body. It converts the pressure of the pneumatic end into fluid transfer power through its reciprocating deformation. It drives the suction and discharge of media (liquids, slurries) in the pump cavity. It achieves stable medium delivery. This power transmission performance meets the rigorous demands of Micro Sealed Hydraulic Pump and high-efficiency fluid transfer systems.
2)Pump Cavity Sealing and IsolationIt tightly fits the inner wall of the pump cavity and linkage components. It separates the pneumatic chamber from the medium chamber. It prevents compressed air leakage. It avoids backflow of the transferred medium or infiltration into the pneumatic end that may cause component damage.
3)Adaptation to Pump Reciprocating MotionIt leverages the elasticity and hardness characteristics of HNBR material. It adapts to the high-frequency reciprocating motion of pneumatic diaphragm pumps. It ensures continuous and stable operation of the pump body. It reduces component wear during movement.
2. Performance Characteristics
1)HNBR Material + 65–70° Hardness Balances Elasticity and DurabilityHNBR (Hydrogenated Nitrile Butadiene Rubber) boasts excellent oil resistance, wear resistance and tear strength. Compared with ordinary NBR, it has better resistance to high and low temperatures (able to withstand working conditions ranging from -40℃ to 150℃). The 65–70° medium-high hardness setting retains sufficient elasticity for reciprocating deformation and sealing fit. It avoids plastic deformation or damage caused by long-term high-frequency reciprocating motion. It extends the service life of the diaphragm. This performance advantage aligns with the technical specifications of Fluid-Tight Diaphragms and heavy-duty fluid sealing components.
2)Stepped Structure + Positioning Protrusions Enhance Assembly and Operation StabilityThe multi-layer stepped concave design precisely matches the inner wall of the pump cavity. It increases the sealing contact area and improves sealing reliability. The positioning protrusions on the outer ring can be embedded into the pump body mounting groove. It prevents the diaphragm from shifting or deflecting during reciprocating motion. It ensures power transmission efficiency and pump operation stability. This structural design complies with the matching standards of Sealing Elements for Valves and integrated diaphragm pump systems.
3)Medium Corrosion Resistance for Multi-Working Condition TransferIt has good tolerance to oily media such as fuel oil, lubricating oil and hydraulic oil, as well as water, acid-base solutions and industrial slurries. It is not prone to swelling, aging or degradation. It meets the transfer requirements of complex media.
3. Application Scenarios
1)Industrial Fluid TransferIt is suitable for pneumatic diaphragm pumps in the chemical, petroleum and machinery processing industries. It is used for transferring lubricating oil, diesel, chemical solvents, acid-base slurries and other media. It is a key part of Sealed Fluid Transfer Pump systems in industrial fluid handling.
2)Mining and Sewage TreatmentIt is applicable for mining sewage pumps and sewage treatment diaphragm pumps. It transfers sewage, mineral slurry and other media containing sediment and impurities. It withstands wear from impurity particles. It complies with the durability requirements of Pressure Seal Components in harsh working environments.
3)Food and Pharmaceutical Auxiliary TransferIt can be used in food-grade pneumatic diaphragm pumps (food-grade HNBR material is required). It transfers edible oil, sauces and other media. It meets the requirements of low-pollution transfer. It aligns with the safety standards of Gasket & Membrane Assemblies for food-contact equipment.
4. Pain Point Solutions
1)Solving Poor Oil Resistance of Ordinary DiaphragmsOrdinary rubber diaphragms are prone to swelling and aging when in contact with oily media. It leads to pump leakage or power transmission failure. The oil resistance of HNBR material enables adaptation to oily medium transfer. It greatly reduces the frequency of diaphragm replacement. It optimizes the service life of Sealed Diaphragm Pump components.
2)Addressing Wear and Damage Under High-Frequency Reciprocating MotionLow-hardness diaphragms are prone to deformation and tearing during long-term reciprocating motion. High-hardness diaphragms lack sufficient elasticity to fit the pump cavity. The 65–70° hardness balances elasticity and wear resistance. It enables it to withstand the high-frequency motion of pneumatic diaphragm pumps. It extends equipment maintenance cycles. It improves the reliability of Micro Sealed Hydraulic Pump auxiliary diaphragms.
3)Resolving Poor Pump Cavity SealingSmooth flat diaphragms have poor fit with the pump cavity. They easily cause medium backflow or air leakage. The stepped structure increases the sealing contact surface. The positioning protrusions prevent displacement. It completely solves the problem of pump efficiency reduction caused by sealing failure. It enhances the performance of Fluid-Tight Diaphragms in diaphragm pump systems.
4)Solving Poor Adaptability Under Complex Working ConditionsOrdinary diaphragms are difficult to meet the requirements of high-low temperature resistance and multi-medium transfer. The weather resistance and medium resistance of HNBR material enable adaptation to complex and harsh working conditions such as industry and mining. It improves the versatility of the pump body. It meets the diverse demands of Sealing Elements for Valves in fluid control systems.
