Core Strengths 

 1. Excellent sealing performance 

 As the only sealing element, the diaphragm adopts rubber, PTFE, PFA and other elastic corrosion-resistant materials to achieve a "zero leakage" design, especially suitable for strong acid, strong alkali, toxic or flammable media (such as concentrated sulfuric acid, electroplating liquid). For example, the fluorine diaphragm valve has a temperature resistance range of -50°C to 175°C, and its corrosion resistance can resist 99% chemical media. 

 The packing-free structure completely avoids the risk of leakage, meets the sterile standards of the pharmaceutical and food industries (such as GMP certification) to ensure that the medium is pure and pollution-free. 

 2. Corrosion resistance and material adaptability 

 The valve body lining is made of cast iron/stainless steel + fluoroplastics (such as PTFE/PFA) or rubber. The diaphragm material can be customized (such as EPDM alkali resistance and Viton high temperature resistance) to meet the full-scene needs of weak acid to highly corrosive media. 

 In sewage treatment, corrosive sewage such as chlorine and sulfide can be tolerated; in the semiconductor industry, PFA diaphragm valves are used in ultra-pure water systems to ensure metal-free ion precipitation. 

 3. Flowway design and low resistance characteristics 

 The runner of linear through structure (such as weir diaphragm valve) is smooth, with small flow resistance and high CV value. It is suitable for suspended particles, slurry or viscous fluids (such as food s and coatings) to avoid blockage problems. When fully opened, a dead-free channel is formed to reduce the risk of residue and pollution. 

 4. Maintain convenience and economy 

 The diaphragm can be quickly replaced on site (such as manual diaphragm valve replacement time ≤ 30 minutes), and there is no need to remove the valve body to reduce maintenance costs. The pneumatic diaphragm valve supports modular design, which can attach feedback signals, locators, and adapt to the automatic control system. 

 The structure is simple (only the valve body, diaphragm and valve cover), few parts, low failure rate, and significant long-term use cost advantages. 

 5. Flexible operation and safety protection 

 It supports manual, pneumatic and electric drive. The pneumatic model can switch the handwheel operation when the air source fails to ensure emergency opening and closing. The stem is completely isolated from the medium to avoid the corrosion of the driving parts by the corrosive medium and prolong the life of the equipment. 

 The central role 

 1. Accurate fluid control 

 As a truncated valve or regulating valve, the switching/throttling control of flow and pressure is widely used in chemical processes, water treatment, and food processing (such as beverage production lines, pharmaceutical reactor feeding). 

 Fast opening characteristics (60% of the pre-travel approximate linearity) are suitable for fast opening and closing scenarios, such as emergency cut-off and batch operation. 

 2. Media isolation and pollution prevention 

 Isolate different fluids (such as chemical raw materials and washing water) in multi-media pipelines to prevent cross-contamination. In biopharmaceuticals, the dead angleless design of the diaphragm valve facilitates CIP (in situ cleaning) and SIP (vapor sterilization), which meets the requirements of sterile production. 

 3. Adaptability of special working conditions 

 Vacuum system: The elasticity of the diaphragm can adapt to the negative pressure environment and avoid the problem of traditional valve vacuum leakage. 

 High-temperature/high-pressure scenario: Some models (such as lining diaphragm valve) have a pressure resistance of PN16 and a temperature resistance of 180°C, which is suitable for high-temperature steam and hot oil pipelines. 

 Viscose/particle medium: The runner design reduces congestion, such as sludge in sewage treatment and crystalline slurry in chemicals. 

 4. Environmental protection and security 

 Reduce the risk of leakage and reduce the risk of environmental pollution and exposure to people. In toxic media (such as chlorine and ammonia), the sealing of the diaphragm valve can effectively prevent toxic gas leakage and ensure safe operation. 

 Application scenarios 

 Chemical industry: acid and alkali transportation, electroplating fluid circulation, reactor control. 

 Pharmaceutical/food: sterile filling, CIP system, food additive transportation. 

 Environmentally friendly water treatment: sewage discharge, sludge dehydration, reverse osmosis system. 

 Semiconductor/electronics: ultra-pure water preparation, high-purity chemical transportation. 

 Energy/electricity: boiler water supply, cooling water cycle, desulfurization system. 

 Precautions 

 Material restrictions: There is an upper limit on the temperature and pressure resistance of the diaphragm and lining materials (usually ≤1.6MPa, ≤150°C), and the appropriate model needs to be selected according to the working conditions. 

 Maintenance requirements: The diaphragm is a fragile part and needs to be checked and replaced regularly (cycle depends on the corrosiveness of the medium); avoid over-tightening during installation to prevent diaphragm deformation. 

 Operating specifications: It is forbidden to force the use of auxiliary levers to open and close to avoid damage to the valve stem or sealing surface; when deactivating, it is necessary to clean the contact surface of the medium to extend the service life. 

 With its sealing, corrosion resistance, maintenance convenience and extensive adaptability, the diaphragm valve has become an ideal choice in corrosive, high sanitary requirements and complex media scenarios, and plays an irreplaceable role in fluid control and safety guarantee in industrial processes.