To choose the right Explosion-Proof Pneumatic Ball Valve sealing ring material, the following key factors need to be considered comprehensively:
1. Medium properties
Chemical corrosiveness: If the conveyed medium is highly corrosive, such as strong acids such as sulfuric acid and hydrochloric acid, polytetrafluoroethylene (PTFE) is a good choice. It has stable chemical properties and can resist corrosion from a variety of strong acids, strong alkalis, and organic solvents. For some weakly corrosive media, such as ordinary saline solutions, rubber sealing rings, such as ethylene propylene diene monomer (EPDM), can also meet the requirements.
Medium temperature: High-temperature media have high requirements for the heat resistance of sealing ring materials. When the medium temperature is 200-300℃, para-polyphenylene (PPL) sealing rings can be selected, which can maintain good physical properties and sealing performance at high temperatures. For normal-temperature media, nitrile rubber (NBR) sealing rings have low costs and good sealing effects.
Cleanliness of the medium: If the medium contains particulate impurities, such as ore pulp, sandy sewage, etc., it is necessary to select a seal ring material with good wear resistance, such as reinforced polytetrafluoroethylene (RPTFE), which has added wear-resistant reinforcement materials and can effectively resist the erosion and wear of particles.
2. Working pressure
Low-pressure environment: In a low-pressure system with a pressure below 1 MPa, rubber seals, such as nitrile rubber (NBR) and silicone rubber (VMQ), can meet the sealing requirements. They have good elasticity and can achieve effective sealing under low pressure.
Medium- and high-pressure environment: When the working pressure is 1-10 MPa, polytetrafluoroethylene (PTFE) and its modified materials are more suitable choices. They have high hardness and can withstand a certain pressure without excessive deformation. For high-pressure systems with a pressure higher than 10 MPa, metal seals may need to be used, such as seals made of stainless steel, copper, etc., which have higher strength and pressure resistance.
3. Cost factors
On the premise of meeting the use requirements, cost factors should be considered. Rubber seals are relatively cheap and suitable for cost-sensitive and less demanding applications. Some high-performance special materials, such as para-polyphenylene (PPL), are more expensive and are usually used in key locations that require extremely high sealing performance and an operating environment.
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