Chemical reactors rubber seals of diaphragm valve
In chemical reactors, the rubber seals of diaphragm valves mainly include the following parts
These rubber seals play a key sealing role in chemical reactor diaphragm valves to ensure the safe and reliable operation of the reactor. The selection of appropriate rubber materials and seal types depends on factors such as the reactor's working conditions, media characteristics, temperature, and pressure. Depending on the specific reactor design and application requirements, seals of different materials can be selected to meet the sealing performance and corrosion resistance requirements of chemical reactors.
Technical data
EPDM
|
Properties |
unit |
test |
Value |
|
color |
|
|
black |
|
specific weight |
g/cm3 |
|
1.48 |
|
indentation hardness |
Shore A |
ASTM D2240 |
63 |
|
breaking load |
MPa |
ASTM D412 |
4,0 |
| elongation at break | % | ASTM D412 | 200 |
|
tearing |
N/mm |
ASTM D624 Die C |
10 |
|
abrasion resistance |
mm3 |
DIN ISO 4649 (10N) |
478 |
| work temperature | ℃ | -25/70 | |
|
thermal aging (70h to 70℃) |
ASTM D573 |
+10 -20 -40 |
|
|
permanent deforestation (22h to 70 ℃) |
ASTM D395 Método B |
Def. Max.: 43 | |
|
solvent resistance (70h to 100℃) |
ASTM D471 |
+5% +12% |
Diaphragm: The diaphragm is the core sealing element of the diaphragm valve and is usually made of rubber material. Commonly used rubber materials include nitrile rubber (NBR), chloroprene rubber (CR), fluorine rubber (FKM), etc. As the moving part of the valve, the diaphragm opens and closes the valve through pressure changes. The diaphragm has good elasticity and corrosion resistance, and can withstand harsh working conditions such as high temperature and high pressure.
O-ring (O-Ring): an O-ring is an annular rubber seal that is often used in the connection part of diaphragm valves, such as between the valve cover and the valve body. O-rings are typically made of nitrile rubber (NBR), fluorine rubber (FKM) and other materials, and have good sealing performance and chemical corrosion resistance. It provides a reliable seal to prevent leakage and media penetration.
Seat Seal: The seat seal is located on the seat part of the diaphragm valve and is usually an embedded rubber seal. Commonly used materials include nitrile rubber (NBR), fluorine rubber (FKM), polytetrafluoroethylene (PTFE), etc.
Products Testing Description
For chemical reactor diaphragm valve rubber seals, common test standards and methods include the following aspects
- Sealing performance test: used to evaluate the sealing performance of rubber seals, including leakage testing and pressure testing. Common testing standards include ISO 5208 (metal valve sealing performance testing), API 598 (valve inspection and testing), etc. The test method can use air tightness test or liquid tightness test, by applying pressure or medium, and observing whether there is leakage to evaluate the qualification of sealing performance.
- Corrosion resistance test: used to evaluate the resistance and stability of rubber seals under different corrosive media. Common test standards include ASTM D471 (corrosion resistance test of rubber materials in liquids and gases), ISO 1817 (corrosion resistance test of rubber and plastic products), etc. The test method can use the immersion method or the exposure method to expose the seal to a specific corrosive medium and evaluate its performance changes after a certain period of time.
- Temperature tolerance test: used to evaluate the performance stability and deformation of rubber seals under different temperature conditions. Common test standards include ASTM D573 (Test of deformation and failure temperature of rubber materials under heating conditions), ISO 815 (Determination of thermal deformation temperature of rubber and plastics), etc. The test method can use hot air or hot water bath to observe the deformation and performance changes of the seal in a high temperature environment.
- Material physical property testing: Test the physical and chemical properties of rubber materials, including hardness testing, tensile strength testing, tear strength testing, abrasion resistance testing, chemical stability testing, etc. Common testing standards include ASTM D2240 (rubber material hardness test), ASTM D412 (rubber material tensile strength and elongation test), etc.
These testing standards and methods can be carried out by selecting appropriate test items based on specific application requirements and material characteristics. Evaluating the performance of rubber seals through testing can ensure that they meet the requirements of chemical reactors and provide reliable sealing and durability.
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