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What are PTFE Gate Valve Seat Seals
A gate valve seat seal is a sealing component used for gate valves. PTFE gate valve seat seals are often used in fluid control systems in chemical, petroleum, pharmaceutical, food processing, and other industries to ensure normal operation and reliable sealing performance of the valve.
special features
- Elastomeric materials: Gate valve seat seals are usually made of elastomeric materials, such as rubber or elastomeric polymers. This material can form a tight seal between the gate plate and the valve body and has certain compressibility and recovery properties to adapt to sealing requirements under different working conditions.
- Fire resistance: Some special gate valve seat sealing materials may have good fire resistance and can maintain sealing performance in case of fire and prevent flame and smoke from leaking through the valve.
- Pressure seal: The PTFE gate valve seat seals can withstand high pressure, ensuring that the valve can effectively prevent medium leakage when it is closed. Therefore, gate valve seat seals are usually made of materials that provide a good pressure seal, such as metal or elastomeric materials.
- Anti-leakage performance: The PTFE gate valve seat seal can effectively prevent the medium from leaking from the valve seat seal. To ensure good anti-leakage performance, the gate valve seat seal usually adopts a sealing sub-structure design, such as a pressure balance structure or a multi-layer sealing structure.
- Fast switching performance: The gate valve seat seal can quickly switch media flow to meet the requirements for fluid flow.
Structural characteristics
PTFE (polytetrafluoroethylene) gate valve seat seal has the following structural characteristics:
■ Single sealing structure: PTFE gate valve seat seal usually adopts a single-sealing structure, that is, a sealing ring made of one material. This structure is simple, compact, and easy to install and maintain.
■ Embedded design: The PTFE gate valve seat seal often adopts an embedded design, that is, the PTFE sealing ring is embedded into the seat groove in the valve body. This design ensures the sealing ring is fixed and stable, preventing it from shifting or loosening during use.
■ Bidirectional sealing performance: PTFE gate valve seat seal has bidirectional sealing performance, that is, it can effectively seal the medium when the valve is open or closed. This means that regardless of the flow direction of the medium, the PTFE gate valve seat seal can provide reliable sealing performance.
■ High-precision processing: Due to the particularity of PTFE material, PTFE gate valve seat seals usually require high-precision processing. This includes precise control of the size, shape, and surface smoothness of the sealing rings to ensure good sealing and operating performance.
Applicable working conditions
PTFE (polytetrafluoroethylene) gate valve seat seal has wide applicability in many working conditions, especially in the following working conditions:
1. Corrosive media: The PTFE gate valve seat seals have excellent corrosion resistance and can resist the erosion of a variety of chemical media, including strong acids, alkalis, solvents, etc. Therefore, it is ideal for handling and controlling corrosive media, such as chemical, petroleum, pharmaceutical, and other industries.
2. High-temperature medium: The gate valve seat seal can maintain stable performance in high-temperature environments. It can usually be used in the temperature range of -200°C to +260°C, so it is suitable for applications that need to work under high-temperature conditions, such as thermal media systems, petroleum refining, etc.
3. Low-temperature medium: The gate valve seat seal can also provide reliable sealing performance in low-temperature environments. It remains soft and elastic at low temperatures and can effectively prevent media leakage. Therefore, it is suitable for cryogenic applications such as liquefied natural gas (LNG).
4. Cleaning medium: Because PTFE is non-adhesive, it has good adaptability to cleaning media. It prevents media from accumulating and clogging the seat seal, ensuring smooth operation and effective sealing of the gate valve. Therefore, it is commonly used in cleaning processes and the food industry.
5. High-pressure application: PTFE gate valve seat seals have good pressure resistance and can withstand high working pressure. It can provide reliable sealing in high-pressure environments and is suitable for systems requiring high-pressure control and processing, such as petroleum pipelines, chemical pipelines, etc.
Physical property information
| Physical Properties | Rating (Metric) | Rating (Imperial) | Test Method |
| Specific gravity | 2.18 g/cc | 2.18 g/cc | DIN 53 479 |
| Saturated water absorption | <= 0.050 % | <= 0.050 % | DIN 53 495 |
| Mechanical Properties | Ratings (metric) | Ratings (imperial) | Test Methods |
| Ball pressure hardness | 30.0 MPa @Time 30.0 sec |
4350 psi @Time 0.00833 hour |
DIN 53 456 |
| Tensile strength | 25.0 MPa | 3630 psi | DIN 53 455 |
| Elongation (breaking) | 500 % | 500 % | DIN 53 455 |
| Tensile modulus | 0.700 GPa | 102 ksi | DIN 53 457 |
| Electrical Properties | Ratings (Metric) | Ratings (Imperial) | Test Methods |
| Dielectric constant | 2.1 @Frequency 1.00e+6 Hz |
2.1 @Frequency 1.00e+6 Hz |
DIN 53 483, IEC-250 |
| Dielectric loss index | 0.00020 @Frequency 1.00e+6 Hz |
0.00020 @Frequency 1.00e+6 Hz |
DIN 53 483, IEC-250 |
| Thermal Performance | Rating (Metric) | Rating (Imperial) | Test Method |
| Coefficient of linear thermal expansion | 200 µm/m-°C | 111 µin/in-°F | |
| Thermal Conductivity | 0.250 W/m-K | 1.74 BTU-in/hr-ft²-°F | |
| Maximum operating temperature, Air | 260 °C | 500 °F | Continuous use |
| Heat distortion temperature under load (0.46 MPa) | 121 °C | 250 °F | ISO-R 75 Method B |
| Glass transition temperature, Tg | -20.0 °C | -4.00 °F | dynamic; DIN 53 736 |
Specification size table
| Valve Nominal Diameter | Pressure Level | ||
| Inch | MM | PSI | Mpa |
| 1-13/16" | 46 | 10K/15K | 70/105 |
| 2-1/16" | 52 | 2K/3K/5K/10K/15K | 14/21/35/70/105 |
| 2-9/16" | 65 | 3K/5K/10K/15K | 21/35/70/105 |
| 3-1/16" | 78 | 10K/15K | 70/105 |
| 3-1/8" | 80 | 2K/3K/5K | 14/21/35 |
| 4-1/16" | 103 | 3K/5K/10K/15K | 21/35/70/105 |
| 5-1/8" | 130 | 5K | 35 |
| 6-3/8" | 162 | 3K/5K | 21/35 |
| 7-1/16" | 180 | 3K/5K | 21/35 |
| 7-1/16" | 180 | 3K/5K/10K | 35/70/105 |
Working Conditions
| Temperature range | Pressure | Medium | Material |
| -50℃~+260℃ | 0~15000 PSI | Hydraulic fluids, crude oil, sour oil/gas, H2S, salty water | Filled PTFE/PEEK |
*Special reminder, if you need this seal product, please provide us with the corresponding drawings so that we can provide you with better help.
If you would like more information about this product, please contact us.
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