Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of safety valve o-rings in China, also supports customized service. Please feel free to buy high quality safety valve o-rings for sale here from our factory.
Description of Safety Valve O-Rings
Safety Valve O-rings are a type of sealing element for safety valves, they are round rubber seals designed to provide a seal between the two parts of the safety valve, ensuring that no fluid can be trapped during the pressure release process leakage. These O-rings are usually installed between the valve body and valve cover of the safety valve, or on the contact surface of the valve disc and other moving parts, to prevent media from leaking during valve operation.
Working principle of safety valve
Set pressure: Set a specific pressure threshold on the safety valve. This threshold is usually achieved by adjusting the preload of the spring. The size of the preload determines the pressure threshold at which the valve core closes.
Normal working condition: In normal working conditions, the valve core of the safety valve is pushed to the closed position by the spring. The valve core and valve seat are tightly sealed to prevent the medium from passing through.
Pressure exceeds the set value: When the system's internal pressure exceeds the set value, pressure acts on the valve core. When the pressure exceeds the spring preload, the valve core begins to move upward.
Valve core opens: As the valve core moves upward, the valve core leaves the valve seat, forming a channel through which the medium can flow out. In this way, excess pressure is released to keep system pressure within a safe range.
Pressure drop: Once the pressure drops below the set value, the force of the spring regains dominance, pushing the valve core back to the closed position. The valve core is tightly sealed with the valve seat again, stopping the flow of the medium.
Characteristics and Functions
- Wear resistance and durability: Safety valves often face high-frequency opening and closing operations, so the safety valve O-ring seal needs to have high wear resistance and durability to ensure long-term reliable use.
- Elasticity and resilience: Safety Valve O-rings have good elasticity and resilience and can adapt to different pressure and temperature changes. It can maintain good sealing performance after the valve core is closed and quickly return to its original state after the pressure is released.
- Preventing medium leakage and overload protection: The main function of the safety valve O-ring is to ensure that the safety valve seals reliably under normal working conditions and prevents medium leakage. When the pressure exceeds the set value, the O-ring of the safety valve opens to release excess pressure and act as overload protection.
- Prevent the intrusion of external media: The O-ring seal can also effectively prevent external media (such as dust, moisture, etc.) from entering the interior of the safety valve and keep the environment inside the valve clean and stable.
- Reduce friction and wear: During the opening and closing process of the safety valve, the O-ring can reduce friction and wear between the valve body and the valve cover, extending the service life of the sealing element.
- Improve safety: Under normal working conditions, when the safety valve reaches the set pressure threshold, the O-ring seal will ensure that the safety valve can open or close accurately to protect equipment and systems from damage by excessive pressure.
Typical application areas
1. Pressure vessels: Safety valve O-ring seals are commonly used in various pressure vessels, such as storage tanks, pipeline systems, compressed air systems, etc. in the oil and gas industry. They ensure the tightness of pressure vessels to prevent leaks and excessive pressure.
2. Petroleum and chemical industry: In the petroleum and chemical industry, safety valve O-rings are used in valves, pumps, pipe connections, and other equipment. They can provide reliable sealing performance, adapt to different media and working conditions, and ensure the safe operation of the system.
3. Energy and power: In the energy and power industry, the safety valve O-ring is used in boilers, steam generators, turbines, gas turbines, and other equipment. They withstand high temperatures and high-pressure environments, ensuring the safety and reliability of the equipment.
4. Pharmaceutical and food: In the pharmaceutical and food industry, safety valve O-ring seals are often used in equipment that handles liquids, gases, or powders, such as reactors, filters, filling machines, etc. They have good sealing properties and corrosion resistance and meet hygiene and food safety standards.
Important factors in selecting safety valve O-ring
When selecting safety valve O-ring seal materials, the following factors are the most important:
■ Working conditions: It is critical to consider the impact of working conditions on seals. Key parameters include temperature range, pressure requirements, corrosive properties of the media, and the possible presence of vibration, shock, or other environmental factors. Make sure the material you choose will maintain consistent performance and sealing under these conditions.
■ Sealing performance: The main goal of the sealing ring is to provide reliable sealing and prevent media leakage. Therefore, it is crucial to choose materials with good sealing properties. Taking into account factors such as the chemical properties, viscosity, and permeability of the medium, the sealing performance of the selected material must match the actual needs.
■ Corrosion resistance: The sealing ring may come into contact with various media, including acids, alkalis, solvents, etc. Therefore, it is very important to choose materials with good corrosion resistance to ensure that the sealing ring can operate stably for a long time in a corrosive environment and is not corroded and damaged by the medium.
■ Life and reliability: Seals need to have sufficient life and reliability to meet the application requirements. Materials should be durable and able to withstand frequent pressure cycles and temperature changes while maintaining their elastic and sealing properties, reducing the need for maintenance and replacement.
■ Regulatory and Standard Requirements: In certain industries and applications, there may be specific regulatory and standard requirements for safety valve and sealing ring materials. When selecting materials, ensure compliance with applicable regulations and standards to ensure safety and compliance.
■ Ask the Experts: Consult with a materials engineer or specialist supplier for their advice and input. They can provide more specific and professional suggestions based on your specific needs and application scenarios.
Existing O-ring standard size table
| Size | CS (IN) | ID (IN) | OD (IN) | CS (MM) | ID (MM) | OD (MM) |
|---|---|---|---|---|---|---|
| 001 | 0.040 | 0.029 | 0.109 | 1.02 | 0.74 | 2.78 |
| 002 | 0.050 | 0.042 | 0.142 | 1.27 | 1.07 | 3.61 |
| 003 | 0.060 | 0.056 | 0.176 | 1.52 | 1.42 | 4.46 |
| 004 | 0.070 | 0.101 | 0.241 | 1.78 | 2.57 | 6.13 |
| 005 | 0.070 | 0.145 | 0.285 | 1.78 | 3.68 | 7.24 |
| 006 | 0.070 | 0.208 | 0.348 | 1.78 | 5.28 | 8.84 |
| 007 | 0.103 | 0.081 | 0.287 | 2.62 | 2.06 | 7.30 |
| 008 | 0.103 | 0.206 | 0.412 | 2.62 | 5.23 | 10.47 |
| 009 | 0.103 | 2.425 | 2.631 | 2.62 | 61.60 | 66.84 |
| 010 | 0.139 | 0.296 | 0.574 | 3.53 | 7.52 | 14.58 |
| 011 | 0.139 | 0.421 | 0.699 | 3.53 | 10.69 | 17.75 |
| 012 | 0.139 | 0.609 | 0.887 | 3.53 | 15.47 | 22.53 |
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