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20inch 900LB Reduce Bore LF3 Trunnion Mounted Ball Valve | China Suppliers and Factory for Oil & Gas Applications
Products Specification
| Type | Trunnion Mounted Ball Valve |
| Size | 20”*18“ |
| Pressure | 900LB |
| Connection | Flange End |
| Operation | Gear Box |
| Body Material | LF3 |
| Design Standard | API6D |
| FTF Dimension Standard | ASME B16.10 |
| Flange Dimension Standard | ASME B16.5 |
| Test Standard | API598 |
| Application | W.O.G |
Features
1. Trunnion Design
The ball is fixed in place by a trunnion (a shaft or pin) at the top and bottom, which reduces the load on the valve seats and ensures stable operation.
2. Low Operating Torque
The trunnion design reduces the friction between the ball and the seats, requiring less force to operate the valve. This is especially beneficial in high-pressure applications.
3. Double Block and Bleed (DBB) Capability
Trunnion mounted ball valves can isolate both upstream and downstream sides of the valve simultaneously, allowing for the bleeding of pressure or fluid from the cavity between the seats.
4. Sealing Performance
The design provides better sealing performance, as the seats are spring-loaded or activated by the line pressure to maintain a tight seal.
5. Safety and Reliability
These valves are known for their high reliability and are often used in critical applications like oil and gas, petrochemical, and power industries.
6. Size and Pressure Handling
Suitable for larger diameters and high-pressure conditions, trunnion mounted ball valves can handle a wide range of pressures and temperatures.
7. Bi-Directional Operation
These valves can control the flow of fluid in both directions, providing flexibility in various piping configurations.
8. Extended Service Life
The reduced wear and tear on the seats due to the trunnion support leads to a longer service life and lower maintenance costs.
9. Emergency Sealant Injection System
Many trunnion mounted ball valves have an emergency sealant injection system that allows for sealing in case of seat damage.
10. Fire-Safe Design
Many trunnion mounted ball valves are designed to be fire-safe, ensuring operation even under fire conditions to prevent leakage and maintain control.
These features make trunnion mounted ball valves a preferred choice for demanding applications where durability, reliability, and performance are critical.
Application
Trunnion mounted ball valves are used in a wide range of applications, especially where high pressure, large diameter, and reliable sealing are required. Here are some of the primary applications:
1. Oil and Gas Industry
- Upstream: Used in drilling operations, production manifolds, and wellhead equipment.
- Midstream: Ideal for pipeline systems, storage facilities, and compressor stations.
- Downstream: Commonly found in refineries and petrochemical plants for controlling process flows.
2. Petrochemical Industry
Utilized in the transportation and processing of chemicals, where robust and reliable sealing is critical.
3. Power Generation
Used in power plants, including nuclear, thermal, and hydroelectric, to control steam, water, and other fluids in high-pressure systems.
4. Water and Wastewater Treatment
Employed in large-scale water treatment plants and distribution systems for their durability and ability to handle high pressures.
5. Marine and Offshore Applications
Suitable for subsea applications and offshore platforms where reliability under extreme conditions is essential.
6. LNG and Cryogenics
Used in liquefied natural gas (LNG) plants and cryogenic processes due to their ability to perform well at low temperatures.
7. Mining and Minerals Processing
Applied in slurry handling, ore processing, and other high-abrasion environments.
8. Pulp and Paper Industry
Used in the processing and transport of pulp and paper products, where large volumes and high pressures are common.
9. HVAC Systems
Utilized in heating, ventilation, and air conditioning systems for large buildings and industrial complexes.
10. Industrial Manufacturing
Used in various manufacturing processes where reliable fluid control is necessary.
11. Chemical Processing
Employed in the handling of corrosive and hazardous chemicals where high integrity and reliability are needed.
12. Fire Safety Systems
Often integrated into fire suppression systems, especially in industrial settings, due to their fire-safe design.
These applications highlight the versatility and reliability of trunnion mounted ball valves in various high-pressure and critical service environments.
Technical Drawing
Frequently Asked Questions
Q1: What is the main difference between a floating ball valve and a trunnion ball valve?
In a floating ball valve, the ball is suspended in the flowing fluid and is pushed against the downstream seat under pressure to create a seal. In a trunnion mounted ball valve, the ball is anchored by a shaft (trunnion) at the top and bottom, keeping it fixed in position while the seats are pressed against the ball by spring or line pressure.
Q2: What does Double Block and Bleed (DBB) mean?
Double Block and Bleed means the valve has two seating surfaces which, when in the closed position, block flow from both valve ends. This allows the cavity between the seats to be vented or bled to check the integrity of the seals or drain fluid without disrupting the main pipeline pressure.
Q3: Why is LF3 material used for the valve body?
LF3 (ASTM A350 LF3) is a low-temperature carbon steel commonly used for piping components. It offers excellent toughness and impact resistance at sub-zero temperatures, making it highly suitable for cold climates, cryogenic applications, and low-temperature gas services.
Q4: What is the purpose of an emergency sealant injection system?
The emergency sealant injection system allows operators to inject specialized sealant directly into the seat area or stem packing area. This provides a temporary seal if the primary soft seals are damaged by debris or extreme conditions, preventing hazardous leakage until maintenance can be performed.
Q5: Are these trunnion ball valves fire-safe?
Yes, many trunnion mounted ball valves are designed and certified to fire-safe standards (such as API 607 or API 6FA). They feature secondary metal-to-metal seating that prevents major leakage even if the primary soft seals are completely destroyed during a fire.