The trunnion high-pressure ball valve is a valve specifically designed for high-pressure conditions. Its core structure uses upper and lower valve stems to fix the ball, preventing the high-pressure medium from pushing the ball out of place, thus ensuring sealing stability. This valve uses a metal or soft-seal structure and is suitable for high-pressure environments of Class 1500~2500 (PN160~PN420) and above. It is widely used in oil, natural gas, chemical, and power industries, and is a key device in high-pressure pipeline systems for cutting off, distributing, or changing the flow direction of media.
Structural Features
High-pressure fixed ball valves typically consist of a valve body, ball, seat, stem, and sealing ring. Specifically:
Ball: Made of high-strength materials (such as stainless steel) to ensure it does not deform or break under high pressure. The ball is fixed within the valve body and will not move due to medium pressure.
Seat: Employs a floating design; it moves under medium pressure, pressing the sealing ring tightly against the ball to ensure a tight seal.
Working Principle
The high-pressure fixed ball valve operates by rotating the stem, causing the ball to rotate 90 degrees around the valve body's centerline to open and close the valve. When the ball rotates to a position perpendicular to the pipeline axis, the valve closes, cutting off fluid flow; when the ball rotates to a position parallel to the pipeline axis, the valve opens, allowing fluid to flow smoothly.
Performance Advantages
High-Pressure Sealing: Due to the fixed ball and the use of high-strength materials, high-pressure fixed ball valves can withstand high medium pressure while maintaining stable sealing performance.
Low fluid resistance: The diameter of the ball valve channel is similar to that of the pipe, resulting in low resistance when the medium passes through, which helps reduce energy loss.
Easy operation: The valve can be opened and closed with just a 90-degree rotation, making operation simple and quick.
Long service life: The simple structure and ease of maintenance, along with the generally movable sealing rings, facilitate easy disassembly and replacement, thus extending the valve's service life.
Application Scope
High-pressure fixed ball valves are widely used in high-pressure pipeline systems in industries such as petroleum, chemical, natural gas, and power. In these industries, the fluid media often exhibit characteristics such as high pressure, high temperature, and corrosiveness, making high-pressure fixed ball valves an ideal choice due to their excellent performance and reliability.
Maintenance and Care
To ensure the normal operation of high-pressure fixed ball valves and extend their service life, regular maintenance and care should be performed. Specific tasks include:
Checking sealing performance: Regularly check the sealing performance of the valve seat to ensure there is no leakage.
Cleaning the valve cavity: Regularly clean the inside of the valve cavity to prevent the accumulation of impurities that could affect sealing performance.
Lubricating the valve stem: Regularly lubricate the valve stem to reduce friction and wear.
Replace damaged parts: Replace aging or damaged parts in a timely manner, such as seals and valve stems.