turbine trunnion metal seal ball valve
maintenance
1. Remove the ball valve manually:
2. Prepare all tools used during maintenance: Save time by having every tool you need ready in advance
3. Release the inlet and outlet pressure of the valve:
4. Spare parts to protect valves through sealing:
5. During disassembly, gradually unscrew the bolts in an even and symmetrical manner:
6. Apply appropriate cleaner to different parts of the valve:
8. After cleaning, remove the parts from the cleaner:
9. Apply lubricant to the valve and its spare parts when putting them back together:
structure
The body of the O-type ball valve is equipped with a ball with a middle through hole. The ball has a through hole with a diameter equal to the diameter of the pipe. The ball can rotate in the sealing seat. There is an annular elastic ring on both sides in the direction of the pipe. body to achieve sealing. By rotating the ball 90°, the direction of the through hole can be changed, thereby realizing the opening and closing of the ball valve.
The valve core (ball) of the O-type ball valve is spherical. From a structural point of view, the ball seat is embedded in the seat on the side of the valve body when sealing. The relative moving parts are made of self-lubricating materials with extremely small friction coefficient, so the operating torque is small. In addition, the long-term sealing of sealing grease makes the operation more flexible. Generally used for two-position adjustment, the flow characteristics are quick opening.
application
Ball valves can generally be divided into three categories according to their structural forms: floating ball valves, trunnion ball valves, and elastic ball valves. According to different sealing properties, they are divided into metal-seal ball valves and soft-seal ball valves. The soft-seal ball valve has better sealing performance and can achieve zero leakage. It is generally used in normal temperature and pressure pipelines with corrosive media, while metal-seal ball valves are not only It can be used at normal temperatures and pressures, as well as in low-temperature, low-pressure and high-temperature and high-pressure pipelines.
Installation
Make sure that pipes and valves have been cleaned before operation.
The actuator operation of the valve drives the valve stem to rotate based on the size of the input signal: when it rotates 1/4 turn (900) in the forward direction, the valve is closed. When rotated 1/4 turn (900) in the opposite direction, the valve opens.
When the actuator direction indicator arrow is parallel to the pipeline, the valve is open; when the arrow is perpendicular to the pipeline, the valve is closed.
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