Structural Features Of High-pressure Floating Ball Valves

1. The opening and closing of the manual floating ball valve indicate that the ball, valve stem, and handle are the moving parts of the valve and are an assembly unit. The head of the valve stem adopts a flat square structure, and it is easy to tell from the position of the handle that the valve is in the open position. or off position. When the flat side of the handle or stem is parallel to the axis of the pipeline, the valve is in the open position, and when the flat side of the handle or stem is perpendicular to the axis of the pipeline, the valve is in the closed position.

2. Valve lock position. In order to prevent misoperation of the valve, the valve can be locked at the fully open and fully closed positions, especially for valves installed in the field or when the process flow does not allow the valve to be opened or closed, in order to prevent other personnel from misoperating the valve, set the valve position Locking is important. Therefore, according to the user's needs, installing a positioning piece with a keyhole in the valve design can meet the user's process requirements.

3. Anti-flying-out structure of valve stem. When the medium passes through the valve, the pressure in the middle cavity of the valve body may push the valve stem out (or when the valve is being repaired, if there is pressure in the middle cavity, when the valve stem is disassembled, the medium is likely to fly out and accidentally injure people). In order to prevent this from happening, a protruding structure is provided at the lower part of the valve stem. In this way, in the event of an immediate fire, the packing and thrust bearing are burned out or the packing is damaged due to other reasons, the medium pressure in the valve body will use the valve stem boss to closely contact the sealing surface on the valve body to prevent a large amount of medium from being released from the damaged packing. Leakage at the site.

4. Anti-static device. When the valve is operated, due to the friction between the ball and non-metallic materials such as PTFE and the valve seat, an electrostatic charge is generated and accumulated on the ball. In order to prevent static sparks, an anti-static device is specially installed on the valve, and the charge accumulated on the ball is exported through the static channel between the ball and the valve stem, and between the valve stem and the valve body.

5. Fireproof structure. In case of fire, fill. Non-metal (non-fireproof materials) such as valve seats will be burnt out, and a large amount of leaked medium may further promote the spread and expansion of the fire. At this time, the fireproof structure of the valve can prevent a large amount of leakage of the medium.