PQ41 cast iron flange manual drain ball valve

PQ41 Cast Iron Sewage Ball Valve Product Overview:

1. Advanced valve seat: The valve seat is designed based on many years of ball valve manufacturing experience to ensure valve sealing, low friction coefficient, small operating torque, multiple valve seat materials, and a wide range of applications.

2. Error-free handle for switching: The flat-head valve stem is used, and the connection with the handle will not be misaligned, so as to ensure that the switching state indicated by the handle is consistent with the valve.

3. Locking device: In order to prevent misoperation of the valve switch, there are locking holes in the fully open and fully closed positions of the valve to ensure that the valve is in the correct position.

4. Valve stem anti-flying structure: The valve stem is a bottom-mounted type to prevent it from flying out under pressure. At the same time, it can form metal contact with the valve body after a fire to ensure the valve stem is sealed.

PQ41 cast iron ball valve structure principle:

The PQ41 cast iron blowdown ball valve directly relies on the force generated by the medium pressure to help seal the mechanical load acting on the disc. The mechanical load acting on the disc is mainly from the compression spring, which is almost a fixed mechanical load. Although for the compression spring, the loaded blowdown valve can achieve a good seal by adjusting the spring force, but the seal pressure difference must be strong enough to ensure sufficient sealing force to achieve sealing when the valve is operating normally. The sealing pressure difference should also be less than the opening and closing pressure difference to ensure flexible opening.

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