Metal Hard Seal Butterfly Valve

This Dafugui Metal hard seal butterfly valve is a newly manufactured high-quality butterfly valve with an eccentric metal seal structure and a metal-to-metal seal. The metal sealing ring is replaceable for metal-to-metal sealing. The applicable temperature of the Dafugui Metal hard seal butterfly valve depends on the valve body material. It is suitable for use in industrial, metallurgical, and environmental protection pipelines for ventilation and regulating the flow of media.

Product Parameters

Maintenance Methods

1. During use, the metal hard seal butterfly valve should be kept clean. The drive threads must be lubricated regularly. If a malfunction is detected, stop use immediately, identify the cause, and eliminate the problem.

2. The packing gland bolts should be tightened evenly, not crookedly, to avoid damaging or obstructing valve stem movement or causing leakage.

3. During installation, the metal hard seal butterfly valve can be directly installed on the pipeline according to the connection method. Generally, it can be installed at any position on the pipeline, but it should be easily accessible for operation and maintenance. Note that the medium flow direction of the gate valve should be from bottom to top of the valve disc; lift check valves can only be installed horizontally.

4. When using the metal hard seal butterfly valve, only fully open or fully closed is permitted. It is not allowed to be used for flow regulation to avoid erosion of the sealing surface and accelerated wear. Gate valves and top-threaded globe valves have a reverse sealing device; tightening the handwheel to the uppermost position will prevent medium leakage from the packing.

5. When opening and closing the metal hard seal butterfly valve, use the handwheel. Do not use levers or other tools to avoid damaging the valve components. 6. Turning the handwheel clockwise closes the valve and counterclockwise opens it.

7. Before installation, carefully check the pressure and diameter markings on the valve to ensure they meet the usage requirements. Eliminate any defects caused during transportation and remove any dirt from the valve components.

8. Metal hard seal butterfly valves stored for extended periods should be inspected periodically. Exposed machined surfaces must be kept clean and free of dirt. When storing ball valves, both ends should be plugged and the valve should be in the open position. For pneumatic butterfly valves, both ends of the passage should be plugged and the passage closed. Store neatly in a well-ventilated, dry indoor location. Stacking or outdoor storage is strictly prohibited.

Product Features

The metal hard seal butterfly valve features a one-piece valve body and seat. The sealing surface of the seat is overlaid with a high-temperature and corrosion-resistant alloy material. Multiple soft-stacked sealing rings are fixed to the valve plate. Compared to traditional butterfly valves, this type of butterfly valve offers high temperature resistance, easy operation, frictionless opening and closing, and improved sealing performance and extended service life due to the increased torque of the transmission mechanism during closure, all achieved through increased torque.

Acceptance Notes

It is essential for users to conduct sampling or full inspection of the valves purchased. Sampling inspections serve two purposes: first, to control product quality; and second, to reduce unnecessary maintenance and replacements after installation, resulting in a higher first-time installation success rate.

When testing a metal hard seal butterfly valve, lay it flat with the pressure ring side facing upwards. Place a pressure plate on this flat surface that is approximately the same size as the flange outer diameter and valve diameter.

1. If using a pressure testing machine, the pressure claws should press against this pressure plate to ensure even pressure distribution on the pressure ring on one side of the valve body.

2. If testing with a blind flange, metal hard seal butterfly valves are generally tested using two flanges clamped together. Sometimes, for convenience, users only use one flange at the bottom to bolt to the valve. In this case, the fixing screws on the pressure ring above the valve body must bear the entire pressure of the medium. Since these screws cannot withstand the entire pressure, the valve will not leak when tested with a blind flange, and the test result will be essentially the same as the actual operating condition.