How to Realize Thermal Insulation of Pneumatic Three-way Ball Valve
Because of the production demand of individual enterprises,
thermal insulation pneumatic three-way ball valves are often selected. How to realize
thermal insulation in the production process?
1. The sealing structure of the valve seat has also been improved accordingly. A groove is cut into the valve body and the supporting ring. The bottom of the groove is filled with flexible graphite with superior sealing performance and high temperature resistance, which can not only play a sealing role at the bottom of the valve seat, but also play a role in compensating for expansion due to heat and contraction due to cold among the sealing pairs. The high temperature resistant metal valve seat installed on the flexible graphite can be used for a long time at the service temperature up to 425℃, thus solving the problem that the thermal insulation
three-way ball valve cannot be used for a long time above 200℃. Moreover, valve seats made of different materials can be selected according to the requirements of actual working conditions.
2. Between the bearing ring and the valve body, O-ring is usually used as radial sealing structure for improvement, instead of O-ring sealing structure, a step structure is directly machined on the bearing ring to form a sealing cavity between the bearing ring and the valve body. A sealing ring made of flexible graphite material with high temperature resistance is installed in the sealing cavity. A gasket with cone section is installed behind the sealing ring, and a screw plug with special structure is installed behind the gasket, so that by screwing the screw plug, the force is transmitted to the gasket. The conical section of the gasket will squeeze the sealing ring, and the sealing ring will be deformed, so that it will be closely attached to the supporting ring and the valve body inside and outside in the radial direction. Therefore, the
thermal insulation three-way ball valve can obtain a high-temperature resistant sealing structure in the radial direction. At the same time, by tightening the screw plug, a pre-tight sealing force will be generated between the ball and the valve seat, so that it can be well sealed.
3. The bottom nozzle which plays a role in draining is connected with the plug by threads. When the temperature rises, it is difficult to ensure the sealing of the threaded part. It is decided to cancel the plug, replace the plug connected with the bottom nozzle with a stepped blowdown plug, and seal the connecting end with a winding pad to ensure the sealing reliability of the bottom.