The VD 30 fine control valve is a universally applicable valve specifically for the pressure range up to 64 bar. However, due to the strength of the valve body, it can be used for pressures up to 400 bar. The thread of the valve stem is located in the upper part of the valve yoke so that corrosion cannot occur if medium escapes from the stuffing box. The nominal seat width is 3 mm, so that it can serve as a fine control valve, shut-off valve and for pressure reduction.
Dr. Thiedig has developed special components for the secondary circuit of nuclear power plants. This application requires high demands in terms of function, safety and tightness. Among other things, special sampling coolers, cation filters (pressure-resistant), bellows valves and pressure reducers have been developed for this purpose. All components can be manufactured in requirement level AS 3, some in AS 2.
Advantages:
- special components for the primary circuit
- high safety standards
- Production in requirement level AS 3 (in some cases even AS 2)
In accordance with VGB guidelines, the pressure of the sample water is reduced after cooling. This prevents, for example, the precipitation of salts and thus ensures representative sampling. Special accessories are available for high requirements in terms of function and safety. In addition, reducing the pressure only when the temperature is lowered massively increases the service life of the valves.
Advantages:
- Pressure reduction up to 400 bar
- Simple and robust design as a needle valve
- Replaceable valve seat for abrasive media
- Differential thread for easy operation
- Adjustment of smallest sample flows due to special corner design of the needle valve