The pressure inside a pipe is rarely constant particularly in industrial applications – static pressure increases or short-term pressure surges frequently tamper with the plant. Pressure instruments may be affected by these fluctuations. The consequences range from erroneous measurement results to irreparable damage if the maximum allowable pressure of the gauge is exceeded. This can be remedied with gauge protectors and gauge snubbers by AS-Schneider.
These gauge protectors and snubbers are designed to provide a reliable and economical solution to protect measuring instruments from the effects of pressure fluctuations.
Gauge protectors are designed for steadily increasing and continuous pressure such as in the thermal expansion of the medium in the pipeline. A shut-off valve is located in the interior which works against a spring. If the pressure in the line is less than the spring force, the valve opens.
If the pressure force exceeds the spring force, a piston moves toward the valve seat and closes off access to the pressure gauge. Measuring Instruments are thus protected from damage. If the pressure drops below the set limit, the valve opens again.
The standard version of the AS-Schneider gauge protectors sits in a forged stainless steel or brass body. Other materials are, however, available for special requirements. The maximum set pressure is 600 bar; the maximum inlet pressure is also 600 bar for brass. Stainless steel is even higher at 1000 bar. Gauge protectors are suitable for use up to 80 degrees Celsius.
AS-Schneider gauge snubbers are designed to reduce the pressure spikes that can occur from the rapid closing of a valve. Pressure surges that occur at the gauge snubber inlet are reduced via an adjustable gap between the valve stem and the body seat. Measuring instruments can be read more accurately in this way because pressure fluctuations are smoothed out. Gauge snubbers can also be used as a timing element in a controller. Its body is usually made of brass but other versions in different materials using bar material are also available.
