Volume boosters: used to increase the positioning speeds of pneumatic actuators

Volume boosters by SAMSON
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Volume boosters are used together with positioners to increase the positioning speeds of pneumatic actuators. They influence the process to vent or fill the actuator with air, which causes the control valve to open or close more quickly.

The Type 3755 Pneumatic Volume Booster features a linear characteristic and an ideal boost ratio. The low-temperature version can be used at ambient temperatures down to –55 °C.

Type 3755-2 is fitted with an additional flange with a threaded exhaust port to discharge the exhaust air through a pipe or to feed it back for purging of the actuator spring chamber. This version is available either in stainless steel or aluminum.


Standard use

Normally, the volume booster is mounted between the positioner and actuator. To filter the supply air and keep the supply pressure constant, the air is fed to the booster through a supply pressure regulator. This way, the volume booster supplies the actuator with an air flow output whose pressure corresponds exactly to the signal pressure of the positioner, except that it has a much higher volume.


1 Positioner – 2 Supply pressure regulator – 4 Control valve (fail-close) – 6 Pneumatic volume booster

In combination with a solenoid valve

A solenoid valve can be mounted between the volume booster and actuator. In this case, the solenoid valve must be large enough to use the full air capacity of the volume booster.

1 Positioner – 2 Supply pressure regulator – 3 Solenoid valve – 5 Control valve (fail-open) – 6 Pneumatic volume booster

Together with valve accessories, pneumatic control valves serve as engineered solutions for special applications. SAMSON has been developing and manufacturing high-quality valves, actuators and valve accessories for over 100 years. Thanks to our experience and expertise as well as customer requirements, we have continuously developed the individual components and optimized their interaction.

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