The reaction chamber is where the thermal decomposition reaction and deposition occurs. Because the reaction chamber of an MOCVD system contains the longest time constant for reactant flushing, the abruptness of interfaces is largely controlled. Reaction chamber walls are generally made of either fused silica or stainless steel. It is used for producing semiconductor layers, superconductors, or other layers on any desired substrate, such as silicon or SiC. In many applications, inductive heaters or resistant heaters are used for heating the substrates and/or other elements of the reaction chamber. For feeding the induction coils or other electrical elements disposed in the reaction chamber for heaters, sensors or control devices, it is necessary to provide electrical feethroughs and especially HF or RF (radio frequency) feethroughs.

Reaction torque sensor uses a sensing element that is connected between the drive member and the driven member. Under dynamic conditions the sensing element will be in motion, thereby making the torque measurement more difficult. Not only the overall bandwidth of the system decrease, but the original torque will also be changed because of the inclusion of an auxiliary sensing element. The reaction method of torque sensing eliminates these problems to a large degree. This method is used to measure torque in a rotating machine. The supporting structure of the rotating machine is cradled by releasing its fixtures and the effort necessary to keep the structure from moving is measured. It is widely used in dynamometers that determine the transmitted power in rotating machinery through torque and shaft speed measurements.

Reaction type turbines develop torque by reacting to the fluid's pressure or weight. The pressure of the fluid changes as it passes through the turbine rotor blades. These blades have a more internal efficiency, due to lower mean velocities and a more convergent character of its steam flow. A pressure casement is needed to contain the working fluid as it acts on the turbine stage or the turbine must be fully immersed in the fluid flow (wind turbines). The casing contains and directs the working fluid and, for water turbines, maintains the suction imparted by the draft tube. Most of the steam turbines use this concept.

Reaction Vessels represent fixed volume chambers with artificial light sources to initiate photochemical reactions. The reaction vessels are held at 25 C in thermostatically controlled water. The reaction vessels are produced with a volume from 250 ml up to 20 litres with flat bottom, round bottom or bumped boiler end.

Reactive barrier walls are passive treatment systems that permit groundwater flow through a specific treatment medium. Contaminants in the groundwater react with the installed medium. These contaminants are either degraded, precipitated or absorbed, depending on the type of contaminant and the medium used. It remediates contaminated groundwater and soil without mass excavation, disposal, or conventional pump & treat methods. Usually, a treatment media or reactive barrier is buried in a narrow trench beneath the ground surface so that contaminated groundwater passes through the media, and it emerges clean because contaminates are treated and/or removed by the reactive barrier.

Reactive ion etching systems are used for cleaning, descumming, stripping resist and etching a multitude of materials. It is used in two parallel plates with the top plate grounded and on the bottom plate, the samples or silicon wafers to be etched are placed. It is connected to the RF power source.

Reactive Silencers are designed for reducing the noise of specific frequency band. Reactive silencers are multi-chambered silencers designed to combine the high frequency acoustic packing of a dissipative silencer with the low frequency chamber/tube configuration of a reactive silencer. Reactive silencers consist of a number of chambers & tubes. These silencers are used to attenuate sound. Reactive silencers are designed to eliminate pulsations within the piping system generated by rotary positive blowers.