These accessories are a range of devices for completing a pneumatic circuit. these valves, with their special functions, are inserted between two valves, between a valve and a cylinder, or following a cylinder.
One of the particular characteristic of these accessories is that they are automatically actuated without the need for external commands. usually, operation and idle are controlled by the presence or absence of pressure as, for example, in the case of quick exhaust valves which pilots itself as a selector, changing the flow direction as the signal goes off and on.
On the other hand, other components are inert. that is, they do not have any internal variable function which is sensitive to pressure.
Among these components are silencers, manifolds and flow regulators. There are also the flow regulators, which like electronic components, can be defined as variable resistences. They are fundamental in regulating the flow rate, provide precise timings and regulate the cylinders’ speed.
The selector valves, with “AND” and “OR” functions, are logic functions components which often are an essential element. Furthermore, they are built to allow high flow rate which cannot be obtained by classic pneumatic logic.
The block valves lock the cylinder in a position, avoiding unexpected depressurization of the cylinder’s chamber due to lack of compressed air at the inlet port. Practically, it is a piloted unidirectional valve that blocks the exhaust port when there is no air in the pilot circuit.
Finally the economizer valves are in fact a pressure reducer valves installed between valve and cylinder for reducing the air consumption.
For example this is applicable on the cylinder return stroke without penalizing the exhaust as happens with FRL pressure regulator.
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