Also named as "brake" or "hydro-check" they control their speed of advance maintaining it constant. Used mainly to regulate and to specify the mechanical advance of the pneumatic cylinders and devices; allowing them to obtain easily the approximation stage at fast speed. Basically they consist of a hydraulic cylinder in a closed circuit that receives the force of the device to control. It contains for it, regulators for the advance and a compensator of volume for the oil.

Minimum force and Maxima to regulate. 18 and 800 daN adjustable speed between 0.06 and 9 m/min. speed in the sense of recovery: up to 12 m/min. Operating temperature: of -15ºC up to 90ºCs

The speed control is sold in two versions: the 'conventional', the economic one, for a given regulation in which the speed depends on the load (force applied by the device to control) as it is indicated in the graph. The other version goes provided with a compensated speed governor that allows a constant advance independently of the load - when this one surpasses the value of 80 daN -.

Cadence of operation.- Its maximum power is equivalent to its capacity in receiving energy without exceeding the Maxima temperature of operation. It comes certain by the formula:

 F x C x N = 760,000 (atmosphere to 20ºCs) 

F- Force to regulate (daN) 

C- race (mm) 

N- Amount of races regulated per minute.

Reference for proision

Using additional refrigeration, for example, the leaking in pneumatic distributors, its power increases considerably.