The present invention relates to a hydraulic circuit mechanically linked to a panel (50) and agricultural harvesters comprising the same. The hydraulic circuit of the present invention can be used to facilitate the transition of hydraulic states from a quick speed to a slow speed, when opening and closing the panel (50). The hydraulic circuit comprises a fluid stop valve (A) comprising a restrictive orifice which, when narrowed, reduces the rate of pressurized fluid flow into a hydraulic actuator (110,200,300) during the actuator's extension. The reduced flow of pressurized fluid into the hydraulic actuator substantially reduces the speed at which the panel opens or closes.
