Abstract: A suction valve for a pipe line in which a medium flows is provided, whereby the flow can be closed and regulated and whereby back flow prevented. The suction valve includes a movable a closing mechanism (3) placed in a valve house (1), and an opposed counter face in the valve house. The closing mechanism (3) can be moved by the pressure of the medium flow by forming the closing mechanism (3) to be as piston parts or cylinder parts in a working cylinder. The pressure of the medium flow used for moving the closing mechanism (3) is led into the closing mechanism through an outlet valve (8,9,10), which outlet valve is fitted inside the closing mechanism (3).

Abstract: An arrangement in combination with an oscillating cylinder (1), whereby the arrangement includes a working valve (10) of cylinder (1) to transmit pressure medium into cylinder (1), impulse valves (5) by means of which, by working valve is controlled, control means (4), as discs, from movable piston rod (18) to cylinder (1) outside, which can be arranged to get in several different linear positions in contact with the control means impulse valves (5) in order to produce a stroke length set for the piston rod of the oscillation cylinder. In the arrangement the impulse valves are placed sideways outside control means (4) and the required impact to be achieved from the control means (to the impulse valves (5) is moved by means of special arms (13) moved from control means (4) as an opening/closing motion of the shut-off part of the impulse valves whereby the structural length of the oscillating cylinder can be achieved essentially shorter in the cylinder back end of control means (4), (5).

Abstract: A control system of a pneumatic oscillation cylinder (1) to produce the oscillating motion of a scraper (3) used in paper machines in particular. There is in the oscillation cylinder motion rod (18) motion stoppers (4), which in both wanted reversing points of the rod (18) motion open an own pressure discharge valve (5) for the said stopper in the pilot operation line (9), whereby the opening of both pressure discharge valves (5) in turns causes a reversing function in a pneumatic reversing valve (10) known as such.