Bosch Rexorth Directional seat valve M-3SH 6 C3X/420 SO232 R900215754 Rexroth

Bosch Rexorth Directional seat valve M-3SH 6 C3X/420 SO232 R900215754 Rexroth2/2 and 3/2 directional seat valveThe directional valve of the M-.SH type is a directional seat valve with fluidic actuation. It controls start, stop and direction of flow and basically comprises of the housing (1), type of actuation (2), the hardened valve system (3) as well as the ball/the spool (4) as closing element.Basic principleIn the initial position, the ball/the spool (4) is pressed onto the seat by the spring (7), and by the relevant type of actuation (2) in the switching position. The actuation force acts via the ball (5) on the actuating plunger (6) that is sealed on two sides. The chamber between the two sealing elements is connected to port P. Therefore, the valve system (3) is pressure-compensated in relation to the actuating forces (actuation or return spring). Thus, the valves can be used up to 630 bar.Notice!3/2-directional seat valves feature “negative spool overlap”. Therefore, port T must always be connected. That means that during the switching process – from the start of the opening of one valve seat to the closure of the other valve seat – ports P–A–T are connected with each other. However, this process takes place within such a short time that it is irrelevant in nearly all cases of use.Attention!It is to be ensured that the maximum flow indicated is not exceeded! If applicable, a throttle insert for flow limitation is to be inserted (see functional description)The seat arrangement offers the following options: 2/2 directional seat valve Symbol “P” Initial position P and T connected Spool position P blocked Symbol “N” Initial position P blocked Spool position P and T connected 3/2 directional seat valve Symbol “U” Initial position P and A connected, T blocked Spool position P blocked, A and T connected Symbol “C” Initial position P blocked, A and T connected Spool position P and A connected, T blockedType M-2S.. 6 N…Type M-3S.. 6 U…4/2 directional seat valveWith a sandwich plate, the Plus-1 plate, under the 3/2 directional seat valve, the function of a 4/2 directional seat valve is achieved.Function of the Plus-1 plate:Initial positionThe main valve is not operated. The spring (9) holds the ball (4.1) on the seat (11). Port P is blocked and A is connected to T. Apart from that, one control line is connected from A to the large area of the control spool (12), which is thus unloaded to the tank. The pressure applied via P now pushes the ball (13) onto the seat (14). Now, P is connected to B, and A to T.Transition positionWhen the main valve is actuated, the spool (4.2) is shifted against the spring (9) and pressed onto the seat (15). During this, port T is blocked, while P, A, and B are briefly connected to each other.Spool position:P is connected to A. As the pump pressure acts via A on the large area of the control spool (12), the ball (13) is pressed onto the seat (16). Thus, B is connected to T, and P to A. Th