Description Size 10, 6 Component series 3X Maximum operating pressure 420 / 630 bar Maximum flow 40 l/min Features Direct operated directional seat valve with manual actuation Porting pattern according to DIN24340, form A ( without locating hole) Safe switching also with longer standstill periods under pressure Operating methods: manual (hand lever) Inductive position switch (contactless), optional Product description 2/2 and 3/2 directional seat valve General The directional valve of the M-.SMM type is a directional seat valve with manual, mechanical operation. 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 principle In 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). Therefore, 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 blocked Type M-2S.. 6 N… Type M-3S.. 6 U… 4/2 directional seat valve The use of the Plus-1 plate and the seat arrangement offer the following options: With 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 position The 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
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