Table of Contents
Advertisement
14/36
Bosch Rexroth AG
Information on this product
5.3
Product description
5.3.1 Function
The directional seat valve type M-2SMM6...SO711 / M-3SMM6...SO711 /
M-3SH6...SO712 is a directional seat valve with manual or fluid logics actua-
tion. It controls start, stop and direction of flow and basically comprises of the
housing (1), 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), in spool position by the relevant type of actuation (2). 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. Thus,
the valve system (3) is pressure-compensated in relation to the actuating forces
(actuation or return spring).
The directional seat valves have a "negative spool overlap". Therefore, port T
must always be connected. That means that during the switching process - before
the starting of the opening of one valve seat to the closing of the other valve seat -
ports P-A-T are connected with each other. This process takes, however, place
within such a short time that it is irrelevant in nearly all applications.
In order to switch the valve safely or maintain it in its spool position, the pressure
situation must be as follows: p
5.3.2 Section
5
2
6
Types of actuation see page 13
Fig. 1: Section type M-2S..6n...
M-...S...SO711/712 | RE 22340-B1/11.12
≥ p
≥ p
.
p
A
T
4
1
7
T
P
Advertisement
Table of Contents
