Cartridge valve Bosch Rexroth art. R901297535

General
The 2-way cartridge valves type LC2A (hereinafter referredto as “active logics” (2) are designed in compact modular design and basically consist of cartridge (control spool (3) and socket (4), intermediate cover (5) as fixed functional unit and a control cover type LFA (1) that is part of the Rexroth standard logics program. This control cover (separate order, see data sheet 21010 or 21050) establishes the connection with the pilot control valves and/or other hydraulic elements and thus integrates the most different functions – irrespective of the basic assembly. Virtually all standard and special control covers type LFA can be mounted. Optionally, the active logics (2) is available with position switch (6). By default, the “closed” position of the control spool (3) is recorded. The receiving hole for the position switch is provided as a standard. This means that the position switch “Q7” can be retrofitted at any time without requiring adjustments. In contrast to the logic assemblies with only one control area in the spring chamber (“passive logics”), the name “active logics” significantly stands for a version with differential spool, with at least one additional control area A4 (“two-level active logics”). This area allows for the opening and keeping open of the active logics (2) by means of pilot pressure (without the necessity of pressure in the main ports A or B). The spring chamber area A5 of the control spool (3) consists of the individual areas A1 + A2 + A4. Compared to passive logics without control area A4, this results in excess area which, with suitable hydraulic circuitry, offers advantages during closing and keeping closed (excessive force, closing velocity).
In general
Area total A5 = A1 + A2 +A4 = A3 + A4 The areas A1, A2 and A4 are effective in the opening direction, area A5 (and the spring force) in closing direction. So the resulting effective force determines the position and movement of the control spool (3). Usually, there are no interim positions in the directional function variants. The direction of flow is free and can thus be perfectly adjusted to the application. Active logics type LC2A are generally equipped with spool sealing and are therefore leakage-free inside. The seat area is hydraulically “tight”.
Active logics for directional function
Depending on the task, different control spool versions are possible. The active area can be connected with the available pilot oil guides in almost any way and in this way, most different functions can be realized with only 1 basic assembly.
Installation bore
The active logics type LC2A can be directly installed in a standard installation bore according to ISO 7368 (see dimensions). Thus, it is also suitable as retrofitting for existing “passive logics” that must be leakage-free inside or require position monitoring or faster closing times.
Type LC2A 025 …-1X/.Q7G24…
(with control cover type LFA . D… and monitoring of the closed position of the valve poppet)