Valve for switching fluids, extinguishing system and method

A sectional valve (100) for an extinguishing agent line, with:

• a control valve and
• a working valve for pilot control by the control valve, with:
• a throttle bore (6) that establishes a first fluid connection between an inlet (25) of the valve (100) to be pressurized and a piston chamber (21) of the working valve, and
• a working piston (2) with a first end face disposed opposite the piston chamber that is larger than a second end face disposed opposite the inlet (25),
• wherein the control valve is configured to open and close a second fluid connection (22, 23) between the piston chamber (21) and an outlet (24) of the valve (100),
• wherein the control valve further has:
• a control valve seat (17),
• an anchor (5) that closes the second fluid connection (22, 23) together with the control valve seat (17) when pressed onto the control valve seat (17),
• a magnetizable core (35),
• a control spring (34, 34′) that generates a force to define a longitudinal axis,
• a permanent magnet (29) disposed proximate the magnetizable core (35),
• a magnet holder (28) disposed between the permanent magnet (29) and the magnetizable core (35), and
• a control coil (26) configured to exert a magnetic force on the anchor (5), such that the control coil (26) lifts the anchor (5) from the control valve seat (17) to an extent that the second fluid connection (22, 23) allows a greater flow than the first fluid connection,
• wherein the control valve is configured to variably position the core (35) along the longitudinal axis defined by the force generated by the control spring (34, 34′),
• wherein the magnet holder (28) is configured to permit removal of the permanent magnet (29) from the magnet holder (28), and the permanent magnet (29) and the magnet holder (28) are positioned on the sectional valve (100) to be exposed to an environment surrounding the sectional valve (100),
• wherein, during an actuation state, the permanent magnet (29) is held in or on the magnet holder (28) so that the permanent magnet (29) is contiguous with the magnet holder (28), and the permanent magnet (29) is configured to hold the anchor (5), lifted from the control valve seat (17), indirectly by the magnetizable core (35), during an absence of the magnetic force exerted on the anchor (5) by the control coil (26), and
• wherein the permanent magnet (29) is removable from the magnet holder (28) so that the permanent magnet (29) is noncontiguous with the magnet holder (28), and the removed permanent magnet (29) allows the control spring (34, 34′) to press the anchor onto the control valve seat (17) to terminate the actuation state.