Solenoid-controlled valve arrangement

A solenoid-controlled valve arrangement for use in a brake system equipped with a skid-protection system, said solenoid-controlled valve arrangement being connected behind a fluid pressure control means for controlling a pressure input to at least one brake actuator, said solenoid-controlled valve arrangement comprising:

• (a) a relay valve having a control line and an operating exit port connected to a fluid pressure supply line of such at least one brake actuator;
• (b) a solenoid-controlled shifting valve positioned in said control line, said solenoid-controlled shifting valve having an energizable magnet, said solenoid-controlled shifting valve blocking said control line and connecting a portion of said control line which is located downstream of said solenoid-controlled shifting valve with an overpressure-free pressure release area when said energizable magnet is energized;
• (c) a solenoid-controlled shut-off valve positioned in said control line of said relay valve upstream of said solenoid-controlled shifting valve, said solenoid-controlled shut-off valve having an energizable magnet, said solenoid-controlled shut-off valve blocking said control line when said energizable magnet is energized;
• and
• (d) a one-way by-pass line having a first end thereof connected ahead of said solenoid-controlled shut-off valve and a second end thereof connected behind said solenoid-controlled shifting valve for by-passing each of said solenoid-controlled shifting valve and said solenoid-controlled shut-off valve on a direction of a flow of said fluid pressure to said fluid pressure control means.