Pressure modulating valves for braking systems

A dual pressure modulating valve unit for a vehicle braking system comprising:

• a housing having a first and second bores therein, the second bore extending substantially parallel to the first bore;
• a first inlet port in the housing opening into said first bore for connection to a driver controlled source;
• a second inlet port in the housing opening into said second bore for connection to the driver controlled source;
• a first outlet port in the housing opening into said first bore for connection to one brake actuator;
• a second outlet port in the housing opening into said second bore for connection to another brake actuator;
• a first plunger slidable in the first bore to control communication between the first inlet port and the first outlet port;
• a second plunger slidable in the second bore to control communication between the second inlet port and the second outlet port;
• a beam pivotally connected adjacent one end thereof to the first plunger and adjacent the other end thereof to the second plunger;
• a pivotal connection on said beam intermediate the ends thereof;
• biasing means for applying a biasing load to said plungers;
• and thrust transmitting support means between said biasing means and said pivotal connection;
• said beam being pivotable between a normal mode in which the load of the biasing means is divided between said plungers, and an inactive mode in which under the condition of one only of said plungers being under fluid pressure, the load of the biasing means is transmitted in a direct line through the support means to said one plunger and not through said pivotal connection.