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15.07.2013

Product Portrait

4-circuit protection valves for trucks, trailers and buses

AD9z6v8-X5E

The DT Spare Parts brand offers a complete range with more than 30 000 different spare parts for trucks, trailers and buses, including all standard 4-circuit  protection valves.

The DT brand products, made of high quality materials, meet your highest quality requirements and guarantee a long period of use.

The 4-circuit protection valve isolates the individual circuits of the air pressure braking system from each other. Protection of pressure in the intact braking circuits is thereby ensured if one or more brake circuit fails due to pressure loss. A total failure of the brakes is thus prevented.

The 4-circuit protection valve is also responsible for supplying compressed air to the four braking circuits. The compressed air is distributed in a specific  order. The two brake circuits for the front and rear axles are supplied with the necessary operating pressure first. Only then follows the supply to the circuits for the handbrake and auxiliary equipment (e.g. the pneumatic suspension). This ensures that the parking brake can only be released when both service brakes are operational.

DT-Technic Info

DT Spare Parts brand 4-circuit protection valves are made of coordinated materials which ensure reliable operation as well as a long service life.

Furthermore, DT Spare Parts 4-circuit protection valves are subjected to a leakage test. The accurately fitting connectors ensure unproblematic installation.

In addition to all standard 4-circuit protection valves, the comprehensive DT range also includes a variety of repair kits.

Construction of 4-circuit  protection valves

  1. Lower valve body
  2. Middle valve body
  3. Upper valve body
  4. One way valve
  5. Seal
  6. Piston
  7. Spring
  8. Spring seat
  9. Regulator spring
  10. Location ring
  11. Diaphragm
  12. Screw locking varnish

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