{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
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  "description": "A pneumatic brake actuator comprising a spring brake actuator with a spring chamber and a spring brake pressure chamber, a service brake actuator coupled with the spring brake actuator including a service brake pressure chamber and a pushrod chamber, a valve body with an interior surface that…",
  "path": "/patents/926121",
  "publishedAt": "2017-05-31T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T13/38",
    "HALDEX BRAKE PRODUCTS CORP [US]"
  ],
  "textContent": "A pneumatic brake actuator comprising a spring brake actuator with a spring chamber and a spring brake pressure chamber, a service brake actuator coupled with the spring brake actuator including a service brake pressure chamber and a pushrod chamber, a valve body with an interior surface that defines a channel between the spring chamber and the service brake pressure chamber and a seal positioned within the channel in the valve body. The seal and the valve body enclose a valve chamber that is not in fluid communication with the spring chamber or the service brake pressure chamber. The seal is moveable between an open position, in which fluid can flow through the channel, and a closed position, in which fluid is blocked from flowing through the channel. The seal is biased to the open position and comprises a first sealing surface that engages the valve body, when the seal is in its closed position, as well as second and third sealing surfaces engaging the valve body to seal the valve chamber from the spring chamber and the service brake pressure chamber.",
  "title": "PNEUMATIC BRAKE ACTUATOR WITH FLOW INSENSITIVE TWO WAY CONTROL VALVE"
}