| 摘要 |
<p>Compression relief valves are connected to compression chambers of engines and compressors. Adding a manual relief feature to known automatic compression relief valves involve increased complexity and requires high manual effort to overcome the high automatic spring force. The subject compression relief valve includes an automatic relief valve (74) which is activated by an excessive pressure within the compression chamber (12) and a manual relief valve (90) which is actuated independently of the automatic relief valve (74). The automatic valve (74) relieves the excessive pressure within the chamber (12) when the pressure within the chamber (12) overcomes the high force of the spring (88), unseating the valve element (76, 134) from the seat (42) and allowing the excess pressure to enter a bore (44) in the body and escape through a radial passage (46), an annular chamber (40) and a passage (24) to the atmosphere. The manual valve (90) is actuated by manually moving a handle (112) against a low effort spring (122) to an open position. At the open position the chamber (12) is vented through passages (50, 94, 96) or through passage (132, 138) into an annular chamber (40) and out a passage (24) to the atmosphere. The handle (112) can also be rotated and locked in the open position. Thus the chamber (12) is relieved of excessive pressure exceeding a predetermined level by the automatic valve (74) and is selectively vented with the manual valve (90). The subject compression relief valve provides a manual relief valve (90) requiring a low effort to actuate and an automatic relief valve (74) to relieve excessive pressure from a chamber (12). The manual valve (90) and the automatic valve (74) are coaxial to reduce the complexity of the compression relief valve.</p> |
