| 摘要 |
A pressure relief valve system comprises a fluid outlet 1 from a pressure vessel, a flexible expansion bellows 4 at an end of the fluid outlet remote from the pressure vessel, and a primary pressure relief valve comprising a valve seat and a valve lid7. The valve seat comprises a flange 5 and seal 6 mounted on the expansion bellows 4 and the valve lid 7 when closed forms a seal with the seat. A secondary pressure relief valve 11 receives fluid from a fluid off-take 13 and is connected by a pipe12 to a valve opening actuator 15. In the event of overpressure in the vessel, passage of fluid through the secondary pressure relief valve 11 causes the opening actuator 15 to operate to open the valve lid 7. |
