Shear mechanism for backpressure relief in a choke valve

Details Shear mechanism for backpressure relief in a choke valve Shear mechanism for backpressure relief in a choke valve

2006-10-24

2006-10-24

Rivell, John (Department: 3753)

Fluid handling

Destructible or deformable element controlled

Destructible element

C137S071000, C137S797000, C251S082000, C251S282000

Reexamination Certificate

active

07124770

ABSTRACT:
The present invention relates to a mechanism for preventing damage to the actuator of a hydraulic choke valve in the event of excessive backpressure on the outlet of the choke. The backpressure relief device is applicable to a choke valve which meters flow from a high pressure annular region around the axially reciprocable choke throttling member into a low pressure exit channel coaxial with the throttling member. In particular, a shearable means is used to connect the reciprocable control shank of the actuator to the throttling valve member of the choke valve. In the event of excessive pressure on the exit channel of the choke valve, the shearable means will shear, thereby fully opening the valve and permitting the excessive pressure to escape. The shearable means is readily replaced so that the valve easily can be put back into operating condition.

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