FCD（Flow Control Door）is a patented product of our company, it’s upgraded from presented three ways valve, it’s installed on top of ESP discharge head. The basic function is similar with presented products, however the new design upgraded the operation program and optimized the seal feature. It’s more reliable and durable:
FCD-Flow Control Door Functions:
Start ESP: Use the pump pressure to push centralizer mandrel to close the annulus completely, then open the central check valve. the flow go through the centralizer pipe to tubing.
Benefits: Avoid the pressured well fluid washing out the seals of side door.
Stop ESP: Its’ core mechanical logic is to make full use of the liquid column pressure to close central check valve firstly , then open the annulus side door.
Benefits he side door will be opened quickly by the reset spring and tubing liquid column pressure, avoid the presented products 'disadvantage----check valve is not closed completely, the tubing liquid column flow wash out the side door’s seals.
■Door frame——Sliding sleeve body
■Sliding door——Centralizer mandrel
■Latch——Control anchor jaw
■Key——Central check valve
■Reset spring ， Sealing element ， Valve seat, etc.