The Cameron FLS-S gate valve was designed for API 6A application using features from our FLS gate valve model, including forged construction, metal-to-metal sealing, slab-style gate, stem seal, and the seat design. The feature most beneficial of the FLS-S gate valve’s split gate design is the ability to perform a single dual-seat seal test. The split gate design is available for all FLS and FLS-R valve pressure ratings and bore sizes.
In contrast with the FLS gate valve, the FLS-S gate valve has two slab gates in the same valve cavity to allow a flowline seal test to be performed simultaneously on both flow directions. Depending on valve actuation methods (either manual or power actuated), the two gates are energized mechanically by applying torque or spring forces to create the initial sealing.
When performing the seal test, the two gates first are energized mechanically to create the initial sealing. Test pressure then is applied and relieved through the bonnet grease fitting located behind the stem backseat. The valve is not intended to be stroked when performing a dual-seal test at full working pressure. A true shear pin is located in the valve handwheel adapter to protect over-torque and ease pin replacement.