Wedge Gates: A solid wedge valve may be fitted in virtually any location and is suited for practically any fluid. It can also be used to turbulent flow. When employed in high-temperature applications, solid wedges are prone to thermal locking.
In addition t the primary force provided by fluid pressure, the tightening of the stem creates a significant wedging force on the seats, which aids in sealing. Due to reduced "rubbing" on the seats, the wedge-shaped gate does not stick to the seat in the event of a large fluid differential pressure. It also has a longer service life.
Parallel Expanding Gates: The mechanical expansion of the gate provides sealing in expanding gate valves, which feature two slab gates fitted together. The media can flow through both of the slab gate's cavities when they are elevated. The outward mechanical expansion required for a suitable seal is enabled by the upward push on one slab and the halting of the second slab by a step in the valve body.
Slab Gates: Slab gates, also known as through-conduit gate valves, are one-piece gates with a bore size hole in the middle. The bore is aligned with the two seat rings in the open condition. This alignment results in a smooth, turbulence-free flow. This one-of-a-kind design provides for little system pressure loss, making it ideal for transporting crude oil and natural gas liquids.
Knife Gates: Knife gate valves are used to control the flow of heavy fluids and dry bulk materials. The gate is usually made of a single piece of metal that is pointed. Because they pass the seat rings every moment they open or close, these valves are self-cleaning.
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