Mark Eight Control Valves

The Flowserve Mark Eight control valve is designed with a unique Y style globe body that provides higher flow capacities and less process turbulence than conventional globe valves.

Because of its nearly straight through flow passage, the Y style body is less flow restrictive than a normal globe-style body. This permits less pressure to be converted into velocity as the fluid passes through the seat, resulting in a lower valve recovery factor and higher capacity. Mark Eights straight-through design generates less valve and piping turbulence which significantly reduces harmful noise and vibration levels.

Like Flowserves Mark One globe valve, the Mark Eight features streamlined, constant area flow passages, top-entry trim, a four-way positioner, and a high thrust cylinder actuator. The Mark Eight is completely interchangeable with the Mark One except for the body, seat retainer, bonnet, and plug. The packing box, actuator, seat ring, flanges, and gaskets are all standard, off-the-shelf items for fast delivery and minimal parts inventory.

Features

• Straight-through flow allows higher Cv per given size over globe style valves
• Less restriction through seat permits less line turbulence
• Interchangeable part with other Mark series valves for less inventory
• Accurate, high thrust cylinder actuator to shut off against high pressure drops