Cross partner, LowFlow Valve, a division of Richards Industrials, produces the Mark 708 Series fractional flow control valve, specifically engineered for ultra-low flow rates and precision dosing where standard control valves hunt or fail. Capable of controlling micro-flows with Cv ratings ranging from 0.00001 up to 4.0 across 1/4″ to 3/4″ line sizes, the Mark 708 utilizes a rolling diaphragm actuator design that maintains a constant effective surface area for linear stem response and high position repeatability. Guided trim and extended plug guiding come standard, providing tight shutoff (up to ANSI Class VI) and eliminating stem flex during precise modulation.

Designed with a compact footprint, the Mark 708 integrates into crowded analytical enclosures, OEM dosing skids, and pilot plant systems. The valve features quick-change trim technology, allowing operators to change trim sets in-line without recalibrating the actuator or removing the valve body. Offered in 316L stainless steel, Hastelloy, Monel, Alloy 20, and Titanium, the Mark 708 withstands corrosive chemical injection, high-pressure sampling, and high-temperature research environments, ensuring accurate chemical dosing that protects end-product quality and reduces additive waste.