MK708 Fractional Flow Control Valves
The Mark 708 provides the most accurate control available for fractional flow services: whether for pilot plant installations, test stands, R & D facilities, or for specialized processes such as dosing, injection and venting applications.

With Cv's ranging from 0.00001 to 4.0 available in 1/4" through 3/4" line sizes, the Mark 708 offers design features that will provide enhanced performance to insure precision control on your most critical micro-flow applications

MK708 Cryogenic Series Fractional Flow Control Valves
The Mark 708 for cryogenic service features a 9" bonnet extension that provides protection for the packing and actuator by preventing ice build-up, which can interfere with movement of the valve stem and affect valve performance. For cryogenic services with temperatures as low as -425°F (-254°C).

MK708 Finned Bonnet Fractional Flow Control Valve
The cooling fin bonnet option is for the protection of the stem packing and elevated temperature associated with steam, hot water, and high temperature oil, gas and liquid services. The finned bonnet cools the area around the packing, which permits the use of standard packing materials that otherwise would not be suitable for the service temperature conditions.

MK708 Bellows Seal Fractional Flow Control Valves
Bellows stem seals eliminate fugitive emissions by surrounding the valve stem with a pressure-tight barrier, isolating the stem from the process fluid and preventing leakage to the atmosphere. For an extra meaure of protection, the bellows stem seal option provides a back-up seal of Teflon, braided or Graphite/Frafoil packing along with a detection port for use in monitoring potential emissions leakage.

MK709 3-Way Fractional Flow Control Valves
The Mark 709 is a lightweight control valve for use as a mixing valve in a low flow process applications. Featuring a three-way body design, it is constructed with two inlets to blend two separate flow streams into a common outlet, creating a third fluid. Available in sizes 1/2" and 3/4" (DN15 and DN20).

MK8000 Fractional Flow Control Valves
The Mark 8000 Series is a group of heavy-duty control valves specifically designed for process applications requiring full flow or fractional flow control. available in a wide selection of body sizes and styles, this valve can be configured in two way or three way designs, for diverting or mixing service, and with globe or angle valve style seats. The Mark 8000 Series valve subassembly is manufactured completely from barstock, which combined with the standard heavy duty yoke and actuator, gives the valve the ability to handle pressure up to 6000 psi (414 bar), while still being able to offer Cv's ranging from 0.05 – 17.