Mark 708 Series – Fractional Flow Control Valve

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Product Overview

The Mark 708 Series provides accurate control on fractional flow applications. It is a complete line of pneumatic and electrically actuated control valves designed to enhance performance to ensure precision control on your most critical micro flow applications. The valve is ideal on pilot plant installations, test standards, R & D facilities, processing plants and specialized processing plants (dosing, injection and venting).

  • The rolling diaphragm design ensures that the effective diaphragm area remains relatively constant, regardless of valve stem position. This increases accuracy of the actuator when positioning the valve by ensuring a linear response to input signal changes.
  • The spring-loaded packing maintains a proper compression, while minimizing excessive friction. This alleviates the need for most field adjusting. The TFE packing is suitable for temperatures to 450°F (232°C), while braided or Graphite/Grafoil may be used for higher temperature requirements
  • The bolting provides solid construction and secure connection. This bolting adds ease to maintenance, as bonnet/actuator assembly may be removed from the valve body in-line.
  • The extended orifice and plug guiding are standard and offers improved shutoff and accuracy equivalent to heavy duty trim option of competitors ( not applicable to cv’s below 0.05)
  • The secondary stem connection eliminates stroke adjustment when changing trim facilitating faster, easier trim changes (not applicable to cv’s below 0.05).
Data Sheet
Installation & Maintenance Sheet
Product Overview