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LowFlow 708HP Series Fractional Flow Control Valve

  • High inlet pressure up to 552 bar
  • Union style body/bonnet connection - provides solid construction and secure connection
  • Cv values from 0.05 up to 1.25

LowFlow Mark 708HP series of fractional control valve is designed for high inlet pressures, up to 552 bar (8000 PSI). The compact and rugged control valve can be used across a range of research and industrial applications such as chemical processing, offshore chemical injection, hydrocarbon processing, high pressure hydraulic actuators and many other types of high pressure applciations.

Mark 708HP is available on in a DN15 (1/2”) size but offers a variety of process connections including threaded (FNPT), socket weld and autoclave AE. Optional materials of construction are also available for more demanding processes.

Cv values from 0.05 up to 1.25 are available for the Mark 708HP to allow linear and equal percentage flow characteristics.

LowFlow 708HP options and connections

Union style body / bonnet connection which provides a solid construction and secure connection. The metal 'C' ring gasket provides excellent sealing without exposing the bonnet threads to the media. The bonnet and actuator assembly may be removed with the valve body still in line which aids valve maintenance.

Mechanically loaded PTFE Chevron heavy duty V ring packing. The adjustable packing arrangement maintains a proper compression, while minimizing excessive friction.

PTFE packing is suitable for temperatures up to 232°C. Optionally mechanically loaded Graphoil may be used for higher temperature requirements.

Rolling diaphragm design ensures that the effective diaphragm area remains relatively constant, regardless of valve stem position. This increases accuracy of the actuator while positioning the valve by ensuring a linear response to input signal changes.

The guided trim, extended orifice and plug guiding are standard and offers improved shutoff and accuracy.

Other features

  • Seat Type: Globe – Class IV
  • Body Materials: Carbon Steel, Stainless Steel, Hastelloy C, Monel, Alloy 20, others
  • Ranges: 3-15 or 6-30 psi; split ranges are available with optional top-mounted positioner
  • Standard with side mount positioner
  • Optional top mounted positioner


The LowFlow 708HP Series Fractional Flow Control Valve is widely used in the following industries:

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Richards Industrials