Mark 708 Series Low Flow Pneumatic Control Valve

The Mark 708 was developed to provide 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 (0,000009 to 3,4 Kv in sizes DN8 through DN20), the Mark 708 offers design features that will provide enhanced performance to insure precision control on your most critical micro-flow applications.

Minimum Data Requirements to Size Valve

  • 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
Mark 708 Series Data Sheet

Installation & Maintenance Sheet
Mark 708 Series Installation and Maintenance Manual
MK16IQ Series Trouble Shooting Guide
MK16IQ Series Positioner Set-up Guide

Charts
CV VS Lift Chart

Condensed Catalog
Product Guide
Product Guide – A4

How to Change the Trim and Packing on a Mark 708 Series Valve

The Mark 708’s Proven Success

1/4″ MK708 with A105 CS Barstock, Hastelloy C, WCB CS, CF8M SS, or 316/316L SS Barstock with Integral Tube Nuts and 14M Actuator
1/4″ MK708 with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with BSPP ends and 14M Actuator
1/4″ MK708 with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with BSPT ends and 14M Actuator
1/4″ MK708 with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with NPT ends and 14M Actuator
1/4″ MK708 with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with FSW ends and 14M Actuator
1/4″ MK708 with WCB CS or CF8M SS with BSPP ends and 14M Actuator
1/4″ MK708 with WCB CS or CF8M SS with BSPT ends and 14M Actuator
1/4″ MK708 with WCB CS or CF8M SS with NPT ends and 14M Actuator
1/4″ MK708 with WCB CS or CF8M SS with FSW ends and 14M Actuator

1/2″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock, or Alloy 20 with BSPP ends and 14M Actuator
1/2″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock, or Alloy 20 with BSPT ends and 14M Actuator
1/2″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock, or Alloy 20 with NPT ends and 14M Actuator
1/2″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock, or Alloy 20 with FSW ends and 14M Actuator
1/2″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock, or Alloy 20 with Integral Tube Ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with BSPP ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with BSPT ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with 300#FE ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with 150#FE ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with PN16 ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with NPT ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with FSW ends and 14M Actuator
1/2″ MK708 with WCB CS or CF8M SS with integral tube ends and 14M Actuator

3/4″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPP ends and 14M Actuator
3/4″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPT ends and 14M Actuator
3/4″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with 150#FE ends and 14M Actuator
3/4″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with NPT ends and 14M Actuator
3/4″ MK708 with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with FSW ends and 14M Actuator
3/4″ MK708 with WCB CS or CF8M SS with BSPP ends and 14M Actuator
3/4″ MK708 with WCB CS or CF8M SS with BSPT ends and 14M Actuator
3/4″ MK708 with WCB CS or CF8M SS with 300#FE ends and 14M Actuator
3/4″ MK708 with WCB CS or CF8M SS with 150#FE ends and 14M Actuator
3/4″ MK708 with WCB CS or CF8M SS with NPT ends and 14M Actuator
3/4″ MK708 with WCB CS or CF8M SS with FSW ends and 14M Actuator

1/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock, WCB CS or CF8M SS with integral tube ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C or 316/316L SS Barstock with BSPP ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C or 316/316L SS Barstock with BSPT ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C or 316/316L SS Barstock with NPT ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C or 316/316L SS Barstock with SW ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with BSPP ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with BSPT ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with NPT ends with 14M actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C or 316/316L SS Barstock with FSW ends with 14M actuator and MK16IQ Positioner

1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPP ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPT ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with 150#FE ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with NPT ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with FSW ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with integral tube nuts with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with BSPP ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with BSPT ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with 150#FE ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with 150#FE ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with PN16 ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with NPT ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with FSW ends with 14M actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with integral tube nuts with 14M actuator and MK16IQ Positioner

3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPP ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPT ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with 150#FE ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with NPT ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with FSW ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with BSPP ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with BSPT ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with 300#FE ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with 150#FE ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with NPT ends with 14M actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with FSW ends with 14M actuator and MK16IQ Positioner

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