Mark 708 Series Fractional Flow Control Valves
Precision Control, Fractional Flow Control Valve
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).
Seat Type: Globe – Class IV or VI
Sizes: 1/4″ – 3/4″ (DN8 – DN20)
End Connections: Threaded, Socket Weld, Integral Tube, Welded Flange
Body Materials: Carbon Steel, Stainless Steel, Hastelloy C, Monel, Alloy 20, others
Cv (Kv): 0.00001 to 4.0 (0,000009 to 3,4)
Ranges: 3-15 or 6-30 psi; split ranges are available with optional positioner
Utility Valves Repair Videos
We have designed a series of short videos to educate users about maintaining and installing our products.
- CRN Number
- ATEX Certified
1/4″ MK708 with A105 CS Barstock, Hastelloy C, WCB CS, CF8M SS, or 316/316L SS Barstock with Integral Tube 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 BSPP 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 BSBT 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, WCB CS, CF8M SS, or 316/316L SS Barstock with Integral Tube ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with BSPT Ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with BSPP Ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with NPT Ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock, Hastelloy C, or 316/316L SS Barstock with FSW Ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with BSPP ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with BSPT ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with NPT ends and 14M Actuator and MK16IQ Positioner
1/4″ MK708SP with A105 CS Barstock or CF8M SS with FSW ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPP ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSBT ends and 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 and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with NPT ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with FSW ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with Integral Tube ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with BSPP ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with BSPT ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with 300#FE ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with 150#FE ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with PN16 ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with NPT ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with FSW ends and 14M Actuator and MK16IQ Positioner
1/2″ MK708SP with WCB CS or CF8M SS with Integral Tube ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPP ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with BSPT ends and 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 and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with NPT ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with A105 CS Barstock, Hastelloy C, 316/316L SS Barstock or Alloy 20 with FSW ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with BSPP ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with BSPT ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with 300#FE ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with 150#FE ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with NPT ends and 14M Actuator and MK16IQ Positioner
3/4″ MK708SP with WCB CS or CF8M SS with FSW ends and 14M Actuator and MK16IQ Positioner
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