Modulating Control

  • MK708ME Electric

  • MK708ME is the new electric motor operated control valve in the MK708 low flow series. It’s light, compact, has quick change trim (Cv 0.00001 to 4.0), Ansi shut-off Class IV or VI. Voltages include 115, 120, 230 & 400VAC, as well as 24vDC. The motor can be positioned using the stowable crank handle for manual operation or analogue input signals of 0-10 VDC, 4-20mA, split range current signals or fieldbus.

    Upon loss of command signal, the motor is designed to either lock in place , or fail to minimum input signal position. 4-20mA feedback is available. (relies on customer supplying power and wiring)



  • MK70 Pneumatic Control Valve

  • MK70 is a diaphragm operated Control Valve manufactured in the US by Jordan Valve. The valve is metal/metal seated (Ansi class IV) and utilises the same sliding gate seats found in Jordan’s range of Pressure Regulators (MK50/MK60) and Temperature Control Valves (MK80).

    It is available in sizes ½”→ 2” (Cv 2.5 to 30) and up to 6″ in model 711. The standard valve has threaded (BSPT or NPT) but can be flanged on request. The valve is actioned by a multi-spring pneumatic actuator and can be used for on/off or modulating for liquids, gases, chemicals and steam. Flow is controlled by the movement of the gate/disc which moves in response to a 3-15 psi pneumatic signal received from a controller. Where the signal is in milliamps, an I/P transducer can be fitted (i.e. converts a 4-20mA signal to 3-15 psi) or, for even more precise control, the pneumatic actuator can be fitted with a pneumatic or I/P positioner.

    Maximum inlet pressure- BZ (34 bar) / DI (68 bar) / WCB (102 bar)/ 316SS (99 bar)
    Maximum temp- BZ/DI (343°C)/ WCB/316SS (343°C)
    Max pressure differential: 8.6-17.2 bar (without positioner), 8.6-24.1 bar (with positioner)

    * Options: MK701/702 Cv 50/70 High Flow version, equal % seats, low flow seats for all sizes, side or top mounted positioner, flanges to AS or Ansi. Many more options, flanged MK711 (sizes to DN150)



  • MK75 Wafer Pneumatic Control Valve

  • MK75 is a wafer body pneumatic control valve, featuring sliding gate design in a lightweight, compact body, dramatically reducing the size and weight of conventional control valves.

    Sizes – 1” → 6” (Cv’s 9.5 to 400), Class 150/300
    Size- 8” (Cv 400), Class 150

    Maximum differential pressures vary, depending on valve size, actuator selected (35M/55M/85M) and whether with or without positioner (see download sheet)



  • MK708 Pneumatic Control Valve

  • Jordan MK708 and MK8000 are globe style, low flow, pneumatic control valves, either cast or machined from barstock. They are operated by a multi-spring pneumatic actuator. Top or side mounted positioners are fitted where greater accuracy is required or where high pressure differentials occur. Many combinations of body/trim material available, hard or soft seat (for MK708 when zero seat leakage required)

    Mk 708 – ¼”→ ¾” (Cv’s 00001 to 4.0), class IV or VI shut-off, max WP & DP 5,000 psi
    Mk 8000 – ½”→ 2” (Cv’s 0.05 to 16.0) class III or IV shut-off, WP to 6,000 psi (414 Bar), Max differential Pressure to 5,000 psi

    * Options: MK8000 is avail in almost any exotic material, including PVC and Kynar, also 3-way version



  • 3-8 V-Port Ball Valve with Positioner

  • Standard full or reduced port Ball Valves are unsuitable to use for modulating control due to their large Cv’s and can result in poor control through most of their opening/closing range. However, a V-port or V-notch Ball valve has significantly reduced Cv values and when used in conjunction with an actuator and I/P positioner, can be used as an economically priced control valve for modulating duty.

    Components for modulating assembly are:
    Valve- Apex 3-8T, 3-piece 30° or 60° V-port, 1,000 psi (69 bar) Ball Valve, ISO5211 direct mount, 316ss body/ball/stem, TFM1600 seats, PTFE seals, bsp ends (SW or BW optional)
    Sizes- ½” (DN15) → 2” (DN50)
    Actuator- Prisma PA series DA or SR (if fail open/close required)
    Positioner- YT-1000R (positions in response to 4-20mA signal)
    Piping- Generally ¼” st/steel tube with Hylok tube fittings (nylon tube with plastic fittings optional), Filter Regulator and Pressure Gauges