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Mark 15 Series
Top Mounted Pneumatic Valve Positioners
The Mark 15 positioner uses the full force of its air
supply to drive and maintain a pneumatic actuator to
position a valve to what is required by control
instrument, regardless of the presence of forces that
change valve position.
This line of compact instruments incorporates a
single-axis, force-balance principle of operation to
ensure accurate and stable control valve positioning. In all cases, including bottom-loading applications, a MK15 is mounted directly on the topworks of
the valve, with no external levers or other exposed
mechanisms.
Valve Positioners Mark 15 Top Mounted P/P Positioners
Each positioner receives a signal from a control
instrument, and using an air supply as high as 45
psig (3,4 bar), the positioner strokes the valve
actuator to the required position.
Like all valve positioners, the MK15 has feedback
circuits designed to measure the position of the
actuator’s piston or diaphragm. The positioner then
supplies or exhausts air to bring the actuator within
the required range for its corresponding control
instrument.
The position of the valve actuator is sensed by the
amount of compressive force exerted by a spring on
the valve positioner’s diaphragm assembly. By selecting the appropriate spring from the wide
selection available almost any combination of valve
stroke (from 1/4” to 4”; 6,4mm to 102mm) and instrument spans of 6,12, and 24 psi (0,4, 0,8 and 1,7 bar)
can be obtained.
Features
• Single-axis, force-balance principle of
operation, ensures accurate and stable
positioning
• Feedback circuits direct the actuator’s
position, ensuring adherence to the
control instrument signal
• Accommodates a wide variety of valve
strokes and instrument spans
• Direct-mounted to top of pneumatic
actuator
• Offers a smaller, more streamlined pack-
age with no external linkage
Steriflow by Jordan Valve
3170 Wasson Road • Cincinnati, OH 45209
513.533.5600 • 800.543.7311 • 513.871.0105 (f)
sterifl[email protected] • www.steriflowvalve.com
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Mark 15 Top MounTed pneuMaTic ValVe posiTioners
MK15/0910/5K/AB
speciFications
Input: 3-15, 6-30, 3-9 or 9-15 psi (0,2-1,0; 0,4-2,1; 0,2-
0,6; or 0,6-1,0 bar )
AirSupplyPressure:
• 35 – 45 psi reverse acting 3-9 / 9-15 / 3-15 / 6-30
ranges
• 20 – 25 psi direct acting 3-9 / 9-15 / 3-15 ranges
• 35 – 45 psi direct acting 6-30
Output: 0-100% supply pressure
OperatingTemperatureLimits: -40°F to +180°F (-40°C
to + 82°C)
Air Consumption (@20 psi): 0.25 scfm; (@ 1,4 bar:
0.0007N/m3)
FlowCapacity: 4.4 scfm (0.125N/m3) (for 3-15 psi output
pressure change) (0,2-1,0 bar)
Repeatability: 1/2% of full stroke
Sensitivity: responds to control air pressure changes as
small as 0.1% of full range
Dimensions
3.5"
8.89cm
4.625"
11.74cm
2.0"
5.08cm
HowtoOrder
1. See Mark 978 Control Valve model order grids
2. Select the appropriate base valve model. See mod-
els 978TP (TP for Top Mounted Positioner)
Connections: 1/4” FNPT
Dimensions: 4.65”H x 3.5” Diameter (117,6mm x
88,9mm); external dimensions when mounted
NetWeight: 2-1/2 pounds (1,1 Kg)
The topworks of the valve must have six, 1/4-20 x 9/16
deep holes (minimum) blind tapped, equally spaced on a
03,000 B.C. for mounting positioners.
Steriflow, a division of Jordan Valve
3170 Wasson Road • Cincinnati, OH 45209
513.533.5600 • 800.543.7311 • 513.871.0105 (f)
sterifl[email protected] • www.steriflowvalve.com
Steriflow Valve reserves the right to make revisions to its product, specifications, literature and related information without notice. Please visit our
website at www.steriflowvalve.com for the latest information on our products.
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