Mark 15 Top Mounted Pneumatic Valve Positioners0 pages

Jordan Valve, a Division of Richards Industries
3170 Wasson Road • Cincinnati, Ohio 45209
Telephone 513-533-5600 • Fax 513-871-0105
Toll-FreeTelphone: 800-543-7311 (U. S. A. & Canada)
E-Mail: info@richardsind.com • URL: www.jordanvalve.com
Mark 15
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 singleaxis,
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.
Each positioner receives a signal from a control instrument,
and using an air supply as high as 50 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.
Valve Positioners Mark 15 Top Mounted P/P Positioners
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
• Can be direct-mounted to top of pneumatic
actuator
• Offers a smaller, more streamlined package with
no external linkage