Mark 80 Self-Operated Temperature Regulators0 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 80
Self-Operated Temperature
Regulators
The MK80 Series is completely self-operated and requires
no external power source or other expensive instrumentation
to operate the valve.
The operation of the MK80 is fairly simple. A pre-measured
amount of liquid fill is drawn into the thermal system
filling the upper diaphragm chamber, the capillary tube,
and most of the bulb. As the controlled temperature increases,
the volatile liquid fill in the sensing bulb begins to
vaporize and creates pressure on the sealed system. This
pressure drives the valve stem, closing direct acting
valves, or opening reverse acting valves.
Because of the shorter stroke length of the sliding gate
seats, the MK80 is able to utilize a sealed actuator with
a stainless steel diaphragm, and does not require a
bellows to operate. To seal the actuator, the upper and
lower casings and diaphragm are heli-arc welded around
the circumference to create a solid bond. This seal
eliminates the need for any type of gasket. All sealing
surfaces on the MK80 are metal to metal.
Accurate temperature control begins with a reliable
actuator.
A temperature regulator is only as good as its actuator
and a great deal of research has gone into the development
of Jordan’s stainless steel SWA actuator. That is
why the SWA, combined with Jordan’s sliding gate regulator
design, provides the finest temperature control
available in a self-operated design. Among the features
of the SWA actuator:
• Heliarc welded construction: the upper and lower casings,
and diaphragm, are heliarc welded around the
circumference to fuse a solid bond and eliminate the
need for a gasket, a common source for leakage.
• Stainless Steel diaphragm: pre-formed from AISI 347
SST to eliminate rupturing caused by metal fatigue
brought about by constant stress, the most common
failure in bellows actuators.
• Sensitive control: because of the stroke length, the
span of an SWA is about 1/3 that of a typical bellows
actuator.
Temperature Regulators Mark 80 Self-Operated Temperature Regulators
• Simple replacement: attached to the yoke by just
four screws, the actuator can be replaced in less than
five minutes. Control ranges can be changed with
the valve in line by simply replacing the actuator.
• Liquid/vapor thermal system: to obtain the force
needed to position the valve seats, Jordan uses a
liquid/vapor thermal system that is capable of delivering
far more operating power than the simple liquid
expansion systems used on other temperature regulators.
As the sensed temperature increases, the
liquid fill in the bulb begins to vaporize and creates
pressure within the sealed system. This pressure,
exerted on the diaphragm, drives the valve stem to
modulate the valve seats to the proper position.
FEATURES
• High rangeability — controls flows from 5% to 100%
of rated capacity
• Sliding gate seats provide —
— Straight-through flow for reduced turbulence
and quiet operation
— Short stroke for fast response and accurate
temperature control
— Easily interchangeable Cv’s
— Tight shutoff due to overlap of seat closure
area
• Available with capillaries up to 100 feet in length