Jordan Valve Mark 80 Series – Self Operated Temperature Regulator - Manual (Page 7)

OPERATION OF THERMAL SYSTEM
The LIQUID-VAPOR thermal system used on all Jordan tem-
perature regulators is capable of delivering far more operat-
ing power than the simple liquid expansion system used on
many competitive valves.
A pre-measured amount of volatile 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 in the sealed
system. This pressure, exerted on the diaphragm, drives the
valve stem which closes direct acting valve seats or opens
reverse acting valve seats.
SENSING BULB
The sensing bulb contains the volatile liquid fill. Standard
sensing bulbs are copper and stainless steel. Other ma-
terials are available on special order. Special protective
coatings such as Plastisol, or Teflon are also available on
special order. The type B bulb is always used when a spe-
cial protective coating is required. Special bulbs may, in
some cases, be made to fit existing equipment; however,
the dimensions change sharply and must be confirmed by
Jordan’s Engineering Department.
DIAPHRAGM & DIAPHRAGM HOUSING
Many Jordan temperature regulators feature the SWA actua-
tor. The diaphragm housing is composed on two formed
stainless steel plates. A stainless steel diaphragm is placed
between the two plates and the three parts are heliarc
welded to assure a vapor-tight assembly.
Other Jordan Regulators have cast iron diaphragm housing
plates with a diaphragm bolted between them.
CAPILLARY & ARMOR
The capillary, connecting the sensing bulb to the diaphragm
housing is copper as standard, or stainless steel as an alter-
nate. Standard length is 8’ 0” but other lengths, even up to
100’ 0”, are available on special order.
A flexible stainless steel armor is used to protect the copper
capillary tube on standard thermal systems. Other materials
such as Plastisol, Polypropylene, and Teflon are available on
special order.
FILL
The type of volatile liquid used in Jordan thermal systems
depends upon the desired temperature range. Jordan engi-
neers have carefully selected liquid fills that can be used for
controlling temperature from -20°F to 450°F.
INVERTED MOUNTING
The capillary tube extends to the end of the sensing bulb
and is bent so that it will always be in the volatile liquid fill.
(Fig’s 2 & 4) The word TOP is stamped on the bulb fitting so
the installer can mount it properly.
If the sensing bulb is to be mounted in an inverted position
(Fig. 3) the capillary is shortened so that its tip will remain
immersed in the liquid fill.
TANK FITTING
Tank fittings are furnished with thermal system types A, D,
E and F unless a thermowell is purchased with the valve.
The external threads on the fitting are 1” NPT; the internal
threads, matching the bulb nut threads, are 1-1/4” - 18
UNEF-2B. Also available are tank fittings having 3/4” NPT
external threads.
Thermal System
Capillary
Fill
Armor
Diaphragm
Vapor Capillary
Liquid
The word
TOP is
stamped
here
Vapor
V
apor
Liquid
Liquid
Figure 4
Tank Fitting
Figure 2
Figure 3