Jordan Valve Mark 78 Series – Globe Style Control Valve - Manual

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.jordanvalve.com
I & M Mark 78 Series
Installation & Maintenance Instructions for
Mark 78 Control Valves (1/2” - 1”)
Warning: Jordan Valve Control Valves must only be used, installed and repaired in accordance with these Installa-
tion & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event
of leakage or other malfunction, call a qualified service person; continued operation may cause system failure or a
general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fluid. Before disassembling
a valve, be sure to release all spring tension.
Please read these instructions carefully!
Your Jordan Valve product will provide you with long, trou-
ble-free service if it is correctly installed and maintained.
Spending a few minutes now reading these instructions
can save hours of trouble and downtime later. When mak-
ing repairs, use only genuine Jordan Valve parts, available
for immediate shipment from the factory.
Ideal Installation
1. To protect the valve from grit, scale, thread chips, and
other foreign matter, all pipe lines and piping compo-
nents should be blown out and thoroughly cleaned
before the valve is installed.
2. Shutoff valves, pressure gauges, and bypass piping
should be installed as indicated in the diagram to pro-
vide easier adjustment, operation, and testing.
3. In preparing threaded pipe connections, care should
be exercised to prevent pipe sealing compound
from getting into the pipe lines. Pipe sealing com-
pound should be used sparingly, leaving the two lead
threads clean.
4. A line strainer should be installed on the inlet side of
the regulator to protect it from grit, scale and other
foreign matter. A 0.033 perforated screen is usually
suitable. Line strainers are available for immediate
shipment from Jordan Valve.
5. Install the valve in the highest horizontal line of pip-
ing to provide drainage for inlet and outlet piping, to
prevent water hammer and to obtain faster response.
6. The flow arrow on the regulator body must be pointed
in the direction of flow. The valve may be installed ver-
tically or horizontally without affecting its operation.
7. For best control, 3’ 0” straight sections of pipe should
be installed on either side of the valve.
8. In hot vapor lines, upstream and downstream piping
near the valve should be insulated to minimize con-
densation.
9. If possible, install a relief valve downstream from the
valve. Set at 15 psi above the control point of the valve.
10. Expand the outlet piping at least one pipe size if the
controlled pressure (downstream) is 25% of the inlet
pressure or less. A standard tapered expander con-
nected to the outlet of the valve is recommended.
11. Where surges are severe, a piping accumulator is rec-
ommended.
Start-Up
1. Be sure that the action of the control valve and the
controller are such as to give the desired results. See
“Reversing Action” to change the valve action if nec-
essary.
If an increase
in pressure or
temperature must:
And the
action of the
valve is:
Then the action
of the controller
must be:
Close Valve Air to Close Direct
Close Valve Air to Open Reverse
Open Valve Air to Close Reverse
Open Valve Air to Open Direct
2. The control valve has been pre-set by Jordan Valve.
However, finer adjustments may be required to com-
pensate for pressure drop conditions of the applica-
tion.
3. With the inlet, outlet and bypass shutoff valves closed,
and no pressure in the downstream line, fully open the
shutoff valve. Slowly open the inlet valve just enough
Main Line
Control Valve
1. Shut off Valve
2. Pipe Union
3. Strainer and Drain Valve
4. Pressure Gauge
5. Control Valve
6. Relief Valve
Condensate Return
3
Bypass Line
1
1
6
R
4
1
2
5
2
1
4