Jordan Valve Mark 70 Series – Sliding Gate 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 70
Installation & Maintenance Instructions for
Mark 70 Control Valve with Multispring Actuator
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,
trouble-free service if it is correctly installed and main-
tained. Spending a few minutes now reading these in-
structions can save hours of trouble and downtime later.
When making repairs, use only genuine Jordan Valve
parts, available for immediate shipment from the factory.
Ideal Installation
To protect the valve from grit, scale, thread chips 1.
and other foreign matter, ALL pipelines and piping
components should be blown out and thoroughly
cleaned before the installation process begins.
Shutoff valves, pressure gauges and by-pass pip-
2.
ing should be installed as indicated in the diagram
above to provide easier adjustment, operation, and
testing.
A line strainer should be installed on the inlet side
3.
of the valve to protect it from grit, scale and other
foreign matter. A 0.033 perforated screen is usually
suitable for this purpose. Line strainers are avail-
able from Jordan Valve.
For best control, 3’ 0” straight sections of pipe
4.
should be installed on either side of the valve.
In preparing threaded pipe connections, care 5.
should be exercised to prevent pipe-sealing com-
pound from getting into the pipelines. Pipe-sealing
compound should be used sparingly, leaving the
two end threads clean. Jordan uses, and recom-
mends, thread sealer Teflon ribbon.
The flow arrow on the valve body must be pointed
6.
in the direction of flow. Ideally, the valve should be
installed in the highest horizontal line of piping to
provide drainage for inlet and outlet piping, to pre-
vent water hammer, and to obtain faster response.
If possible, install a relief valve downstream from
7.
the valve. Set at 15 psi above the control point of
the valve.
In hot vapor lines, upstream and downstream pip-
8.
ing near the valve should be insulated to minimize
condensation.
In gas service, if the control pressure (downstream)
9.
is 25 percent of the inlet pressure or less, expand
the outlet piping at least one pipe size. A standard
tapered expander connected to the outlet of the
valve is recommended.
Where surges are severe, a piping accumulator is
10.
recommended.
On steam control applications, install a steam trap
11.
with sufficient capacity to drain the coil or condens-
er. Be sure to have a good fall to the trap, and no
backpressure. Best control is maintained if the coil
or condenser is kept dry.
Trouble Shooting
Erratic Control
Oversizing causes cycling and hunting and reduces 
the rangeability of the valve. Make certain that your
sizing is correct.
Steam traps downstream may need attention.

Excessive foreign matter on seats. Clean them. 
Valve stroke out of adjustment. Check and readjust 
if necessary.
Valve disc may not be moving freely.

Will Not Operate
Diaphragm ruptured. Replace. 
Range springs broken. Replace. 
Improper spring setting. Reset. 
Main Line
Condensate Return Line
1. Shut off Valve
2. Pipe Union
3. Strainer and Drain Valve
4. Pressure Gauge
5. Jordan Mark 70 DCV
6. Relief Valve
Central Air
By-Pass Line
4
1
1
2
R
6
4
1
2
5
1
3
Steam Trap
PROTECT VALVES WITH LINE STRAINERS