Jordan Valve Mark 686 User Manual

I & M Mark 686 Series

3170 Wasson Road • Cincinnati, OH 45209 USA

Phone [phone] • Fax [phone]

[e-mail] • www.jordanvalve.com

Warning: Jordan Valve pressure regulators must only be used, installed and repaired in accordance with these In­stallation & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event
of leakage or other malfunction, call a qualifi ed service person; continued operation may cause system failure or a
general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fl uid. 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 main­tained. Spending a few minutes now reading these in­structions 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

Main Steam Line

3

4

1

2

1

1

7

Air Signal

5

1

2

1 Shut off Valve
2 Pipe Union
3 Strainer and Drain Valve
4 Pressure Gauge
5 Jordan Regulator
6 Relief Valve
7 Steam Trap

4

6

R

Preferred Installation

Installation & Maintenance Instructions for

Mark 686 Pressure Regulators (1/4” – 2”)

A line strainer should be installed on the inlet side of 4.
the regulator to protect it from grit, scale and other
foreign matter. A 0.033 perforated screen is usu­ally suitable. Line strainers are available from Jordan
Valve.
Install the regulator in the highest horizontal line of 5.
piping to provide drainage for inlet and outlet piping,
to prevent water hammer and to obtain faster regula­tion.
The fl ow arrow on the regulator body must be 6.
pointed in the direction of fl ow. The regulator may be
installed vertically or horizontally without affecting its
operation.
For best control, 3’0” straight sections of pipe 7.
should be installed on either side of the valve.
In hot vapor lines, upstream and downstream 8.
piping near the regulator should be insulated to
minimize condensation.
If possible, install a relief valve downstream from the 9.
valve. Set at 15 psi above the control point of the
regulator.
Expand the outlet piping at least one pipe size if 10.
the controlled pressure (downstream) is 25% of
the inlet pressure or less. A standard tapered ex­pander connected to the outlet of the regulator is
recommended.
Where surges are severe, a piping accumulator is 11 .
recommended.
Operate the regulator within its rated pressure and 12.
temperature.

To protect the valve from grit, scale, thread chips, 1.
and other foreign matter, all pipe lines and piping
components should be blown out and thoroughly
cleaned before the valve is installed.
Shutoff valves, pressure gauges, and bypass piping 2.
should be installed as indicated in the Ideal Installa­tion Schematic to provide easier adjustment, opera­tion, and testing.
In preparing threaded pipe connections, care 3.
should be exercised to prevent pipe sealing com­pound from getting into the pipe lines. Pipe sealing
compound should be used sparingly, leaving the
two end threads clean. Jordan uses, and recom­mends, thread sealer Tefl on ribbon.

Start-Up

Fully open the outlet shut-off valve.1.
Slowly open the inlet shut-off valve.2.
Slowly open and close outlet shut-off valve several 3.
times. This fully strokes the valve to insure satisfac­tory operation.
With outlet shut-off valve open, slowly increase the 4.
air signal until the desired pressure is shown on the
outlet pressure gauge.
To increase the controlled pressure, increase the 5.
air signal. Note that the air signal will have to be
slightly greater than the desired set point.

Maintenance

Diaphragm Replacement

WARNING: Be sure that there is no pressure in the
valve before loosening any fi ttings or joints. The fol­lowing steps are recommended:

Close the inlet shut-off valve.1.
Allow pressure to bleed off through the down-2.
stream piping. Do not attempt to reverse the fl ow
through the valve by bleeding pressure from the
upstream side of the valve.
When downstream pressure gauge indicates no 3.
pressure in the line, close the outlet shut-off valve.

Refer to the drawing for the proper orientation of the
parts and for proper nomenclature.

Troubleshooting

If You Experience Erratic Control:

Oversizing causes cycling and hunting, and reduces 
the rangeability of the regulator. Make certain that
your sizing is correct.
Steam traps downstream may need attention.
Safety valve may be jammed open, disrupting the 
system. Repair as necessary.
Excessive foreign matter on seat of plug (3,17)*. 
Clean them. Inspect seating surface on plug for
deterioration.
Valve stroke may not be moving freely. Check stem 
(16), bushing (10) or cage bore (2).

If You Experience Downstream Pressure Build-up:

Seats deteriorated. Inspect for foreign material be-
tween plug (3,17) and seat.
Diaphragm (11) failed. Use elastomer seats for tighter 
shut-off.

If You Cannot Maintain Regulated Pressure:

Clogged strainer or lines.
Inlet pressure low.
Air signal too low or signal line is leaking or dam-
aged.
Valve is undersized for rated fl ow.
System demand exceeds pump capacity.

* See back page for parts call-out.

Remove all pressure from the line as outlined un-1.
der WARNING.
Remove the air signal line.2.
Remove the upper diaphragm case (14) by remov-3.
ing hex bolts (15).
Lift the diaphragm assembly. This diaphragm as-4.
sembly consists of the upper diaphragm plate (13),
diaphragm (11) and lower diaphragm plate (12).
Secure the upper diaphragm plate in a vise. Use a 5.
spanner wrench on the lower diaphragm plate and
turn counter-clockwise to loosen and remove.
Remove the diaphragm, clean the parts and install 6.
the new diaphragm in reverse order. Pull the parts
up tight when a metal diaphragm is used. When
elastomer diaphragms are used, clean and de­grease the threads, apply one drop of #290 Loctite
to the threads, and assemble. (Loctite Primer T may
be used to degrease). Thread the parts together,
hand tight, and then tighten 1/8 to 1/4 turn.
Clean the diaphragm seating surfaces on the upper 7.
case (14) and on the body (1).
Unscrew the cage (2) approximately two turns to 8.
retract the stem. Place the diaphragm assembly
back onto the valve body. (Metal diaphragms nest
into the counterbore in the body).
Install upper case. Cross tighten bolts (15) evenly 9.
with a torque wrench as shown in the chart on
page 3.
Thread cage (2) back into the body and pull snug.10.

Seat and Plug Replacement

Remove all pressure from the line as outlined in 1.
the WARNING.
Turn the hex end on the cage (2) counter-clock-2.
wise and remove it from the body. The plug (3,17)
and return spring (5) will come out with the cap.
Remove the seat retaining ring (18), o-ring (20) and 3.
seat (19) from the top side using a retaining ring
tool. Replace seat, o-ring and retaining ring.
Inspect parts for wear and replace as required.4.
Clean all parts in the body and on the cap. Lightly 5.
lubricate these surfaces.
Reassemble plug spring into cap and check for 6.
smooth operation.
Install seat with a light coat of Tefl on paste on the 7.
threads.
Install the cap into the body until it bottoms out 8.
and tighten.

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