Jordan Valve Mark 75 User Manual

I & M Mark 75 (1” – 2”)

3170 Wasson Road • Cincinnati, OH 45209 USA

Phone [phone] • Fax [phone]

[e-mail] • www.jordanvalve.com

Installation & Maintenance Instructions for

Mark 75 Wafer Control Valve

Warning: Jordan Valve Control Valves 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 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!

should be installed on either side of the valve.

5. The disc in the valve body must be positioned

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.

in the upstream portion of the flow, and the set­screws should be on the downstream side of the
valve. Ideally for steam applications, the valve
should be installed in the highest horizontal line of
piping to provide drainage for inlet and outlet pip­ing, to prevent water hammer, and to obtain faster
response.

6. If possible, install a relief valve downstream from

Ideal Installation

the valve. Set at 15 psi above the control point of
the valve.

Main Line

7. In hot vapor lines, upstream and downstream pip­ing near the valve should be insulated to minimize

Control Air

condensation.

8. In gas service, expand the outlet piping at least

3

4

7

1

7

2

1

4

5

R

one pipe size, if the control pressure (downstream)
is 25 percent of the inlet pressure or less. A stan­dard tapered expander connected to the outlet of
the valve is recommended.

9. Where surges are severe, a piping accumulator is
recommended.

1

1

6

Condensate Return Line

1. Shut off Valve

2. Jordan Control Valve

3. Strainer and Drain Valve

4. Pressure Gauge

5. Relief Valve

6. Steam Trap

7. Pipe Union

10. On steam control applications, install a steam trap
with sufficient capacity to drain the coil or condens­er. 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.

11. Tighten pipe flange bolts just enough to effect a
good seal.

1. To protect the valve from grit, scale, thread chips
and other foreign matter, ALL pipelines and piping
components should be blown out and thoroughly
cleaned before the installation process begins.

2. Shutoff valves, pressure gauges and by-pass pip­ing should be installed as indicated in the diagram
above to provide easier adjustment, operation, and
testing.

3. A line strainer should be installed on the inlet side
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 avail­able from Jordan Valve.

4. For best control, 3’ 0” straight sections of pipe

PROTECT VALVES WITH LINE STRAINERS

Start-Up Procedure

1. Be sure that the action of the control valve and of
the controller are such that you achieve the desired
results.

Increase in

pressure or

temperature must:

Close Valve Air to Close (Direct) Direct

Close Valve Air to Open (Reverse) Reverse

Close Valve Air to Close (Direct) Reverse

Close Valve Air to Open (Reverse) Direct

And the action of

the valve is:

Then the action
of the controller

must be:

2. The control valve has been pre-set by Jordan Valve,
however, finer adjustment may be required to com­pensate for the system conditions of your applica­tion.

3. With inlet, outlet and bypass shutoff valves closed,
and no pressure in the downstream line, gradually
open the inlet valve enough to start flow through
the control valve. Increase the flow gradually by
slowly opening the inlet shutoff valve. Do not fully
open the inlet valve until you are sure that the
controller and control valve have control of the
system. Usually, the handwheel on the inlet valve
will turn freely when this point is reached.

4. To shut off the line fluid, close the inlet shutoff
valve first, and then close the outlet shutoff valve.

5. Loosen the body set screws (42).

6. It may be necessary to re-torque the pipe flange
bolts.

Maintenance

Caution: Make certain that there is no pressure in the
valve before loosening any fittings or joints. The fol­lowing steps are recommended:

1. Close the inlet shutoff valve.

2. Allow pressure to bleed off through the down­stream piping. Do not attempt to reverse the flow
through the valve by bleeding pressure from the
upstream side of the valve.

3. When the pressure gauges indicate that all pres­sure has been removed from the system, close the
outlet shutoff valve and the valve may be serviced.

Note: refer to the drawing at the end of this document
for description and proper orientation of parts.

Valve Seats

(28), Disc (27), and Gasket (36). Place the plate on
the bench with the lapped surface up.

5. Clean all parts of the Body (1) with a good quality
solvent. Remove Guide screws (35) and Guides
(34), the Disc (27) and Plate (28) can then be
cleaned. Place a piece of 4/0 polishing cloth or
jeweler’s cloth on a smooth flat surface such as a
surface plate and polish the Disc, and Plate lapped
surfaces using a figure “8” motion. If the parts are
scarred, do not attempt to re-lap them, but return
them to the factory for repair or replacement.

B. Reassembly

1. Place the plate (28) on a clean, flat work surface
with the lapped side up. The small single locator
hole should be towards you.

2. If the valve action is “air to open”, place the Disc
(27) on the Plate with the words “TOP REVERSE”
away from you. If the valve action is “air to close”,
the words “TOP DIRECT” should be away from you.
Move the Disc (27) until the slots are in perfect
alignment with those of the plate (28).

3. Place the Guides (34) on either side of the Disc
(27), and secure them with the Guide screws (35)
so that the Disc (27) can move freely up and down
but not side to side.

4. Lightly lubricate both side of the Body Gasket (36)
with an anti-seize compound. Place a new Body
Gasket (36) into the Body (1).

5. Hold the Plate / Disc assembly together and insert
it into the large end of the Body (1) with the slots
perpendicular to the stem (20), taking care that the
“T” slot in the Disc (27) engages the head of the
valve stem. The word ”TOP” should be towards the

actuator.

6. Replace the Set screws (42) in the Body (1).

7. Follow instructions under Installation & Start Up
Procedure when placing valve back in service.

A. Disassembly

The sliding Gate Seats of Jordan Valves are lapped to
light band flatness. Maintaining such tolerances is of
paramount importance for your assurance of excellent
control and tight shutoff. DO NOT use metallic objects
in removing the seats. Care in handling is imperative.

1. Tighten the body set screws (42). Follow instruc­tions under the Maintenance section to remove
valve from line.

2. Disassemble the valve only as far as necessary to
do the required work.

3. When replacing seats it is recommended by Jordan
Valve that the packing be replaced if the valve is
older than one year. Follow the instructions under
Packing Replacement.

4. Remove the Set screws (42), and remove the Plate

Stem & Packing Replacement

1. Remove the Plate (28) and Disc (27), following the
procedure outlined under the Valve Seats section.

2. Loosen the Stem Connector Nut (31) and Bolt (30)
and remove Connector Halves.

3. Back out the Yoke SST Screws (29) and allow the
Body (1) to separate from the Yoke (3).

4. Remove the Packing Flange Nuts (43) and the
Packing Flange (24).

5. Before pulling the Stem (20) completely out of the
Body, you must remove the “7th” Stem T-Head (32)
by unscrewing it from the Stem (20). Remove the
Packing Assembly (37,38, & 40). The remaining
parts of the Packing Assembly can “fished” out with
a small screwdriver. (Be careful not to damage the

packing bore.)

6. Clean the packing bore in the Body with solvent

-2-

and blow dry.