Jordan Valve Mark 76 User Manual
I & M Mark 76
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
info@richardsind.com • www.jordanvalve.com
Installation & Maintenance Instructions for
Mark 76 On-Off Control Valves (1/4” - 2”)
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 qualied service person; continued operation may cause system failure or a
general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized uid. Before disassembling
a valve, be sure to release all spring tension.
Please read these instructions carefully!
Blow out pipe lines and strainers thoroughly before 1.
installation to protect the valve from grit, scale and
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.
foreign matter. On new installations, be sure that
all thread chips are removed before inserting Mark
76.
Flow arrow on valve body must be pointed in the 2.
direction of ow. The valve may be installed verti-
cally or horizontally without affecting its operation.
Pipe sealing compound should be used sparingly, 3.
Jordan’s Mark 76 control valve provides straight-through
ow and Class IV shutoff for ON-OFF service. The short
stroke required to completely open or close the sliding
gate seats provides rapid response to an air signal and
prevents undue stress on the diaphragm. The wearresistant elastomer diaphragm has been subjected to
rigorous tests of over ten million complete cycles with no
indication of excessive wear.
leaving the two lead threads clean. Do not use red
lead or cement for making up the joints.
Shutoff valves should be installed on the inlet and 4.
outlet side of each Mark 76 installed.
Strainers should be installed upstream of all valves 5.
to protect them from excessive dirt and scale in
pipelines (0.033 perforated screens are usually
suitable).
Packing is of the spring-loaded chevron Teon type to
provide long, leak-resistant service. Although the Mark
76 ON-OFF valves are economically priced, the stainless
steel seats and other internal parts are the same high
quality materials and construction used in Jordan Valve’s
Mark 70 control valves, and are completely interchangeable with their internal parts.
Ideal Installation
Main Line
4
3
1
1. Shutoff Valve 4. Pressure Gauge
2. Pipe Union 5. MK76 On-Off Control Valve
3. Strainer & Drain Valve 6. Steam Trap
1
Condensate Return
6
(on steam service)
5
By-Pass
Control Air
1
22
Operation
The valve seats are normally open (or closed) until sufcient air is fed to the top of the diaphragm to overcome
the spring and close (or open) the seats. The pressure
required to operate the valve will vary according to the
pressure drop through the valve. The valve signal can be
received from a solenoid valve, a controller, or from any
other normal control source.
Trouble Shooting
If You Experience Erratic Operation:
Ruptured diaphragm: replace.
Excessive foreign matter may have lodged in the
seats: clean and replace.
Valve stroke may be out of adjustment: follow
maintenance procedures on inside pages.
Valve disc may not be moving freely in the disc
guides: follow procedures under Valve Seats on
inside pages.
Insufcient air loading pressure: increase air pres-
sure.
Valve Seats
The valve seats in all Jordan valves are lapped to
a critical atness. Maintaining such tolerances is
of paramount importance for your assurance of
excellent control and tight shut-off. Do not use
metallic objects in removing the seats. Care in
handling is imperative.
Note: Reference schematic on back page for positioning and names of parts.
A. DISASSEMBLY
Close shutoff valve on each side of the control 1.
valve.
Remove the control valve from the line.2.
Note the indicator markings on the side of the valve 3.
body and cap. Secure the outlet body hex in a vise.
Remove the cap screws and lift the cap straight up.
Before removing, check the valve disc for a 4.
stamped arrow. This arrow points to the indicator markings on the body and cap and the index
pin hole in the valve plate. Since the disc can be
rotated 180° in some sizes without affecting the
stroke adjustment, there may be no arrow on the
valve disc. Remove the valve disc and place it on a
bench with the lapped surface up.
A light tapping on the valve body is normally suf-5.
cient to loosen the disc guide and plate. Invert the
valve body while holding the disc guide and plate
in place; then slowly let them drop out of the body
into your hand.
Improper handling of the seats will result in leakage or improper control upon installation.
than 0.005, clean the sides of the disc guides with
a ne le.
B. REASSEMBLY
Place the valve plate in the body seat recess. In 1.
replacing, make certain that the index pin hole is
on the same side as the indicator markings on the
valve body. Align the disc pin so that it is centered
in the body bore and protrudes through the center
slot of the valve plate.
Place the valve disc with the stamped arrow point-2.
ing to the indicator markings on the valve body on
the valve plate, engaging the disc pin into the hole
of the valve disc.
Install the disc guide, engaging the index pin.3.
In replacing the valve cap, note that the indicator 4.
markings on the valve cap and body must be in
alignment.
Install the cap screws and tighten uniformly, diago-5.
nally from each other. See back page for torque
requirements.
Stroke Adjustment
Rotate the disc pin on the stem until the disc pin is 1.
located near the upper end of the disc pin slot in
the plate.
If the action of the valve is “air-to-close” (direct act-2.
ing), the orices in the valve disc and plate should
be aligned and the valve should be in the full open
position. If the action of the valve is “air-to-open”
(reverse acting), apply an air signal to the actuator.
The disc should stroke down to a fully open posi-
tion and the orices in the disc and plate should be
in alignment.
It is imperative that the disc pin is not rotated in disassembly, cleaning, or reassembly, since this affects
the stroke adjustment of the valve.
Clean all parts of the body and cap with solvent. 6.
The valve disc and plate then may be cleaned.
Place a piece of 4/0 polishing paper or jewelers
cloth on a smooth, at surface and polish the components using a gure-eight motion. If the parts are
scarred, do not attempt to re-lap them, but return
to the factory for repair or replacement. If the seats
are not scarred deeply, they can be repaired many
times at nominal cost.
The vertical milled sections of the disc guide serve 7.
as a guide for the disc while stroking. A 0.005
feeler gauge should be used to check the clearance between the sides of the valve disc and the
disc guides. To do so, place the valve disc in the
disc guide with the lapped surface facing upward
and check this clearance. If the clearance is less
CAUTION: the air signal should be applied to the actuator, and the valve fully stroked before placing the disc
and plate in the valve body.
If minor adjustment is required to align the orices, 3.
remove the disc and plate from the valve body and
proceed with step 4.
Loosen disc locknut and rotate the disc pin in the 4.
desired direction to raise or lower it, and re-tighten
the locknut.
Remove the spring compression from the dia-5.
phragm plate by inserting a screwdriver between
the upper coils of the spring, compressing it down-
ward.
The stem and disc can then be rotated to center 6.
the disc pin in the disc pin slot in the plate.
Replace the valve seats and the cap as outlined in 7.
“Valve Seats” instructions on previous page.
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