I & M Mark 50/51 (1/4” - 2”)

I & M Mark 50/51 (1/4” - 2”)
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.jordanvalve.com
Installation & Maintenance Instructions for
Mark 50/51 (1/4” - 2”) Back Pressure Regulators
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 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, troublefree 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.
Installation Schematic
Main Line
4
5
1
3
1
1
2.
3.
4.
5.
2
2
6
1. Shutoff Valve
2. Pipe Union
3. Strainer & Drain Valve
1.
1
4. Pressure Gauge
5. Back Pressure Regulator
6. Steam Trap
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.
Shutoff valves, pressure gauges, and by-pass piping
should be installed as indicated in the Ideal Installation
Schematic to provide easier adjustment, operation and
testing.
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.
For best control, 3’ 0” straight sections of pipe should
be installed on either side of the valve.
In preparing threaded pipe connections, care should
be exercised to prevent pipe-sealing compound from
getting into pipelines. Pipe sealing compound should
be used sparingly, leaving the two end threads clean.
Jordan uses, and recommends, thread sealer Teflon
ribbon.
6.
The flow arrow on the valve body must be pointed in
the direction of the flow. Ideally 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.
7.
If possible, install a relief valve upstream from the valve.
Set at 15 PSI above the control point of the valve.
8.
In hot vapor lines, upstream and downstream piping
near the valve should be insulated to minimize condensation.
9.
In gas service, if the downstream pressure is 25% 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.
10. Where surges are severe, a piping accumulator is recommended.
11. 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.
Start-Up
With the inlet and outlet shut off valves closed:
1.
2.
3.
4.
5.
6.
Throttle the bypass shutoff valve so that the pressure to
be controlled is maintained near the set point.
Open the outlet shutoff valve.
Slowly open the inlet shutoff valve.
Slowly close the bypass shutoff valve, but do not close
it fully until you are certain that the regulator has control of the system.
To change the controlled pressure, turn the adjusting
screw clockwise to increase the pressure, counterclockwise to decrease pressure.
Body and cap bolts should be retightened per torque
procedures after valve reaches operating temperature.
Trouble Shooting
If You Experience Erratic Control:

Over sizing causes cycling and hunting and reduces
the rangeability of the valve. Make certain that the siz-
Click here to view the Repair and Maintenance video for the Mark 50/51Series or visit jordanvalve.com/support/videos.






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 important.
ing is correct.
Steam traps may need attention.
Safety valve may be jammed open. Repair as necessary.
Excessive foreign matter on seats. Clean the seats.
Valve stroke out of adjustment. Check and readjust as
necessary.
Valve disc may not be moving freely. Check disc guide
clearance, and clearance of the stem to the bushings.
Surges in the system. Check the accumulator.
1.
2.
If Valve Will Not Operate:

Diaphragm ruptured. Replace the diaphragm.

Improper spring setting. Reset the valve.
3.
Maintenance
4.
Caution: Ensure that the valve is de-pressurized before
loosening any fittings or joints. The following steps are
recommended before performing any maintenance on
the valve:
1.
2.
3.
4.
It is imperative that the disc pin assembly (disc pin,
stem and locknut is not rotated when disassembling, cleaning or reassembling, since this will affect the stroke adjustment of the valves.
Close the inlet shutoff valve.
Turn the adjusting screw fully clockwise.
Allow pressure to bleed off through the downstream
piping. Do not attempt to reverse the flow through
the valve by bleeding pressure to the upstream side
of the valve.
When the pressure gauges indicate that all pressure
has been removed from the system, close the outlet
shutoff valve and turn the adjusting screw counterclockwise. The valve may be removed from the line
and serviced.
5.
6.
Note: Refer to the drawing at the end of this document for
description and proper orientation of parts.
Click here to view the Repair and Maintenance video for
the Mark 50/51 Series or visit jordanvalve.com/support/
videos.
Disc Pin
Index Pin
Body Bolts
Stud Nuts (2)
Reassembly
1.
Place the disc guide in the body, the index-pin hole
should be on the same side of the body as the “<” on
the body.
Place the disc in the aperture of the disc guide with the
arrow pointing to the index pin hole and engage the
disc pin. Insert the index pin into the index pin hole.
Place the plate in the valve body making sure to engage
the index pin. Rotate the assembly slightly until the slot
openings in the disc are parallel to the openings in the
plate and perpendicular to the stem. Stroking the valve
will aide in this alignment.
Align the “>” on the cap with the “<” on the body, and
place the cap over the two studs in the body.
Install the nuts and cap bolts. Tighten uniformly. See
section on “Torque Procedures”.
3.
Disc
Plate
4.
Cap
Clean all of the parts, body and cap with solvent. Place
a piece of 4/0 polishing cloth or jewelers cloth on a
smooth, flat surface, and polish the lapped seating surfaces of the disc, plate, and disc guide 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. Often parts can be repaired at a minimal
cost if the parts are not scarred too deeply.
The vertical sections of the disc guide serve as guides
for the disc while stroking. A 0.005 feeler gauge should
be used to check for clearance between this surface
and the side of the disc. If the clearance is less, clean
the guide surfaces in the disc guide with a fine file.
B.
2.
Body
Studs (2)
Disc Guide
5.
Valve Seats
A.
Follow the Maintenance procedures to remove the
valve from line.
Note the scribed arrow (<) on the side of the body and
cap. Secure the body flats in a vise. Remove the cap
bolts and two nuts from the studs. Lift the cap straight
up.
Next remove the plate and place it on the bench lapped
surface up. You will notice that there is an index pin,
which aligns the plate with the disc guide. The scribe
on the out side of the body and cap indicates the side
the index pin should be on.
Now remove the disc and disc guide, placing the disc
on the bench with the lapped surface up. Finger tip
pressure should be sufficient to remove these parts.
Diaphragm Replacement
Disassembly
A.
Jordan Valve Sliding Gate Seats are lapped to
light band flatness. Maintaining such tolerances is
-2-
Disassembly
1.
2.
3.
4.
5.
6.
In removing the diaphragm, you must first remove the
disc and plate. This is outlined in the section “VALVE
SEATS”.
Remove all of the compression from the spring by
rotating the adjusting screw counterclockwise until it
moves freely. (Failure to remove the pressure from the
spring could result in personal injury or damage to the
valve.)
Remove the spring housing bolts and spring housing.
Remove the spring, and spring seat.
Hold the disc pin with an open-end wrench and remove
the diaphragm assembly by rotating counterclockwise.
The diaphragm assembly consists of the upper diaphragm plate, diaphragm, and lower diaphragm plate.
If the diaphragm must be replaced, secure the upper diaphragm plate in a vise. A face spanner wrench
should be used to remove the lower diaphragm plate
from the assembly. If a face spanner is not available,
use a punch and hammer, but make certain to remove
all burrs prior to reassembling.
Remove the diaphragm and reassemble in reverse order.
6.
7.
8.
9.
Disc Pin & Stem Replacement
B.
Assembly and Stroke Adjustment
1.
1.
In assembly, note that the valve stroke adjustment is
determined by how far the diaphragm assembly is
screwed onto the stem. Holding the disc pin with an
open-end wrench, screw the diaphragm assembly
onto the stem until the disc pin is centered in the valve
body.
Place the disc guide, disc, and the plate in the valve
body using the same precautions as outlined under
“VALVE SEATS”.
Secure the spring housing to the body with two bolts
180° apart.
2.
2.
3.
raise the disc.
A further check of the stroke adjustment can be made
by checking the orifices in the closed position. This is
a normally closed valve, and there should be a 1/32”
overlap when the diaphragm assembly is down against
the body. When seats are in perfect alignment proceed
with the assembly of the spring housing. Remove the
valve plate and disc to eliminate the possibility of damage during the top works reassembly.
If the diaphragm is metal, be sure that the diaphragm is
aligned in the body recess. This recess also aligns the
spring housing. Be sure that the bleed hole is facing
up stream.
If the diaphragm is elastomer, make sure that after the
seats are in perfect alignment that the bolt holes are
in alignment. If an adjustment needs to be made to
align the bolt hole, make the adjustment by turning the
diaphragm assembly clockwise.
Install and tighten the spring housing bolts per the
torque instructions on the back page.
3.
4.
5.
6.
Remove the disc and plate, following the procedure
outlined under VALVE SEATS.
Remove the diaphragm as outlined under DIAPHRAGM
REPLACEMENT.
Holding the disc pin assembly with an open-end
wrench, loosen the locknut. The stem can now be unscrewed from the disc pin and the locknut removed
from the stem.
Remove the stem upward through the diaphragm area
and the disc pin through the body orifice.
Check the condition and clean all parts. Clean the
lower guide hole in the valve body and replace any
defective parts.
Reassemble in reverse order and follow the procedures outlined under DIAPHRAGM REPLACEMENT and
VALVE SEATS for proper adjustment. When reassembling, thread the stem fully into the disc pin and then
tighten the locknut.
Ordering Spare Parts
Use only genuine Jordan Valve parts to keep your valve in
good working order. So that we can supply the parts, which
were designed for your valve, we must know exactly which
product you are using. The only guarantee to getting the correct replacement parts is to provide your Jordan Representative with the valve serial number. This number is located on
the valve identification tag.
4.
5.
If the serial number is not available, the parts needed for your
valve might be determined using the following information:
Model Number, Valve Body Size, Seat Material and CV rating,
Spring Range and Set Point, Trim Material, Part Name – Number and Quantity.
Using a small screwdriver through the upstream opening of the valve, stroke the valve against the upper travel stop of the spring housing. The orifices should be
aligned and in the full open position.
If the orifices are not in perfect alignment, remove the
spring housing and rotate the diaphragm assembly
counterclockwise to lower the disc and clockwise to
NOTE: Without a valve serial number, any parts ordered
incorrectly are subject to a minimum 25% restock charge
when returned.
-3-
Illustration and Parts List
3A
4A
1A
1S
2S
2A
1V
10V
11V
2V
12V
9V
8V
Item
Description
1A
Spring Housing
2A
Spring Housing Bolt
3A
Adjusting Screw
4A
Locknut
1S
Spring Seat
2S
Spring
1V
Body
2V
Cap
*3V
Plate
*4V
Disc
*5V
Disc Guide
*7V
Disc Pin
*8V
Stem Locknut
*9V
Stem
*10V
Diaphragm
11V
Lower Diaphragm Plate
12V
Upper Diaphragm Plate
13V
Body Bolt
*
Recommended Spare Parts
7V
3V
13V
4V
5V
Torque Values
Connection
Body to Cap
Body to Spring
Housing
Valve Size
BRZ Body
DI, CS or SS Body
½” & ¾”
140 in.-lbs.
200 in.-lbs.
1” & 1¼”
140 in.-lbs.
200 in.-lbs.
1½” & 2”
140 in.-lbs.
200 in.-lbs.
½” - 2”
200 in.-lbs.
200 in.-lbs.
Bolt Pattern / Torque Sequence
5
2
4
3
1
6
6 bolts
(or multiples)
Bulletin IM-MK50/51sm-0316
7
2
6
3
4
5
1
8
8 bolts
(or multiples)
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.jordanvalve.com