Page 1
I & M Mark 708
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowowvalve.com
Installation & Maintenance Instructions for
Mark 708 & 14M Actuator and Motor Valve
Warning: Jordan LowFlow 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!
For best control, 3’ 0” straight sections of pipe 5.
should be installed on either side of the valve.
Your Jordan LowFlow 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
LowFlow Valve parts, available for immediate shipment
from the factory.
In preparing threaded pipe connections, care 6.
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 Teon ribbon.
The ow arrow on the valve body must be pointed 7.
in the direction of the ow. Ideally the valve should
Ideal Installation
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.
If possible, install a relief valve downstream from 8.
the valve. Set at 15 psi above the control point of
3
4
1
1
5
2
1
2
4
6
R
the valve.
In hot vapor lines, upstream and downstream pip-9.
ing near the valve should be insulated to minimize
condensation.
Evaluate inlet and outlet pipe friction losses and ve-10.
locities to decide when smaller outlet piping might
1
1. Shut off Valve
2. Pipe Union
3. Strainer and Drain Valve
4. Pressure Gauge
5. Mark 708DCV
6. Relief Valve
cause excessive back pressure. When required, a
standard tapered expander connected to the outlet
of the valve is recommended.
Where surges are severe, a piping accumulator is 11.
recommended.
On steam control applications, install a steam trap 12.
with sufcient capacity to drain the coil or condens-
To control very low ow rates, Mark 708 control 1.
valves are often provided with trims having very
small clearances. To keep this trim functioning
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.
properly, it is essential that the uid owing through
the valve be clean.
Start-Up Procedure
To protect the valve from grit, scale, thread chips 2.
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 3.
Be sure that the action of the control valve and of 1.
the controller are such that you achieve the desired
results. The action can be changed if needed using the instructions shown in “Reversing Action”.
should be installed as indicated in the Installation
Schematic to provide easier adjustment, operation
and testing.
A line strainer should be installed on the inlet side 4.
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.
Increase in pressure
or temperature must:
Close Valve Air to Close (direct) Direct
Close Valve Air to Open (reverse) Reverse
Open Valve Air to Close (direct) Reverse
Open Valve Air to Open (reverse) Direct
And the action of
the valve is:
Then the action of the
controller must be:
Page 2
The control valve has been pre-set by Jordan Valve, 2.
however, ner adjustment may be required to compensate for the system conditions of your application.
With inlet, outlet and bypass shutoff valves closed, 3.
and no pressure in the down stream line, fully
open the outlet valve. Slowly open the inlet valve
just enough to start ow through the control valve.
Increase the ow 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.
To shut off the line uid, close the inlet shutoff 4.
valve rst, and then close the outlet shutoff valve.
Maintenance
Caution: Make certain that there in no pressure in the
valve before loosening any ttings or joints. The following steps are recommended:
Close the inlet shutoff valve.1.
Allow pressure to bleed off through the down-2.
stream piping. Do not attempt to reverse the ow
through the valve by bleeding pressure from the
upstream side of the valve.
When the pressure gauges indicate that all pres-3.
sure 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.
To reduce maintenance time, refer to proper gure and
follow steps indicated below for applicable maintenance
operation.
Proposed Maintenance
Procedure
Renewing Stem Packing Packing Replacement
Valve Disassembly,
Inspecting Parts, Replacing
Plug or Seat Ring
Valve Reassembly Valve Reassembly
Actuator Spring Preload
Adjustment
Actuator Maintenance Actuator Maintenance
Motor Valve Seat Spring
Preload
Packing Replacement
Renew valve plug stem packing if control valve has been
in service beyond normal maintenance, and packing
shows signs of wear. Wear will be indicated by leakage,
which cannot be corrected by minor tightening of the
packing ange. An additional packing ring can be installed to overcome minor leakage without dismantling
the control valve or breaking valve plug connection.
Follow Steps...
Valve Disassembly
Actuator Spring Load
Adjustment
Motor Valve Seat Spring
Preload
Remove the actuator from the bonnet. (See Remov-1.
ing Actuator from Valve.)
Remove all of the packing and discard. Clean valve 2.
stem and packing box thoroughly. The valve stem
may be dressed with a very ne crocus cloth, but
generally it is best not to as the stem has a ne machined nish. Use approved non-residue-forming
solvent for cleaning. Wipe dry with clean cloth.
Insert a new set of packing in packing box. Press 3.
each ring down in place with a tube as it is installed.
After packing is installed, assemble packing adapt-4.
er, gland, and gland nuts. Tighten the nuts hand
tight.
The nal packing adjustment should be made with 5.
the valve pressurized and the packing tightened
just enough to stop any leakage, while stroking the
valve. Excessive tightening could cause the stem
to stick and result in improper valve operation
due to high friction forces.
Removing Actuator from Valve
1a. Direct Acting Actuator (ATC): Shut off pressure to
the actuator and remove supply tubing from the
actuator case.
1b. Reverse Acting Actuator (ATO): Apply approxi-
mately 6 psig air pressure to the actuator to lift the
plug off of the seat.
1c. Motor Valve (Mark 708MV): Position the valve to full
open and disconnect all electrical connections.
2. Remove the actuator from the valve as follows:
loosen the two stem connector nuts and move
them down the stem. Lock these nuts together.
Remove the two nuts that secure the packing
ange, then the then the two hex bolts that secure
the yoke to the bonnet. Remove the gland nuts (11)
that secure the packing gland (9) and the packing
adaptor (7). Using a wrench on the nuts and on
the ats of the actuator stem, turn the stem connector (while holding the actuator stem in place)
until the stems disengage. The actuator will be free
of the valve.
Body & Bonnet Disassembly
For actuator removal, refer to section on “Removing 1.
Actuator”.
Remove the body/bonnet bolts and 2. carefully sepa-
rate the body from the bonnet so as not to damage
delicate trim components.
Remove stem nuts and indicator. Withdraw the 3.
stem and plug out of the bonnet. (The smaller trims
have a one-piece stem and plug, which can be
withdrawn through the packing.)
With a socket wrench, remove the seat from the 4.
body. Remove and discard the body/bonnet gasket.
Soft seats are disassembled by removing the seat 5.
cap from the seat and then the soft seat can be
removed.
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Clean all parts with an approved non-residue-form-6.
ing solvent. Remove encrusted material with a very
ne Crocus or aluminum oxide cloth. However, do
not use these abrasives on the seating surface or
the trim surface (the portion of the plug that enters
the seat bore.) The machining tolerances on these
surfaces are so closely controlled that you might
change the valves ow characteristic.
Inspect all parts and replace and worn or damaged 7.
parts. It is always advisable to replace seals and
gaskets. DO NOT attempt to resurface seating surfaces of the plug or seat. Seats and plugs are only
sold in factory-matched sets.
Valve Reassembly
Soft seated valves: insert soft seat into the seat 1.
cavity, install the seat cap and tighten.
Lubricate the seat threads with a lubricant such as 2.
NO-LOK and thread the seat into the body. Torque
to values shown.
Valve Size
3/4” 26 310
1/2” 20 240
ft. - lbs. in. - lbs.
Seat Torque
Guided trim: coat the guide portion of the plug 3.
with MOLYKOTE G-Rapid Spray lubricant or an
equivalent light lubricant suitable for your service.
Assemble plug to stem.
Insert the stem into the bonnet. Set the gasket 4.
around the boss on the bonnet. Carefully assemble
the bonnet to the body and allow the plug to center
into the seat. Push down on the stem to be sure
that the plug has fully engaged the seat. Handtighten the body bolts.
Valve Size Gasket Material Quantity Required
All Teon 1
1/2” & 3/4” Grafoil 2
Remove and replace the packing as described in 5.
“Packing Replacement”.
While holding the plug rmly in position in the 6.
seat, secure the body to the bonnet with the bolts.
Torque bolts evenly to the values shown.
Torque Values (in. - lbs.)
Material
Gr. BD* 125 200 650 deg. (also SAE GR. 8)
Gr. B7 125 200 1000 deg. F
Gr. B6 125 200 900 deg. F (410 SST)
* Standard Bolting
Bolt Diameter
5/16” 3/8”
Limitation
Reassemble the two stem nuts and indicator all the 7.
way onto the stem threads.
If the actuator is reverse acting (ATO), apply ap-8.
proximately 6 psig air pressure to the actuator. If
MOTOR VALVE, position to full open.
Insert hex bolts through the yoke and into the bon-9.
net ange. Next, place the packing adaptor (7)
into the packing box, and then the packing gland
(9) over the top of the packing adaptor. Secure
the packing gland with the gland nuts (11). Thread
the stem into the actuator stem. Hold the actuator
stem with a wrench to prevent it from turning. Install the nuts onto yoke hex bolts and tighten. (You
can press down on the actuator to compress the
springs and bring the yoke into contact with the
bonnet ange.) The actuator spring preload must
be adjusted; refer to “Actuator Spring Preload Adjustment”. For Motor Valve see “Motor Valve Seat
Spring Pre-Load”.
Actuator Spring Preload Adjustment
The two stem nuts should be loosened and thread-1.
ed down on the stem and then locked together.
Lock the valve stem into the stem connector, then
thread the stem connector in the actuator stem.
A regulated air supply must be provided to the 2.
actuator. Connect the air to the lower case for reverse acting or to the upper case for direct action
actuators.
Standard actuators have ranges of either 3-15 psig 3.
or 6-30 psig. The range is stamped on the valve
nameplate. These instructions will assume that the
range is 3-15. If yours differs, substitute the appropriate pressure where these instructions refer to 3
or 15 psig.
4a. Direct Acting Actuator (ATC): Slowly increase the
air pressure up to 15 psig while observing the stem
for movement. Downward travel should stop exactly at 15 psig. If the downward travel stops before
15 psig is reached, thread the stem connector into
the actuator stem by wrenching on the locked stem
nuts and keeping the actuator stem from turning to
avoid twisting the diaphragm and/or toppling the
springs. If the downward travel continues after 15
psig is reached, thread the stem connector out of
the actuator stem.
4b. Reverse Acting Actuator (ATO): The valve plug
is closed against upward uid thrust by actuator
spring force. Total compression placed on the actuator spring must be sufcient to provide preload
plug force required to close the valve. If preload
adjustment is made with no pressure in valve body,
then, when the control valve is placed in operation, additional compression must be placed on the
spring to provide valve closure force. With proper
adjustment, valve will close tightly and will not begin to open until the preload pressure is exceeded.
Slowly increase the air pressure up to 3 psig while
observing the stem for movement. Adjust spring
preload until valve just starts to open when 3 psig
air pressure is supplied to the actuator diaphragm.
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Page 4
If there is valve movement at less than 3 psig:
thread the stem connector out of the actuator stem,
wrenching on the locked stem nuts and keeping
the actuator stem from turning to increase spring
preload. If there is no valve movement at 3 psig:
thread the stem connector into the actuator stem,
wrenching on the locked stem nuts and holding on
to the actuator stem to keep it from moving, to decrease spring preload.
Actuator Maintenance
Disassembly and Inspection of Actuator
Note: The actuator stem has two retaining rings. The purpose of these rings is to maintain compression on the
springs (to keep them in place) should the actuator be
removed from the valve bonnet. The upper ring functions
with reverse action and the lower ring functions with direct acting actuators.
Follow instructions under Maintenance section to 1.
remove valve from line.
Remove the actuator as described in “Removing 2.
Valve Actuator”.
Direct Acting Actuator (ATC)3. : separate the cases
by removing the bolts. Use a wrench on the ats
of the actuator stem to prevent it from turning and
remove the bolt and lockwasher. Lift off the diaphragm washer, diaphragm, diaphragm plate, and
ThredSeal. Remove the springs. If the actuator
stem is to be removed, remove one retaining ring
and push the actuator stem out. Remove and discard the o-ring and two backup rings.
Reverse Acting Actuator (ATO4. ): separate the cases
by removing the bolts. Remove the springs. Use a
wrench on the ats of the actuator stem to prevent
it from turning and remove the bolt and lockwasher.
Lift off the diaphragm plate, diaphragm, diaphragm
washer, and,ThredSeal. If the actuator stem is to be
removed, remove one retaining ring and push the
actuator stem out. Remove and discard the o-ring
and two backup rings.
If there is a need to clean the parts, use a solvent 5.
that will not harm Buna-N elastomers, such as Stoddard solvent.
indicated: ThredSeal, diaphragm plate, diaphragm,
diaphragm washer, and lockwasher. Secure them
with the bolt. Hold the actuator stem on the wrench
ats and tighten the bolts.
3b. Reverse Acting Actuator (ATO): attach the fol-
lowing parts to the top of the actuator stem in
the order indicated: ThredSeal, diaphragm plate,
diaphragm, diaphragm washer, and lockwasher. Secure them with the bolt. Hold the actuator stem on
the wrench ats and tighten the bolt.
4a. Direct Acting Actuator (ATC): hold this assembly
by the bolt head in a vise, stem pointing upward.
Install the springs over the dimples in the diaphragm plate. Take the lower case and carefully
install it onto the actuator stem by rmly pressing
the stem through the stem o-ring seal, keeping
the springs in place. Install the retaining ring into
the groove in the actuator stem. This will keep the
springs compressed and prevent them from coming out of place.
4b. Reverse Acting Actuator (ATO): install this assem-
bly into the lower actuator case by pressing the
actuator stem through the stem o-ring seal. Then
install the lower retaining ring onto the actuator
plate. Next, install the springs over the dimples in
the diaphragm plate.
Position the ange of the diaphragm on the ange 5.
of the lower actuator case and align the holes. Attach the upper actuator case with the bolts.
Reassemble the actuator to the valve as described 6.
in “Valve Reassembly” steps 8 & 9.
Reversing Action
Changing the valve action from direct to reverse acting
or from reverse to direct acting. Reversing the action of
the actuator reverses the action of the Mark 708 Control
Valve. The same parts are used for either action.
Disassemble the actuator as described in “Actuator 1.
Maintenance”.
Reassemble the actuator with the desired action. 2.
Refer to “Actuator Maintenance”. To change the action of a motor valve, refer to the instructions for the
motor actuator, which are provided with all Mark
708MV motor valves.
Reassembly of Actuator — 14M
Replacement of the actuator stem seal is recom-1.
mended. The o-ring and back–up rings are standard Buna-N, size 112. Lubricate and install the two
back-up rings and the o-ring into the cavity in the
lower case. The back-up rings are installed on either side of the o-ring.
The retaining ring closest to the top end (bolted) of 2.
the actuator stem must be in place. The retaining
ring nearest the other end ((with wrench ats) must
be removed.
3a. Direct Acting Actuator (ATC): attach the following
parts to the top of the actuator stem in the order
Motor Valve Seat Spring Preload
Position the valve to be full open.1.
The two stem nuts should be loosened and thread-2.
ed down the stem and then locked together.
Slowly stroke the motor to closed position, while 3.
rotating valve stem and stem nuts back and forth
(approximately ¼ turn). Caution: valve stem should
rotate freely. When it no longer rotates freely, the
plug is in contact with the seat, and the motor must
be stopped or damage may occur. If required, the
valve stem may be threaded into the actuator stem
to allow motor to complete stroke.
With motor in full closed position and stopped by 4.
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Page 5
limit switch, rotate the stem down until the plug is
in contact with the seat, and turn and additional ¼
- ½ turn to preload the seat.
Position motor to open position, and conrm that 5.
the motor is stopped by the limit switch prior to
the plug reaching the upper stop. Without rotating
the stem, thread the stem nuts up and lock them
against the actuator stem.
Note: limit switches and high/low set points are
factory-set. If command signal range will not fully
stroke the valve, refer to electrical connection diagram for the motor actuator that was shipped with
the valve. With seat spring preload set, if plug hits
upper stop prior to limit switch, the limit switch will
require adjustment; consult factory for procedure.
Trim Removal Instructions
Referring to drawing below:
Remove four bolts (1), and remove body.1.
Loosen nut (3). Keep connector (2) from rotating.2.
DO NOT loosen nuts (4) as this would change ac-3.
tuator spring adjustment.
Unthread stem (5) from connector.4.
Push stem (5) through body. (DO NOT push stem 5.
threads through packing unless stem is being replaced.)
Slide plug (6) off stem. 6.
Remove and install new seat (9) – optional.7.
Install new gasket (7). Install new packing (8) if stem 8.
is removed.
Assemble in reverse order. Note: stem must be 9.
threaded into connector until bottomed out to
maintain stroke adjustment.
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 identication tag. 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.
NOTE: Any parts ordered without a valve serial number
that are found to be incorrect are subject to up to a minimum 25% restock charge when returned.
Trouble Shooting
If You Experience Erratic Control:
Oversizing can cause cycling or hunting (recalcu-
late the size required).
Undersizing can cause the control point to drop off
under peak loads (increase the trim size).
Inlet pressure to the valve maybe varying signi-
cantly and the controller may not be following it
(adjust the controller).
Control loop may require equal percentage trim if
high rangabilities are being utilized.
Steam traps may need reconditioning.
Safety relief valves may be leaking.
Valve stroke may be out of adjustment or there may
be foreign matter in the valve preventing full movement.
If You Experience Insufcient Flow:
Check shutoff valves to be sure they are fully open.
Inlet pressure to valve may be insufcient to pro-
vide the needed ow (check the inlet pressure with
a pressure gauge).
Strainers should be checked for clogging and
4
2
5
3
8
Clearance
6
7
9
1
-5-
blown down if needed.
Steam traps may need reconditioning.
Dirt in the trim may prevent the valve from passing
its full capacity.
Diaphragm failure or insufcient air pressure to re-
verse acting (air-to-open) actuators would prevent
the valve from properly stroking open. Incorrect actuator spring adjustment in reverse acting actuators
would prevent the valve properly stroking open.
If You Experience Overpressure (outlet):
Dirt in the trim may prevent valve from shutting off.
Diaphragm failure, incorrect actuator spring adjust-
ment, or insufcient air pressure to direct acting
(air-to-close) actuators would prevent the valve
from properly stroking closed.
Page 6
Reverse Acting (3-15)
19
15
17
18
39
16
13
Direct Acting (3-15)
12
6
11
21
4
38
35
20
27
10
5
32
34
8
34
9
33
27
20
7
9
24
23
22
26
24
2
25
28
17
14
11
11
14
15
28
18
1219
13
39
8
37
29
3
30
1
1/4-1/2” 3/15, 14M, w/ Hard Seat Shown
Item Description Qty. Item Description Qty. Item Description Qty.
1 Body 1 14 Diaphragm 1 27 Retaining Ring 2
2 Bonnet 1 15 Spring 3 28 Spacer (Std 3-15 only) 1
3 HHCS, 5/16-18 X 2” 4 16 Upper Case 1 *29 Seat 1
4 Namur Yoke 1 17 HHCS, 1/4-20 X 1/2” 9 *30 Plug 1
*5 Valve Stem 1 18 HHCS, 1/4-20 X 3/4” 1 32 Packing Spring 1
6 Lower Case 1 19 Lockwasher, 1/4” 1 33 Spring 1
7 Stem Connector 1 20 Back-Up Ring 2 34 Retaining Washer 2
8 Actuator Stem 1 21 O-Ring 1 35 Packing 1
9 Hex Nut, 10-24 4 22 Gland 1 37 Body Gasket 1
10 Washer 1 23 HHCS, 5/16-18 X 1-1/4” 2 38 Adapter 1
11 Threadseal 2 24 Hex Nut, 5/16-18 4 39 Breather Vent 1
12 Diaphragm Washer 1 25 HHCS, 5/16-18 X 1” 2 40 Lantern Ring 1
13 Diaphragm Plate 1 26 Lockwasher, 5/16 2 * Recommended Spare Parts
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Page 7
Mark 708 Packing Assembly for Namur Yoke
Adaptor
Packing
Packing Washer
Spring (2)
Packing Washer
Packing Washer
(exotic material)
Spring (2)
Adaptor
Packing
Packing Washer
(exotic material)
Standard Packing
Packing Washer
Spring (2)
Packing Washer
Packing (Inverted)
Adaptor
Inverted Packing - for Exotic Body Material
(Put spring on top of packing.)
(JV P/N 92065)
Adaptor
Packing Rings
Bottom Ring
Lantern Ring
Packing Rings
Bottom Ring
Packing for Vacuum
(Invert packing rings and put spring on top)
(JV P/N 96071)
Packing Washer
Double Packing
-6-
Page 8
31
10
48
28
11
3
Illustration and Parts List
Item Description Qty.
1 Body / Bonnet Bolt 4
2 Bonnet 1
46
49
47
Shown 90° out
of position
45
36
9
39
38
4
7
6
5
8
33
2
1
34
35
3 Body / Bonnet Gasket 1
4 Body 1
5 Retaining Washer 1
6 Packing Set 1
7 Packing Adapter 1
8 Packing Spring 1
9 Packing Gland 1
10 Hex Bolt 2
11 Gland Nut 2
28 Support Leg 2
31 Nut 2
33 Valve Stem 1
34 Plug 1
35 Seat 1
36 Stem Nut 2
38 Soft Seat (optional) 1
39 Seat Cap 1
45 Mounting Bracket 1
46 Motor 1
47 Stem Connector 1
48 Mounting Plate 1
49 Nut 1
* Recommended Spare Parts
Bulletin IM-MK708-1109
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowowvalve.com
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