Page 1
I & M Mark 708HP / 708HPA
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 708HP/708HPA 35M Actuator
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!
ally suitable for this purpose. Line strainers are
available from Jordan 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
Valve parts, available for immediate shipment from the
factory.
For best control, 3’ 0” straight sections of pipe 5.
should be installed on either side of the valve.
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.
Ideal Installation
The ow arrow on the valve body must be pointed 7.
in the direction of the ow. 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.
3
4
1
1
5
2
1
2
4
6
R
If possible, install a relief valve downstream from 8.
the valve. Set at 15 psi above the control point of
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 10.
1
1. Shut off Valve
2. Pipe Union
3. Strainer and Drain Valve
4. Pressure Gauge
5. Mark 708HP/HPA
6. Relief Valve
velocities to decide when smaller outlet piping
might 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.
To control very low ow rates, Mark 708HP/HPA 1.
control valves are often provided with trims having
very small clearances. To keep this trim functioning properly, it is essential that the uid owing
through the valve be clean.
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 pip-3.
ing 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 4.
of the valve to protect it from grit, scale, and other
foreign matter. A 0.033 perforated screen is usu-
Start-Up Procedure
Be sure that the action of the control valve and 1.
of the controller are such that you achieve the
desired results. The action can be changed if
needed using the instructions shown in “Reversing
Action”.
Increase in
temperature or
pressure 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 2.
Valve, 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
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.
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 Follow Steps...
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
Changing Valve Action Reversing Action
Motor Valve Seat Spring Preload Motor Valve Seat Spring Preload
Valve Disassembly
Actuator Spring Load
Adjustment
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.
Remove the actuator from the bonnet. (See Re-1.
moving Actuator from Valve.)
Removing Actuator from Valve
Direct Acting Actuator (ATC)1. : Shut off pressure
to the actuator and remove supply tubing from
the actuator case. Reverse Acting Actuator (ATO):
Apply approximately 12 psig air pressure to the
actuator to lift the plug off of the seat.
Remove the actuator from the valve as follows: 2.
loosen the two stem nuts and move them down
the stem. Lock these nuts together. Remove the
packing nut and yoke lock nut. Using a wrench on
the nuts and on the ats of the actuator stem, turn
the valve stem (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 “Remov-1.
ing Actuator”.
Remove the bonnet ring nut (4).2.
Remove stem nuts (32) and indicator (19). Pull 3.
the bonnet (3) straight up and out of the body (1).
Withdraw the plug/stem(5) downward to remove
from the bonnet (3).
Using a hook tool, carefully remove the ex seal 4.
(34) from the groove in the bonnet bore and discard. Using a deep socket wrench, remove the
seat (2) from the body (1).
Clean all parts with a non-residue forming solvent. 5.
Remove encrusted material with a very ne crocus
or aluminum oxide cloth. DO NOT attempt to polish the seating surface or trim surface (the portion
of the plug that enters the seat bore.) The machining tolerances on these parts are closely controlled and ow values could change as a result.
Inspect all parts and replace those that are worn 6.
or damaged. The ex seal (34) cannot be re-used
and must be replaced every time the bonnet is
removed, and replacement of the packing set (33)
is generally advisable.
-2-
Page 3
Valve Reassembly
Lubricate the seat (2) threads with a suitable lu-1.
bricant such as NO-LOK and thread the seat into
the body (1) (Note: Mk708HPA body is an angle
pattern with the inlet at the bottom, however all
instructions still apply). Tighten to 20 ft-lbs (240
in-lbs).
Install the metal seat ring (34) into its groove in the 2.
body.
Coat the guide portion of the plug/stem (5) with 3.
DOW CORNING G-n Metal Assembly Spray (750°
F) according to manufacturer’s instructions. Insert
the plug/stem into the bonnet (3).
Coat the coarse exterior bonnet threads on the 4.
body (1) with a suitable anti-seize compound intended for use on stainless steel. Install the bonnet (3) onto the body, and then thread the bonnet
ring nut (4) over the bonnet and onto the threads
on the body. Carefully push down on the stem to
be sure that the plug has fully engaged the seat.
Tighten the bonnet lock nut until a positive stop is
felt.
Bring the yoke (6) into full contact with the bonnet 5.
(3) centering it on the hub. Install the yoke lock nut
(7) and hand tighten.
Lubricate the packing set (33) with Dow Corn-6.
ing #6 and install the packing set into the bonnet
bore. Thread the Packing nut (8) onto the bonnet
(3) and tighten loosely. Assemble the two stem
nuts (32) and indicator (19) all the way on to the
stem threads.
Reverse Acting Valves (Air To Open)
Insert the valve stem (5) into the actuator stem 1.
(11). Hold the actuator stem with a wrench to prevent it from turning. Spring preload is adjusted by
threading the valve stem (5) into the actuator stem
(11). Hold the actuator stem from turning with a
wrench and using the stem nuts (32) turn the valve
stem. Threading the valve stem into the actuator
stem decreases preload and threading out increases preload.
Slowly decrease the air pressure down to 11 psig 2.
while observing the stem for movement. When the
plug hits the seat tighten the yoke lock nut (7) and
the packing nut until it stops.
Correct spring preload is when the valve stem 3.
starts to move when the actuator pressure reaches
11 psig.
If movement occurs before 11 psig then increase 4.
the preload. If movement occurs at a pressure
higher than 11 psig then decrease the preload.
After the preload is set, lock the stem nuts (32) 5.
against the actuator stem (11).
Increase pressure to 20 psig and the valve should 6.
stroke approximately full open (0.500”).
Actuator Maintenance
Remove the actuator as described in “Removing 1.
Actuator.”
Remove the nuts (24) and bolts (25) which hold 2.
the upper actuator case (23) to the lower actuator
case (9) and remove the upper actuator case.
Actuator Preload Adjustment
Direct Acting Valves (Air To Close)
Insert the valve stem (5) into the actuator stem 1.
(11). Hold the actuator stem with a wrench to prevent it from turning. Spring preload is adjusted by
threading the valve stem (5) into the actuator stem
(11). Hold the actuator stem from turning with a
wrench and using the stem nuts (32) turn the valve
stem. Threading the valve stem into the actuator
stem increases preload and threading out decreases preload.
Load an air supply into the upper case. Slowly 2.
increase the air pressure up to 18.5 psig while
observing the stem for movement. When the plug
hits the seat, tighten the yoke lock nut (7) and also
tighten the packing nut until it stops.
Correct spring preload is when the valve plug 3.
contacts the seat at the time the actuator pressure
reaches 18.5 psig.
If seating occurs before 18.5 psig then increase 4.
the preload. If seating occurs at a pressure higher
than 18.5 psig then decrease the preload.
After the preload is set, lock the stem nuts (32) 5.
against the actuator stem (11).
Reduce pressure to 11 psig and the valve should 6.
stroke approximately full open (0.500”).
Direct Acting Actuator (ATC):
Remove the actuator stem bolt (22) and lift the 1.
seal washer (17), diaphragm (16), diaphragm plate
(15), and spacer (27). Remove the actuator stem
(24).
To check the stem o-ring (35), unscrew the gland 2.
nut (13) from the gland (12) and remove the stem
o-ring from the end of the gland.
Reverse Acting Actuator:
Remove springs (38)& (39) from diaphragm plate 1.
(15). Remove the actuator stem bolt (22) and lift
spacer (27), diaphragm plate (15), diaphragm (16),
seal washer (17) and seal ring (18) from the actuator stem (11).
Remove the actuator stem (11). To check the stem 2.
o-ring (35), unscrew the gland nut (13) from the
gland (12) and remove the stem o-ring from the
end of the gland.
Clean all parts with an approved, non-residue-3.
forming solvent. Remove encrusted material with
crocus clother or very mild aluminum oxide cloth.
Inspect all parts for excessive wear and/or damage. Replace any worn or damaged parts.
-3-
Page 4
Reassembly of Actuator
Trouble Shooting
After all parts have been thoroughly cleaned and in-
spected, reassemble the actuator:
Assemble actuator bolt (22), fastener seal (18), seal 1.
washer (17) (with counter bore towards actuator
bolt), diaphragm (16), diaphragm plate (15), spacer
(27) and thread into the actuator stem (11) and
tighten.
Set the diaphragm assembly down on a at sur-2.
face with the actuator stem facing up. Place small
amount of Parker O-Lube or comparable lubricant
on the actuator stem. Then place the inner and
outer springs (38 & 39) on the diaphragm plate,
nested over the stamped bosses, and one set in
the middle over the actuator stem (11).
Take the yoke/ lower case assembly and place 3.
over the springs, centering the actuator stem (11)
over the gland (12). Now take this entire assembly
rmly holding the diaphragm assembly and the
lower actuator case (9) together and ip it over
(making sure the springs do not move out of position and are not hitting on any bolt heads (24A)
from the lower case).
Place the upper actuator case (23) on the dia-4.
phragm, lining up the bolt holes.
Place the 2 longer bolts (24B) and nuts (25) 180° 5.
apart and tighten evenly to draw the upper case
(23) down onto the lower case (9). Install the remaining bolts and nuts and tighten evenly while
alternating across the actuator case.
35M Reverse Acting Actuator ATC
(Air to Close)
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
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.
Assemble actuator bolt (22), spacer (27), dia-1.
phragm plate (15), diaphragm (16), seal washer (17)
(with counter bore towards actuator stem), fastener
seal (18) and thread into the actuator stem and
tighten.
Place diaphragm assembly down into lower case/2.
yoke assembly made in step 2, making sure to
guide the actuator stem thru the gland. Line up the
holes in the diaphragm (16) with the holes in the
lower diaphragm case (9).
Place the inner and outer springs (38 & 39) on 3.
the diaphragm plate, nested over the stamped
bosses, and one set in the middle over the actuator bolt(22)
Place the upper actuator case (23) on the dia-4.
phragm (16), lining up the bolt holes.
Place the 2 longer bolts (24B) and nuts (25) 180° 5.
apart and tighten evenly to draw the upper case
(23) down onto the lower case (9). Install the
remaining bolts (24A) and nuts (25) and tighten
evenly while alternating across the actuator case.
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.
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.
-4-
Page 5
Illustration and Parts List
23
17
14
18
39
12
38
22
27
15
16
24A 24B
25
9
21
20
6
32
35
11
13
19
5
8
33
7
4
3
34
2
1
Item Description Qty. Item Description Qty. Item Description Qty.
1 Body 1 13 Gland Nut 1 24A HHCS, 5/16-18 X 0.875” 6
*2 Seat 1 14 Gasket 1 24B HHCS, 5/16-18 X 1.75” 2
3 Bonnet 1 15 Diaphragm Plate 1 25 Nut, 5/16-18 8
4 Bonnet Ring Nut 1 16 Diaphragm 1 26 Travel Scale (not shown) 1
*5 Stem Plug 1 17 Seal Washer 1 27 Spacer 1
6 Yoke 1 18 Fastener Seal 1 32 Jam Nut, 1/4-28 2
7 Yoke Lock Nut 1 19 Washer 1 *33 Packing 1
8 Packing Nut 1 20 HHCS, 1/4-20 X 0.75” 6 *34 Metal Seat Ring 1
9 Lower Actuator Case 1 21 Threadseal 6 *35 O-Ring 1
11 Actuator Stem 1 22 HHCS, 5/16-18 X 1.25” 1 38 Inner Spring 7
12 Gland 1 23 Upper Actuator Case 1 39 Outer Spring 7
* Recommended Spare Parts
Bulletin IM-MK708HP/HPA-0909
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowowvalve.com
Loading...