Clarkson Manuals: Model C-Valve Slurry Control, IOM, Clarkson-EN Manuals & Guides

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

Before installation these instructions must be fully read and understood

4.6 Pneumatic hydraulic pilot ....................... 22

4.7 Pneumatic hydraulic power unit ............ 23

4.8 2GL hydraulic power unit ........................ 24

4.9 2GL wiring schematic:

C-ValvewithPLCcontrol ........................ 27

4.10 Detail: wiring PLC

modiconmicro#61200 ........................... 27

1 C-VALVE BODY AND SLEEVE

1.1 GENERAL INFORMATION

The Clarkson C-Valve is a throttling valve
designed for slurry flow control. Though in
some small sizes, the C-Valve will shut-off
without damage, IT IS NOT A SHUT-OFFVALVE.

CONTENT

1 Valve (body/sleeve) .................................... 1

1.1 General information .................................. 1

1.2 Operation ................................................... 1

1.3 Installation ................................................. 2

1.4 Maintenance .............................................. 2

1.5 Hydraulic fluid selection ........................... 3

2 Actuators ................................................... 3

2.1 Manual hydraulic handpump actuation ... 3

2.2 Pneumatic hydraulic actuators

(unitizedactuator) ..................................... 4

2.3 Pneumatic hydraulic pilot

actuators(kindle pilot) ............................ 11

2.4 Clarkson C-Valve with PLC
(programmable logic controller)

system ...................................................... 11

3 Troubleshooting and preventative

maintenance ............................................ 12

3.1 Preventative maintenance ...................... 12

3.2 Troubleshooting unitized actuators ....... 13

3.3 Troubleshooting PLC system ................. 13

3.4 Nominal C-Valve maximum

hydraulicpressure .................................. 14

4 Part identification .................................... 14

4.1 Range spring application for

unitizedactuators ................................... 14

4.2 C-Valve C1-8 legend ............................... 15

4.3 C-Valve C1-2 actuator legend ................ 16

4.4 C-Valve C3-4 actuator legend ................ 18

4.5 C-Valve C6-8 actuator legend ................ 20

Complete “bubble-tight” shutoff is not
guaranteed. The valve has a cast ductile iron
body which contains an elastomer muscle.
The liner or sleeve is a molded elastomer
part which is contained within the muscle.
The sleeve is retained within the valve body
with hard elastomeric retainers or, on the
6 inch and 8 inchsizes, with cast ductile iron
retainer flanges. The C-Valve is available with a
large selection of reduced port sleeve sizes and
elastomers to fit many different applications.

1.2 OPERATION

The C-Valve is actuated by applying low
pressure hydraulic fluid to the outer surface
of the muscle. The muscle squeezes inwardly
on the sleeve which forms a variable orifice.
The normal operating range is from full open
to ½ of wide open port diameter. The port will
remain round and concentric up to this point.
Valves with port diameters of 2 inches or
smaller can be completely shut-off. The port
closes out of round at shut-off. Since the
hydraulic fluid is in contact with the elastomer
muscle, care in fluid selection is important
to assure maximum service compatibility.
Fluid selection is discussed in Section 1.5
“Hydraulic fluid selection”. Actuators for the
C-Valve are covered in Section 2 “Actuators”.
See Section3.4 Table 1 for closing pressures.

Emerson.com/FinalControl © 2017 Emerson. All rights reserved. VCIOM-03227-EN 18/06

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

Housing

Sleeve

1.3 INSTALLATION

The C-Valve is usually installed with ASME
B16.5 Class 150 standard pipe flanges using
hex head cap screws. To insure complete
sleeve support, use flat or raised faced
companion flange with the contact surfaces
that extend to the inside diameter of the
C-Valve sleeve. The valve may be installed
between concentric bell type reducers if the
C-Valve is smaller than the pipeline. The
use of flange gaskets is recommended on
all C-Valves, but not required on NPS 4 and
smaller valves. The valve should be located
5-10 pipe diameters away from any flow
disturbance, other than concentric reducers.
Install the C-Valve with the hydraulic
connection on bottom of the body to facilitate
purging the air from the valve top port. The
piping used for the hydraulic fluid should be
of adequate size to allow the valve to follow
the control system with a minimal amount
oflagtime.

1.4 MAINTENANCE

Normal maintenance of the C-Valve
involves replacing the sleeve or the muscle.
These will be covered separately but both
require removing the C-Valve from the pipeline.
SeeFigure 1.

• Disconnect the hydraulic line from the

C-Valve.

• Remove the flange bolts securing the

valveinto the pipeline.

• Spread the pipeline flanges enough to

removethe C-Valve.

• Using a hoist as required, remove the

valvetoa suitable working area.

Muscle

Retainer

1.4.1 Sleeve replacement

Sleeve replacement is the most common
maintenance performed since this is the
wear part in the slurry valve. It is performed
as periodic maintenance, or due to failure.
Failureis indicated by process fluid leaking
from the weep holes in the end of the valve
body near the pipeline flange connection.
Thesleeve replacement procedure follows:

• Remove the hard elastomer sleeve retainer
by prying out with a large screwdriver. For
NPS 6and 8 valves remove the ductile iron
retainer flanges by first removing the slotted
flat head machine screws, then prying off
theflange.

• Relieve any residual hydraulic pressure
fromthe valve body.

• If the sleeve is loose, it can be pulled from
the valve body. If not, it may be necessary
toloosen the sleeve by sliding a piece
of lubricated banding strap around the
sleeveOD to loosen it. Another method of
loosening the sleeve from the housing is to
bend a piece of brazing rod into a ‘crank’
shape and inserting it into the interface.
A cranking motion will roll the rod around
the sleeve and loosen it. The sleeve may now
beremoved.

• Prior to installing the new sleeve, inspect
the valve ID for damage and wipe it clean.
Alittle water applied into the cavity will aid
ininserting the new sleeve.

• Center the sleeve in the valve body and apply
just enough pressure to the valve body port to
hold it in place for retainer installation. Install
the elastomeric sleeve retainers with a soft
mallet. For NPS 6 and 8 valves with metal
retainer flanges, use the main flange bolts
with adequate washers to pull the flanges
into place. Be sure to tighten the flanges from
both ends evenly or they may not fully seat.

The flat head machine screws can then be
inserted and the flange bolts removed. Be
sure to use an anti-seize on the tapped bolt
holes to allow future removal.

• Actuate the valve to insure the valve
operates properly and the port
remains nearly round for a diameter
reduction of not more than50%.
On the smaller valves with elastomeric
sleeve retainers, pressurizing the body port
will cause the ends of the sleeve, with the
retainers, to telescope out from the flange.
It is best not to stroke this sleeve more than
about 30% closed since over-stroking the
muscle without the pipeline companion
flanges for support can cause the muscle
torupture.

2

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

1.4.2 Muscle replacement

The muscle usually lasts through several
sleeve replacements. The failure mode is
either rupture from over pressuring, or
excessive swelling due to chemical attack
from the hydraulic fluid. Muscle failure is
indicated by hydraulic fluid escaping from the
weep hole on the valve body near the pipeline
flange connection or failure to fully open
due to swelling. The muscle replacement
procedureisas follows:

• With the valve in a suitable working area,
and the sleeve, retainers, and hydraulic
fluid removed, place the valve body on end
and remove all the bolts and nuts from the
valvebody.

• Match mark the valve body halves, for later
assembly.

• Carefully pry apart the body halves, taking
care not to damage the sealing surfaces.

• Pry out the muscle. This is sometimes
difficult, and a lifting strap and come-a-long
are often helpful on large valves.

• Clean and inspect the valve body castings in
the bottom of the inner cavities and on the
sealing flanges.

• Lubricate the ends of the new muscle, at the
inside corners only, extending about halfway
to the OD, and about the same distance
down into the ID and all the way around.
Use a grease which is compatible with the
elastomer muscle, such as a silicon based
grease, since a petroleum based grease
willdamage the elastomer.

• Place the lubricated muscle into one of
thevalve body halves and firmly seat it
intothe cavity.

• Install the new seal gasket or O-ring at the
body flange.

• Place the second body half in place and align
the match marks.

• Work the housing down onto the muscle as
far as possible and install the bolts and nuts.

• Tighten the bolts in a crossing pattern, a little
at a time, evenly until the housings are fully
seated together.

• Apply 40 psi air to the valve body port to
insure the muscle closes round.

• Check the ID at the elastomer/metal interface
and the bolted center flange for any leaks.
Ifleaks are found, repeat the above process
to find the fault.

• The valve is now ready for sleeve installation,
see Section 1.4.1 “Sleeve replacement”.

1.5 HYDRAULIC FLUID SELECTION

There are two different fluids recommended
foruse with the Clarkson C-Valve.

For use with any unitized actuator we
recommend a ‘Low silicate’ antifreeze
without stop leak. This can be used
concentrated as purchased or mixed with
water to approximately 50%. This fluid
is fully compatible with the elastomeric
C-Valvemuscle.

• For actuation with a system using an electric
hydraulic pump unit with a kindle pilot
or electro-hydraulic control system, we
recommend the use of turbine oil. Tests have
shown that Chevron GST 32 turbine oil, Shell
turbo oil #32, and Texaco Regal R&O 32 will
minimize the swelling usually associated
with the elastomer in contact withoil.
Other acceptable turbine oils may exist,
consult the factory for recommendations.
Normal hydraulic oil is not recommended
as the elastomer swelling may be rapid
and significant causing valve operation
problems. Swollen elastomer parts can
causevalvestofail.

2 ACTUATORS

2.1 MANUAL HYDRAULIC HAND PUMP

ACTUATION

2.1.1 General information

The simplest method of actuation for the
C-Valve is by the use of a hand pump. The hand
pump allows manual adjustment of the
hydraulic pressure and therefore the C-Valve
port size and slurry flow rate. The pump units
available from the factory include a lever
operated piston pump, pressure release valve,
reservoir, hydraulic hose with female quick
disconnect coupling, and pressure gauge.
Several models are available with varying flow
rates and reservoir capacities as required by
different C-Valve sizes. These units can be left
connected to a C-Valve for convenient flow
adjustment or can be disconnected and moved
from one C-Valve to another. See Table 1 for
actuation pressures.

2.1.2 Operation

To adjust the flow through a C-Valve,
connect the manual hand pump unit to
the male quick disconnect fitting on the
valve body and close the pressure release
valve. Be sure the pump air vent screw on
the fill cap is open before pumping fluid.
Then pump until the desired hydraulic
pressure is shown on the pressure gauge.
At this time the pump can be left in place
or canbe uncoupled and moved to the next
desired location. The check valve in the male
fitting on the C-Valve will hold the pressure
when disconnected. After removing the pump
unit from the C-Valve, open the pressure
release valve to drop the pump pressure.
Reinstall the protective cover on the male
coupling on the C-Valve. It is necessary to
leavethe pressure release valve open in order
to reconnect the quick disconnect couplings.

3

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

2.1.3 Installation

Fill the reservoir with the appropriate hydraulic
fluid and connect the coupling to the C-Valve
to be operated. See Section 1.5 for ‘Hydraulic
fluid selection’. Remove the protective cover
from the male fitting on the C-Valve, and attach
the female coupling on the pump unit hose
to the C-Valve body. This is accomplished by
opening the pressure release valve and sliding
the knurled sleeve back on the female coupling.
Then push the couplings together and release
the sleeve. If desired, the couplings can be
removed from the pump and C-Valve and the
hose can be connected directly to the C-Valve
port. Since the hydraulic fluid is subject to
freezing (-30ºF and below), it is best to locate
and store the pump inside a building, or to
provide heating.

2.1.4 Maintenance

Maintenance of the manual hand pump unit
is generally limited to keeping the unit clean
and full of fluid. It is especially important to
keep the coupling on the hydraulic hose clean.
If the pump fails to pump fluid or maintain
pressure, the piston and pressure release valve
can be disassembled, cleaned and inspected.
Insure all check balls, cavities and O-rings are
in good condition. If not, repair or replace the
defectiveparts.

2.2 PNEUMATIC HYDRAULIC ACTUATORS
(UNITIZED ACTUATOR)

2.2.1 General information

The unitized actuator system has been
designed for the Clarkson Series C-Valve to
operate through its throttling range without
need of an auxiliary hydraulic pressure source.
The unit operates on up to 75 psig air supply
and is controlled by a 3-15 psig pneumatic
input signal. The actuator can be mounted
directly on the valve or in a remote location.
Unless otherwise specified, it will be shipped
from the factory mounted on the valve and
precharged with hydraulic fluid. (For these
actuator systems see ‘Hydraulic fluid selection’
in Section 1.5).

2.2.2 Operation

A pneumatic positioner controls the position
of the unitized actuator piston assembly by
following a 3-15 psig pneumatic input signal.
The large area pneumatic piston is directly
coupled to a smaller area hydraulic piston,
so that the air pressure is amplified into a
higher hydraulic pressure in the hydraulic end.
The pressurized hydraulic fluid is displaced
through a hydraulic hose into the C-Valve to
attain the desired valve closure.

For each C-Valve size, the hydraulic cylinder
is sized to displace sufficient hydraulic fluid
volume and pressure to obtain the maximum
recommended closure. This requires that the
range spring for the pneumatic positioner
be matched to the proper valve / port size
toinsurecorrect actuator stroke.

2.2.3 Installation

The main concern when installing the unitized
actuator is to orient the vent port so that
the air in the hydraulic system can be fully
purged during charging. Allow access to the
charging fitting on the valve body, as well as the
positioner and I/P adjustments. The air supply
should be filtered and regulated to insure the
pneumatic positioner is protected from dirt and
moisture. The filter bowl should be orientated
so that the drain will function. These same
requirements will be necessary whether the
actuator is valve or remote mounted. The only
other requirement for remote mounting is to
allow all air to be purged from the hydraulic
line connecting the valve body to the actuator
by eliminating any ‘high spots’ in the line which
cannot be vented. Whenever possible, the
unitized actuator should be mounted above
the level of the C-Valve body and the charging
fitting on the valve body should be located at the
lowest point. Since the hydraulic fluid is subject
to freezing, it is best to locate the actuator
inside a building, or to provide heating.

The unitized actuator requires a maximum of
75 psi regulated, filtered air supply. The air
supply is connected at the ¼ NPT port on the
positioner. It is recommended that the air
supply pressure be regulated to the lowest
value necessary to actuate the valve. This air
pressure can be noted on the air diaphragm
pressure gauge, located on the positioner.

2.2.3.1 I/P transducer and positioner

installation and calibration

The current to pressure transducer (I/P) used
with the Clarkson C-Valves is the Conoflow
Model GT18. The normal input is 4-20 mADC,
which is converted into a 3-15 psig air signal.
There are two adjustments which can be made:
range and zero adjustment. See conoflow
installation and maintenance manual for
instructions (Section 5.3).

The Moore products Model 73N12F direct
acting and 73N12FR reverse acting positioners
are used on the NPS 1 to 4 Clarkson C-Valves.
For installation see the manufacturers’ Service
instructions SD73 (Section 5.1). Calibration of
these positioners is limited to the range spring
selection, and the zero adjustment. See Table 2
(Section 4.1) for ‘Range spring application’.

4

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

NOTE

The range springs selected for NPS 3 and 4 C-Valves
are chosen to operate the valve so that port diameter
changes from full open to approximately 50%
diameter reduction. Valves with 2 inch diameter ports
and smaller will operate from full open to nearly
full closure. Overclosing the valve will damage the
elastomeric muscle.

To adjust zero position, set input signal to 3psi
(15 psi for reverse acting ). Turn adjusting
screw until air diaphragm pressure barely
starts to rise. For later models sizes NPS 1- 4
use the movement of the visual travel indicator
as a set point. Back off screw slightly so that
3psi (15 psi for reverse acting) yields 0 psi air
diaphragm pressure.

WARNING

When installing a unitized actuator equipped with
a 73N12FR “reverse acting” pneumatic positioner,
it is very important to insure the 3-15 psig air
signal is applied to the positioner BEFORE the
supply air is connected. Failure to follow this
recommendation can over pressure the valve
anddamage the valve muscle.

The NPS 6 and 8 valves use the Moore products
Model 74N positioner with instrument and
diaphragm loading gauges. This model has
an external tension type range spring which
is adjustable within its designed stroke range.
Seethe Moore products service instructions
SD74 (Section 5.2) for calibration.

NOTE

The stroke adjustment for the large C-Valves should
be set to operate the valve’s inside diameter port from
full open to approximately 50% diameter reduction.
Over-closing the valve will damage the elastomeric
muscle.

2.2.3.2 Remote actuator mounting procedure

It is sometimes necessary to mount the unitized
actuator remotely from the C-Valve. This may
be due to maintenance access, process
considerations such as vibration, temperature,
etc. Tubing between the actuator and the valve
should be ⅜ I.D. or larger and provide air vents
at any high spots. Trapped air and restricted
flow will diminish the valve’s performance.

• If possible, make the hose or tubing-run with
a continuous grade to eliminate air pockets.

• If a continuous grade is impracticable, install
vents at all air-trap points.

• Install the C-Valve with the hose or tubing
connected to the top port of the valve.

• When charging the circuit, connect the
charging pump to the bottom port of the
C-Valve.

• Open the vents in order of their location
withthe one nearest to the C-Valve first.

• Pump fluid into the C-Valve until all air
is purged from each vent and then close
thevent(s).

• Move to the next vent point and repeat
charging step until all including the
actuatorvent are charged.

2.2.3.3 Rotation of actuators

It may be necessary to rotate the C-Valve from
horizontal to vertical pipeline mounting or the
reverse. Consider the following suggestions:

• The actuator fluid vent plug, located near the
hydraulic hose, should be the high point in the
system to facilitate charging with hydraulic
fluid and complete venting of all trapped air.

• The optional filter regulator should be
positioned to allow any trapped airline
moisture to be drained.

• If the actuator vent hole is subject to a dirty
environment, it may need to be protected.
This can be accomplished by installing a
breather/vent in the port and plugging the
tapped holes. It is important not to plug
thevent since venting is necessary.

• The mounting between the actuator and the
valve body is designed to allow installation
with the fluid vent plug remaining at the
highest point in the system regardless of
pipeline orientation. The actuator will operate
in any orientation, but it is recommended that
the vent be on top to aid in recharging the
hydraulic fluid.

• The filter regulator will need to be re-tubed to
accommodate its new position. Use only the
comparable size and type tubing and fittings
as were supplied with the original equipment.

• It may be desirable to rotate the I/P converter,
if provided. This will allow the electrical hook
up, test, and adjustment points to be made
more accessible.

The unitized actuator system is made up
oftwomajor components:

1. The air over hydraulic actuator

2. The positioner
The positioner used on 1 inch through 4 inch
C-Valve actuators is the Moore products
Model73N12F direct acting or Model73N12FR
reverse acting, built-in positioner; and on
the 6 inch and 8 inch C-Valve actuators the
Model 74 side mount positioner is used.
For service instructions, see Moore products
service instructions SD73 or SD74 (Section

5.1 and 5.2). These positioners operate on a
3-15 psig air signal.

When remote actuator mounting is desired
the following suggestions will eliminate most
potential problems:

• If possible, mount the actuator higher than
the C-Valve.

• Mount the actuator with the vent port at
thehighest point in the system.

2.2.4 Maintenance

2.2.4.1 Actuator assembly and disassembly
instructions

NOTE

All components must be thoroughly cleaned priorto
performing these procedures.

5

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

2.2.4.1.1 Unitized actuator for NPS 1 to 2

C-Valves

This procedure describes the disassembly
and assembly of the NPS 1, 1.5, and 2 C-Valve
actuator equipped with internal reservoir.
The procedure is grouped into sub-assemblies
to accommodate different assembly
requirements. The fluid should be drained from
the actuator prior to beginning this procedure.

Required tools and equipment

- ⅜ through ¾ combination wrenches

- Slotted screwdriver

7

/

-

16 deep well socket wrench or nut driver

- PTFE tape or suitable hydraulic thread
sealant liquid thread lock

- Dow corning 111 or equal silicone grease

Actuator disassembly C1-2

• See Figure 2.

• Match mark the entire actuator assembly
with a felt marker before disassembly.

• Remove the pneumatic positioner (item 25)
by removing the 6 slotted ¼-20 UNC cap
screws. The positioner is probably stuck to
the gasket and a sharp tap with a soft mallet
should loosen it. The positioner range spring
(item 27) is in compression and care must be
taken to avoid loosing the brass range spring
washer and range spring during positioner
removal.

• Remove the travel indicator tube (item 39)
using only the wrench flats provided.

• Remove the bonnet (item 26), and the
coupling clamp (Item 6). The bonnet is spring
loaded by the return spring (item 3), so hold
the bonnet securely while loosening the
clamp. Remove the bonnet and clamp.

• Remove the air side diaphragm, plunger
assembly, and return spring.

• The hydraulic quad ring seal (item 5) can now
be removed for inspection or replacement.

• Remove the coupling clamp to access the
reservoir area and the two seal O-rings
(items15 and 16).

• Remove the sight plug (item 12) to access
theself-charging check valve (item 11).

• The check valve can now be removed.

Actuator assembly C1-2

• In the following order, insert the ½-20 x ¾
hex cap screw (item 28) through the range
spring locator (item 29), diaphragm retainer
plate (item 30), diaphragm (item 31), piston
(item32), and backup plate (item 33).

Note: the exposed fabric, marked “piston

side”, of the diaphragm should be in
contactwith the piston.

• Apply thread sealant to the ½” screw and
thread it into the tapped hole in the plunger
(item 4), torque to 25 ft·lbs.

• Install the filter/breather plug (item 10) into
¼NPT port on the outside of the actuator
body (item 1).

• Apply thread tape or thread sealer to the
check valve (item 11), and sight plug (item 12).

• Install check valve, with flow arrow pointing
toward the centerline of the actuator body,
into the ⅛ NPT port in the reservoir cavity.

• Install the sight plug in the ⅜ NPT port
directly above the check valve.

• Install the quad ring seal (item 5) into the
machined groove inside the actuator body.
Apply a film of silicone lubricant over the
exposed surface of the quad ring.

• Apply thread tape or sealer to ¼ NPT end of
the hydraulic hose assembly and install it into
the recessed ¼ NPT port on the outside of
theactuator body.

• Apply thread tape or thread sealer to the
reservoir breather (item 18), hand tighten
breather into the ¼ NPT port located on the
outside of the cap (item 17). The breather will
be fully tightened after charging the actuator.

• Install air vent valve (item 19) into the
⅛NPTport.

• Install the pressure gauge (item 20) into
the remaining ¼ NPT port. The top of the
pressure gauge scale should be positioned
toward the air vent.

• Place actuator on a padded flat surface so
that the reservoir cavity is facing upward.

• Place the O-rings (items 15 and 16) in their
respective grooves.

• Position the cap assembly on body so that the
“V” flanges are concentric and the reservoir
breather is opposite (180 degrees) from the
sight plug on the body.

• Install the coupling clamp so that the clamp
screw is in line with the sight plug (item 12)
on the body; tighten screw.

• Place the body assembly on a padded flat
surface with the large machined cavity facing
upward and slide the return spring (item 3)
over boss in the center of the body.

• Roll the diaphragm into a convoluted shape.

• Place the piston/plunger assembly on return
spring so that spring is captured in the
grooveon the underside of the backup plate.

• Place the bonnet (item 26) over the piston,
approximately center the bonnet and rotate it
so that one of the six ¼-20 tapped holes is in
line with the sight plug on the body assembly.
Insure the travel indicator rod is centered on
the SAE port in the bonnet.

• Compress the spring with the stack of
parts so that the plunger passes through
the quad ring seal; assist the convolution
of the diaphragm into the machined
5-½-diameter bore.

• Push the assembly further until the flange
of the diaphragm is sandwiched between
theflanges on the body and the bonnet.

• Accurately center the body and bonnet
flanges and recheck that the tapped hole is
still aligned with the sight plug on the body;

and the travel indicator rod is centered, adjust
as required, install the coupling clamp to the
“V” flange. The coupling clamp screw should
be lined up with and be perpendicular to
the sight plug on the body. Hand tighten the
clamp screw. Recheck bonnet for alignment
with body, adjust as required and fully
tightenclamp screw.

6

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

Actuator mounting procedure NPS 1 to 2
C-Valve

• Apply thread tape to ¼ NPT end of the hose
assembly (item 2). Screw ¼ NPT end of hose
assembly into angled port in the side of the

9

actuator assembly by using a

/

16 open-end

wrench.

• Apply double sided tape or adhesive to the
ends of the curved section of the mounting
brackets (item 9). Place mounting pads
(item8) on corners were the tape wasapplied.

• Pass the 2-¼ long hex cap screws through
mounting brackets, C-Valve body holes and
flat washers. There should be a flat washer
on either side of each bracket leg. Hand
tighten nuts.

• Apply thread tape to 45 degree elbow
(item14) and install the fitting in the
C-Valvebodyport.

• Place actuator assembly on mounting
brackets. The breather vent on the bottom of
the actuator should be between the brackets,
and pointed directly at the centerline of the
actuator. Place band clamps (item 7) around
the actuator and brackets, tighten clamps
so that actuator can still be shifted on the
brackets. Make final adjustments required
to make the actuator and valve body parallel
to each other. Tighten mounting screws and
band clamps.

• Connect hose assembly to the 45 degree
elbow on the valve body. The hose should
liein a flat plane; adjust as required.

• Attach bottom bracket with the 2 inch long
hex screws, nuts, and lock washers to
thevalvebody.

• Apply thread tape to hex nipple. Place dust
cap loop over nipple end and thread the
nipple into the ¼ NPT port on the bottom of
the valve body. Thread the quick disconnect
coupling onto nipple.

• Attach the positioner (item 25) to the end of
the actuator so that the middle ¼ NPT port
is level. Install gauges and fittings (item 21,
22, 23 and 24) as shown on the illustration,
Figure 2.

• Install the travel indicator over the indicator
rod and into the SAE port. Tighten using only
the wrench flats provided.

• See hydraulic charging procedure,
Section2.2.4.2, for charging instructions.
Seeinstallation, Section 2.2.3 for installations.

2.2.4.1.2 Unitized actuator for NPS 3 and 4

C-Valves

Inspect all rubber components before starting
to assemble components. Replace scratched
ortorn components. All hydraulic fluid should
be drained prior to beginning this procedure.

Required tools and equipment

- Screwdriver

9

/

- ⅜,

16, ¾ combination open end-box

endwrenches

3

/

-

16 allen wrench

- Air pressure regulator

- Hydraulic fluid

- Scissors and hand hydraulic charging pump

Actuator disassembly C3-4

• See Figure 3.

• Match mark the entire actuator assembly
with felt marker before disassembly.

• Disconnect the hydraulic hose (item 48) and
catch any leakage in a suitable container.

• Remove the actuator assembly from the
C-Valve body.

• Support the actuator assembly using
the angle bracket (item 43) so that the
positioneris on top.

• Remove the positioner, range spring, and
spring brass washer (items 1 and 15). Take
care not to damage the gasket, or lose the
range spring or brass washer.

• Remove the travel indicator tube (item 12)
using only the wrench flats provided.

• Remove the cap screws (item 13) holding the
upper housing (item 14) to the assembly.

• Loosen the diaphragm (item 21) flange from
the housing flanges, and remove the upper
housing.

• Note and mark the position of the travel
indicator rod (item 18).

• While securely holding the piston rod
(item24) with a ⅜ box wrench, loosen and
remove the hex jam nut and spring locator
(item 16 and 17). Be careful not to twist
thisassembly.

• Remove the retainer plate, diaphragm, piston,
and back-up plate (items 20, 21, 22 and 23).

• Loosen and remove the six hex socket cap
screws (item 40) from the bottom side of
thelower housing (item 36), and remove the
entire hydraulic cylinder/piston assembly
from the lower housing.

• Remove the remaining hex jam nut (item 16).
The remaining hydraulic side components
can now be separated.

Actuator assembly C3-4

• Place the hydraulic diaphragm (item 29) with
the rubber side out (fabric side should be
identified as “piston side” and placed against
the piston) and slip it over hydraulic piston
(item 26). Align the holes in the piston and
diaphragm.

• Place the back-up plate (item 25) over
threaded piston rod (item 24), on the end
opposite the hexagonal wrench flats.

• Push the hydraulic piston with diaphragm
onto the threaded piston rod and over the
back-up plate.

• Slip the O-ring (item 31) over piston rod
andagainst diaphragm.

• Slip retainer plate (item 30) onto piston rod.

• Install the seal washer (item 32) over the
guide rod with the tapered side against the
O-ring and the shoulder inserted into the
holein the retainer plate.

• Carefully apply a small amount of thread
anti-seize to one end and inside one of
thejam nuts (item 16).

Screw the jam nut finger tight onto piston rod.

7

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

• Place exposed end of piston rod in a vise with
soft protective insulator between the jaws and
the piston rod.

• Tighten jam nut to 75 in·lb. torque.

• Roll the diaphragm back on itself, with
theflange side out.

• Tuck the diaphragm into the hydraulic
cylinder (item 28), mating flange-to-flange.
Line up flange holes.

• Place lower housing (item 36) on a flat
surface, flange side up.

• Insert guide rod (item 33) into lower housing,
apply a liquid thread lock, and tighten as
necessary.

• For a NPS 3 C-Valve application only, slip the

1.75 inch long travel limit (item 34) over guide
rod.

• Insert hydraulic O-ring (item 35) into the
groove in the lower housing.

• Place the complete hydraulic assembly over
the guide rod, pushing hydraulic cylinder
downward.

• Line up the flange holes and make sure the
hydraulic cylinder is seated into the pilot
boreof the lower housing.

• Slip reinforcing ring (item 27) over the
hydraulic cylinder while lining up flange
holes.

• Insert socket-head cap screws (item 40) from
the bottom of the lower housing and into the
threaded reinforcing ring, finger tight. Tighten
in increments, working from side-to-side,
rotating in a circle until all screws are
torqued to 120 in·lb.

piston and the hydraulic cylinder to see that
the diaphragm convolution is intact and
uniform all the way around the annulus.
If not, disassemble and repeat the above
procedures. Special care should be taken not
to raise piston rod any more than necessary
from this point in the assembly procedure
onward, as this would likely upset the
convolution. Disassemble and repeat the
above procedures if the piston rod can be
seen to rotate while moving away from the
lower housing, indicating that the convolution
has been lost or twisted.

• Place the air side back-up plate (item 23)
overexposed piston rod.

• Place air diaphragm and air piston (items 21
and 22), with the fabric side of the diaphragm
against the piston, over piston rod, carefully
tucking the diaphragm inside the lower
housing. Use a thin but smooth rounded piece
of metal or plastic (tongue depressor) until
the diaphragm flange mates with the lower
housing flange.

• Slip retainer plate (item 20) and spring
locator(item 17) over piston rod.

• Carefully apply a small amount of thread
anti-seize to one end and inside one of the
jam nuts. Screw the jam nut onto piston
rodfinger tight.

• Align the travel indicator rod in the same
position as originally found on disassembly.

• Restrain the piston rod ⅜ hex end from
rotating using a box-end wrench with one
hand while using the other to tighten jam
nutto 75 in·lb.

NOTE

Take special care not to rotate piston rod and thus
put a twist into the hydraulic diaphragm. This is

extremely important.

If twisting is suspected, disassemble and
repeatthe above procedures.

•Place upper housing (item 14) onto lower
housing, lining up flange holes and the
travelindicator.

•Insert cap screws (item 13) into flange holes
and tighten finger tight.

• Tighten in increments working from
side-to-side, rotating in a circle until all
screws are torqued to 75 in·lb.

• Install the travel indicator support tube
usingonly the wrench flats provided.

• Pressurize hydraulic end to 150 psi for
5minutes to verify that there are no leaks.
If the pressure doesn’t hold, disassemble,
inspect and replace any faulty components
and re-assemble.

• Mount the actuator to C-Valve, connect
hydraulic hose (item 48). Install to
the assembly positioner (item 10)
with spring washer and range spring.
Charge and calibrate per instructions.
(SeeSection2.2.4.2and 2.2.3.1).• Inspect the area between the hydraulic

2.2.4.1.3 Unitized actuator for NPS 6 and 8

C-Valves

Inspect all rubber components before starting
to assemble components. Replace scratched
ortorn components.

Required tools and equipment

- Screwdriver

- ⅜ through ¾ combination open end-box end
wrenches

3

5

/

16 and

/

16 allen wrench

-

- 1⅛ deep socket with ratchet handle

- Air pressure regulator

- Liquid thread lock

- Hydraulic fluid

- Scissors and hand operated hydraulic
charging pump

Actuator disassembly C6-8

• See Figure 4.

• Disconnect the hydraulic hose (item 61)
from the C-Valve and catch any leakage
inasuitable container.

• Remove the actuator assembly from the
C-Valve body.

• Support the actuator assembly using the
angle brackets (item 63) with the positioner
on the top.

• Match mark the entire actuator assembly
with a felt marker before disassembly.

• Remove the air tubing between the positioner
(item 43) and the upper housing (item 1).

• Remove the range spring guard (item 51).

• Remove the cap screw (item 55) from the
positioner rod (item 17), and remove the
positioner complete with range spring
(items43 and 52).

• Remove all the cap screws securing
theupper housing to the assembly.

• Carefully loosen the air diaphragm (item 12)
flange from the housing flanges and remove
the upper housing.

8

CLARKSON C-VALVE SLURRY CONTROL VALVES

INSTALLATION, MAINTENANCE AND OPERATING INSTRUCTIONS

• While supporting the internal piston
assembly, remove the slotted round head cap
screws (item 39) from the opposite end of the
assembly.

• Remove the entire piston assembly from the
piston case by pulling out from the open end.

• Place the hydraulic end of the casting
(item 36) on a flat surface or table with
thediaphragm end facing up.

• While securely holding the air side retainer
plate (item 11), loosen and remove the hex
jam nut (item 8), washer, (item 9) travel limit
(item 10) and the O-ring (item 31) if installed.

• Remove the retainer plate, diaphragm,
airpiston (item 13), back-up plate (item 16),
and spreader tube (item 22).

• Loosen and remove the ten hex socket
cap screws (item 25) from the clamp ring
(item27) and remove the ring.

• Remove the large O-ring (item 35).

• Loosen the diaphragm gasket and remove
thepiston assembly from the hydraulic end
ofthe casting.

• Remove the remaining hex jam nuts and the
remaining hydraulic side components can
now be separated.

Actuator assembly C6-8

• Install the threaded clamp collar (item 21)
onto the guide tube (item 20). Turn the clamp
away from the hollow end of the guide tube
until it seats against the square shoulder and
tighten the cap screws to 120 in·lb torque.

• Install the hydraulic end backup plate
(item23) onto the guide tube with the
groovedend toward the clamp collar.

• Place the piston (item 24) over the backup
plate and onto the guide tube.

• Place the hydraulic diaphragm (item 29) with
the rubber side out, (fabric side should be
identified as “piston side” and placed against
the piston) slip it over hydraulic piston and
onto the guide tube.

• Place the O-ring (item 31), the retainer plate
(item 30) and the seal washer (item 32) onto
the guide tube and against the diaphragm.
Carefully apply a small amount of thread
anti-seize to one end and inside of one of the
jam nuts. Screw the jam nut (item 8) onto
guide tube and tighten the nut to 150 in·lb.
Torque.

• Roll the diaphragm back on itself, with the
flange side out.

• Tuck the diaphragm into hydraulic cylinder
(item 28), mating flange-to-flange. Take
care to insure the diaphragm forms a
properconvolution roll with no wrinkles.

• Place the hydraulic end casting (item 36)
onaflat surface or table with the open
endfacing up.

• Insert guide rod (item 33) into hydraulic end,
apply a liquid thread lock and tighten as
necessary.

• For a NPS 6 C-Valve application only, slip the
travel limit tube (item 34) over guide rod.

• Insert the O-ring (item 35) into the groove
provided inside the hydraulic end.

• Place the just completed hydraulic piston
assembly over the guide rod, lowering the
assembly down onto the machined cast
surface along with the O-ring. Insure the
hydraulic cylinder and diaphragm flanges
seat into the casting. It may be necessary to
trim the diaphragm flange to insure seating.
Adjust the assembly as necessary to insure
concentricity between the hydraulic cylinder
and hydraulic piston.

• Place the clamp ring (item 27) over the
hydraulic cylinder and lower into the cylinder.

• Install the cap screws and lock washers
(items 25 and 26) to secure the clamp ring
and tighten in a cross pattern until all are
torqued to 120 in·lb.

• Place the spreader tube (item 22) over the
guide tube and into the groove provided in
thebackup plate.

• Inspect the area between the hydraulic
piston and the hydraulic cylinder to see that
the diaphragm convolution is intact and
uniform all the way around the annulus.
If not, disassemble and repeat the above
procedures. Take special care not to raise
piston rod any more than necessary from
this point in the assembly procedure onward,
as this would likely upset the convolution.
Disassemble and repeat the above
procedures if the piston can be seen to rotate
while moving away from the lower housing,
indicating that the convolution has been lost
or wrinkled.

• Insert the positioner actuating rod (item 17)
with nut and lock washer into the backup
plate (item 16) on the side with the roll pins.
The end of the rod should just be flush with
the top surface of the plate. Tighten the nut
securely.

• Place the back-up plate over the guide tube
with the three roll pins inside the spreader
tube for alignment. The positioner actuating
rod will fit through a groove provided in the
hydraulic end flange.

• Place air piston (item 13), with the guide
shoes installed and air diaphragm (item 12)
over the piston rod. Be sure the fabric side
ofthe diaphragm contacts the piston.

• Slip retainer plate (item 11), O-ring (item 31),
travel limit (item 10) and flat washer (item 9)
over piston rod.

• Carefully apply a small amount of thread
anti-seize to one end and inside of one of the
jam nut. Screw the jam nut finger tight onto
piston rod.

• Restrain piston assembly with one hand while
using the other to tighten jam nut to 75 in·lb.
of torque.

NOTE

Take special care not to rotate piston rod and thus
put a twist into the hydraulic diaphragm. This is

extremely important.

9