Cashco SCV-30 User Manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)

MODEL SCV-30

GLOBE-STYLE - SANITARY

PNEUMATIC CONTROL VALVE

BODY IOM

SECTION I

I. DESCRIPTION AND SCOPE

Model SCV-30 is a pneumatically actuated, globe-style
con trol valve for throttling sanitary or biotechnological
ap pli ca tions. The globe body comes in two varia­tions; straight-globe pattern and angle-globe pattern,
sizes 3/4" - 1-1/2" (DN20 - DN40) with standard Tri­Clover® sanitary end connections. The valve body
assembly incorporates a formed internal composition
diaphragm that is bonded to a characterized metal
plug. The wetted metallic body portion is of forged
316L SST, mechanically and electro-polished to a 10
micro-inch Ra fi nish.

IOM-SCV-30

12-13

A fi eld reversible actuator, Model C27, is mounted
to the body.
Failure position is determined by actuator, for:
"D" = Direct action; on increasing air loading pressure,
the actuator stem extends. Fail-safe position is with
the stem retracted.

"R" = Reverse action; on increasing air loading pres-

sure, the actuator stem retracts. Fail-safe position is
with the stem extended.

The actuator stem-to-valve stem connection is a Quick
Disconnect joint.

SECTION II

II. REFERENCE

Refer to Technical Bulletin SCV-30-TB for complete
tech ni cal specifi cations.
www.cashco.com/techbulletins/scv30.pdf

Refer to following Installation, Operation & Main te­ nance Manuals (IOM’s) for the actuator and/or devices
that maybe mounted to a Model SCV-30:

Actuators: www.cashco.com/IOM/C27-C53.pdf
Positioners:
P/P: www.cashco.com/techbulletins/9540l.pdf
I/P: www.cashco.com/techbulletins/srd991.pdf
I/P: www.cashco.com/iom/PS2iom.pdf

Straight Body Pattern

with ATO - FC Actuator

ABBREVIATIONS

ATC-FO - Air to Close, Fail Open
ATO-FC - Air to Open, Fail Close
CCW - Counter-Clockwise
CIP - Clean-in-Place
CW - Clockwise
DIR - Direct Acting
IAS - Instrument Air Supply
REV - Reverse Acting
SIG - Output Signal from Instrument
SIP - Steam-in-Place
V - Vent

SECTION III

III. OPERATION CONSIDERATIONS

A. Clean-in-Place (CIP):

1. Control valve unit must be properly oriented
per Sec tion IV.A. to assure self-draining of
valve’s internal pas sag es.

2. Control valve unit comes in the direct action,
ATC-FO arrangement or the reverse action,
ATO-FC ar range ment. Valve should be in
the full open po si tion before initiation of the
CIP pro ce dure. Control system must ac com­ mo date this ca pa bil i ty.

3. Cleaning fl uid may fl ow in either direction.

4. Cleaning fl uid pressure must not exceed 60
psig (4.1 Barg).

5. Cleaning fl uid temperature must not exceed
300°F (149°C).

6. Cleaning fl uid must be compatible with wetted
ma te ri als.

B. Steam-in-Place (SIP):

1. Orientation to be same as CIP,Section III.A.1.

2. Steam may fl ow from either direction.

3. Recommended 20 psig @ SAT (1.4 Barg @
SAT). Maximum 30 psig @ SAT (2.1 Barg
@ SAT).Valve must be in the full open during
the SIP pro ce dure.

C. Hose-Down Cleaning:

1. Standard Model SCV-30 control valve units
supplied with I/P positioners are NOT de signed
to allow hose-down wash ing of the unit’s ex­ te ri or.

D. Instrument Air Supply - IAS:

1. For Model SCV-30 with a positioner rec om­ mend using cryogenically pro duced nitrogen
gas, or oil-free com pressed air des ic cant
dried to -40°F(-40°C) dew point, fi l tered to 10
mi crons or less as the IAS source.

2. All exhaust/vent air utilized by the Model
SCV-S unit enters the ambient en vi ron ment.

IV. INSTALLATION

A. Orientation:

1. Standard orientation is with the yoke with
position indicator plate and valve body outlet
port in same plane. If an alternate ar range­ ment is necessary, loosen yoke nut (8)
se cur ing yoke (3) to bonnet (2) ap prox i mate ly
three revolutions. Rotate actuator assembly
(AA) to de sired po si tion with re spect to body
as sem bly (BA). Re-tighten yoke nut (8) to 85
ft-# (115 N M). NOTE: This pro ce dure can

be done in-line.

2. Valve body must be installed in a horizontal
or vertical plane where the outlet connection
fl ow direction is down wards or horizontal (see
Figure 1). Failure to comply will cause the
self-draining of the internal passages to be
nullifi ed, allowing CIP clean ing/fl ushing fl uids
to be ponded.

SECTION IV

Straight Pattern

HORIZONTAL

OUTLET

VERTICAL DOWN

OUTLET

Figure 1: Installation Orientation

Angle Pattern

IOM-SCV-302

SECTION V

V. MAINTENANCE

A. General:

WARNING

SYSTEM UNDER PRESSURE. Prior to per form ing any
body disassembly or removal for maintenance, in spec­ tion or cleaning, isolate the valve body from the system
and relieve all pressure. Failure to do so could result in

personal injury.

1. Maintenance procedures hereinafter are
based upon removal of the control valve unit
from the piping system where installed.

2. Owner should refer to their pro ce dures for re­ mov al, handling and cleaning of non-re us able
parts, i.e. gaskets, diaphragm, etc.

3. Valves supplied from the factory use a light
coat of Emhart Bostic White Food Grade
"NEVER_SEEZ" or equivalent on seals and
threads.

4. Reference Figures 2 through 5 for iden ti fi ca-
tion of item numbers.

(3.1) away from the body's (1) integral seat until
the plug is 100% open.).

For ATC-FO Direct Action Units:

Not necessary to connect temporary air supply.

5. The valve plug/stem (3) -to-actuator stem (6)
assembly is a quick disconnect joint. Grasp
stem (3.1) between thumb and fore fi n ger of one
hand. Grasp the lower collar (42b) between
the thumb and fore fi n ger of the other hand.
Slide/push lower collar (42b) upwards. Stems
(3.1) and (6) should uncouple and separate.

NOTE: Take care to not “drop” the plug/stem (3.1)
down wards into the body’s (1) integral seat; lower
slow ly to this po si tion.

16

17

42a

5. All item numbers with respect to body as­ sem bly (BA) will be in parenthesis and not
un der scored; i.e. (1). All item numbers with
respect to the actuator assembly (AA) will be
in parenthesis and un der scored; i.e. (1).

B. Separation of Body/Actuator:

1. Place body assembly (BA) into a vise with
actuator as sem bly (AA) in upwards position.

2. Place matchmarks between the yoke (3),
bonnet (2), Tri-Clamp® (4), and body (1) to
assist in fi nal ori en ta tion when the body is
dis as sem bled and/or the actuator removed.

3. Using an overhead hoist, rig the actuator as­ sem bly (AA) for a vertical lift. Remove slack
from rigging.

4. Rotate yoke nut (8), CCW until fully dis­engaged.

For ATO-FC Reverse Action Units:

Connect a temporary air supply hose that has an
ad just able airset with gauge to the ac tu a tor and
pres sur ize to a level suffi cient to initate travel to
upper limit of the bench range specifi ed on the
name plate (40). (Pressure will lift the plug/stem

42b

3.1

Figure 2: Quick Disconnect

6. Raise the actuator assembly (AA) over stem
(3.1).

For ATO-FC Reverse Action Units:

Release all pressure from the actuator. Lay actua­tor assemby aside on work surface.

C. Body Disassembly:

1. Remove actuator assembly (AA) per Sec tion
V.B.1-6.

2. Grasp wing nut (4.2) with hand and rotate CCW
until there is suffi cient room to swing the nut
away from the restraining slot of clamp (4).

3. Hold plug/stem (3.1) securely, pull up wards,
lifting bonnet (2) and plug/diaphragm sub­assembly away from body (1). It is nec es sary
to grasp the protruding "tab" on the di a phragm
(3.2) and pull upwards si mul ta neous ly with the
plug/diaphragm sub-as sem bly (3).

IOM-SCV-30

3

4. Slide bonnet (2) up over end of plug/stem
(3.1) and set aside.

5. Place plug/stem end (3.1) into a soft-jawed
vise with plug head-end oriented upwards.

D. Trim Inspection and Replacement:

1. Inspect body (1), bonnet (2) and plug/dia­phragm (3) for wear. If seating surfaces show
wear, perform the following re pairs:

NOTE: Observe the contours of the di a phragm
(3.2) to confi rm that it will fi t over the contour of
the plug head-end end (3.1).

6. Clean body (1) similar to plug/stem (3.1) of
Step 4. above. Place body (1) back into vise.

7. Place stem end of plug/stem (3.1) into a
soft jawed vise with the plug head-end (3.1)
ori ent ed upwards. DO NOT TOUCH PLUG­HEAD END (3.1).

2. Pull diaphragm (3.2) away from plug/stem
(3.1). Discard used diaphragm (3.2).

3. Using palm of hand, rub away any adhesive
(3.3) that remains “stuck” onto the plug (3.1).

4. Remove the plug/stem (3.1) and thoroughly
clean the area where adhesive is to be
reapplied (abraded surface) with a water
sol u ble solvent. Rinse thoroughly with warm
potable water. Allow to air dry.

CAUTION

Owner’s cleaning solution must be com pat i ble with control
valve’s trim ma te ri als.

5. Lightly roughen the inside surface of a new
plug/di a phragm (3.2), where the adhesive (3.3)
will be applied, using a “Scotch-Brite” (TM of
3M), or equal polishing pad. Rinse throughly
with warm water and allow to air dry.

8. Open the small container of silicone seal­ant/adhesive (3.3). Place seven “dabs” of
ad he sive (3.3) on the plug head-end (3.1)
at the locations indicated in Figure 3. DO
NOT ATTEMPT TO SPREAD THE DABS.
Place a new diaphragm (3.2) over the plug
head-end (3.1). Press down on the tip of the
diaphragm (3.2) to spread the sil i cone sealant
(3.3). Twist the diaphragm (3.2) back and
forth several times while ensuring at least one
com plete revolution of the di a phragm (3.2)
oc curs. Starting at the tip of the di a phragm
(3.2), press the diaphragm (3.2) against the
plug head-end (3.1) to re move any air pock ets.

9. Grasping the outer edge of the diaphragm
(3.2), lift off the diaphragm (3.2).

10. Examine the plug head-end (3.1) to ensure
that the adhesive (3.3) is evenly spread and
that all surfaces are covered. DO NOT TOUCH

ADHESIVE (3.3).

NOTE: If there are surfaces missing adhesive

(3.3), repeat the last half of Step 8. above,
and Steps 9. and 10.

CAUTION

DO NOT TEAR DIAPHRAGM FABRIC.

Figure 3: Adhesive Placement

11. Place diaphragm (3.2) back over the plug
head-end (3.1). Twist 1/4 revolution. Press
the diaphragm (3.2) against the plug head­end (3.1) to remove any air pockets, starting
from the tip of the diaphragm (3.2) and moving
downwards.

12. Place plug/diaphragm sub-assembly (3) back
into the body (1) with the stem (3.1) oriented
upwards, and the plug head-end (3.1) resting
on the seat portion of the body (1). Place a
temporary 6# (3kg) weight (doughnut shaped)
over the end of the stem (3.1) so that it can
rest on the “shelf” of the plug (3.1), pressing
the diaphragm (3.2) against the plug (3.1) at
the seating surfaces. Leave this apparatus in
place for a 24 hour cure period. NOTE: The

silicone sealant/adhesive (3.3) cure period
can not be shortened through the use of heat;
minimum cure time is 24 hours.

IOM-SCV-304