Cashco SCV-S User Manual
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL SCV-S
GLOBE-STYLE - SANITARY
PNEUMATIC CONTROL VALVE
BODY IOM
SECTION I
I. DESCRIPTION AND SCOPE
Model SCV-S 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 Tri-Clover®
sanitary end connections. The valve is available in
either a metal or composition seat construction. The
wetted metallic body portion is of forged 316L SST
mechanically and electro-polished to a 10 micro-inch
Ra fi nish.
IOM-SCV-S
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 standard actuator stem-to-valve stem connection
is a screwed joint design; Opt.-68 Quick Disconnect
Joint is also available.
SECTION II
II. REFERENCE
Refer to Technical Bulletin SCV-S-TB for complete
tech ni cal specifi cations.
www.cashco.com/techbulletins/scvs.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-S:
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 ATC - FO 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
III. OPERATION CONSIDERATIONS
SECTION III
B. Steam-in-Place (SIP):
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 50
psig (3.4 Barg).
5. Cleaning fl uid temperature must not exceed
366°F (186°C).
6. Cleaning fl uid must be compatible with wetted
ma te ri als.
1. Orientation to be same as CIP,Section III.A.1.
2. Steam may fl ow from either direction.
3. Recommended 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-S 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-S 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 valve 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. 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. See
Figure 1.
SECTION IV
Straight Pattern
HORIZONTAL
OUTLET
VERTICAL DOWN
OUTLET
Angle Pattern
Figure 1: Installation Orientation
2
IOM-SCV-S
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 6 for iden ti fi ca-
tion of item numbers.
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) and
positioner will be in parenthesis and un der scored; i.e. (3). Reference with respect to
the po si tion er is in double parentheses; i.e.
((AP)).
6. Special care must be exhibited when ro-
tat ing the stem (3,10) of the valve to not
mar that portion of the surface of the stem
where it contacts with the seal o-rings (9).
To rotate the stem (3,10), use the jam nuts (17)
or grasp stem with soft-jawed pliers. NOTE:
When using the jam nuts to rotate the stem,
use the upper jam nut to rotate the stem CW,
and the lower jam nut to rotate the stem CCW,
when viewed from above valve stem.
7. Hereafter, whenever text has the fol low ing
no ta tion, “(Note PA.)”, the fol low ing text is
to be ap plied;
8. Hereafter, whenever text has the fol low ing
no ta tion, “(Note RP.)”, the fol low ing text is to
be applied:
“For ATO-FC reverse action units, re lease
all tem po rary air pressure.
B. Separation of Body/Actuator with Std Threaded
Stem:
NOTE: For units with Opt-68 Quick Dis con nect
Stem proceed to Section V.C. See Fig. 2.
1. Secure body (1) into a vise with the actuator
as sem bly (AA) in the upwards orientation.
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.
2. Using an overhead hoist, rig the actuator as sem bly (AA) for a vertical lift. Remove slack
from rigging.
3. (Note PA.) Rotate yoke nut (8), CCW (viewed
from above) ap prox i mate ly 2 rev o lu tions. Secure the ac tu a tor stem (6). Loose jam nuts
(17) by rotating CW one-at-a-time to base of
stem (3) threads.
4. Fully loosen any accessory devices that are
connected to the stem (3,6) such as accessory
plate ((AP)) for positioner. (Note RP.)
NOTE: To fully disengage actuator stem (6)
from the stem (3) is a two-step pro ce dure.
Be aware of the valve’s stroke length as in di cat ed on the name plate (40) before be gin ning
dis en gage ment. During the dis en gage ment,
mea sure the dis tance ex tend ed, and stay at
least 1/8" (3 mm) away from the full stroke
length. Count and record the number of
rev o lu tions for each step in the box below:
No. of revolutions to disengage plug/stem from
actuator stem:
Step A. Step B.
TOTAL:
5. For ATO-FC Reverse Action Units:
IOM-SCV-S
“For ATO-FC reverse action units, connect
a temporary air source to the actuator and
pres sur ize to a level suf fi cient to initiate
travel to ap prox i mate ly mid-stroke.
a. (Note PA.)
b. Step A. Rotate stem (3) CW (viewed from
above) to disengage the ac tu a tor stem (6)
3
from the plug/stem (3), while holding the
actuator stem (6). Record the num ber of
plug/stem rev o lu tions for Step A above.
When the dis en gage ment reach es about
50% of full stroke trav el Step A is com plet ed. (Note RP).
cau tious ly to prevent dan gling parts –
indicating washer (16), ac ces so ry plate
((AP)), yoke nut (8) - from falling.
C. Separation of Body/Actuator with Opt-68 Quick
Disconnect Stem:
c. Step B. Support the actuator as sem-
bly (AA) from above. Fully loosen
yoke nut (8). Lift the actuator as sem bly (AA) up wards ap prox i mate ly
1/4"-3/8" (6-8 mm). Again, rotate plug/
stem (3) CW (viewed from above) to
dis en gage the ac tu a tor stem (6) from the
plug/stem (3) while holding the ac tu a tor
stem (6). Record the number of plug/stem
rev o lu tions for Step B above. This should
allow the stems (6) (3) to fully dis en gage.
NOTE: Take notice of the parts “dan gling
loosely” about the stem (3), the order of their
lo ca tion and their proper orientation.
d. Fully raise the actuator assembly (AA)
from the valve body assembly (BA).
Re move cautiously to prevent dan gling
parts - indicating washer (16), ac ces so ry
plate ((AP)), yoke nut (8) - from fall ing.
6. For ATC-FO Direct Action Units:
a. Step A. Rotate plug/stem (3) CW (viewed
from above) to disengage the ac tu a tor
stem (6). Do not rotate the plug (3) into
the seat (11). Record the number of
stem (3) rev o lu tions for Step A. When
the dis en gage ment reach es about 75%
of full stroke travel, Step A. is com plet ed.
1. Place body assembly (BA) into a vise with
the actuator as sem bly (AA) in the upwards
position.
2. Place matchmarks between the yoke (3),
®
bonnet (2), Tri-Clamp
(4), and body (1) to
assist during re-assembly.
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), (turning CCW viewed
from above actuator) until fully dis-engaged.
For ATO-FC (Reverse) Action Units Only:
Connect a temporary air supply hose that has an
ad just able airset with gauge to the ac tu a tor inlet
to allow pres sur iza tion. Pressurize the actuator
to upper limit of the bench range specifi ed on the
name plate (40). (NOTE: Pressure will lift the plug/
stem (10) away from the body's (1) integral seat
until the plug is 100% open.).
16
17
42a
b. Step B. Support the actuator as sem bly
(AA) from above. Fully loosen yoke nut
(8) and remove. Lift the actuator as sem bly (AA) upwards ap prox i
mate ly 1/4" 3/8" (6-8 mm). Again, rotate plug/stem
(3) CW (viewed from above) to dis en gage
42b
10
the ac tu a tor stem (6) from the plug/stem,
while holding the actuator stem. Record
the number of plug/stem rev o lu tions for
Step B. This should allow the stems (6)
(3) to fully disengage.
5. The valve stem (10)-to-actuator stem (6)
Figure 2: Opt.-68 Quick Disconnect
assembly is a quick disconnect joint. Grasp
stem (10) between thumb and fore fi n ger of one
hand. Grasp the lower collar (42b) between
NOTE: Take notice of the parts “dangling
loosely” about the stem (3), the order of their
lo ca tion and their proper orientation.
the thumb and fore fi n ger of the other hand.
Slide/push lower collar (42b) upwards. Stems
(10) and (6) should uncouple and separate.
NOTE: Take care to not “drop” the plug/stem
c. Fully raise actuator assembly (AA) from
the valve body assembly (BA). Re move
4
(10) down wards into the body’s (1) integral seat;
lower slow ly to this po si tion.
IOM-SCV-S
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