User guide

ManualsBrandsCashco ManualsAccessories for waterSCV-S

INSTALLATION, OPERATION & MAINTENANCE MANUAL (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

ﬁ nish.

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.

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

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

Straight Body Pattern

with ATC - FO Actuator

IOM-SCV-S

12-13

MODEL SCV-S

GLOBE-STYLE - SANITARY

PNEUMATIC CONTROL VALVE

BODY IOM

SECTION II

Summary of content (12 pages)

PAGE 1
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-SCV-S 12-13 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 control valve for throttling sanitary or biotechnological applications. 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.
PAGE 2
SECTION III III. OPERATION CONSIDERATIONS B. Steam-in-Place (SIP): 1. Orientation to be same as CIP,Section III.A.1. A. Clean-in-Place (CIP): 2. Steam may flow from either direction. 1. Control valve unit must be properly oriented per Section IV.A. to assure self-draining of valve’s internal passages. 2. Control valve unit comes in the direct action, ATC-FO arrangement or the reverse action, ATO-FC arrangement. Valve should be in the full open position before initiation of the CIP procedure.
PAGE 3
SECTION V V. MAINTENANCE 8. Hereafter, whenever text has the following notation, “(Note RP.)”, the following text is to be applied: A. General: WARNING SYSTEM UNDER PRESSURE. Prior to performing any body disassembly or removal for maintenance, inspection or cleaning, isolate the valve body from the system and relieve all pressure. Failure to do so could result in personal injury. 1.
PAGE 4
from the plug/stem (3), while holding the actuator stem (6). Record the number of plug/stem revolutions for Step A above. When the disengagement reaches about 50% of full stroke travel Step A is completed. (Note RP). c. Step B. Support the actuator assembly (AA) from above. Fully loosen yoke nut (8). Lift the actuator assembly (AA) upwards approximately 1/4"-3/8" (6-8 mm).
PAGE 5
6. Release temporary air pressure. 7. Lift actuator assembly (AA) upwards until able to swing out of the way and set down onto work surface. D. Body Disassembly: 1. Remove actuator assembly (AA) per Section V.B.1-6 or V.C.1-7. 2. Remove clamp nuts (4.3), washers (4.4), bolts (4.2), and clamps (4.1). 4.2 4.3 2. Pick up bonnet (2) and using a thin-edged tool, remove both upper and lower stem seal rings (9) and discard used seal rings. 3. Clean all parts per owner’s procedures.
PAGE 6
with bonnet (2) by checking OD of flanges. Finger-tighten clamp nuts (4.3). NOTE: Gap between clamp (4.1) halves should be equal in size. See Figure 3. 7. Wrench-tighten each clamp nut (4.3) in alternate one-half revolution increments. Final tighten clamp bolting (4.2)(4.3) to a 20 Ft-lbs (27 N-m) torque value. 8. Tighten yoke nut (8) to 85 ft-# (115 N-M). 8. Reinstall actuator assembly (AA) to body assembly (BA) per Section V.G. or V.H. H. Mounting - Actuator to Body Opt-68 QDS: G.
PAGE 7
SECTION VI VI. CALIBRATION A. General: 1. This section only covers calibration of the control valve with Actuator Model C27-C53. 2. Positioner, if installed, requires reference to the specific positioner model IOM for proper calibration procedure. 3. All indicated items numbers that are with respect to IOM-C27-C53 will be in parenthesis and underscored; i.e. (20); those that reference the positioner IOM will be in double paranthesis; i.e. ((AP)).
PAGE 8
(16) to the "C" mark on the indicator plate (23), making sure to use the “top edge” of the indicating washer (16) as the reference point. Adjust indicator plate as needed. 10. Slowly increase the pressure in the actuator until the indicating washer (16) is in alignment with the "O" mark on the indicator plate. 11. To limit the up travel at the desired stroke length, rotate the travel stop nut (52) CW and secure to bottom of attachment hub (4).
PAGE 9
d. Rotate upper jam nut CW to hold indicator washer (16) up against stem (6). e. Release all pressure from the actuator and repeat Step 4 previous. 7. After the closed- set point pressure has been established, rotate lower jam nut (17) CW up tight under the upper jam nut. 8. Increase pressure in the actuator to the upper pressure level of the bench setting. 9.
PAGE 10
SECTION VII VII. TROUBLE SHOOTING GUIDE 1. Unit can not pass enough flow. Possible Cause A. Sizing data not correct; valve undersized. B. C. Obstruction at inlet. Insufficient valve travel. Remedy A1. Check actual pressures, temperature, and flow rates against the variables used for sizing. Recalculate Cv Required. A2. Replace unit with larger body size. B. Remove valve and inspect line for blockage. C1. Verify full travel. C2. Verify correct IAS pressure. 2.
PAGE 11
6. Unit will not operate. Possible Cause A. B. C. D. Remedy IAS is “off”. Faulty positioner. Improper positioner action. Actuator has a leak. A. B. C. D. Turn “on” the IAS and set at proper level. Service positioner or replace. Switch positioner to proper action unit. Manually load actuator to test for pressure integrity. Replace diaphragm and O-ring if either is leaking. 7. Instability. Possible Cause Remedy A. Insufficient dampening. A. Recalibrate and set dampening adjustment of positioner. B.
PAGE 12
OPT-68 Detail A FIGURE 4: Straight-Globe Body Assembly (BA), Metal Seat ITEM NO. 1 2 3 4 7 8 9 10 11 12 13 14 15 16 17 Figure 6: Composition seat with OPT-68 Quick Disconnect REPLACEMENT DESCRIPTION PARTS Body Bonnet Stem/Metal Plug * “Tri-Clover” Clamp Gasket * Yoke Nut Seal Rings (2 req'd.) * Stem/Composition Seat * Gasket * Seat Nut * Seat Disc * Pin * Plug * Indicating Washer Stem Jam Nuts ITEMS NOT SHOWN ITEM NO. 5 6 42 Cashco, Inc. P.O. Box 6 Ellsworth, KS 67439-0006 PH (785) 472-4461 Fax.