Cashco 988-MB Manuel d'utilisateur télécharger pdf

I. DESCRIPTION AND SCOPE

Model 988’s and 989’s are pneumatically actuated, globe-

style control valves. Sizes are 3/4", 1", 1-1/2" and 2". Ma-

te ri als are available in cast carbon steel, Grade WCB (CS);

cast 316L SST, Grade CF3M (SST); and cast CW-12MW,

sim i lar to Hastelloy C (H-C).

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 pressure, the

actuator stem retracts. Fail-safe position is with the stem

extended.

These valves are designed for chemical service and most

com mon liquid, gaseous, or steam services.

Models 988 and 989 differ only in the face-to-face di men -

sions of ﬂ anged units; 988’s have a “regular” (“long”) body

pattern, and the 989’s have a “short” body pattern.

INSTALLATION, OPERATION & MAIN TE NANCE MANUAL (IOM)

IOM-988/989

12-13

MODELS 988 and 989

GLOBE-STYLE PNEUMATIC CONTROL VALVE BODY

SECTION I

SECTION II

II. REFERENCE

Refer to Technical Bulletin 988-TB or 989-TB for complete

tech ni cal speciﬁ cations coupled with either Cashco Actuator

Model C27 or C53.

www.cashco.com/techbulletins/988.pdf

www.cashco.com/techbulletins/989.pdf

Refer to following Installation, Operation & Main te nance

Manuals (IOM’s) for either actuator and/or devices that

maybe mounted to a Model 988 or 989:

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

ATO-FC ............. Air-to-Open, Fail Closed

ATC-FO ............. Air-to-Close, Fail Open

CCW .................. Counter Clockwise

CW ..................... Clockwise

D or DIR ............. Direct Acting

HC ..................... Cast CW-12MW or Wrought Hast C-22

IAS ..................... Instrument Air Supply

LOAD ................. Positioner Output Air Pressure

R or REV ........... Reverse Acting

SIG .................... Output Signal from Instrument

SST.................... Cast or Wrought 316L Stainless Steel

V ........................ Vent

Model 988

with ATC - FO Actuator

Shown with Internal Live-Loaded Packing

1 2 3 4 5 6 ... 19 20

Résumé du contenu

Page 1 - MODELS 988 and 989

I. DESCRIPTION AND SCOPEModel 988’s and 989’s are pneumatically actuated, globe-style control valves. Sizes are 3/4", 1", 1-1/2" and 2

Page 2 - SECTION III

10IOM-988/989-BODYf. Wrench-tighten the packing stud nuts (15) evenly and in 1/2 rev o lu tion increments until the “up per groove on the packing fol

Page 3 - SECTION IV

11IOM-988/989-BODYb. Using a sharp, hooked-end, pick-type tool, hook and pull the primary lower packing ring set (6) up and out of the bon net’s (2)

Page 4 - WARNING

12IOM-988/989-BODY19. Remove body (1) from vise. Solvent clean all loose parts with suitable solvent. Determine parts to be re placed due to wear and

Page 5 - (Note RP)

13IOM-988/989-BODYVI. CALIBRATIONA. General:1. This section only covers cal i bra tion of the control valve with Actuator Models C27/C53.2. Positione

Page 6

14IOM-988/989-BODY11. To limit the up travel at the desired stroke length, rotate the travel stop nut (52) CW and secure to bottom of the attachment

Page 7

15IOM-988/989-BODYc. Rotate lower jam nut CCW to shorten the combined stem length. DO NOT allow actuator stem (6) to rotate in the actuator.d. Rotat

Page 8

16IOM-988/989-BODYVII. TROUBLE SHOOTING GUIDE1. Valve is “jumpy” in stroking.SECTION VIIPossible Cause RemedyA. Excess packing friction. A1.A2.A3.A4.

Page 9

17IOM-988/989-BODY4. Valve exhibits “excess” seat leakage.Possible Cause RemedyD. Excess wear. D1.D2.D3.D4.D5.Oversized valve operating too close to

Page 10 - CAUTION

18IOM-988/989-BODYSECTION VIIINEW REPLACEMENT UNIT:Contact your local Cashco, Inc., Sales Rep re sen- ta tive with the Serial Number and Product code.

Page 11 - IOM-988/989-BODY

19IOM-988/989-BODY ITEM NO. DESCRIPTION 1 Body 2 Bonnet 3 Plug & Stem Assembly 4 Packing Flange 5 Packing Follower 6 Packing 7 Packing Wa

Page 12

2IOM-988/989-BODYIII. INSTALLATIONA. Orientation:1. Recommended orientation when installed in a hor i -zon tal pipe line is with the stem vertical. V

Page 13 - SECTION VI

MODEL 988/989 BODY ASSEMBLY (BA)External Live Loaded Packing — Metal Seated Design ITEM NO. DESCRIPTION 1 Body 2 Bonnet 3 Plug & Stem Assembl

Page 14

3IOM-988/989-BODYC. Removal From Piping System:1. Care should be taken in removal of separable ﬂ anged units. Run wire in 180° crossing pattern thro

Page 15

4IOM-988/989-BODYV. MAINTENANCEA. General:1. Maintenance procedures hereinafter are based upon re mov al of the valve/actuator unit from the pipeline

Page 16 - SECTION VII

5IOM-988/989-BODYc. Step B. Support the (AA) from above. Fully loosen yoke nut (25) to re mov al. Lift the (AA) up wards approximately 1/4"–3/8

Page 17

6IOM-988/989-BODYD. Trim and Packing Removal and Replacement for Units with Internal Live-Loaded Packing; Opt-STD or Opt-KRI: (See pg. 19 for Item #

Page 18 - VIII. ORDERING INFORMATION

7IOM-988/989-BODY26. With the cage (10) oriented correctly on the stem assembly (3), set plug head down into the seat ring (11). Keep ﬁ rm hold of th

Page 19

8IOM-988/989-BODY6. Remove all bonnet stud nuts (17).7. Lift bonnet (2), plug/stem assembly (3), cage (10), and all pack ing zone parts up and out o

Page 20

9IOM-988/989-BODY22. Examine gaskets (12,13) to see if leakage oc- curred. Re move and discard both gas kets. Always use new gaskets upon reassembly.

Modèles reliés 989 | 988 |

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Cashco 988-MB Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Accessoires pour l'eau Cashco 988-MB. Cashco 988-MB User Manual Manuel d'utilisatio

Résumé du contenu

Modèles reliés 989 | 988 |

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