Emerson Fisher easy-e ET Datasheet download pdf

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Fisherr Cavitrol™ III One-, Two-, and

Three-Stage Trims

Cavitrol III trims (figures 1, 2, and 3) are used for

cavitating liquid applications in various globe and

angle valve bodies (see tables 1, 2, and 3). (Contact

your Emerson Process Management sales office for

angle valve information.) One-stage trims are normally

used where the pressure drop is below 99 bar (1440

psi);two-andthree-stagetrimsarenormallyused

where the pressure drop is between 99 and 207 bar

(1440 and 3000 psi). The Cavitrol III trims are

frequently used in pump recirculation and startup

systems in the power, process, oil production,

chemical refining, and other industries.

Unless otherwise noted, all NACE references are to

NACE MR0175-2002.

Features

 Controls or Helps to Eliminate Cavitation

Damage–Cavitrol III trim can lengthen valve service

life and reduce maintenance downtime. The shape

and spacing of holes in the cage wall circumference

helps prevent cavitation in a properly sized valve,

effectively controlling or helping to eliminate

(depending upon service conditions) cavitation

damage and resulting valve failure.

 Rangeability–Many special characterizations are

available in Cavitrol III cages to match rangeability

requirements of specific systems.

 Resistance to Erosion Damage–Standard hardened

trim materials provide excellent wear resistance,

resulting in long trim life. The contoured valve plug

seat reduces fluid separation, helps direct fluid away

from trim, and helps protect against erosion

damage.

 Versatility–Available i n NPS 1 to 24 globe or angle

valves with weld-end or flanged-end connections.

W3708-1

CAVITROL III ONE-STAGE TRIM PARTS

CAVITROL III TWO- OR THREE-STAGE TRIM PARTS

W3559

 Easy Maintenance–Cage-type trim allows removal

and inspection of parts without taking the valve

body out of the pipeline. Fine particles very seldom

cause the accumulation problem associated with

labyrinth-type trim.

 Efficient Operation–A low inlet pressure to the final

stage is maintained by the flow-down configuration

and the successively larger flow area of each stage.

At the third stage inlet (see figure 6), about 85% of

the total pressure drop has already occurred and the

vena contracta pressure remains above the liquid

vapor pressure. This helps to prevent cavitation in a

properly-sized valve.

 Trim Interchangeability–Cavitrol III one-stage trim

is interchangeable with standard trims. Quick trim

changes can be made with no additional parts, such

as spacers, longer bolts, and special gaskets for

valve sizes greater than NPS 1.

Cavitrol III Trims

D100196X012

Product Bulletin

80.2:030

March 2012

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Three-Stage Trims

www.Fisher.comFisherr Cavitrol™ III One-, Two-, andThree-Stage TrimsCavitrol III trims (figures 1, 2, and 3) are used forcavitating liquid application

Page 2

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 201210Figure 7. Pressure Drop/Temperature Capabilitieswith Seal Ring (Cavitrol III Two- and

Page 3 - Principle of Operation

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 201211Table 6. Non-Standard Dimensions (Cavitrol IIITwo-Stage Trims Only)ET CL600ValveSize,

Page 4

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 201212Emerson Process ManagementMarshalltown, Iowa 50158 USASorocaba, 18087 BrazilChatham,

Page 5

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20122SpecificationsAvailable ValvesOne-stage: See table 1Two- and three-stage Cavitrol III:

Page 6

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20123Specifications (continued)Minimum Seating ForceRefer to figure 4 to determine minimum

Page 7

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20124Figure 1. Sectional View of F isher ET Valve with Cavitrol III One-Stage TrimW3746-2FL

Page 8

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20125Table 1. Additional SpecificationsforCavitrolIIIOne-StageTrimVALVERATINGANDDESIGNVALVE

Page 9

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20126Table 2. Valve Travels and Flow Coefficients (Cav itrol III One-Stage Trim)VALVERATING

Page 10 - Ordering Information

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20127Figure 5. Detail of TSO (Tight Shutoff Trim) Protected Soft SeatINNER PLUGOUTER PLUGCA

Page 11 - Product Bulletin

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20128Table 3. Standard Cavitrol III Trim (Linear Characteristic for Cavitrol III Two-Stage

Page 12

Cavitrol III TrimsD100196X012Product Bulletin80.2:030March 20129Table 5. Trim Material and Temperature LimitVALVEDESIGNVALVERATINGTRIMDESIGNATIONVALVE

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