Emerson Process Management Product Bulletinlogo
Whisper Trim III Tables Figures Print Version Collapse Expand
 
Whisper Trim ® III Cages

Whisper Trim III Description Whisper Trim III cages (figure 1) provide effective attenuation of aerodynamic noise in vapor, gas, or steam applications involving high pressure drops or high pressure drop ratios. Using a Whisper Trim III cage in conjunction with a properly-sized valve body can substantially reduce the noise level of the control application.
Aerodynamic noise is generated by the turbulence created in the flow of vapor, gas, or steam as the fluid passes through a control valve. To achieve effective noise attenuation, a Whisper Trim III cage utilizes multiple orifices of a special shape, size, and spacing. These orifices break up turbulent fluid streams, reducing noise-producing interactions.
Whisper Trim III cages are available for a variety of valve body types (see table 1). Please refer to the appropriate valve body bulletin for additional construction details.

Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.

       Close Section Above

Features

  • Outstanding Noise Control—Use of a Whisper Trim III cage in a properly sized valve can result in a noise reduction up to 30 dBA compared to the same valve with standard trim. Such a reduction would be similar to the reduction in noise level noticed when moving away from the noise source 94m (308 feet).
  • Optimum Performance—Use of a Whisper Trim III cage provides excellent noise reduction and high flow capacity with the proven control and durability offered by standard Fisher® valve trims. The result: optimum overall performance at a minimum investment.
  • Easy Maintenance—Quick change trim allows fast and easy inspection of the cage without taking the valve body out of the pipeline. Whisper Trim III is interchangeable with standard control valve trim.
  • Long Trim Life—Hardened materials of construction are standard to provide exceptional wear resistance. For more information about trim materials, see the appropriate valve body bulletin.

       Close Section Above

Installation In any installation, the valve must be oriented so the flow complies with the arrow on the side of the valve body. Flow is always up through the seat ring.
Because the Whisper Trim III cage design utilizes a multiple-orifice design, a strainer should be installed upstream of any Whisper Trim III application.
The level A1 through D1 cages have 3.2 mm (0.125 inch) diameter orifices. The level A3 through D3 have 1.6 mm (0.0625 inch) diameter orifices.
       Close Section Above

Ordering Information When ordering, please specify:
1. Required Cv
2. Trim material
3. Valve body design
4. Valve body size
5. Valve materials of construction
6. Service conditions and all other information requested in the valve body bulletin        Close Section Above

Specifications

Availability

See table 1

Trim Material and Selection

See appropriate valve body bulletin

Pressure/Temperature Capability

See appropriate valve body bulletin

Maximum Pressure Drops

As shown in appropriate valve body bulletin, except where further limited by the maximum ∆P/P1 ratio given in table 1.
(Application limitations are based on calculations of the maximum ∆P/P1 ratio. Excessive noise levels could occur if application conditions exceed the maximum ∆P/P1 ratio for a given cage level.)

Flow Characteristic(1)

Linear (restricted linear cages, modified parabolic cages, and special, characterized cages are available--consult your Emerson Process Management sales office)

Flow Direction

Up--through the seat ring and out through the cage orifices

Noise Attenuation

See Catalog 12, section 3 for calculation procedure

Sizing Coefficients(1)

See Catalog 12, section 1 for actual values

Shutoff Classification

See appropriate valve body bulletin

1. For additional sizing information, contact your Emerson Process Management sales office.
        Close Section Above


Table Table 1. Valve Body Constructions with Whisper Trim® III Cages
VALVE DESIGN VALVE SIZE, NPS(3) PRESSURE RATING PORT DIAMETER VALVE PLUG, TRAVEL PERFORMANCE LEVEL,
MAX ∆ P/P1(4)
mm Inch mm Inch 0.60 0.75 0.85 0.99
A1 A3 B1 B3 C1 C3 D1 D3
GX DN 80 (NPS 3) PN 10 - PN 40
(CL150, 300)		 70 - - - 40 - - - X              
DN 100 (NPS 4) 90 40 X              
70(5) 40 X              
DN 150 (NPS 6) 136 60 X              
90(5) 40 X              
ED, ES, ET 1 CL150, 300, 600 33 1.3125 19 0.75 X              
1-1/2 CL150, 300, 600 19
27		 0.75
1.875		 29
19		 1.125
0.75		 X
X		         X
   X
2 CL150, 300, 600 33
59		 1.3125
2.3125		 32
29		 1.25
1.125		 X
X		     X
   X
   X
3(2) CL150, 300, 600 59
87		 2.3125
3.4375		 38
38		 1.5
1.5		 X
X		 X
   X
   X
   X
4(2) CL150, 300, 600 87
111		 3.4375
4.375		 51
51		 2
2
X		 X
   X
   X
   X
6(1)(2) CL150, 300, 600 136
178		 5.375
7		 76
51		 3
2		 X
X		 X
   X
   X
   X
8 CL150, 300, 600 203
203
203		 8
8
8		 51
76
102		 2
3
4		 X
X
X		              
EHD, EHS, EHT 1 CL2500 19 0.75 38 1.5 X              
2 CL2500 25
38		 1
1.5		 29
38		 1.125
1.5		 X
X		    
X		  
X		  
X
3 x 2 CL2500 38 1.5 38 1.5 X              
3 CL2500 33
59		 1.3125
2.3125		 51
38		 2
1.5		 X
X		 X
 X
X
X		  
X		   X
4 x 3 CL2500 59 2.3125 38 1.5 X   X          
4 CL2500 59
73		 3.3125
2.875		 51
51		 2
2		 X
X		  
X
X		       X
6 x 4 CL2500 73 2.875 51 2 X   X X        
6 CL2500 111 4.375 76 3 X X X X       X
8 x 6 CL2500 111 4.375 76 3 X     X   X   X
8, 10 CL1500 178 7 178 7 X X X X X X X X
CL2500 136 5.375 146 5.75
12, 14 CL1500 254 10 184 7.25
CL2500 178 7 178 7
EWD, EWS, EWT 4 x 2 CL150, 300, 600 33
59		 1.3125
2.3125		 32
29		 1.25
1.125		 X
X		     X
   X
   X
6 x 4 CL150, 300, 600 87
111		 3.4375
4.375		 51
51		 2
2
X		 X
   X
X		   X
X		   X
8 x 4 CL150, 300, 600 87
111		 3.4375
4.375		 51
51		 2
2
X		 X
   X
X		   X
X		   X
8 x 6(1)(2) CL150, 300, 600, 900 136
178
178		 5.375
7
7		 127
51
102		 5
2
4		 X
X
X		 X

X		   X

X		   X

X		   X
12 x 6(1)(2) CL150, 300, 600 136
178
178		 5.375
7
7		 165
51
102		 6.5
2
4		 X
X
X		 X

X		   X

X		   X

X		   X
10 x 8 CL150, 300, 600 178
203		 7
8		 152
152		 6
6
X
X		  
X		  
X		   X
12 x 8 CL150, 300, 600, 900 178
178
203
203		 7
7
8
8		 152
203
152
203		 6
8
6
8

X
X

X
X		  

X
X		  

X
X		   X
X
EWD-1, EWT-1 12 x 8 CL900 197 7.75 146 5.75 X X X X X X    
172 6.75 146 5.75             X X
EWND-1, EWNT-1 8 x 6 CL900 136 5.375 127 5 X X   X   X   X
12 x 8 CL900 197 7.75 203 8 X X X X X X    
172 6.75 203 8             X X
EWND-1, EWNT-2 12 x 8 CL300, 600 197 7.75 203 8 X X X X X X    
172 6.75 203 8             X X
EU 12, 16, and 20 Consult bulletin 51.1:EU
EW 16 x 12 thru 24 x 20 Consult bulletin 51.1:EU
FBD, FBT 8 x 12 thru 24 x 24 Consult bulletin 51.1:FB X X X X X X X X
16 x 30 thru 36 x 36 Consult bulletin 51.1:FB X   X X X X X X
HPD, HPS, HPT 1 CL1500, 2500 19
25		 0.75
1		 29
19		 1.125
0.75		 X
X		              
2 CL1500, 2500 19
25
48		 0.75
1
1.875		 29
19
51		 1.125
0.75
2		 X
X
X		    

X		   X

X		    
3 CL1500 48
73		 1.875
2.875		 51
51		 2
2		 X
X		  
X		     X
   X
4 CL1500 73
92		 2.875
3.625		 51
51		 2
2
X		  
X
X
X
X		   X
6 CL1500 111
136		 4.375
5.375		 76
76		 3
3
X
X		  
X		  
X		    
1. Please note that the body/bonnet height may be greater after installing a Whisper Trim III cage. A spacer is required for ED, ET, EWD, and EWT configurations.
2. Other sizes may be available--consult your Emerson Process Management sales office.
3. Two-number valve body size designation for EH, EW, and EWN Series valves indicates end connection size by trim size, but for FB Series valves, it indicates inlet size
by outlet size.
4. The X indicates performance level available for given body-trim configuration. Other cage/body configurations available to meet specific applications.
5. GX unbalanced, restricted trim.

       Close Section Above

       Close Section Above


80.1:010
September 2007
©Fisher Controls International LLC 1988, 2007; All Rights Reserved Printed in USA
Notices