Description - Fisher NPS 12 Instruction Manual

Instruction Manual
D103553X012
Table 2. WhisperFlo Trim Specifications
Trim Material and Selection
J 316 Stainless Steel w/ hardfacing
J 410 Stainless Steel, hardened
J Others per application
Temperature Capability
J ET: -73 to 232_C (-100 to 450_F) up to 316_C
(600_F) with HTS1 option
J ED: -29 to 538_C (-20 to 1000_F)
J Others per application
Maximum Pressure Drops
As shown in this bulletin. Also see Bulletin
51.1:Large_ET_ED, Fisher Large ET and ED Valves NPS
12 through 16
WhisperFlo Aerodynamic Trim Pressure Ratings
Up to 1500 psi drop
Velocity Limits
WhisperFlo trim is designed for 0.3 MACH as an
inherent outlet velocity limit. Variations higher and
lower may be applied per special applications -
1. Other pressures on application.
2. The pressure/temperature limits in this instruction manual and in any applicable standard limitations should not be exceeded.

Description

Fisher NPS 12 through 16 and NPS 30 CL150 through CL600 ET and ED control valves are used for either throttling or
on-off control of a wide variety of liquids and gasses.
ET valves with a hanging cage are available for demanding applications in oil and natural gas up to 232_C (450_ F). The
hanging cage, with the seat ring threaded into the cage, provides the valve with easy­maintenance trim. The seal
between the plug and cage and the seal between the seat ring and body are spring­loaded PTFE. The spring­loaded
PTFE seal configuration can provide Class V shutoff per ANSI/FCI 70­2 and IEC 60534­4. The temperature range can be
extended to 316_C (600_F) for non­oxidizing service and to 260_C (500_ F) for oxidizing service by using PEEK (Poly
Ether Ether Ketone) anti­extrusion rings in combination with the spring­loaded PTFE seals.
ED valves also utilize a hanging cage and a seat ring that is bolted into the body. These valves have metal­to­metal
seating and two graphite piston rings between the cage and plug. They are used for high temperature applications
between 316_C (600_F) and 593_C (1100_ F) with a Class IV standard shutoff. Shutoff can be increased to Class V by
using the Bore seal trim.
To help reduce aerodynamic noise in gas service, Whisper Trim III and WhisperFlo cages are available. Cavitrol III cages
are available to eliminate the effects of liquid cavitation damage and DST, Dirty Service Trim, is available for cavitating
liquid with particulates.
Fisher WhisperFlo trim represents state of the art solutions for applications that demand ultimate aerodynamic noise
attenuation.
consult your Emerson Process Management sales
office
Flow Characteristic
Linear (restricted linear cages and special,
characterized cages are available--consult your
Emerson Process Management sales office)
Rangeability
65:1
High rangeability in excess of 250:1 is available in
some constructions. Contact your Emerson Process
Management sales office for details
Flow Direction
Standard and Cavitrol III Cages: Down
(1,2)
Whisper Trim III Cages: Up
WhisperFlo Cages: Up
Noise Attenuation
Approximately -40 dBA maximum depending on the
ratio per IEC 60534-8-3 calculation procedure
nP/P
1
Large ET and ED Valves
July 2014
3