HOME > PRODUCTS > CONTROL CHOKES
  
 
Standard Materials of Construction
Part \ Service
API Class AA, BB, DD, EE

API Class CC, FF
API Class HH
Body/Bonnet
A350-LF2
AISI 410 / UNS 31803
AISI 4130 with Ni alloy 625 cladding
Flanges
A350-LF2/AISI 4130 ANSI/API
AISI 410 / UNS 31803
AISI 4130 with Ni alloy 625 cladding
Wetted internals
17-4PH SS
UNS 31803
UNS S7718
Valve stem
17-4PH SS
UNS 31803
UNS S7718
Seals static
FPM (Viton)
PTFE Spring energised lip seals
PTFE Spring energised lip seals
Seals, Stem packing & Pressure balance
PTFE Spring energised lip seals
PTFE Spring energised lip seals
PTFE Spring energised lip seals
Bonnet Seal 2” Bonnet Seal 2.5” to 6”
FPM
316 Stainless Steel
FPM
316 Stainless Steel
UNS S7718
Standard Materials of Construction - Trim
Service
Wear components

Non Wear Components
Standard, non severe
17-4PH Stainless Steel
17-4PH Stainless Steel
Water injection
Cobalt alloy 6
Duplex SS UNS 31803
Erosive service
Tungsten Carbide, submicron grade, 6% binder
17-4PH SS/UNS 31803/Ni alloy 718
High erosive service
Tungsten Carbide, submicron, ultrafine, 5% composite binder
17-4PH SS/UNS 31803/Ni alloy 718
Standard end connection/Trim sizing
Nominal body size
Standard end connection sizes
Plug and cage trim
External sleeve trim

Bean size
Cv
Bean size
Cv
2"
2", 3"
-
-
64/64”
20
2.5"
2”, 3”, 4”
96/64”
45
-
-
3"
3", 4"
128/64”
61
94/64”
45
4"
4", 6"
192/64"
200
164/64"
160
5"
4”, 6”, 8”
250/64”
250
220/64”
210
6"
6", 8"
350/64”
450
300/64”
400