Samson 3251-E - Page 23

EB 8052-E EN 3-7
Design and principle of operation
Table 3-1: Technical data for Type3251-E
Material
Cast steel
A216 WCC
Cast stainless steel
A351 CF8M
Valve size and pressure rating NPS3 to 8 in Class600
Type of connection Flanges RF and RTJ
Seat-plug seal Metal seal · High-performance metal seal
Characteristic Equal percentage · Linear · Mod. linear · On/off
Rangeability 50:1
RFID tag (optional)
Application range according to the technical specications and the
explosion protection certicates.
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Electronic nameplate
Conformity
3)
·
Temperature ranges
2)
in °F (°C) · Permissible operating pressures acc. to pressure-temperature dia-
grams (see Information Sheet uT8000-2)
Body
without
insulating
section
Standard PTFE
packing
14 to 428 (–10 to +220)
LLF20 PTFE packing 14 to 482 (–10 to +250)
High-temperature
packing
14 to 662 (–10 to +350)
Trim
1)
Metal seal –325 to +1022 (–196 to +550)
Balanced with PTFE –58 to +482 (–50 to +250)
RFID tag (optional) Max. permissible operating temperature: 185 (85)
Leakage class according to ANSI/FCI70-2
Trim
Metal seal Standard: IV · High-performance metal seal: V
Balanced, metal
seal
With PTFE (standard): IV · High-performance metal seal: V
1)
Only in combination with suitable body material
2)
The temperature limits (in °F and °C) are not directly converted temperatures.
3)
Certicates available in 2021