Samson 3291, Translation Of Original Instructions

Page: 21 / 96

EB 8072 EN 3-5
Design and principle of operation
Table 3-1: Technical data for Type 3291
Material
Cast steel
A352 LCC
Cast steel
A216 WCC
Cast steel
A217 WC6
Cast stainless steel
A351 CF3M A351 CF8M
Valve size NPS ½ to 8
Pressure rating Class 150 to 900
Type of
connection
Flanges All ANSI versions
Welding ends According to ANSI B16.25
Seat-plug seal Metal seal · Soft seal · High-performance metal seal
Characteristic Equal percentage · Linear · On/off
Rangeability 50:1
Compliance
·
Temperature ranges in °F (°C) · Permissible operating pressures according to pressure-temperature diagrams (see
Information Sheet
u
T 8000-2)
Body without insulating section
14 to 428 (–10 to +220) · Up to 660 (350) with high-temperature packing
depending on material
Body with
Insulating section
–51 to +649
(–46 to +343)
–20 to +800
(–29 to +425)
–20 to +842
(–29 to +450)
–325 to +842
(–196 to +450)
–325 to +842
(–196 to +450)
Bellows seal –51 to +649
(–46 to +343)
–20 to +800
(–29 to +425)
–20 to +842
(–29 to +450)
–325 to +842
(–196 to +450)
–325 to +842
(–196 to +450)
Valve
plug
1)
Standard
Metal seal –325 to +842 (–196 to +450)
Soft seal –325 to +428 (–196 to +220)
Balanced with PTFE ring –40 to +428 (–40 to +220) · Lower temperatures on request
Balanced with graphite ring –40 to +842 (–40 to +450)
Leakage class according to ANSI/FCI 70-2
Valve
plug
Standard
Metal seal IV · High-performance metal seal: V
Soft seal
2)
VI
Balanced, metal seal
Standard: IV (with PTFE or graphite ring)
High-performance metal seal: V (only with PTFE ring)
1)
Only in combination with suitable body material
2)
On request