4 Valve Description
46 of 100
4.5.2.6 Function
The main components of the gate valves are the body (100), the yoke (166), the
wedge (360), the stem (200) and the actuating unit.
Stem seal
The gland packing (461), which seals off the stem (200), is tightened via the gland
follower (452) by means of studs (902) and nuts (920). The yoke (166) features an
integral back seat which seals off the valve when the stem (200) is fully retracted.
Seat/disc interface
The integral seating surfaces in the body (100) are hard-faced. The wedge (360) is
connected to the stem (200) by a "T" joint.
Bonnet/cover seal
The yoke (166) is bolted to the body (100). The joint is sealed by a joint ring (411).
4.5.3 ECOLINE GTF 800-2500
4.5.3.1 Operating data
Table 46: Operating properties
Characteristic
Value
Nominal pressure
Class
800 - 2500
Nominal size
NPS
½
" - 2"
Max. permissible pressure
431
bar /
6250
PSI
Min. permissible temperature
0 °C / 32 °F
Max. permissible temperature
+538
°C /
+1500
°F
Temperatures < 0 °C on request
Selection as per pressure/temperature ratings
(
ð
Section 4.5.3.4, Page 47)
4.5.3.2 Fluids handled
▪
Steam
▪
Fluids containing gas
▪
Gas
▪
High-temperature hot water
▪
Feed water
Summary of Contents for ECOLINE FYC
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