KSB ECOLINE FYC, Operating Manual

Page: 42 / 100

4 Valve Description
42 of 100
Part No.
Description Material
A 216 WCB A 217 WC6 A 217 WC9 A 217 C5
A 217 C12 A 352 LCB A 352 LCC A 351 CF8 A 351 CF8M
920.3 Handwheel nut Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel Stainless
steel
Stainless
steel
300 Bearing Steel Steel Steel Steel Steel Steel Steel Steel Steel
458 Lantern ring 13Cr 13Cr 13Cr 13Cr 13Cr 304 304 304 316
636 Lubricating
nipple Steel Steel Steel Steel Steel Steel Steel Stainless
steel Stainless
steel
902.2 Stud A 193 B7 A 193 B16 A 193 B16 A 193 B16 A 193 B16 A 320 L7 A 320 L7 A 193 B8 A 193 B8
920.4 Nut A 194 2H A 194 Gr. 7 A 194 Gr. 7 A 194 Gr. 7 A 194 Gr. 7 A 194 Gr. 7 A 194 Gr. 7 A 194 Gr. 8 A 194 Gr. 8
Table 40: Trim materials
Part No. Description Trim 1 Trim 2 Trim 5 Trim 8 Trim 10
13% chrome steel (Cr) /
13% chrome steel (Cr) 304 / 304 Stellite / Stellite Stellite / 13% chrome
steel (Cr) 316 / 316
361 Flexible wedge 13% chrome steel (Cr) 304 stainless steel Stellite 13% chrome steel (Cr) 316 stainless steel
515 Seat ring 13% chrome steel (Cr) 304 stainless steel Stellite Stellite 316 stainless steel
200 Stem 13% chrome steel (Cr) 304 stainless steel 13% chrome steel (Cr) 13% chrome steel (Cr) 316 stainless steel
450 Back seat bush 13% chrome steel (Cr) 304 stainless steel 13% chrome steel (Cr) 13% chrome steel (Cr) 316 stainless steel
4.5.1.6 Function
The main components of the gate valves are the body (100), the yoke (166), the
flexible wedge (361), 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 eyebolts (900) and nuts (920.2). The yoke (166) is
equipped with a back seat bush (450) which seals off the valve when the stem (200) is
fully retracted.
Seat/disc interface
The hard-faced seat rings (515) are welded into the body (100). The seating surfaces
of the flexible wedge (361) are hard-faced. The flexible wedge (361) is fastened to
the stem (200) by a "T" joint and guided by lateral guide bars in the body (100).
Bonnet/cover seal
The body (100) and the yoke (166) are connected by studs (902.1) and nuts (920.1).
The joint is sealed by means of a joint ring (411).