Bulletin 51.1:YD Table 1. Travel, Port, and Gasket Loading Pressure Drop Information MAXIMUM RATED TRAVEL
VALVE SIZE, INCHES 1/2, 3/4, 1, 1-1/2 2, 2-1/2 3 4 6
SEAT RING PORT DIAMETER
mm
Inches
mm
Inches
19 29 38 51 51
3/4 1-1/8 1-1/2 2 2
33.3 58.7 87.3 111.1 177.8
1-5/16 2-5/16 3-7/16 4-3/8 7
PRESSURE DROP LIMIT DUE TO GASKET LOADING Design YS Design YD(1) bar
psig
bar
psig
41.4 31.7 37.9 38.6 52.4
600 460 550 560 760
103.4
1500
1. For standard Design YD only. For high temperature Design YD, consult your Fisher sales office.
Table 2. Trim Materials MATERIAL
PART Valve Plug
Trim 2(1)
Trim 1
Trim 2A
Design YD
CB7Cu-1 (17-4PH SST)
CF8M (316 SST)
CF8M/CoCr-A
Design YS
S41600 (416 SST)
S31600 (316 SST)
CF8M/CoCr-A
Upper Cage and Lower Cage
CB7Cu-1
CF8M, ENC
CF8M, ENC
Upper Cage Retaining Ring (High-Temperature Design YD Only)
S41600
CF8M
CF8M
Upper Seat Ring (Design YS Only) and Lower Seat Ring
S41600
S31600
S31600/CoCr-A
1. Standard trim for stainless steel valves.
10A8391–A
B2413 / IL
10A8391–A
DESIGN YD PLUG DOWN
Figure 5. Flow Directions
6
10A8392–A
DESIGN YD PLUG UP
10A8392–A
DESIGN YS PLUG DOWN
DESIGN YS PLUG UP