Richter RSS/F Series Bellows-Sealed Control Valves - Manual (Page 7)

Series RSS/F
Page 7
9260-060-en Revision 03
TM 7168 Edition 06/2008
1.7 Valve travel
DN Standard PTFE bellows Heavy duty PTFE-bellows Hastelloy bellows
[mm] [inch] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
15 ½“ 15 20 15 20
20 ¾“ 15 20 15 20
25 1" 15 20 15 15 20
40 1½" 15 20 30 15 20 15 20
50 2" 15 20 30 15 20 15 20
65 -- 15 20 30 15 20 15 20
80 3" 30 30 30
100 4" 30 30 30
The valve travel depends on the actuator selected.
1.8 Opening and closing forces required
The values specified in the tables apply to a seat/plug
material of modified PTFE.
With other materials, e.g. PTFE/carbon, higher closing
forces are required. Please inquire at manufacturer's.
If the maximum p is < p2, p2 is used in the tables.
observe the application limits acc. to the pressure-
temperature diagram in Section 1.4.
A mechanical travel stop is required in the area
marked.
It is provided when
p > 10bar/145 psi to Seat-Ø 15-50 mm
p >6 bar/87 psi to Seat-Ø 65 mm
1.8.1 Standard bellows
Opening forces
The opening forces remain below the closing forces and are therefore not shown.
Closing forces
Seat maximum p or p2 in bar
1 2 3 4 5 6 7 8 9 10
mm N N N N N N N N N N
290 310 330 350 370 390 410 430 450 470
290 310 330 350 370 390 410 430 450 470
330 385 435 490 540 595 645 695 750 800
390 460 525 595 665 730 800 865 935 1010
450 545 640 735 830 925 1020 1115 1205 1305
550 680 805 935 1065 1190 1320 1445 1575 1705
680 885 1085
1290 1490 1695 1895 2095 2300 2480
830 1130 1425 1720 2020 2315 2610 2910 3205 3500
1040 1500 1960 2420 2890 3350 3810 4270 4740 5190
1300 1970 2630 3300 3960 4630 5300 5960 6630 7305
1600 2520 3440 4370 5290 6210 7130 8050 8980 9900