The 9800 series pilot operated relief valve has two principal advantages over other types of relief valves:1. It is bubble tight to set pressure.2. It is fully open at less than 10% above set pressure.These characteristics permit an operating pressure nearer to the maximum allowable working pressure of the tank. High operating pressures reduce evaporation and total venting volume, thereby reducing product loss and cost of processing emissions.
Model
9800 Pilot Operated Pressure/Vacuum Relief Valve
9805 Pilot Operated Pressure Relief Valve
Design Features
Sizes available 2″~12″(DN50~DN300);
Fully open at less than 10% above set pressure
Pipe away；
Designed and tested according to API 2000；
The flanges are accordance with ANSI B16.5,or EN1092、JIS;
Available Materials：Aluminum、Carbon Steel、Stainless Steel、Special Materials on Application；
Setting Pressure/Vacuum
Setting KPa
|
9800
|
9805
|
Set pressure
|
0.5~103.4
|
0.5~103.4
|
Set Vacuum
|
-0.2~-4.3
|
/
|
Dimensions, mm
Nominal Size
|
L1
|
L2
|
W
Width
|
H1
|
H2
|
A
|
B
|
C
|
2″x3″
|
338
|
191
|
280
|
340
|
525
|
115
|
282
|
112
|
3″x4″
|
406
|
233
|
280
|
765
|
580
|
138
|
301
|
112
|
4″x6″
|
472
|
294
|
280
|
870
|
655
|
179
|
360
|
148
|
6″x8″
|
594
|
354
|
345
|
1025
|
755
|
214
|
460
|
202
|
8″x10″
|
720
|
412
|
405
|
1005
|
700
|
240
|
514
|
214
|
10″x12″
|
860
|
486
|
485
|
1080
|
745
|
283
|
614
|
246
|
12″x14″
|
998
|
562
|
535
|
1140
|
795
|
321
|
696
|
280
|