Emerson Crosby JLT*-JBS-E Series

18
Examples
Valve model number: JBS
Size and orifice: 6 Q 8
Set pressure: 600 psig
Back pressure: 100 psig
Operating temperature: 350 °F
Design temperature: 450 °F
Outlet temperature: 100 °F
Body/bonnet material: Carbon steel
Full lift: 1.243 inches
Rated full capacity of full lift: 374.860 lbs/hr
CROSBY STYLE JOS-E, JBS-E, JLT*-JBS-E, JLT*-JOS-E VALVES
InstallatIon and MaIntenance InstructIons
CASE 1
Capacity required: 250.000 lbs/hr
Selection 1
Maximum, not to exceed, rated nameplate capacity (110% of capacity required): 275.000 lbs/hr
Required capacity of full capacity: 250.000 / 374.860 = 67%
Required lift: 67%×1.243 inches = 0.833 inches
Choose a spacer of 70% of full capacity in Table 10: 11408478
Nameplate restricted lift: 1.243×70%=0.870 inches
Nameplate capacity: 374.860 lbs/hr ×70% = 262.402 lbs/hr
CASE 2
Capacity required: 165.000 lbs/hr
Selection 2
Maximum, not to exceed, rated Nameplate Capacity (110% of capacity required): 181.500 lbs/hr
Required capacity of full capacity: 165.000 / 374.860 = 44%
Required lift: 44%×1.243 inches = 0.547 inches
Choose two spacers of 50% of Full Capacity and 5% Reduction in Table 10: 11408482 and 11408471
Nameplate restricted lift: 1.243×45%=0.559 inches
Nameplate capacity: 374.860 lbs/hr ×45% = 168.687 lbs/hr
NOTES
Nameplate capacity shall be greater than required capacity of 250.000 lbs/hr and lower than maximum of 275.000 lbs/hr
NOTES
Nameplate capacity shall be greater than required capacity of 165,000 lbs/hr and lower than maximum of 181.500 lbs/hr