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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

Emerson Crosby JLT*-JBS-E Series User Manual

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