Emerson Crosby JBS-E Series Installation And Maintenance Instructions Manual Download Page 20

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Crosby

STylE JOS-E, JBS-E, JlT*-JBS-E, JlT*-JOS-E ValVES

InstallatIon and MaIntenance InstructIons

Cap

Cap top

Cap stud

Cap stud nut

Cap

O-ring

Cap set screw

Cap

Seal and wire

Type a

Threaded cap

bolted cap

Packed lifting lever Type d

(Top view of packing gland construction used

for special materials)

Packed lifting lever Type d

(Top view)

Packed lifting lever Type d

regular lifting lever Type C

Cotter pin

Spindle

Spindle nut

Spindle

Valve spindle

Spindle

Test rod

Spindle

adjusting bolt

adjusting

bolt nut

Dog shaft

Dog shaft gasket

Dog shaft

Dog

lockwasher

lever nut

lever nut
lever nut lockwasher

lever

Packing gland

Packing

Packing gland sleeve

Packing gland nut

Forked lever

lever

Cap plug

gasket

Cap top gasket

Cap gasket

gasket

Cap or cap

top

Cap and test rod
Type b - screwed cap

Type e - packed lifting lever

Type h - bolted cap

Type K - screwed cap

(standard)

Type M - bolted cap

(standard)

FIguRE 14 - Cap and lifting levers

Type J

(standard)

Type g

Type l

(standard)

Dog shaft bearing

Summary of Contents for Crosby JBS-E Series

Page 1: ...hould use only parts manufactured by Emerson Call your nearest Emerson regional sales office or representative for a service engineer should you wish assistance with your field needs Table of Contents 1 Introduction 4 2 Storage and handling 4 3 Installation 4 4 Hydrostatic pressure tests 5 5 Setting testing and adjustments 6 6 Valve maintenance 10 7 Style variations 21 8 Service records 21 9 Spare...

Page 2: ...art name Notes Notes 1 Consumable spare parts valve parts which should be replaced as part of any disassembly and discs and disc inserts which must be replaced if seats are damaged 2 Repair spare parts valve parts exposed to wear and or corrosion during normal operation They are in fluid flow paths and may require replacement as part of any repair 16 Spindle 3 17 Spindle cotter pin 1 L T orifice 1...

Page 3: ...he pressure setting deform valve parts and affect seat tightness and valve performance adversely Striking a valve which is under pressure can cause premature actuation These precautionary statements are by no means exhaustive Emerson cannot be expected to know evaluate and advise customers of all the possible applications and operating conditions for its products or of the possible hazardous conse...

Page 4: ...ned specifically for liquid service The JLT E features patented contoured liquid trim in a standard JOS E JBS E envelope 3 3 Inlet piping Pressure relief valves should be mounted vertically in an upright position either directly on a nozzle from the pressure vessel or on a short connecting fitting that provides direct and unobstructed flow between the vessel and the valve Installing a pressure rel...

Page 5: ...flange be installed in its place This practice precludes the possibility of any damage to the pressure relief valve Bent spindles and damaged valve seats are problems that can be caused by improper hydrostatic test procedures Blank flanges must be removed and the pressure relief valve reinstalled before the vessel is placed in service When the hydrostatic test must be performed with the valve in p...

Page 6: ...ection 5 8 and specifically in Section 5 8 1 For valves with set points in excess of 500 psig it is recommended that when testing on a low volume test bench the lift be restricted temporarily by use of a gag or other suitable device However it is good practice to inspect the valve prior to installation This inspection determines any damage which may have occurred due to rough handling in transit o...

Page 7: ...r of notches moved so that the ring can be returned to its proper position following testing Moving the notches on the nozzle ring to the left will lower the nozzle ring Replace the nozzle ring set screw before each set pressure test The set screw must engage one of the ring notches being careful that it does not bear on the top of a tooth 5 8 2 Remove the cap or lifting lever following the instru...

Page 8: ...set pressure correction factors at ambient temperature Set pressure psig Increase in spring set pressure 5 9 5 Style JLT The Style JLT in the P Q R and T orifice sizes is preset at the factory and cannot be adjusted externally in the field since the special contoured skirt on the disc holder prevents engagement of the set screw with the nozzle ring As a result the nozzle ring is not slotted and is...

Page 9: ...e with 0 035 inch wall The tube end is cut square and smooth is parallel to and inch below the surface of the water A snap on type test clamp shown in Figure 5 is available Procedure With the valve mounted vertically the leakage rate in bubbles per minute shall be determined with pressure at the pressure relief valve inlet raised up to and held at 90 percent of the set pressure or cold differentia...

Page 10: ... less than ten minutes Allowable leakage rate The maximum allowable leakage rate should not exceed 10 cubic centimeters per hour per inch of diameter of nominal valve inlet size For nominal valve sizes of 1 inch or less the leakage rate shall not exceed 10 cubic centimeters per hour For soft seated valves there shall be no leakage for one minute Soft seated valves For exceptional seat tightness an...

Page 11: ...rts may be cleaned by wire brushing provided the brushes used do not damage nor contaminate the base metals Only clean stainless steel brushes should be used on stainless steel components The internal parts such as the guide disc holder disc insert nozzle ring and spindle should be cleaned by immersion in a commercial high alkaline detergent Guiding surfaces on the disc holder and guide may be pol...

Page 12: ...s have been damaged badly by dirt or scale lapping the seating surfaces should restore them to their original condition Never lap the disc insert against the nozzle Lap each part separately against a cast iron lapping block of the proper size These blocks hold the lapping compound in their surface pores and must be recharged frequently Lap the block against the seat Never rotate the block continuo...

Page 13: ...be tight nor will it operate properly unless all parts are machined correctly The most satisfactory way to machine a nozzle is to remove it from the valve body However it may also be machined while assembled within the valve body In any event it is vitally important that the seating surfaces run absolutely true before machining Figure 10 Nozzle seat critical dimensions Minimum face to seat dim ref...

Page 14: ...disc holder 5 and guide 15 by sliding the guide over the disc holder Note the guide for D and E orifice valves protrudes up into the valve bonnet 6 6 6 Install the two guide gaskets 28 one above and one below the guide Note when assembling bellows valves the bellows flange eliminates the need for a bottom guide gasket 6 6 7 While holding the top of the disc holder install the guide into the body A...

Page 15: ...asure the valve lift Install the limit spacer see Figure 13 with the chamfer down and reassemble the valve as described in Steps 6 6 1 through 6 6 10 Note install bellows to disc holder for JBS F orifice valve then install spacer Measure the lift of the valve and compare it with the required lift as given on the restricted lift nameplate with tolerance 020 0 020 0 50 mm 0 50 mm Based on the result...

Page 16: ...67 11408750 0 051 F 1 4 11408566 0 099 11408577 0 078 11408588 0 058 F 5 7 11408566 0 099 11408577 0 078 11408588 0 058 G 11408820 0 120 11408821 0 093 11408823 0 066 H 11408831 0 141 11408832 0 108 11408834 0 075 J 11408844 0 172 11408845 0 130 11408847 0 087 K 11408859 0 204 11408860 0 153 11408861 0 103 L 1 4 11408390 0 248 11408391 0 185 11408392 0 122 L 5 6 11408405 0 261 11408406 0 198 11408...

Page 17: ...1408577 0 078 11408519 0 054 F 5 7 11408691 0 105 11408657 0 079 11408623 0 054 G 11408816 0 126 11408821 0 093 11408817 0 061 H 11408826 0 151 11408832 0 108 11408827 0 069 J 11408837 0 186 11408838 0 133 11408540 0 081 K 11408851 0 217 11408860 0 153 11408852 0 092 L 1 4 11408865 0 268 11408866 0 189 11408867 0 111 L 5 6 11408397 0 281 11408398 0 202 11408399 0 124 M 11408413 0 296 11408414 0 20...

Page 18: ...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 sp...

Page 19: ... ring soft seat or vice versa Type D Install the cap gasket on the bonnet Screw the spindle nut onto the spindle Place the dog in the cap and install the dog shaft so that the dog is horizontal and the square on the end of the dog shaft has a corner on top With the dog shaft in the position above scribe a horizontal line on the end of the dog shaft This line must be horizontal when the lifting gea...

Page 20: ...otter pin Cotter pin Cotter pin Pin Pin Spindle Spindle nut Spindle nut Spindle Valve spindle Spindle Test rod Spindle Adjusting bolt Adjusting bolt nut Dog shaft Dog shaft Dog shaft gasket Dog shaft Dog Dog Lockwasher Lever nut Lever nut Lever nut lockwasher Lever Lever Packing gland Packing Packing gland sleeve Packing gland nut Forked lever Lever Cap plug Cap plug gasket Cap top gasket Cap gask...

Page 21: ...parts the valve shop number assembly number or serial number should be given together with set pressure part name and item number valve size and style On the valve nameplate the valve assembly number is shown as shop number Spare parts may be ordered from any Emerson regional sales office or representative 10 Trouble shooting pressure relief valves Troubles encountered with pressure relief valves ...

Page 22: ...e of the product The advice of a qualified engineer should be sought prior to any use of the product Any installation maintenance adjustment repair or test performed on the product must be done in accordance with the requirements of all applicable codes and standards The information specifications and technical data the Specifications contained in this document are subject to change without notice...

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