Emerson Crosby HSJ Series Installation, Operation And Maintenance Instructions Download Page 7

7

Crosby

 SerieS HSJ Safety valveS

InstallatIon, operatIon and maIntenance InstructIons

repair procedure

all the parts should be cleaned thoroughly. 
Guiding surfaces may be polished using a fine 
emery cloth. all parts should be examined to 
determine their condition. inspection of valve 
components is important to ensure proper 
valve performance.
Damaged valve parts must be repaired or 
replaced. Parts identification may be found in 
figure 1 on page 2.

lapping or refurbishing of valve seats

Good seating surface on the nozzle (2) and disc 
insert (6) or disc (6a) are of the greatest 
importance when reconditioning the safety valves.
the seats should be flat and free from surface 
scratches.

lapping compounds

experience has proven that medium coarse, 
medium, fine and polish lapping compounds 
will condition any damaged safety valve seat 
properly except where the damage requires 
machining. the following lapping compounds, 
or their commercial equivalents are suggested:

lapping procedure

unless the seats have been damaged badly 
by dirt or scale, lapping the seating surfaces 
should restore them to their original condition.
Never lap the disc insert or disc 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 reconditioned frequently. 
lap the block against the seat. Never rotate 
the block continuously, but use an oscillating 
movement. extreme care should be taken 
throughout to make certain that the seats are 
kept perfectly flat.
if considerable lapping is required, spread a 
thin coat of medium coarse lapping compound 
on the block. after lapping with this compound, 
lap again with a medium grade compound. the 
first step can be omitted unless much lapping 
is called for.
Next, lap again using a fine grade compound.

machining of nozzle seats

if machining of the nozzle seat or other major 
repairs are necessary it is recommended that 
the valve be returned to a emerson authorized 
facility for repair. all parts must be machined 
accurately per emerson specifications. No 
safety valve will be tight, nor will it operate 
properly unless all parts are correctly 
machined. if unable to a return to a emerson 
authorized repair facility for remachining, use 
of a reseating machine is recommended.

lapping block

lapping blocks are made of a special grade of 
annealed cast iron. there is a block for each 
orifice size. each block has two perfectly flat 
working sides and it is essential that they retain 
this high degree of flatness to produce a truly 
flat seating surface on the disc, or disc insert 
and/or the nozzle.
Before a lapping block is used, it should be 
checked for flatness and reconditioned after 
use on a lapping block resurfacing plate. the 
block should be lapped in a figure eight motion, 
applying uniform pressure while rotating the 
lapping block against the plate as shown in 
figure 3.
lapping blocks and lapping block resurfacing 
plates are available from emerson sales, 
service and distribution centers.

table 1

grit compound no.

description

320

Medium coarse

400

Medium

600

fine

900

Polish

fiGure 3

When all nicks and marks have disappeared 
remove all the compound from the block and 
seat. apply polish compound to another block 
and lap the seat.
as the lapping nears completion only the 
compound left in the pores of the block 
should be present. this should give a very 
smooth finish. if scratches appear, the 
cause is probably dirty lapping compound. 
these scratches should be removed by using 
compound free of foreign material.
Discs and disc inserts should be lapped in the 
same way as nozzles. the disc insert must be 
removed from the holder before lapping. Before 
the disc insert is placed back in the holder all 
foreign material should be removed from both 
parts. the insert must be free when in the 
holder. if the disc insert is damaged too badly 
to be reconditioned by lapping, it should be 
replaced. remachining the insert will change 
critical dimensions, affect the action of the 
valve and is not recommended.

top lapping 

surface

lapping block 

to be squared up

Bottom rough 

surface do not use

Motion shown 

by dotted lines

lapping block resurfacing plate

lapping block

Summary of Contents for Crosby HSJ Series

Page 1: ... safety of lives and property often depends on the proper operation of the safety valves Consequently the valves should be kept clean and should be tested periodically and reconditioned to make sure they function properly Service records Service records should be completed before a valve is returned to service These records are important and will provide guidance on establishing time intervals bet...

Page 2: ...ainless steel Stainless steel 3 18 Adjusting bolt nut Steel Steel 3 19 Cap lever assembly Steel iron Steel iron Gaskets Organic fiber non asbestos Organic fiber non asbestos 1 One piece disc 6A replaces part reference numbers 5 6 and 7 in orifice sizes F G H and J for CL 150 CL 300 and CL 600 Figure 1 Seal and wire Seal and wire Notes On Series HSJ with closed bonnet option except Series HSJ DOW t...

Page 3: ...g must be removed completely before installation foreign material entering the valve may cause seat leakage plugging and valve malfunction Fixed support anchored to building structure Recommended minimum diameter larger than valve inlet Notes Refer to ASME boiler code section 1 pg 71 2 Allow sufficient space to prevent bottoming or side binding of the drip pan to the discharge pipe under maximum c...

Page 4: ... designed to withstand the total resultant forces due to the valve discharging at the maximum accumulated pressure and the expected piping loads Crosby Series HSJ safety valves Installation operation and maintenance instructions Outlet piping Discharge piping should be simple and direct Where possible a short vertical pipe connected through a long radius elbow discharging directly into the atmosph...

Page 5: ...e making any adjustments reduce the system pressure under the valve 10 to 20 below the set pressure stamped on the valve This will prevent damage to internal parts and minimize the chance of an inadvertent valve opening For parts identification see Figure 1 on page 2 a Remove the cap 19 and lifting lever device if any following the instructions on page 8 b Loosen the adjusting bolt nut 18 c Turn t...

Page 6: ...if any following the instructions on page 8 c Before releasing the spring load measure and make note of the height of the adjusting bolt 17 over the top of the bonnet 14 This information will help when reassembling the valve to its approximate original setting d Loosen the adjusting bolt nut 18 Count the number of turns required to remove the spring load by rotating the adjusting bolt 17 in a coun...

Page 7: ...acility for repair All parts must be machined accurately per Emerson specifications No safety valve will be tight nor will it operate properly unless all parts are correctly machined If unable to a return to a Emerson authorized repair facility for remachining use of a reseating machine is recommended Lapping block Lapping blocks are made of a special grade of annealed cast iron There is a block f...

Page 8: ...zle ring 3 below the seats Release the spindle slowly to permit the disc insert to contact the nozzle seat gently Check that the nozzle ring moves freely k Screw the adjusting bolt 17 and nut 18 into the top of the bonnet 14 the same number of turns originally required to remove the spring load The original set pressure can be approximated by screwing the adjusting bolt down to the height above th...

Page 9: ...ed lever pin and forked lever pin cotter Position the lever opposite the valve outlet and install the four cap set screws and tighten them against the groove in the top of the bonnet 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 corn...

Page 10: ... Top view Packed lifting lever type D Regular lifting lever type C Screwed cap and test rod type B Test rod Test rod Test rod Lever Cap Valve spindle Spindle nut Forked lever Pin Pin Lever Cap set screw Cotter pin Cotter pin Cotter pin Cap top gasket Cap top gasket Dog Dog Dog shaft Spindle Adjusting bolt Adjusting bolt nut Cap gasket Cap gasket Cap plug Cap plug Dog shaft O ring Dog shaft bearing...

Page 11: ...193 6 193 128 727 128 727 157 302 157 302 157 302 157 302 L 5 350 5 350 5 568 6 256 6 256 135 890 135 890 141 427 158 902 158 902 M 5 881 5 881 5 881 6 693 6 693 149 377 149 377 149 377 170 002 170 002 N 6 990 6 990 6 990 177 546 177 546 177 546 P 6 303 8 053 8 053 160 096 204 546 204 546 Q 7 178 7 178 7 178 182 321 182 321 182 321 Crosby Series HSJ safety valves Installation operation and mainten...

Page 12: ...ction use and maintenance of any product remains solely with the purchaser and end user Crosby is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co Emerson Automation Solutions Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co All other marks are the property of their respective owners The contents of th...

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