ML19254A948

Consolidated Closed Bonnet Maxiflow Safety Valve. B&W Instruction Book 620-0006

ML19254A948
Person / Time
Site:	Crane
Issue date:	03/28/1979
From:	DRESSER INDUSTRIES, INC.
To:
References
PROC-790628, TM-0804, TM-804, NUDOCS 7909140497
Download: ML19254A948 (21)

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O CONSOLIDATED CLOSED BONNET MAXiFLOW

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SAFETY VALVE BABC0CK & WILCOX INSTRUCTION BOOK NO. 620-0006' 01 0003 00 23 '//- y 28-9 -5"

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'T TABLE OF CONTENTS Section I Page 1

General..

1 Adjustment 3

Disassembly 3

Maintenance 6

Lapping Procedure 6

Spindle Runout 8

Assembly 8

Lift Adjustment

• l SECTION 11 CONSOLIDATED @ MAXIFLOW@ VALVE 10 ROTO. LAP MACHINE

....... 10 GENERAL DESCRIPITON 10 ASSEMBLY 10 USE..

SECTION 111 1568 CONSOLIDATED @ HYDROSET TESTING DEVICE

. 12 SECTION IV 13 REPLACEMENT PARTS AND SERVICE 9, s

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GENERAL ADJUSTMENT All 31700 Safety Valves are steam tested at ConsolidetedC Series 31700 Steam Safety the factory. Every valve is set to have a clean pop-Valves are designed and certified under Section ping action and to reseat tightly. However, because III of the ASME Code for application in nuclear the boiler used in setting the valves has a small power generating systems.

capacity compared to the capacities of the 31700 I

type of valves, slight adjustments on the actual The details of the installation of any safety installation are necessary to maintain proper action i

valve are governed to a large extent by the ASME and blowdown.

j Code. Pertinent paragraphs are: N.911.1 to N.911.3 of Section IIL Popping Point and Adjustment 3

To change the po ping pressure of the valve 4

Safety valves are carefully adjusted at the remove the cap and fever assembly, loosen the j

factory using high pressure steam to assure that lock nut and turn the compression screw clock-wise set pressure closmg pressure, and operation are to increase pressure, or counter clock-wise to j

correct.

decrease pressure. After each adjustment of the

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compression screw the locknut should be J

Inlet and outlet connections are protected for tightened.

j shipment-and storage. Accumulation of sand, dirt, j

etc. in relief valve inlet ports will be carried across Ring Adjustment j

the seat while 'tha valve is in operation and is fre-quently the cause of eat leaks and unsatisfactory The positions of the upper adjusting ring and operation. To prevent future trouble, store Safety the lower adjusting ring ne locked by means of Valves in a clean dry place and do not remove the the upper adjusting ring pin and the lower ring i

P n respectively. These pins are threaded into the i

wooden skid or flange protectors until ready for installation.

valve body and engage notches which are cut into the rings. To adjust either ring the corresponding gPn t be emoved. A screw driver can be i

Safety Valves must be connected on full sized f

vessel nozzles as direct and close as possible to the vessel (Fig.1). No stop valve should be placed between the pressure vessel and i,ts relief valve Adjustment of the valve can be best under-except as permitted by code regulations. The valve stood by a consideration of the function of the two should be installed hi a vertical position only. In-rings. Together, the rings form a secondary orift,ce let bolts must be drawn down evenly to prevent which governs the pressure acting on the dise distortion of the valve body and inlet nozzle.

when the valve is open. The position of the upper ring relative to the seat will vary the degree which the steam cb nges direction in flowing through The size of the discharge piping should never the valve r.ad will therefore vary the " reaction" be less than the valve outlet size. The arrange-on the lower face of the dise holder. A low posi-mer;t should be as short and direct as possible, and tion of the upper ring will result in a long blow-sho.11d be designed and installed to eliminate all down, a high position will result in a short possible piping strains on the valve from various blowdown.

sources.

The Icwer ring is used to obtain a clean PoPP ng action and to cushion the closing action i

In the event that a water sealloop is required, the size of the loop and the fluid temperature must of the valve. (DO NOT A'ITE?,IPT TO ADJUST be taken into consideration.

BLOWDOWN WITH THE LOWER RING.)

In deta' the rings should be used as follows Ist The water seal loop must be large enough in diameter to assure that the in adjusting one valve. The lower ring should be pressure droo at the valve inlet, when set mitially at about, one notch below the seat the valve is tilowing, is not greater than level for every 200 psi of set pressure (10 notches 50% of the blowdown ~

for a 2000 psi valve). The upper ring should be set at about 13 notches above seat level, regard.

Tem erature of the fluid in the water less of prersure.

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2nd seal foop must be maintained at 620' if The 'wer ring should be moved upward the valve is to operate against the max-slowly, one notch at a time, to remove simmer. The imum back pressure of 750 P.S.I. if the most ideal position for the lower ring is the lowest amount of water is not limited. If the position that does not introduce simmer. In this

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back pressure against which the valve is connection, it is imperative that extreme care be

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expected to discharge is lower than the used in conditioning the seat surfaces, insuring 750 P.S.L mentioned above, the water correct alignment, and establishing the proper temperature in the loop can be reduced clearances, so that mechanical causes of simmer accordingly, will be reduced to a minimum.

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ORAIN LINE CONNEQTION OUTLET PIPING TO C

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SUPPORTED SO AS TO REllEVE VALVE y

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INLET PIPING AS l

SHORT AS POSSIBLE AND EQUAL TO SIZE 0F YALYE INLET.

I FIG.1 - Example Of Good Installation TJ "

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In some cases where the valve closes from a 9.

Place disc holder assembly in a "V" block Iow lift, but otherwise operates satisfactorily, the and usa an end mill in 1/4" diameter hole to w

disc, being free to swivel and rock through a small smooth upset locking thread. Fig. 3.

angl seatm,e, will flutter against the seat damaging the

10. Place bellows assembly tool vertically in vise g surfaces buzzm, g sound',. This produces a characteristic Fig. 3A. Place bellows, bellows housing disc,

. It can be corrected by raismg the lower ring one or two notches, causing the and dise holder assembly over assembly tool a

valve to close from a slightly higher lift. If the and lower to engage tool pins. Fig. 3B. Use c lower rmg is set at too high a position, the valve a strap wrench and turn dise holder counter

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will have a long blowdown and may close from a clockwise to remove disc holder and disc high lift, with possible seat damage.

from bellows housing.

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11. Lift out guide, top ring, and upper ring j The 2romN should be raised to reduce the blowdown and lowered to increase the blowdown, assembly.

g five notches at a time being considered a good

12. Determine lower ring position by placing a T

average change. One notch will produce approxi-flat lap on bushing seat and raising the ring 4

mately a two pound change in blowdown through-until contact with lap has been established.

4 out the 3Fo to 4Fo range.

Record the number of notches for positioning 3

during assembly.

9 In attemptm.g to obtain blowdown on the y

order of 3Fo, it is important to be sure that the MAINTENANCE 3

rings are not separated so as to lose control of e

the valve. The first indication of reaching this cor-It is not necessary to remove 3bnnow@

i dition is a slow up-and-down " hunting" action (f flanged or welded valves from the boiler for any the valve immediately before closing. If this action maintenance. The actual maintenance required is occurs at a blowdown longer than desired, moving generally confined to touching up seats and oc-both rings downward a small amount will some-casionally replacing the disc.

Nn thh adju The following tools are recommended for this t,

twice as many notches as M1 Ems work A.

Flat lapp 6g plate (Part No. VH-272).

Check the ring pins to see that they engage B.

Grinding compounds (Kwik Ak - Shun the rmg grooves, but without touching the bottom.

Grade No.1000).*

'rhe pins should not bear against the rings.

C.

High temperature lubricant.

MTM DO NOT AT1'E31PT TO ADJUST THE (Never-Seez)"

F D.

Bellows assembly tool.

E.

Three ring-laps per valve.

I DISASSEMBLY For Parts Identification Refer to Fig. 2 RING LAPS 1.

Remove six cap stud nuts, then lift cap and Orifice No. Is Fourth Digit Of Type No.

lifting lever assembly from valve.

(A 31739WA Valve Has A #3 Orifice) 2.

Loosen compression screw lock nut. 31 ark the orme. No.

Part No, position of the compression screw and count

1. 1 1672806 LAPPING CoMPCUND the number of turns required to barely re-

1. 2 1672807 Kwik.Ak. shun (Grade 1000) move all of the spring compression. This

1. 3 1672808 she can par, N, procedure will facilitate later adjustment of

1. 4 1672810 1 Lb.

199-11 the valve to near its original set pressure.

1. 5 1672809 2 Oz.

199-12 3.

Remove release nut cotter pin and unscrew release nut from spindle.

4.

Remove bonnet stud nuts and lift bonnet from valve body.

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Lift spring and spring washers, as an as-

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Lift support plate and floating washer as-1 l

sembly from body.

Ring or seat Lap e

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Lift spindle to engage lift stop with bellows housing and gently raise dise holder, bellows h e[, I, D)

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Place assembly in upright position and lift Pittsburgh, Pa.

,3 spindle to engage dro,p-out threads. Rotate

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spindle counter-clockwise to disengage from

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J-A4 dise holder and bellows assembly.

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C npression Screw Top Spring Washer Assestly I

Bonnet Bottom Spring a

[ Floating Washer t Stop Nasher Retainer Retainer Cap Screw 9

Bonnet Stud

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Support Plats Gasket

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" '"#'1"' 5 Guide Gasket kg;-

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Guide

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Top Adj. Ring Pin & Gasket 4'

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8ellors Assembly Upper Adj. Ring Pin & Gasket a

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ell of these tools can be procured from the H.

To check ri.hg bps for flatness, wipe all com.

factory prices on application. It may not be neces-pound off the lapping plate and ring lap. Then sary to 'Ise all of the ringlaps at any one time, use a figure 8 motion of the ring lap on the but having a sufficient supply on hand win save lapping plate. If the lap is flat there will be the time. af, reconditioning them during. a boiler no shadow; if there is a shadow, coat the lap-

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outage. After the unit is back in service, the rihg-ping plate with compound and lap the ring laps should be reconditioned on the flat lapping with a figure 8 motion covering the lapping plate, or returned to the factory for recondittomag plate to remove the shadow. Illustration B.

at a nominal cost, on a speciallapping machine. A LAPPING PLATE RING LAP lap should not be used on.nore than one valve without being reconditioned.

-r-Valves that have been leaking should be dis-

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recorded, the rings can be disassembled for clean-

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with a flat cast iron ring-lap coated with Grade No.

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equivalent.

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LAPPING PROCEDURE 3

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The following precautions and hints win

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enable anyone to do a " Professional Job of Lap.

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ping" Keep work clean.

seats:

A.

Illustration B B.

A lap.should not be used on more than one valve without being reconditioned.

L The seat now shan be thoroughly cleaned, Apply a very thin layer of, compound to the using a lint free cloth or tissue paper.

C.

Jap, this will prevent rounding off the edges of the seat.

If dedve hppbg of the Whbg seat is D.

Lap, using a reciprocating motion in all direc-required, a great deal of time will be saved if a tions at the same time applying uniform pres-Roto. Lap is used. See instructions for assembling sure and rotating the Lap slowly. Care should and operating the Consolidated 3 Maxiflow@ Roto-be used not to run off the seating surface with Lap Machine. Section IIL the lap as this will cause the seat to become uneven. When lapping the disc seat the Lap Referring to Fig. 4 it will be noted that the should be held stationary and the disc moved seat step is.025. If this step is reduced to.010 due as above with care taken not to strike. the cone to lapping, it should be remachined to the proper of the disc as this would cause the seat to be dimensions. For this purpose there is available for high on the inside.

use by the Consolidated 3 Service Department a "Rcseating Machine which eliminates the need to E.

Replace the compound frequently after wiping unit. This machme is remove the valve from the,de retaining plate and

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off the old compound. Greater pressure put mounted in place of the gui

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on the lap will speed up the cutting action of cuts' t'te top face, inside diameter and outside the lapping compound.

diameter of the bushing to establish the correct F.

To check the seat, remove all compound from heigl t relationships and angles.

the seat and lap. Then using a dry lap and the same lapping motion as above described SPINLLE RUNOUT the low sections of the seating surface win sPow up as a shadow in contrast to the shiny It is important that the spindle be kept very p : tion. If shadows are present, further lap-straight in order to transmit the spring force to r.ng is necessary. Only laps kno,wn to be flat the dise without laterial binding. Overgagging is should be used, as only a few mmutes will be one of the common causes of bent spindles. A required to remove the shadows.

method to check the essential working surfaces of G.

When the lapping is completed, any line ap-the spindle is illustrated in Figure 5.

peat 'as cross sen.tches can be rememi by Clamp a V block (A) made of wood, fiber or r;tating de Lap which has been wiped clean other suitable material onto the platform railing.

af compound on the seat about its ov,n axis.

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il LOWER RING UPPER RING ti HOLDER TO SEAT HOLDER TO SEAT

!l ORIFICE IN NOTCHES

.IN NOTCHES 4,, ; y; 1

7 10 2

8 12

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12 16

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12 16 4

12 16 SECDON x-x 6

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30 45 8

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a} g M g. 5 Mgure 7 - Adjusting Ring Positions Lift Stop to. net Stug Stud tat a Flesting fasher letat.or Cap !cre.

P II father tetainer W

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fupport Ptsta & Evide tasket Disc Holder 1

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" Imbed the ball end of the spindle in a piece of-

~ Step I. Rotate t spindle. until' spindle threads 7

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soft ' ood (B) and place Too of Spindle below the drops out of dise nut threads and makes w

threads, in V block (A). Clamp a dial indicator contact with the bellows seating plate.

onto the railing and locate at point (C). The total Step 4.

Place spindle, bellows, and dise holder Indicator re,ading should not exceed.0,03 when assembly into guide and lower gently the spindle is rotated.,

until disc contacts bushing seat.

Other parts of.the spindle not used as work-Step 5.

Lower support plate, floating washer as-ing surfaces may run out considerably more than sembly into position on top of bellows

.003 but this should not be regarded as an indica-flange.

tion of crookedness or faulty manufacture.

The replacement disc has been lapped on our LIFT ADJUSTMENT speciallapping machine and requires only that the Remove cotter pin from lift stop and spindle.

seat be touched up. However, the seating plate Raise lift stop until contact with support plate is bearing surface must be checked for proper con.

established.

tact in the pocket,of the new disc. This can be Lower lift stop one notch at a time (ONE checked with Prussian Blue. Both parts must show an even contact at least 3/16 wide.

NOTCH =.010 lift) until required lift is established (VALVE LIFT IS STAMPED ON NAMEPLATE).

Place bellows assembly tool vertically in vise After adjusting and securing lift stop in its and lower bellows over tool to engage the two proper position, the following procedure must be locking pins.

followed. Fig. 6.

Apply hibricant Never-See: to nose of bellows, Lift spindle, support plate, bellows and disc place disc in position on nose then thread disc bolder as an assembly out of guide. Caution: The

, holder onto assembly and tighten with spanner bellows will withstand the weight of the support wrench.

plate but may be damaged if support plate becomes To lock disc holder, disc and bellows, use a jammed and additional force is used to lift the assembly.

small punch to upset threads through the 1/4

hole in disc holder. Fig. 3.

Remove the support plate from the spindle, bellows and disc holder assembly bemg careful to protect the bellows and disc from damage.

ASSEMBLY Lift the clide and ring assembly cut of valve body and install the lower guide gasket in the

" Lowe* Ring: To position the lower ring place a body.

straight edge on~the seat, then bring the ring Replace the guide and ring assembly in the by turning clockwise until contact is made valve body and install the upper guide gasket in with the straight edge. (Ring is now on the the recess on top of the guide.

same plane with seat). Back ring down from Place spince, bellows and dise holder as-seat one notch for every 200 pounds of set sembly into guide and lower gently until disc con-

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pressure.

tacts bushing seat.

Example: A valve set at 2400 pounds shall be Install lower support plate Rasket on top of bellows flange an,d lower, tion on top of bellows s,up; c : plate, floatm, g 12 notches below the seat. Install Ring Pin.

washer assembly mto posi Upper Ring: Install guide and ring assembly in valve and measure from the top of guide to flange. Place second support plate gasket into re-the seat. Remove assembly from body, then cess on top of support plate.

set 'the ring using the same measuredient as Check all three ring pins to make sure that the overall length from the top of the guide each pin has adequate engagement in ring notch to the bottom of the ring.

but must not bind ring.

Ring pins must have pin gaskets installed Top Ring:. Raise top ring to cover vent holes com-when checking for ring engagement.

pletely then back ring down one quarter turn Lubricate spindle beanng with Never-Seez and to partially uncover holes.

lower bottom spring over spindle.

CAUTION. TO ADJUST OR CHECK THE POSI.

Lower spring and upper washer over spindle TION OF THE LIFT STOP THE FOLLOWING and seat spring firmly on bottom washer. Lubri.

STEPS MUST BE PERFORMED "WITHOUT" cate top washer bearing.

THE SUPPORT PLATE GASKET OR GUIDE Top spring washer pin is used to prevent ro-GASKETS IN PLACE.

tation of spring and washers when an adjustment is mad s

res e.

Step 1.

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id and rings as an assembly must be taken to insure proper engagement of Step 2.

Lubricate spindle tip with Never-Seez washcr pin in bonnet groove.

and place spindle into bellows housing, Install bonnet stud nuts and pull down evenly disc holder assembly.

until tight.

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Section 11 ROT 0-LAP MAGilNE iJ UUJWJU W # "

INSTRUCTIONS FOR ASSEMBLI two sets of four Laps each, Item 10. Kits for :3

& OPERATING THE CONSOLIDATED @

and e4 and =5 orifice valves include one set of MAXIFLOW@ ROTO. LAP MACHINE four Laps, Item 10, and one set of four larger or GENERAL DESCRIPTION alternate Laps, Item 11.

The Consolidated @ Maxiflow@ Roto. Lap Ma-ASSEMBLY chine is a hand operated tool for refimshing Proper assembly of the Roto-Lap can be ac-damaged or worn nozzle seats in Consolidated @

complished by referring to Fig. 8. The mounting Maxiflow@ Safety Valves. It has been expressly Flange, Item 6 has three sets of four holes each:

developed for the pur70se of generating a flat the inner set marked 1-2; the center set marked surface and its use rnaterially reduces lapping 3 and the outer set marked 4-5. First select the set time.

of marked holes corresponding to the size of the The Roto-Lap will not correct a seating sur.

orifice to be lapped and insert the Should'er Screws, face which is out of square with the valve center Item 7, downward through these holes.

line, nor will it reshape the original dimensions of The orifice size can be identified by referring the nozzel seat. For either of these purposes, a to the valve type number stamped on the valve special reseating machine is required or the valve nameplate.

must be removed from the boiler and the base and The third digit in the type n Imber is the bushing assembly remachmed.

valve orifice size or number. As an example, if the GENERAL NOTES valve is Type 1747WA, the third digit, #4 is the orifice size or number and the Shouldered Screws The Maxiflow@ Roto-Lap Machine is made up would be inserted in the set of holes marked "4 5" of parts as shown in Fig. 8. A duplicate Bill of on the Mounting Flange.

Material is also pasted inside the cover of the Next assemble the four Lap Gear Washers, carrying case.

Item 8, four Lap Gears, Item 9, Center Gear, Item A Mounting Flange, Item 6, fabricated with 5, and Laps, Item 10, in this order. The shoulders on the Shoulder Screws should seat against the three sets of four holes on three diameters is pro-recesses in the top surfaces of the Laps. An Allen vided for use on all valves with orifice sizes el

' thru #5. Kits for #1 and #2 orifice valves inclu le Set Screw wrench is provided for tightening the Shoulder Screw to the Lap. Each Lap, Lap Gear Vg 7,,,,,.2, T

and Shoulder, Screw assembly should rotate freely y-in the Mountmg Flange.

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The Center Gear must engage in all four Lap D2fMyt Gears and must be in place before the Laps are M47,*'

4 assembled to the Shoulder Screws. When properly y

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• Ot-assembled, the Center Gear should " float" in the k

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space between the Laps and the Mounting Flange.

D,h Attach the Handle Asscmbly to point "Y" on l h.

the Mounting Flange spud by means of the Allen g, s y %-

Set Screw provided.

c:

Place the Bore Guide, Item 2, inside the bore LN@

f of the safety valve seat bushing or nozzle and tq l

g.- -

c j

p. A

]

g -%yV push it down as far as it will go. The top of the

'\\.

flange, point "R" must be below the seating sur-F )-

face of the nozzle. A small amonit of light oil on i

E Uo T /*'

the "O" Ring, Item 3, will assist in getting the G

guide nto this position.

i USE

~

Where two different sizes of Laps are pro-

_d vided, tne larger set will cut faster than the h

m s'

/.

smaller and should be used for removing nicks and ether severe damage. The smaller set of Laps cuts e 3- ~ <

A%m-A

", 2 ;,M//Z slower and is better for finishing the seat surface.

S W

m. c. "' **

Apply lapping compound to the lower face In of each of the Laps. Normally 1000 grit grinding

/

N<

/.

compound similar to KWIK-AK-SHUN Grade

=1000. should be used. However, a heavier grit

'j compound may be used where necessary. A small amour.t of oil placed on the Laps with the com-TTg. 2-Nomenclature Roto Lap Machine Pound will produce a better finish.

,/

10 C

4 Drop the Slounting Flange kssembly over the the seat as !apping progresses, and is easily re.

Bore Guide extension shaft so that the shaft placed for further lapp,ing if necessary. Also, the passes through the Center Gear and into the center Bore Guide, remaining in the bore througliout the hole in the 31ounting Flange. TURN THE HAN-entire operation, prevents foreign material from DLE CLOCKWISE slowly until the Key, Item 4, falling into the boiler.

engages in the keyway in the center Gear and After the removal of nicks, etc., the surface presents its further rotation. At this point, the finish can be improved if the surplus compound Laps wt11 drop onto the seating surface. Further s w ped away from both the nozzel seat and the rotation of the hand,le causes,the Laps to move laps and the lapping continued with a minimum in a planetary fashion, rotating as they travel amount of compound. Final finishing should be around the seat. Lap by turning CLOCKWISE un-done with a new hand lap, using 1000 grit com-til the desired finish is produced.

pound to insure minimum deviation from a per-You will note that the 3Iounting Flange As-fectly flat surface. Ring laps are provided in the sembly lifts off easily for periodic inspection of Roto-Lap Kit for this purpose.

s

.J 11

1566 HYDROSET '

SECTION 111 One Yoke, Fig. 9 1566 HYDROSET TESTING DEVICE One Turnbuckle each, Fig.10, for the various FOR SETTING CONSOLIDATED @

stzes One Hydroset Unit MAXIFLOW@ VALVES Pump, pump hose and fittings.

Setting safety valves by the usual method of METHOD OF ADJUSTING VAL.VES lifting valves under steam pressure presents a To use the setting device refer to Fig.11 fc'-

number of problems. In high pressure convention-al boilers superheater tubes may be damaged if the following procedures.

the turbine is not operating. Also, the expense of Remove lifting gear and release nut from top feed water, fuel and personnel involved is con.

of valve and its spindle.

siderable. If safety valves on conventional units are set with the turbine in operation, a procedure Place Hydroset yoke on top of compression necessary for all,once through boilers, large load screw and place turnbuckle on spindle making one ebany2s occur with the rapid pressure changes revolution to engage spindle thread.

that occur.

Turn the turnbuckle clockwise fully engaging the left and right hand threads. The turnbuckle Although these problems cannot be elimi.

should not be tightened, but should be merely cated entirely, they can be lessened by using a finger tight. When the turnbuckle is prope,rly en-hydraulle device to assist the steam pressure under gaged, the top of the piston will be approxunately the valve seat to be in balance with the opring even with the bottom of the bevel on the upper compression above the valve seat.

flange, and the lower flange will rest on the top f the yoke. 7 Accuracy of results obbined by the use of this The chart used in the test is made up with a device depends on several factors. First, friction differential between desired set pressure and act-has been entirely eliminated as a source of error so that for a given pressure the Hydroset repeat-ual steam pressure.

edly produces exactly the samelifting force. Gauge Referring to the chart, Fig.12, the valve accuracy and variation in effective seating area is to be tested in,the following manner. Starting between valves of the same size and type will aMo with a predetermined boiler pressure, the Hydro-affect accuracy. With well calibrated gauges and set pressure required is determined by the inter-valve seats in good condition, accuracy on the section of the lines of the required set pressure order of 1% may be expected.

and Hydroset pressure.

EXAMPL'i: With a boiler pressure of 1500 This method has been approved by the PSIG and a required set pressure of 2500 PSIG, A.S.M.E. Code Committees.

follow set pressure line (indicating difference be-tween 2500 and 1500 or 1000 PSIG), vertically to intersect with the desired orifice size curve. The EQUIPMENT Hydroset pressure required then can be read on the left side of the chart. In this example for a The components used in hydraulically adjust-31739 valve, the Hydroset pressure will be 520 ing the set pressure of CONSOLIDATED @ Maxi-PSIG.

flow @ Safety Valves consists of:

'h 0

aem O

}a i

I OJU_u_1.

g a

_1 w.

se' Ns e,

y e

^ NY i 1.

t

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a T

m r.

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I d.

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1

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m,.

1 n..... n m.

s p

m I

Fig.10 Fig. 9

'eb

') } [

12

\\

s

~

A SATISFACTORY PUMP IS THE ASHCROFT MODEL 1:27 WITH A CAllBRATED GAUGE SulTABLE FOR THE A.lTICIPATED SETTING REQUIREMENT.

Gauge' J

(Supplied By

/

Customsr)

N-2~1/ 2'"

REQ'O. DIN. fbR INSTALLATION

[-$ V I

16-1/4 Hydroset

/ [Q N g urnbuckle i

12-1/4" 7 ake Y

o (T"T)

(TT) 1 CONSOLCATED

/

f_ _ _ _ ;

NOTE: GAUGE CONNECTION TAPPED 1/2-14NPT HOSE CONNECTION TAPPED 3/B-18HPT o

Pump PUMP, HOSE ANO flTTlHGS SUPPLIED BY CUSTOMER.

NYORAUllC FLUID SHOULO BE'A PETROLEUM BASE FLul0.

" CAUTION" 00 NOT USE BRAKE FLUl0.

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14

s To determine the pressure setting of the After Hydroset pressure of 520 PSIG and valve, increase the hydraulic pressure to the valve valve opening occur simultaneously, reduce Hydro-that causes the valve to " spit" or simmer. This set pressure to zero and recheck setting by raising pressure can be readily noted because of the Hydroset pressure to 520 PSIG.

abrupt downward deflection of the pen occurring at the time the valve spits or simmers.

(NOTE) The 2000 PSI appearing on the Hydroset Unit is in effect the upper limit to wi:ich this unit If Hydroset pressure is greater than 520 PSIG, should be subjected. Continued use of the unit in follow the above procedure except to reduce pres.

excess of 2000 PSI will probably damage the smal.

sure turn compression screw counter clockwise.

Ier bellofram.

REPLACEMENT PARTS SKTION IV Replacement Parts Dresser-Industrial Valve & Instrument Divi-sion, maintains the largest field service staff in When it becomes necessary to order replace.

the industry. Service Engineers are located at ment parts, the order should state:

strategic points throughout the United States to respond to customers' requirements for service.

1. Part name Each Service Engineer is factory trained and long experienced in servicing Safety Valves. Our Serv-

2. Valve size ice Engineers restore disc and nozzle critical di; mensions which affect valve performance, and are

3. Valve type capable of modernizing valves in the field.

4. Serial number of valve The following spare parts are recommended:

5. When ordering spring assemblies, also state the desired set pressure.

1. Dise for 50% of each type and size drum

• • IV' Refer to Figure 2,Section I, for part name.

All other required information will be found

2. Disc for 100% of each type and size super-stamped on the nameplate attached to the body of heater valve the valve.

3. One set of adjusting rings for each type In addition, the serial number is stamped on and size superheater valve the top edge of the outlet flange. Be sure to in.

clude the one or two letters preceeding the figures

4. One set of ring pins for each type and size in the serial number. A typical valve nameplate valve is shown in Figure 14 FACTORY REPAIR FACILITIES If boiler downtime permits, it may be desir-

=g able to return the valves to the factory for repair W;e r. U.f Mm eM;= '

[

s.nm. m w c _

T or modermzmg. The factory at Alexandria, Louisi-

......w.o m m.

,,a.

. gj ana maintains a complete CONSOLIDATED @ repair M F 1 0!M 2." 2 l % # 6 center. In addition to factory production stock, the 31739

• • TE'1 BJ0000 f repair center utilizes its own stock room. Most 2 1/2 g:.,.,;::,;g 1.800 17 important, this enables the tactory to make return 29760 (r BOf=3h SAT..

shipment of repaired valves withm forty-eight 2500 e

.g 75 i m

.m j

(48) hours after receipt of customer's purchase

%@ ht y 450 g order.

Each valve is tested and adjusted on CON-SOLIDATED@ 2500dt steam test boiler. Final Fig.13 testing is witnessed tiy quality control inspection as being properly set and adjusted in accordance with the ASME Power Boiler Code.

FIEl.D SERVICE NEW VALVE WARRANTY Utilities expect and demand service on 4 mo.

ment's notice. Should'it become necessary, utili.

Both factory and field repaired valves carry ties can depend on CONSOLIDATED 3 Field Ser.

a warranty, which covers workmanship and new vice, even on extrene off hour emergency parts installed during repair, for a period of one situations.

year from date of repair completion.

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OUTLET FLANGE e

ll 2

ROUND TOROUE IW FT. LBS.

O O

d5

'O O'

2 85 3

1 45 5

25 9 O O'

~

eROCE0uRE 1, Rr1ER TO TABLE AB0VE FOR TOROUE FT is. VALUE FOR APPLICABLE ROUND 5O O,

O O

2. TOROUE EACH HUT IN SEQUENCE SHOWN I flGURE I TO APPLICABLE TOROUE FT.Le i

12 T

VALUE.

3 PROCEED WITH NEIT ROUNO IN ACCCROANCE WITH STEPS I & 2.

lHLET "

flCURE I SEQUENCE FOR TORGUE APPLICATION TO OUTLET NUTS NOTE NUNSER STUD 10.000PSISTRE;S Fl.ANCE TYPE OF STUDS THREAD FT/lt3S ' TORQUF THAT VALUE REQUIRED TO MAKE S - 600:

17 1 - BUNC 245 A TICHT FLANGE 101.4T.

NO C0dSIDERATION HAS BEEN GIVEN TO LOA 0 LNG WHICH HAV BE REQUIRED TG ALICH PIP!NG OR ACCOW00 ATE THERMAL PIPlNG STRAl.15 TOROUE VALUES APPLY ONLY TO SPIRAL #0VND GASXETS WITil WETAL TO NETAL 10ldT CONTACT' 7,1 ',

7 9 f)

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fg 9 OUTLET FLANGE Bolitric CHART o

D) 9Ti 31700 PRESSURIZER SAFETl g

{n VALVES ASWE SECTI0d III.

5 B5 ro$ D $ h 0

lNLET FLANCE TOROM IN H. b S.

ROUND l l S-8UNC l 1 4-Bt!NC I

O O

- 1 60 80 2

~

2 u0 na 3

100 260 3

.Q B 4

270 370 5

355 500

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PROCEDURE 5Q gQ 4

!. REFER TO TABLE AB0VE FOR TOROUE FT LB. VALUE FOR APPLICABLE ROUND

~

2. TORQUE EACH NUT !!! SEQUENCE Sl!0h'N IN FIGURE I TO APPLICABLE TOROUE FT. LB i

8 YALUE.

3. PROCEED WITH HEXT ROUND IN ACCORDANCE WITH STEPS I & 2.

00TLFT FIGURE I SEQUENCE FOR TORQUE APPLICAT!0N TO INLET tuts s

NOTE NUMBER STUD 30,000 PSI STRESS FLANGE TYPE.

OF STUDS THREAD FT./LBS _ TOROUE i TOROUE VAldES ARE PURELT THAT VALUE REQUIRED TO HAKF 2 I ~2 - 2500*

8 1-1/8-BUNC 355 A TIGHT FLANGE JOINT H0 COCIDERATION HAS BEEN GIVE t 3-7500s 8

l-1'4-80HC 500 TO LDA0lHG,WHICH WAY BE REQUIRED TO ALIGN PIPlilG 1R ACC0400 ATE THERWAL PIPING STRAINS TCRQUE VALUES APPLY ONLY TO SPIRAL WOUND GASKETS WITil WETAL TO METAL JOINT CONTACT.

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O INLET FLillGE BOLTING CilART

[ b a OJ 31700 PRESSUR12ER SAFETY O

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W*TTED STATIS T

THE DRESSER FIELD SERVICE ORGANIZATION IS UNEQUAL.ED.

For prom Division, pt field service, please call Dresser Industrial Valve & Instrument Service Department, Alexandria, Louisiana.

All hours. Area Code 318 445-5381.

f Alexandria, La.

1 Boston, Mass.

2 Bridgeport, Conn. 3 Location of Service Men chicago, litinois 4

Tulsa, Oklahoma 5

g p

Los Angeles, Cal. 6 0

Baltimore, Md.

7 (g g f Columbus, Ohio 8

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222