tips rapidos de sporlan.pdf

8/12/2019 Tips rapidos de Sporlan.pdf

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T h e p u r p o s e o f t h e e x t e r n a l

equal izer is to sense the pres-sure in the suct ion l ine AT THE

BULB LOCATION and tr an smi t

it to the TEV diaphragm.

This usual ly means ins tal l ing the external

equal izer immedia te ly down s t ream f rom thebu lb . This ensur es the cor re c t pre ssure is s ig-

n a led to th e TEV.

In some s i tuat ions this ideal locat ion may

not be poss ible . In these cases , an al ternate

Where should

the TEV External

Equalizer be

installed?

QuickTipsfrom Sporlan

# 1


2/24

locat ion, such as at B o r C ( s e e d i a g r a m ) ,co uld b e u sed. However , it m ust be co nfirm ed

that the pressure at these locat ions is near ly

ident ical to the pressure in the l ine where the

bu lb is loc ated.

In o ther word s , loca tion s B a n d C are acce p t-

able as long as these pressures are essent ial ly

the sam e as A when the sys tem is op er at ing at

fu ll loa d .

In the pas t the re has been concern abou t

ins tal l ing the external equal izer up-s tream

from the bulb. This was due to the poss ibi l i ty

of refrigerant leaking past the TEV push rods,

pa ss ing thr ou gh the eq ua lizer line an d into the

suction line, thus falsely influencing the TEVbulb temperature. Today, with Sporlans TEV

d esign, this p o ssibility is virtua lly elim ina ted .

EVAPORATOR

C

A

B

TEV

COMPRESSOR

A Reputation Built on Q uality

Sporlan Valve Company206 Lange Drive Washington, MO 63090

Copyright 1999 By Sporlan Valve Company


# 1


3/24

Sporlan Catch-All

Large Amount ofDesiccant Molded into a

Porous Core

Final Safety Filter Consistingof a Fiberglass Pad and

100 Mesh Screen

The Perfect Filter-Drier

What makes

the Sporlan

Catch-All

different?

Th e fam o u s m o ld ed p o r o u s co r e .

The Sporlan Catch-All Filer-Drierel iminates al l the weaknesses of

loose-fi l led models by molding a

b l en d o f s p e c i a l l y s e l e c t e d

desiccants in to a porous co re .

The co r e p r o vid es exce llen t fil tr a-

t ion without the poss ibi l i ty of d e c i c c a n t p o w d e r i n g , p a c k i n g

an d e scap ing into the sys tem .


# 2


4/24

What are thefunctions of

the Catch-Alls

special blend ofdesiccants?

Removes Moisture - Mois tur e is an imp or -

tant factor in the formation of acids, s ludge,copp er p la ting and co r r os ion .

Re mo ve s Dirt - Num er ou s meta llic con tam -

inants such as cas t i ron dust , rus t , s teel and

co p p e r ch ip s can d amag e co mp r es s o r b ea r -

ings and plug capi l lary tubes or expansionvalves.

Removes Sludge and Varnish - Although

the u tmos t precaut ion may be taken in the

design and fabr icat ion of a sys tem, once inop er a tion , un usua lly h igh d ischa rge tem per a-

tures wi l l cause the o i l to break down and

for m s lud ge a nd var n ish .

Removes Acids - Acid-forming chemical

reac t ion s can o ccur un der ce r ta in co nd i tion s .

As an example, a t e levated temperatures ,

many refrigerants will react with oil to formacids . This is pa r t icu lar ly tru e wh en m ois tur e

is present .


# 2





5/24

From the s tandpoin t

of ind ica t ing thecond i t ion o f the

r e f r i g e r a n t ( 1 0 0 %

liquid or mixture of

liqu id and bu bb les)

the preferred loca-

tio n is immediate lybe fo re the TEV.

T h i s r e c o m m e n d e d

posi t ion is for the

benefi t of assist ingin th e a n alysis o f sys-

tem per for m ance when ser vice is req ui red . By

being cer ta in tha t no bubbles a re present

whe n the r efr iger an t enter s the TEV, i t ca n b e

establ ished that one of the requirements for

pr op er TEV op er at ion ha s b een satisfied .

Also, in th is po sition it ca n b e d eter m in ed tha t

the s ystem is sufficien tly ch ar ged with r efr iger -

an t. With the See All b eing do wnstre am o f th e

Catch-All, it will signal a restriction in theCatch-All due to large quantities of dirt i t may

have collected. However, be careful not to

co nfuse this with a sh or tage o f ch ar ge.

FORUSEONREFRIGERATIONand/or

AIRCONDITIONINGSYSTEMSONLY

SPORLANVALVECOMPANYWASHINGTON,MO63090

MADEINU.S.ofA.

W.P.500psig(3447kPa)

TYPE

C-163-SLISTEDREFRIGERATIONFILTER-DRIER407G

FORUSEWITHR12

R22R5005502R134a

Preferred Location

Moisture andLiquid Indicator

Filter-Drier


#3





6/24

F r o m t h e s t a n d p o i n t o f

i n d i ca t i n g t h e mo i s t u re

co ntent , its loc ation can be

an ywhe r e in the liqu id l in e.

This is because the level of

mois ture conta ined in therefr igerant reaches equi -

l i b r i u m so o n a f t e r t h e

installation of the Catch-All

and shou ld remain a t t ha t

l eve l un less mois tu re i si n t r o d u c e d f r o m s o m e

exter na l sour ce . Ther efor e ,

the See All cor r ect ly m ea-

su res the p roper mois tu re

concentrat ion at any point

in the liqu id lin e.

The Spo r lan See All is a co m bi-

na tion m oistur e an d l iqu id indi-

cator. Therefore, i t serves two

functions when instal led in the

liquid line.

FORUSEONREFRIGERATIONand/or

AIRCONDITIONINGSYSTEMSONLY

SPORLANVALVECOMPANYWASHINGTON,MO63090

MADEINU.S.ofA.

W.P.500psig(3447kPa)

TYPE

C-163-SLISTEDREFRIGERATIONFILTER-DRIER407G

FORUSEWITHR12

R22R5005502R134a

Filter-Drier

Moisture andLiquid Indicator

Where should the

Sporlan SeeAll

be installed?

Satisfactory Location


#3


7/24

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Loc ate the bu lb on a s t raight , hor i-

zontal l ine, pitched slightly down,

im m ed iately after it leaves th e e vap -

ora tor .

A short t rap should fol low before

the ver tical line r ises to be co nn ect-

ed to the com pr essor suct ion . With

the l ine pi tched down, any l iquid

re fr igeran t and /o r oi l will pass into

the t ra p, away fr o m th e b ulb. As the

trap fills with oil, the velocity of the

refr igerant wil l carry the t rapped

oil into the vertical section and be

re tu rned to the com pr essor.

In gene ra l, the TEV bu lb sho uld b e

ins tal led on a straight sec t ion of

horizonta l suction l ine.

Where should

the TEVs bulb

be located?

To Compressor

When the compressor isabove the evaporator


# 4


8/24

Observing the same pr inci-

ples ou tline d ab ove, the pip-

ing should be ar ranged to

prevent the accumula t ion of

oi l and/or refr igerant a t the

bu lb loca t ion . Also , t r aps

installed in the suction l ines

of evap or ator s B a n d C p r e -

vent the f low of refr igerant f rom one evaporator f rom enter ing

the suc tion line of an other wher e i ts bu lb is loc ated.

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In this p ip in g co n figur a-

tion , no t rap is req ui red

af ter the bulb locat ion,

but the l ine should be

pi tched s l ight ly down

to p reven t any l iqu id

refr igerant or oi l f rom

b e i n g t r a p p e d a t t h ebulb locat ion .

When the com-pressor is below

the evaporator

ToCompre

ssor

When several evapo-

rators are installed

both below and

above the common

suction line

To Compressor


# 4





9/24

Except for very small sizes, mostd i r e c t e x p a n s i o n e v a p o r a t o r sused in r e f r ige ra t ion and a i rcondit ioning systems use two or

more c i rcu i ts . In order for theev ap o r a to r t o p e r f o r m a t i t s

m axim um cap aci ty, equ al refr igeran t feed to e ach circu itis a n ece ss ity. In ad di tion , each circu it mu st be expo sedto ide nt ical he at loa ds .

Distributing equal amounts of liquid to each circuit isim po rtant in re friger ation evap or ators b ecau se the r efrig-er an t lea ving the TEV is a mixture of l iquid and vapor.Ther e is a na tur al tend enc y for the liqu id and vap or to sep-arate, resulting in unequal amounts of liquid being fed tothe var io u s circ u its. It is th e liq u id r efr iger an t flow in to theevap or ator th at pr od u ces n ear ly all the r efr igera tio n e ffect.Th e vap o r co n tribu tes ver y little.

To ensure equal refrigerant feed, i t is important to s izethe dis tr ibutor nozzle and tubes to match the sys temcapacity as close as possible. By doing this , the properveloci t ies are created to completely mix the l iquidand vapo r .

What is importantin refrigerant

distributor

performance?

Correctly sized nozzleand tubes for velocityand mixing

Removable nozzle

100%Liquid

Liquid + Vapor


# 5


10/24

In ad dition to feed ing eq ua l am ou nts of liqu id a nd vap orinto each circuit to uti l ize the full capacity of the evapo-ra tor , eac h c irc ui t m ust be eq ua lly loa de d. FigureA isa sch em atic i llus trat ion of typical tem pe ra tur e c on dition sin the evapora tor when both equal distribution andequal loading occur .

FigureB illustra tes the sam e evap or ator bu t with the a ir

f low (and thus the load) less over circuit #3. The loadimbalance will be indicated by low superheat at the outletof circu it #3 , and high sup er he at at the ou tlet of circu its #1and #2. Other symptoms are lower than normal suct ionpressure, reduced evaporator capacity and TEV huntingwith possible flood-back.

Wh en p lan n in g a system r efr iger an t co n ver sio n i t is cr iti-cal to co nsider no zzle a nd tub e s izing.

For co m plete s izing an d ap plicat ion infor m ation r efer toSpo rlan Bullet in 20 -10.

10Superheatall circuitsfed the same

All circuits fed the same& loaded the same

#1 & #2 circuits"starved"20superheat

Circuits #1 & #2 moreheavily loaded(more air than #3)

0Superheat controls TEV possible hunting & flood back

Circuit #3 more lightlyloaded (unequal air flow)

FigureA

Figure B


# 5





11/24

I t i s n o t u n c o m m o n t o s e erefr igerat ion and air condit ion-ing systems that have operated

for decades without any servicebeing per formed and wi th theCatch-All undisturbed since the

original installation. This speaks well , not only for ther eliab ility an d d u r ab ility of all th e system op er atin g com -ponents, but also for the Catch-All which has provided

pr otec tion to these com po nen ts over the m any year s theyhave opera ted .

At the initial start-up the Catch-All removed any dirt orexcess ive mois ture that may have been in the sys tem.Dur ing the yea r s of o p er ation , th e Catch -All co n tinu ed toprovide pro tec t ion by insur ing tha t no ac id or contami-nants formed dur ing per iods of h igh condens ing or d is -char ge tem per a tu r es .

Unfortunately, things do not always go this smoothly andservice cal ls are necessary. This is when considerat ionsho u ld b e given to ch an gin g the fil ter-d r ier.

Here a re some ques t ions tha t wi l l he lp de te rminewhe th er to ch an ge the Catch -All:

1. Did the See All ind icate m ois tur e was pr esen t?

2. Was the sys tem op en du ring ser vice?

3. Wer e there any un usua l c irc um stanc es tha t cou ldha ve p er m itted m ois tur e to en ter the sys tem ?( ru p tu r ed c h ille r o r wa te r coo led cond enser ; we tcon di tion s in ar ea wher e rep airs a re tak ing p lace)

4. Was ther e a her m etic m otor bu rn -out involved?

5. Was e xcessive c om pr esso r he at in volved in the failur e?

6. Is the re fr iger an t oi l d iscolor ed o r fou nd to b eacidic? (A Sporlan Acid Test Kit will determine this)

7. Was it eviden t th at dir t , m etal chips o r o th erco ntam ina nts wer e involved in cau sing the fai lur e?

When should a

Filter-Drier be

changed?


# 6


12/24

Replaceable core Catch-All

Compact Style SuctionLine Catch-All

If the answer to any of these is yes, a new Catch-All isgood insur anc e agains t a rep eat pro blem . If qu es tion s 3 ,4 o r 5 are answer ed yes , both a suct ion line a nd liqu idl ine Catch-Al l a re recommended to remove ac ids andproducts of oi l decomposi t ion. Sporlan Bullet in 40-10ou tline s the pr oc ed ur e for this type of cleanu p.

Th e Sp o r lan See All an d Acid Test Kits ar e e xce llen tservice tools for determining i f a replacement of theCatch -All o r othe r filter-dr ier is re q u ir ed .

With the famous molded core

A combinationMoisture &LiquidIndicator

AK-3TA-1

ACID TEST KITS


# 6





13/24

One of the basic rules of physicsis that force is equal to pressure

tim es area ( F= P x A) . When aforce is appl ied to a movableobject, that object will move.However, if the force is opposed

by an equal force in the opposi te direct ion,th er e is no effec t on the p ositio n o f th at ob jec t.

The pis ton ( pin) in a c on ven tion al TEV de signis exposed to h igh in le t pressure on the topand low out le t pressure on the bot tom. Thepressure imbalance in a conventional TEVten d s to o p en the valve.

What is

different about

the Sporlan

O Valve?

Outlet

pressure

Piston (pin)

Inletpressure

Highinletpressure

inopeningd

irection

Lowoutletpressure

inclosin

gdirection

Portimbalanceis thedifference between inletand outlet pressure.

Portimbalancetends toopen the valve.

CONVENTIONAL TEV


# 7


14/24

T h e S p o r l a n b a l a n c e dpor t O Valve des ignb a l a n c e s t h e f o r c e sap p l i ed t o t h e p i s to ni n e q u a l a n d o p p o s i t edir ec tio n s. Th us, th e Type

O Valve eliminates theeffects of pressure dropacross the valve. A bal-anced port valve designis des irable and benef i-c ia l fo r sys tems tha texper ience a wide rangeo f l o a d a n d o p e r a t i n gcondit ions .

TYPE O VALVE

Outlet pressure

Piston

Inletpre

ssureacting

onsame

areaasport

Inletpressureacting

onareaofport

Push rod seal

Passagewayfor balancing

"Cup" seal

Inletpressure

Inletpressure


# 7





15/24

S p l i t - C o n d en s e r s a r e u s ed i nlarge ref r igera t ion sys tems toass is t in head pressure cont ro land to min imize the amount o f system re friger ant char ge req uired .

The s ize o f the condenser r equ i red fo r summer opera -tion is spli t into two parallel circuits . One circuit (desig-nated sum m er /winter) is ac tive in sum m er and winter.The o ther c i r cu i t (des igna ted summer condenser ) i srendered inact ive dur ing winter operat ion by a 3-WaySp lit Co n d en se r Va lve .

As the piping d iagr am in d ica tes, a ch ec k valve is installedin the out le t of each condenser c i rcu i t , and head pres -su re con tro ls a re u sed to m ain ta in m in im um and s tab lehead pressures . The two condensers are usual ly sp l i t50 /50 in s ize and a re con ta ined in the same tub e bu n-

dle us ing con den ser fan con tro l as a sup plem ent to thehe ad pr essur e c on tr ol valves . With this com binat ion , therequ i red r e f r ige ran t charge i s kep t to an abso lu tem i n i m u m .

What is a

Split

Condenser?

TYPICAL PIPING SCHEMATIC

SUMMER/WINTERCONDENSER

SUMMERCONDENSER

CHECK VALVE

CHECK VALVE

COMPRESSOR

ORD

RECEIVER

3-WAY SPLIT CONDENSER VALVE

ORI or OROA

1

1 Not used with OROA (B, C or D) for Head Pressure Control.


# 8


16/24

There are three sizes of Sporlan 3-Way SplitCondenser Valves with connection sizes from7/8 to 2-1/8 ODF. The B model is des ignedwith an internal bleed. This feature allowsre f r ige ran t to b leed f rom the summer con-de nse r b ack to su ct ion when it is ina ct ive du r -ing per iod s of low ou tdo or tem per a tur es .

ORDERING INSTRUCTIONS

8D 9 C SC

EPYT EZISTROP

)sehcnI(

C NOITCENNOredloSFDO

)sehcnI(

CS-B7D8CS-C7D8

4/3

8/7

CS-B9D8CS-C9D8

8/1-1

CS-B11D21

CS-C11D214/1-1

8/3-1

CS-B31D21CS-C31D21

8/5-1

CS-B71D61CS-C71D61

2 8/1-2

ValveType

* Also specify voltage and cycles *

SplitCondenser

Non-BleedVersion

Connectionsin 1/8

F o r mo r e d e t a i l ed i n f o r ma t io n , r e f e r t oSpo rlan Bullet in 30 -10-2


# 8





17/24

By changing cartr idges, a s ingleQ valve b o d y ca n b e e asily alter edfro m 1/ 4 to 5 ton s R-22 an d fro m

1/ 8 to 3 ton s on R-13 4a . Also, thecorrec t thermos ta t ic charge tosu it th e a p p lica tio n is installed at

the same time. These modifications can be convenientlymade either before or after it is installed on the system.

What are the

advantages of

the Sporlan

Q TEV?

Any of SporlanSelective Charges

7 Different CartridgesAll Color Coded and

Number Identified

Assortment of 3 DifferentBody Styles Externallyor Internally Equalized

STNEMELECITATSOMREHTDEDNEMMOCER

NOITACILPPA

TNAREGIRFER CITATSOMREHTTNEMELE

EGRAHC

POMMETSYS

gisp21 22

A704 a431 A104

A204705

A404A804205

C704 A904

RIAGNINOITIDNOC

x x x x 06PCF-34-TK 05

x x 001PCV-34-TK 09

x x AGV-34-TK

x 511PCR-34-TK 501

LAICREMMOCNOITAREGIRFER

05 F 01ot F

x x x x CF-34-TK x x CV-34-TK

x CR-34-TK

x CP-34-TK

WOLERUTAREPMETNOITAREGIRFER

0 04otF F

x ZF-34-TK

x PZF-34-TK 21

x ZV-34-TK

x 04PZV-34-TK 03

x x ZR-34-TK

x x PZR-34-TK 53

All Sporlan SelectiveThermostatic Charges


# 9


18/24

ODF(Externally

Equalized)

ODF(Internally

Equalized)

ODF(Externally

Equalized)

SAE(Internally

Equalized)SAE(Externally

Equalized)

ODF(Internally

Equalized)

Replaceable Strainer U.S. Patent

No. 5,232,015

P/N 3427-000

U.S. Patent

No. 5,238,219

SQE

QE

EQE

SQ

Q

EQ

nalropSfo)snot(yticapaClanimoNdecalpeRebotevlaV

egdirtraCevlaVQ

21-R 22-R 205-R a431-R A404-R EZIS EDOCROLOC

8/1 4/1 8/1 8/1 8/10 DER

6/1 3/1 6/1 6/1 6/1

4/1 2/1

4/1 4/1 4/1 1 WOLLEY4/3

2/1 1 2/1 2/1 2/1 2 NEERG

1 2/1-1 1 1 1 3 EULB

2/1-1 2

2/1-1 2/1-1 2/1-1 4 KNIP2/1-2

2 3 2 2 2 5 KCALB

2/1-2 43

2/1-23 6 ETIHW

3 5 3

7 CARTRIDGES

6 BODY STYLES


# 9





19/24

Ther e h as a lways been a tend en-

cy to select solenoid valves on

the b asis o f lin e size. This is ver y

risky.

While a 5/8 l ine s ize and a 5/8 ODF sweatconnec t ion sound l ike a perfec t match, o ther

fac tor s mu st be co ns ider ed.

The valve m ay be use d in the liqu id, d isch ar ge,

or suction line. A valve applied in the suction

line m ay h ave a c ap ac ity o f 0 .52 to n s, while the

same valve used in the liquid line would have

a capacity of 8 tons. Using an oversized valve

may mean the valve wont close properly, not

to ment ion tha t you probably pa id for more

valve tha n yo u ne ed ed .

Should a

solenoid valve

be selected

based on line

size?


# 10


20/24

The valve capacity and application shouldalways be th e d eterm ining factor s when select-

ing a solenoid valve. Use this five step process

to h elp m ak e th e co r r ect se lection ever y tim e:

1. type of refrigerant in the system

2.ap p licat io n: dischar ge, liqu id, o r su ct ion3. flow capacity required

4. line size

5.electrical sp ecificatio n s


# 10




E9

E9

E9

E9

For addit ional information contact Sporlan

Valve Company or your Authorized Sporlan

Who lesa le r and req ues t Bul le tin 30 -10.

LIQUID LINE - E9 CAPACITY 8 TONSR-22

R-22

SUCTION LINE - E9 CAPACITY .52 TONS


21/24

Befo r e lea ving the fac tor y, a sp e-

cif ic superheat sett ing is madeo n e ac h a n d e ver y Sp o r lan TEV.A standard superheat set t inghas been es tabl ished for everys ize and every the rmos ta t i c

cha rge . This stand ar d se tting pr ovides the p ro per supe r -

heat on the average system to which the par t icular TEVsize a nd ch ar ge is like ly to be ap plied .

Ther efor e , in m os t cases , a sup erh eat ad jus tm ent on thejo b will n o t b e n ecessa r y. Sp o r la n r eco m m en d s a ch an gein the sup erh eat ad jus tm ent o n l y after it ha s bee n d eter-

mined that i t is required. A careful measurement of theop era t ing super hea t, u s ing the r eco m m ende d p r oced ur e ,will estab lish if a c h an ge wo uld b e b en eficial .

Should a Sporlanthermostatic

expansion

valve (TEV) be adjustedafter installation?

52F

CONVERTE

DTO

TEMP

.OBTAIN SUCTION PRESSURE . . . 69PSIG

(at bulb)

52

40

12SUPERHEAT

Temperaturehere reads

EXAMPLE: REFRIGERANT-22

WHATS YOUR SUPERHEAT ?

To r ed u ce t h e s u p e r h ea t , t u r n t h e ad ju s t i n g s t emCOUNTER-CLOCKWISE. To increase the superheat, turn

the ad justin g stem CLOCKWISE. Wh en ad jus tin g the valve,


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make no more than one turn of the s tem a t at ime and observe the change in superheatclose ly to pr even t o ver-sho o ting th e d esire d se t-ting. On adjustable TEVs, Sporlan attempts top o sitio n the ad ju stin g stem at th e h alf-way p o intwhen it is at the standard setting. This allows

m axim um adjustm ent in bo th d irec t ion s .

Spo rlan sup plies a n um be r o f OEMs with n o n -adjustable TEVs. The OEM determines thesup er he at set ting thr ou gh lab or ator y tes ting of the unit . Some of these valves can be convert-ed in the f ie ld to adjus table models , but thisshould not be a t tempted wi thout the approvalof the OEM involved.

SPORLANTYPE S

SPORLANTYPE BI

Adjustable

Superheat

Non-adjustable

Superheat


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One of the advantages of ther-mostatic expansion valve (TEV)co n tro l is tha t the valve m o ves tothe closed posi t ion quickly them o m e n t t h e c o m p r e s s o r i s

cycled off . This feature isim po r tan t beca use it stop s the liqu id flow into the e vap o-rator so that i t does not f i l l with refrigerant during theoff-cycle . When the compressor res tar ts , i t must s tar tagains t a pr essur e d iffer en ce s ince the h igh an d low s ide so f the system h ave b ee n isolated b y the clo sing o f the TEV.

This type system employs either a capacitor-start /capac-i tor - run (CSR) or three-phase compressor motor , bo thof which ha ve high s tar ting tor qu e ch ar acter is tics .

However, on certain types of air conditioning systems,equal izat ion of the high and low s ide pressures isre qu ire d whe n the co m pr essor is id le . They m us t have al imited refr igerant charge and no l iquid receiver toprevent excess refr igerant f rom accumulat ing in theevaporator.

These are sm aller sys tem s us ing s ingle p hase per m ane nt-spl i t -capaci tor (PSC) motors which have low s tar t ingtorque characteris t ics . They will not s tart unless the highand low s ide pr essures ar e n ear ly equ alized .

TEVs with pe rm an en t bleed s ar e so m etim es u sed to sat-isfy th is ap p licatio n, b u t th ey ca n b e slow to e q u alize a n dthey fail to control at low loads if the bleed is not s izedcarefully.

Sporlan developed a TEV with a RAPID PRESSURE BAL-

ANCE (RPB) feature which has proven ideal for theseapp lica tion s . The b leed po r t is la r ge eno ugh to pr od ucea r ap id p res su re b a lance , bu t r em ains c losed d ur ing nor -m al op era t ion .

The following figures illustrate the construction and opera-

tio n of a Sp or lan TEV eq u ipp ed with the RPB fea tur e.

What is RPB?


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FigureA i l lustrates the f low path ofref r igerant dur ing normal opera t ion .The flow is the sam e a s with other ba s icSporlan TEVs. The refrigerant passingthrough the por t and the amount of opening are determined by the posit ionof the pin in re lation to the p or t op en ing.

Figure B shows the pin clos ing them ain p or t. Th is occur s when the co m -pressor cycles off . As the pin movesm or e firm ly into the po r t, in the clos ing

direct ion, i t causes the s leeve to move upward, making a sec-on dar y or b leed p or t op en . The o pen ing of the b leed po r t a llowsrefr igerant to f low and equal ize high and low-side pressures . Inthe no rm al oper a ting po s ition the b leed p or t is he ld c losed by thesm all sp r in g abo ve the sleeve.

Rem em b er, as with a n y system u sing a cap illar y tub e, fixed r estric-tion or pe r m an en t bleed TEV, the system ch ar ge sho uld b e l im it-ed with no r eceiver. In a n y ap p lica tio n u sing a TEV with an RPB, itis recom m ended that a hard-s tar t com pr essor not be used u nlessit is eq uipp ed with a r e-star t tim e d elay o f at lea st two m inu tes.

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BleedPortOpen

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MainPort

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BleedPort

Closed

TYPICAL VALVE CROSS SECTION

FigureB

FigureA


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Sporlan Valve Company

tips rapidos de sporlan.pdf

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