Grasso GRASSOSCREW GSL Series, Инструкция по эксплуатации

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h) lnstall the SCfews around the circumlerence of the ou1•
let cover and t1ghten to the torque lor Grade 8, Cond i •
tion b bolts in !able 7 .1 in paragraph 7.4.
i) Make sure the new bolt seals are used under the heao of
the screws which are mounted through the discharge
port of the oulle1 cover.
j)
lnstaJI a new O-ring on the 011 Süpply tube
k) lnsert the oil supply tube into the compressor.
f) lnstall a new O-ring in the square cap.
m) lnstall the square
cap
with the
four
Ferry head screws
n)
lnstall the oil supply
hne
to the square cap.
o) Prepare the shah seal pans and snatt as 1n para. 7.5.
p) lnstall the shaft sea! as tn paragraph 7.5.
q) lnstalt the dîschasge pressure conirol tub,ng in the out•
let cover
r) lnstall the discharge p1pe w1th new flange gasket�
s) lnstall the d1scharge temperature thermostat bulb in
the d1scharge pipe.
t) lnstall the coupling as 1n paragraph 4.6 lnstall the coup•
hng guaro
U) Close the pressure safety vaJve.
v) Open the suct,on stop valve and the d1scharge stop
valve.
w)
lf the
compressor
1s fitted
w1th
an
economlzer port,
open the economizer stop valve.
x) Reconnect the control cabinet to the etectnc supply
hne.
y) Reconnect the starter to the electric supply hna
GRBSSa
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,"51'JfJC:11011 ___ _
7.11 CAPACITY CONTROL VALVE GUIDES
INSPECTION (refer to fig. 7.9)
The capacity control valve IS posittoned and kepl from rotat­
ing and therefore touching the rotors
by
a capac1ty control
valve gu1de This rs a separate valve guioe mounted loose
on the end of the stator and has two machined shoes sup­
poning each U;)?E!rsioe of the valve. The piston also assists
in pos-itloning the sflde vaJve. The bare through which the
p1s1on 1s moving 1s machmed to very close clearance and
therefore prevents the valve from moving vertically upwards
into the rotor.
A) INSPECTION
a)
Carry
out tne shu1down procedure 1n paragraph 7 .3
b) Place the capacity control val\/e in the ma.x,mum pos,­
tion by rotatlng the output shatt clocl(wÎse Th1s pre­
ventr. th� capacity oontrol valvc trom be1n9 knocked
when lhe outlet end cover is removed
c) Remove the coupling. p•plng, shatt seal and oullel end
cover as 1n paragraph 7 .10.
d) Return the capacïty conttoi valve to the minimum or
fully unloaded posillon by rotat1ng the ourput shafl
counterclockw1se. ThJS moves the capac1ty control
shde valve out from vndemeath the rotors tor v1sual in­
spection
e) Examme the capacrty control shde valve tor wear and
contact marl<s from the rotor. lf there has been any
contact between the rotors and
the
valve
it
wiH appear
as contact mar1<s on either or both of the top surf aces
of the vaJve. lf there are
any
contact marks on the
valve the valve gurdes (4) wdl have to be readjusted.
f) Check the dearance between the vaive guide and the ca­
pacity con trol vaJve. lnser1 equal thîcknesses of feeler
CAPACITY CONTROL VAL VE GUIDES
FIG. 7.8 CAPACITY CONTROL VALVE GULDE
92.01
Compressor Package GSLP
Page7.9