Page 119 - ParkerBrassCatalog2010

Parker Hannifn Corporation
Parker Brass Products Division
Otsego, Michigan
C15
C
Catalog 3501E Metric Slow Start Flow Control Valves
Prestostart
Pneumatic slow start fttings
Principle
Designed for mounting on either the FRL or
power valve, Parker Prestostart slow start
function fttings permit the gradual increase
in pressure to a section of the pneumatic
system. This prevents shocks to the system
that may occur when full system pressure is
introduced thus reducing wear and potential
damage to components.
PIV Series
• Mounted on outlet port of FRL to control
downstream installation.
• Initial fow through the bolt is controlled by a
restrictor and adjustable needle valve.
• When 2/3 of the system pressure is
achieved the spring is compressed allowing
immediate increase to full system pressure.
• When the system is pressurized after an
emergency stop all cylinders will return to
the rest position.
PCV Series
• Mounted on the supply port of the
power valve or on the common supply of
associated power valves.
• Initial fow into the power valve is controlled
by the needle valve assembly.
• When 2/3 of the system pressure is
achieved the spring is compressed allowing
immediate increase to full system pressure.
• When the system is pressurized after an
emergency stop all cylinders will return to
the rest position.
Pressurization speed
Adjustment of the needle valve to regulate the
air fow controls the time taken to pressurize
the system.
Adjustment
• Use a spanner to prevent the bolt assembly
turning.
• Use an Allen key to adjust the needle valve.
Maximum torque 1N/m.
Allen Key adjustment
Gold identification washer
Slow start regulator
Spring
Adjustable needle
Valve
To
cylinder
FRL
PIV Series
page 9 dessin 1
Adjustment by Allen Key
Black identification washer
Pressure speed regulator
Spring
Adjustable needle
Valve
From
FRL
From
FRL
Power valve
PCV Series
page 9 dessin 2
Adjustable
time
P
Supply
pressure
Full Flow
with slow-starter
courbe page 9
time
System
Isolating
Valve
Power
Valve
Spanner
page 9 dessin 3
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YLBMESSA
LAIRETAM
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DAERHT
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.PMET
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NOISREV
DAERHT
NOISREV
hgiH
ecnatsiseR
edimayloP
lekciNssarB
detalP
lekciNssarB
detalP
PPSB4/1
PPSB8/3
PPSB2/1
nolyN
rehsaW
mm21ot8
nI-hsuP
2/1ot4/1
PPSB
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daerhT
0morF° ot
041+°F
ISP001
Technical features