Page 112 - ParkerBrassCatalog2010

Parker Hannifn Corporation
Parker Brass Products Division
Otsego, Michigan
C8
C
Flow regulation on the
exhaust port
Prestofow - Flow regulators
Parker offers a wide range of fow regulators to meet a large variety
of applications. Prestofow can be ftted directly to a cylinder port or
mounted in the line. Prestofow regulators with push-in terminations
are suitable for use with a wide range of plastic tubing. Prestofow
regulators with threaded terminations can be adapted for use with
copper and steel tubing or hoses.
Metric Right Angle Flow Control Valves
Flow control on a
double acting cylinder
Inlet
chamber
Outlet
chamber
Inlet Exhaust
Inlet
chamber
Outlet
chamber
Inlet Exhaust
General principle
The piston rod moves as a result of
the pressure differential on either
side of the piston. The speed of the
rod is normally determined by the
exhaust air fow from the cylinder.
The control of this air fow is via an
adjustable needle valve installed on
the exhaust port.
On single acting cylinders and
some miniature (M5) double acting
cylinders, the air fow can be
controlled from the inlet port.
To permit regular and smooth
movement of the piston rod, fow
control should be made as near to
the cylinder as possible.
Operation
The mounting of two fow control
devices on a cylinder permits speed
control of the cylinder rod in both
directions.
The sketch opposite shows a
cylinder with inlet air at port A.
Air passes freely through the fow
control valve A, with the check valve
in the open position. The exhaust
is controlled by the fow control
ftting B, where the check valve in
the closed position forces the air to
go through the adjustable needle
valve. The function of A and B are
reversed when inlet air is applied
to port B.
Flow characteristics
Prestofow pneumatic integrated fttings are designed to permit
maximum fow in both directions. This full fow in both directions,
together with the very precise setting of the screw, permits a wide
range of adjustment between the minimum and maximum speeds.
The sketch opposite shows the fow progression according to the
adjustment of the screw.
Flow regulators -
assembly torques
To ensure a leak free
connection for port mounted
regulators the regulator
bolt should be tightened in
accordance with the table
opposite.
Flow regulation on
the inlet port
Adjustment turns
Flow
Inlet
Outlet
20% 40% 60% 80% 100%
EUqROTYLBMESSA
DAERHT MN.NIM MN.XAM
5M
8/1
4/1
8/3
2/1
2.0
6
01
41
03
5.0
9
51
22
24